def topology_four_child_tree(network_cache=0.05, n_contents=100000, seed=None):
"""
Returns a tree topology
Parameters
----------
network_cache : float
Size of network cache (sum of all caches) normalized by size of content
population
n_contents : int
Size of content population
seed : int, optional
The seed used for random number generation
Returns
-------
topology : fnss.Topology
The topology object
"""
h = 5 # depth of the tree
topology = fnss.k_ary_tree_topology(4, h)
topology.add_node(1365, depth=-1)
topology.add_path([0, 1365])
receivers = [
v for v in topology.nodes_iter() if topology.node[v]['depth'] == h
]
sources = [
v for v in topology.nodes_iter() if topology.node[v]['depth'] == -1
]
caches = [
v for v in topology.nodes_iter()
if topology.node[v]['depth'] >= 0 and topology.node[v]['depth'] < h
]
# randomly allocate contents to sources
content_placement = uniform_content_placement(topology,
range(1, n_contents + 1),
sources,
seed=seed)
for v in sources:
fnss.add_stack(topology, v, 'source',
{'contents': content_placement[v]})
for v in receivers:
fnss.add_stack(topology, v, 'receiver', {})
cache_placement = uniform_cache_placement(topology,
network_cache * n_contents,
caches)
for node, size in cache_placement.iteritems():
fnss.add_stack(topology, node, 'cache', {'size': size})
# set weights and delays on all links
fnss.set_weights_constant(topology, 1.0)
fnss.set_delays_constant(topology, INTERNAL_LINK_DELAY, 'ms')
# label links as internal or external
for u, v in topology.edges_iter():
if u in sources or v in sources:
topology.edge[u][v]['type'] = 'external'
fnss.set_delays_constant(topology, EXTERNAL_LINK_DELAY, 'ms',
[(u, v)])
else:
topology.edge[u][v]['type'] = 'internal'
return topology
def topology_path(n, delay=1, **kwargs):
"""Return a path topology with a receiver on node `0` and a source at node
'n-1'
Parameters
----------
n : int (>=3)
The number of nodes
delay : float
The link delay in milliseconds
Returns
-------
topology : IcnTopology
The topology object
"""
topology = fnss.line_topology(n)
receivers = [0]
routers = range(1, n - 1)
sources = [n - 1]
topology.graph['icr_candidates'] = set(routers)
for v in sources:
fnss.add_stack(topology, v, 'source')
for v in receivers:
fnss.add_stack(topology, v, 'receiver')
for v in routers:
fnss.add_stack(topology, v, 'router')
# set weights and delays on all links
fnss.set_weights_constant(topology, 1.0)
fnss.set_delays_constant(topology, delay, 'ms')
# label links as internal or external
for u, v in topology.edges_iter():
topology.edge[u][v]['type'] = 'internal'
return IcnTopology(topology)
def test_p_median_unsorted(self):
"""
Test topology:
A ---- C ---- B ----[HIGH DIST] --- E --- D --- F
Expected facilities: 1, 4
"""
t = fnss.Topology()
nx.add_path(t, "ACBEDF")
fnss.set_weights_constant(t, 1)
fnss.set_weights_constant(t, 2, [("B", "E")])
distances = dict(nx.all_pairs_dijkstra_path_length(t, weight='weight'))
allocation, facilities, cost = algorithms.compute_p_median(
distances, 2)
assert {
"A": "C",
"B": "C",
"C": "C",
"D": "D",
"E": "D",
"F": "D",
} == allocation
assert set("CD") == facilities
assert 4 == cost
def test_p_median(self):
"""
Test topology:
A ---- B ---- C ----[HIGH DIST] --- D --- E --- F
Expected facilities: 1, 4
"""
t = fnss.Topology()
nx.add_path(t, "ABCDEF")
fnss.set_weights_constant(t, 1)
fnss.set_weights_constant(t, 2, [("C", "D")])
distances = dict(nx.all_pairs_dijkstra_path_length(t, weight='weight'))
allocation, facilities, cost = algorithms.compute_p_median(
distances, 2)
self.assertDictEqual(
{
"A": "B",
"B": "B",
"C": "B",
"D": "E",
"E": "E",
"F": "E",
}, allocation)
self.assertSetEqual(set("BE"), facilities)
self.assertEqual(4, cost)
def topology_path(n, delay=1, **kwargs):
"""Return a path topology with a receiver on node `0` and a source at node
'n-1'
Parameters
----------
n : int (>=3)
The number of nodes
delay : float
The link delay in milliseconds
Returns
-------
topology : IcnTopology
The topology object
"""
topology = fnss.line_topology(n)
receivers = [0]
routers = range(1, n-1)
sources = [n-1]
topology.graph['icr_candidates'] = set(routers)
for v in sources:
fnss.add_stack(topology, v, 'source')
for v in receivers:
fnss.add_stack(topology, v, 'receiver')
for v in routers:
fnss.add_stack(topology, v, 'router')
# set weights and delays on all links
fnss.set_weights_constant(topology, 1.0)
fnss.set_delays_constant(topology, delay, 'ms')
# label links as internal or external
for u, v in topology.edges_iter():
topology.edge[u][v]['type'] = 'internal'
return IcnTopology(topology)
def topology_garr2(**kwargs):
"""Return a scenario based on GARR topology.
Differently from plain GARR, this topology some receivers are appended to
routers and only a subset of routers which are actually on the path of some
traffic are selected to become ICN routers. These changes make this
topology more realistic.
Parameters
----------
seed : int, optional
The seed used for random number generation
Returns
-------
topology : fnss.Topology
The topology object
"""
topology = fnss.parse_topology_zoo(
path.join(TOPOLOGY_RESOURCES_DIR,
'Garr201201.graphml')).to_undirected()
# sources are nodes representing neighbouring AS's
sources = [0, 2, 3, 5, 13, 16, 23, 24, 25, 27, 51, 52, 54]
# receivers are internal nodes with degree = 1
receivers = [
1, 7, 8, 9, 11, 12, 19, 26, 28, 30, 32, 33, 41, 42, 43, 47, 48, 50, 53,
57, 60
]
# routers are all remaining nodes --> 27 caches
routers = [
n for n in topology.nodes_iter() if n not in receivers + sources
]
artificial_receivers = list(range(1000, 1000 + len(routers)))
for i in range(len(routers)):
topology.add_edge(routers[i], artificial_receivers[i])
receivers += artificial_receivers
# Caches to nodes with degree > 3 (after adding artificial receivers)
degree = nx.degree(topology)
icr_candidates = [n for n in topology.nodes_iter() if degree[n] > 3.5]
# set weights and delays on all links
fnss.set_weights_constant(topology, 1.0)
fnss.set_delays_constant(topology, INTERNAL_LINK_DELAY, 'ms')
# Deploy stacks
topology.graph['icr_candidates'] = set(icr_candidates)
for v in sources:
fnss.add_stack(topology, v, 'source')
for v in receivers:
fnss.add_stack(topology, v, 'receiver')
for v in routers:
fnss.add_stack(topology, v, 'router')
# label links as internal or external
for u, v in topology.edges():
if u in sources or v in sources:
topology.edge[u][v]['type'] = 'external'
# this prevents sources to be used to route traffic
fnss.set_weights_constant(topology, 1000.0, [(u, v)])
fnss.set_delays_constant(topology, EXTERNAL_LINK_DELAY, 'ms',
[(u, v)])
else:
topology.edge[u][v]['type'] = 'internal'
return IcnTopology(topology)
def topology_fiveNode(**kwargs):
"""Return a scenario based on Five_Node topology.
This functions the similar as the GEANT topology but with only 5 nodes
All routers are given caches
Sources are added on initilization in addition to the main network to all
nodes with 2 connections
Parameters
----------
seed : int, optional
The seed used for random number generation
Returns
-------
topology : fnss.Topology
The topology object
"""
# 5 nodes
topology = fnss.parse_topology_zoo(
path.join(TOPOLOGY_RESOURCES_DIR, 'SixNode.graphml')).to_undirected()
topology = list(nx.connected_component_subgraphs(topology))[0]
deg = nx.degree(topology)
receivers = [v for v in topology.nodes() if deg[v] == 1] # 8 nodes
# attach sources to topology
source_attachments = [v for v in topology.nodes()
if deg[v] == 2] # 13 nodes
sources = []
for v in source_attachments:
u = v + 1000 # node ID of source
topology.add_edge(v, u)
sources.append(u)
routers = [v for v in topology.nodes() if v not in sources + receivers]
# Put caches in nodes with top betweenness centralities
betw = nx.betweenness_centrality(topology)
routers = sorted(routers, key=lambda k: betw[k])
# Select as ICR candidates all routers
icr_candidates = routers
# add stacks to nodes
topology.graph['icr_candidates'] = set(icr_candidates)
for v in sources:
fnss.add_stack(topology, v, 'source')
for v in receivers:
fnss.add_stack(topology, v, 'receiver')
for v in routers:
fnss.add_stack(topology, v, 'router')
# set weights and delays on all links
fnss.set_weights_constant(topology, 1.0)
fnss.set_delays_constant(topology, INTERNAL_LINK_DELAY, 'ms')
# label links as internal or external
for u, v in topology.edges_iter():
if u in sources or v in sources:
topology.edge[u][v]['type'] = 'external'
# this prevents sources to be used to route traffic
fnss.set_weights_constant(topology, 1000.0, [(u, v)])
fnss.set_delays_constant(topology, EXTERNAL_LINK_DELAY, 'ms',
[(u, v)])
else:
topology.edge[u][v]['type'] = 'internal'
return IcnTopology(topology)
def topology_geant2(**kwargs):
"""Return a scenario based on GEANT topology.
Differently from plain GEANT, this topology some receivers are appended to
routers and only a subset of routers which are actually on the path of some
traffic are selected to become ICN routers. These changes make this
topology more realistic.
Parameters
----------
seed : int, optional
The seed used for random number generation
Returns
-------
topology : fnss.Topology
The topology object
"""
# 53 nodes
topology = fnss.parse_topology_zoo(path.join(TOPOLOGY_RESOURCES_DIR,
'Geant2012.graphml')
).to_undirected()
topology = list(nx.connected_component_subgraphs(topology))[0]
deg = nx.degree(topology)
receivers = [v for v in topology.nodes() if deg[v] == 1] # 8 nodes
# attach sources to topology
source_attachments = [v for v in topology.nodes() if deg[v] == 2] # 13 nodes
sources = []
for v in source_attachments:
u = v + 1000 # node ID of source
topology.add_edge(v, u)
sources.append(u)
routers = [v for v in topology.nodes() if v not in sources + receivers]
# Put caches in nodes with top betweenness centralities
betw = nx.betweenness_centrality(topology)
routers = sorted(routers, key=lambda k: betw[k])
# Select as ICR candidates the top 50% routers for betweenness centrality
icr_candidates = routers[len(routers) // 2:]
# add stacks to nodes
topology.graph['icr_candidates'] = set(icr_candidates)
for v in sources:
fnss.add_stack(topology, v, 'source')
for v in receivers:
fnss.add_stack(topology, v, 'receiver')
for v in routers:
fnss.add_stack(topology, v, 'router')
# set weights and delays on all links
fnss.set_weights_constant(topology, 1.0)
fnss.set_delays_constant(topology, INTERNAL_LINK_DELAY, 'ms')
# label links as internal or external
for u, v in topology.edges_iter():
if u in sources or v in sources:
topology.edge[u][v]['type'] = 'external'
# this prevents sources to be used to route traffic
fnss.set_weights_constant(topology, 1000.0, [(u, v)])
fnss.set_delays_constant(topology, EXTERNAL_LINK_DELAY, 'ms', [(u, v)])
else:
topology.edge[u][v]['type'] = 'internal'
return IcnTopology(topology)
def topology_ds2os(**kwargs):
# pass edge list to create topology (alternatively pass NetworkX object)
agents = ['agent' + str(id)
for id in range(1, 7)] # [agent1, agent2, ..., agent6]
edges = [
# main edges between KAs/rooms
('agent1', 'agent2'), # BedroomChildren, BedroomParents
('agent2', 'agent6'), # BedroomParents, Bathroom
('agent2', 'agent4'), # BedroomParents, Kitchen
# ('agent3', 'agent6'), # Dinningroom, Bathroom
('agent4', 'agent5'), # Kitchen, Garage
('agent4', 'agent3'), # Kitchen, Dinningroom
]
rooms = [
['movement1', 'questioningservice1', 'tempin1',
'lightcontrol1'], # ka1, BedroomChildren
['movement2', 'questioningservice2', 'tempin2',
'lightcontrol2'], # ka2, BedroomParents
[
'heatingcontrol1', 'doorlock1', 'questioningservice3', 'movement3',
'tempin3', 'lightcontrol3'
], # ka3, Dinningroom
['tempin4', 'lightcontrol4', 'movement4', 'battery3'], # ka4, Kitchen
['tempin5', 'battery1', 'movement5', 'lightcontrol5',
'battery2'], # ka5, Garage
['tempin6', 'washingmachine1', 'lightcontrol6',
'movement6'], # ka6, Bathroom
]
for i, agent in enumerate(agents):
connectedServices = rooms[i]
# print(agent, 'is connected to', connectedServices)
for service in connectedServices:
edges.append((agent, service)) # e.g. ('agent1', 'movement1')
if not service.startswith('questioningservice'
): # questioningservices only read data
edges.append(
(service, service +
'/source')) # e.g. ('movement1', 'movement1/source')
edges.append(
(service, service +
'/receiver')) # e.g. ('movement1', 'movement1/receiver')
topology = fnss.Topology(data=edges)
for node in topology.nodes():
stack = 'source' if node.endswith('source') else (
'receiver' if node.endswith('receiver') else 'router')
fnss.add_stack(topology, node, stack)
topology.graph['icr_candidates'] = set(agents) # only cache at agents
fnss.set_weights_constant(topology, 1.0)
fnss.set_delays_constant(topology, INTERNAL_LINK_DELAY, 'ms')
return IcnTopology(topology)
def topology_fiveNode(**kwargs):
"""Return a scenario based on Five_Node topology.
This functions the similar as the GEANT topology but with only 5 nodes
All routers are given caches
Sources are added on initilization in addition to the main network to all
nodes with 2 connections
Parameters
----------
seed : int, optional
The seed used for random number generation
Returns
-------
topology : fnss.Topology
The topology object
"""
# 5 nodes
topology = fnss.parse_topology_zoo(path.join(TOPOLOGY_RESOURCES_DIR,
'SixNode.graphml')
).to_undirected()
topology = list(nx.connected_component_subgraphs(topology))[0]
deg = nx.degree(topology)
receivers = [v for v in topology.nodes() if deg[v] == 1] # 8 nodes
# attach sources to topology
source_attachments = [v for v in topology.nodes() if deg[v] == 2] # 13 nodes
sources = []
for v in source_attachments:
u = v + 1000 # node ID of source
topology.add_edge(v, u)
sources.append(u)
routers = [v for v in topology.nodes() if v not in sources + receivers]
# Put caches in nodes with top betweenness centralities
betw = nx.betweenness_centrality(topology)
routers = sorted(routers, key=lambda k: betw[k])
# Select as ICR candidates all routers
icr_candidates = routers
# add stacks to nodes
topology.graph['icr_candidates'] = set(icr_candidates)
for v in sources:
fnss.add_stack(topology, v, 'source')
for v in receivers:
fnss.add_stack(topology, v, 'receiver')
for v in routers:
fnss.add_stack(topology, v, 'router')
# set weights and delays on all links
fnss.set_weights_constant(topology, 1.0)
fnss.set_delays_constant(topology, INTERNAL_LINK_DELAY, 'ms')
# label links as internal or external
for u, v in topology.edges_iter():
if u in sources or v in sources:
topology.edge[u][v]['type'] = 'external'
# this prevents sources to be used to route traffic
fnss.set_weights_constant(topology, 1000.0, [(u, v)])
fnss.set_delays_constant(topology, EXTERNAL_LINK_DELAY, 'ms', [(u, v)])
else:
topology.edge[u][v]['type'] = 'internal'
return IcnTopology(topology)
def topology_geant2(**kwargs):
"""Return a scenario based on GEANT topology.
Differently from plain GEANT, this topology some receivers are appended to
routers and only a subset of routers which are actually on the path of some
traffic are selected to become ICN routers. These changes make this
topology more realistic.
Parameters
----------
seed : int, optional
The seed used for random number generation
Returns
-------
topology : fnss.Topology
The topology object
"""
# 53 nodes
topology = fnss.parse_topology_zoo(path.join(TOPOLOGY_RESOURCES_DIR,
'Geant2012.graphml')
).to_undirected()
topology = list(nx.connected_component_subgraphs(topology))[0]
deg = nx.degree(topology)
receivers = [v for v in topology.nodes() if deg[v] == 1] # 8 nodes
# attach sources to topology
source_attachments = [v for v in topology.nodes() if deg[v] == 2] # 13 nodes
sources = []
for v in source_attachments:
u = v + 1000 # node ID of source
topology.add_edge(v, u)
sources.append(u)
routers = [v for v in topology.nodes() if v not in sources + receivers]
# Put caches in nodes with top betweenness centralities
betw = nx.betweenness_centrality(topology)
routers = sorted(routers, key=lambda k: betw[k])
# Select as ICR candidates the top 50% routers for betweenness centrality
icr_candidates = routers[len(routers)//2:]
# add stacks to nodes
topology.graph['icr_candidates'] = set(icr_candidates)
for v in sources:
fnss.add_stack(topology, v, 'source')
for v in receivers:
fnss.add_stack(topology, v, 'receiver')
for v in routers:
fnss.add_stack(topology, v, 'router')
# set weights and delays on all links
fnss.set_weights_constant(topology, 1.0)
fnss.set_delays_constant(topology, INTERNAL_LINK_DELAY, 'ms')
# label links as internal or external
for u, v in topology.edges_iter():
if u in sources or v in sources:
topology.edge[u][v]['type'] = 'external'
# this prevents sources to be used to route traffic
fnss.set_weights_constant(topology, 1000.0, [(u, v)])
fnss.set_delays_constant(topology, EXTERNAL_LINK_DELAY, 'ms', [(u, v)])
else:
topology.edge[u][v]['type'] = 'internal'
return IcnTopology(topology)
def test_clear_weights(self):
# create new topology to avoid parameters pollution
G = fnss.star_topology(12)
fnss.set_weights_constant(G, 3, None)
self.assertEqual(G.number_of_edges(),
len(nx.get_edge_attributes(G, 'weight')))
fnss.clear_weights(G)
self.assertEqual(0, len(nx.get_edge_attributes(G, 'weight')))
def test_clear_weights(self):
# create new topology to avoid parameters pollution
G = fnss.star_topology(12)
fnss.set_weights_constant(G, 3, None)
self.assertEqual(G.number_of_edges(),
len(nx.get_edge_attributes(G, 'weight')))
fnss.clear_weights(G)
self.assertEqual(0, len(nx.get_edge_attributes(G, 'weight')))
def generate_topo(n):
topo = nx.powerlaw_cluster_graph(n,2,0.08)
# topo = fnss.waxman_1_topology(n=50,alpha=0.6,beta=0.3)
# topo = fnss.fat_tree_topology(n)
fnss.set_weights_constant(topo,1)
fnss.set_delays_constant(topo, 1, 'ms')
fnss.set_capacities_edge_betweenness(topo,[100,500,1000],'Mbps')
fnss.write_topology(topo,'topo_pl_50.xml')
def topology_wide(network_cache=0.05, n_contents=100000, seed=None):
"""
Return a scenario based on GARR topology
Parameters
----------
network_cache : float
Size of network cache (sum of all caches) normalized by size of content
population
n_contents : int
Size of content population
seed : int, optional
The seed used for random number generation
Returns
-------
topology : fnss.Topology
The topology object
"""
topology = fnss.parse_topology_zoo(
path.join(TOPOLOGY_RESOURCES_DIR, 'WideJpn.graphml')).to_undirected()
# sources are nodes representing neighbouring AS's
sources = [9, 8, 11, 13, 12, 15, 14, 17, 16, 19, 18]
# receivers are internal nodes with degree = 1
receivers = [27, 28, 3, 5, 4, 7]
# caches are all remaining nodes --> 27 caches
caches = [n for n in topology.nodes() if n not in receivers + sources]
# set weights and delays on all links
fnss.set_weights_constant(topology, 1.0)
fnss.set_delays_constant(topology, INTERNAL_LINK_DELAY, 'ms')
# randomly allocate contents to sources
content_placement = uniform_content_placement(topology,
range(1, n_contents + 1),
sources,
seed=seed)
for v in sources:
fnss.add_stack(topology, v, 'source',
{'contents': content_placement[v]})
for v in receivers:
fnss.add_stack(topology, v, 'receiver', {})
# label links as internal or external
for u, v in topology.edges():
if u in sources or v in sources:
topology.edge[u][v]['type'] = 'external'
# this prevents sources to be used to route traffic
fnss.set_weights_constant(topology, 1000.0, [(u, v)])
fnss.set_delays_constant(topology, EXTERNAL_LINK_DELAY, 'ms',
[(u, v)])
else:
topology.edge[u][v]['type'] = 'internal'
cache_placement = uniform_cache_placement(topology,
network_cache * n_contents,
caches)
for node, size in cache_placement.iteritems():
fnss.add_stack(topology, node, 'cache', {'size': size})
return topology
def topology_garr2(**kwargs):
"""Return a scenario based on GARR topology.
Differently from plain GARR, this topology some receivers are appended to
routers and only a subset of routers which are actually on the path of some
traffic are selected to become ICN routers. These changes make this
topology more realistic.
Parameters
----------
seed : int, optional
The seed used for random number generation
Returns
-------
topology : fnss.Topology
The topology object
"""
topology = fnss.parse_topology_zoo(path.join(TOPOLOGY_RESOURCES_DIR, 'Garr201201.graphml')).to_undirected()
# sources are nodes representing neighbouring AS's
sources = [0, 2, 3, 5, 13, 16, 23, 24, 25, 27, 51, 52, 54]
# receivers are internal nodes with degree = 1
receivers = [1, 7, 8, 9, 11, 12, 19, 26, 28, 30, 32, 33, 41, 42, 43, 47, 48, 50, 53, 57, 60]
# routers are all remaining nodes --> 27 caches
routers = [n for n in topology.nodes_iter() if n not in receivers + sources]
artificial_receivers = list(range(1000, 1000 + len(routers)))
for i in range(len(routers)):
topology.add_edge(routers[i], artificial_receivers[i])
receivers += artificial_receivers
# Caches to nodes with degree > 3 (after adding artificial receivers)
degree = nx.degree(topology)
icr_candidates = [n for n in topology.nodes_iter() if degree[n] > 3.5]
# set weights and delays on all links
fnss.set_weights_constant(topology, 1.0)
fnss.set_delays_constant(topology, INTERNAL_LINK_DELAY, 'ms')
# Deploy stacks
topology.graph['icr_candidates'] = set(icr_candidates)
for v in sources:
fnss.add_stack(topology, v, 'source')
for v in receivers:
fnss.add_stack(topology, v, 'receiver')
for v in routers:
fnss.add_stack(topology, v, 'router')
# label links as internal or external
for u, v in topology.edges():
if u in sources or v in sources:
topology.edge[u][v]['type'] = 'external'
# this prevents sources to be used to route traffic
fnss.set_weights_constant(topology, 1000.0, [(u, v)])
fnss.set_delays_constant(topology, EXTERNAL_LINK_DELAY, 'ms',[(u, v)])
else:
topology.edge[u][v]['type'] = 'internal'
return IcnTopology(topology)
def topology_geant(**kwargs):
"""Return a scenario based on GEANT topology
Parameters
----------
seed : int, optional
The seed used for random number generation
Returns
-------
topology : fnss.Topology
The topology object
"""
# 240 nodes in the main component
topology = fnss.parse_topology_zoo(
path.join(TOPOLOGY_RESOURCES_DIR,
'Geant2012.graphml')).to_undirected()
topology = list(nx.connected_component_subgraphs(topology))[0]
deg = nx.degree(topology)
receivers = [v for v in topology.nodes() if deg[v] == 1] # 8 nodes
icr_candidates = [v for v in topology.nodes() if deg[v] > 2] # 19 nodes
# attach sources to topology
source_attachments = [v for v in topology.nodes()
if deg[v] == 2] # 13 nodes
sources = []
for v in source_attachments:
u = v + 1000 # node ID of source
topology.add_edge(v, u)
sources.append(u)
routers = [v for v in topology.nodes() if v not in sources + receivers]
# add stacks to nodes
topology.graph['icr_candidates'] = set(icr_candidates)
for v in sources:
fnss.add_stack(topology, v, 'source')
for v in receivers:
fnss.add_stack(topology, v, 'receiver')
for v in routers:
fnss.add_stack(topology, v, 'router')
# set weights and delays on all links
fnss.set_weights_constant(topology, 1.0)
fnss.set_delays_constant(topology, INTERNAL_LINK_DELAY, 'ms')
# label links as internal or external
for u, v in topology.edges_iter():
if u in sources or v in sources:
topology.edge[u][v]['type'] = 'external'
# this prevents sources to be used to route traffic
fnss.set_weights_constant(topology, 1000.0, [(u, v)])
fnss.set_delays_constant(topology, EXTERNAL_LINK_DELAY, 'ms',
[(u, v)])
else:
topology.edge[u][v]['type'] = 'internal'
return IcnTopology(topology)
def topology_garr(network_cache=0.05, n_contents=100000, seed=None):
"""
Return a scenario based on GARR topology
Parameters
----------
network_cache : float
Size of network cache (sum of all caches) normalized by size of content
population
n_contents : int
Size of content population
seed : int, optional
The seed used for random number generation
Returns
-------
topology : fnss.Topology
The topology object
"""
topology = fnss.parse_topology_zoo(path.join(TOPOLOGY_RESOURCES_DIR, 'Garr201201.graphml')).to_undirected()
# sources are nodes representing neighbouring AS's
sources = [0, 2, 3, 5, 13, 16, 23, 24, 25, 27, 51, 52, 54]
# receivers are internal nodes with degree = 1
receivers = [1, 7, 8, 9, 11, 12, 19, 26, 28, 30, 32, 33, 41, 42, 43, 47, 48, 50, 53, 57, 60]
# caches are all remaining nodes --> 27 caches
caches = [n for n in topology.nodes() if n not in receivers + sources]
# set weights and delays on all links
fnss.set_weights_constant(topology, 1.0)
fnss.set_delays_constant(topology, INTERNAL_LINK_DELAY, 'ms')
# randomly allocate contents to sources
content_placement = uniform_content_placement(topology, range(1, n_contents+1),
sources, seed=seed)
for v in sources:
fnss.add_stack(topology, v, 'source', {'contents': content_placement[v]})
for v in receivers:
fnss.add_stack(topology, v, 'receiver', {})
# label links as internal or external
for u, v in topology.edges():
if u in sources or v in sources:
topology.edge[u][v]['type'] = 'external'
# this prevents sources to be used to route traffic
fnss.set_weights_constant(topology, 1000.0, [(u, v)])
fnss.set_delays_constant(topology, EXTERNAL_LINK_DELAY, 'ms',[(u, v)])
else:
topology.edge[u][v]['type'] = 'internal'
cache_placement = uniform_cache_placement(topology, network_cache*n_contents, caches)
for node, size in cache_placement.iteritems():
fnss.add_stack(topology, node, 'cache', {'size': size})
return topology
def topology_path(network_cache=0.05, n_contents=100000, n=3, seed=None):
"""
Return a scenario based on path topology
Parameters
----------
network_cache : float
Size of network cache (sum of all caches) normalized by size of content
population
n_contents : int
Size of content population
seed : int, optional
The seed used for random number generation
Returns
-------
topology : fnss.Topology
The topology object
"""
# 240 nodes in the main component
topology = fnss.line_topology(n)
receivers = [0]
caches = range(1, n - 1)
sources = [n - 1]
# randomly allocate contents to sources
content_placement = uniform_content_placement(topology,
range(1, n_contents + 1),
sources,
seed=seed)
for v in sources:
fnss.add_stack(topology, v, 'source',
{'contents': content_placement[v]})
for v in receivers:
fnss.add_stack(topology, v, 'receiver', {})
# set weights and delays on all links
fnss.set_weights_constant(topology, 1.0)
fnss.set_delays_constant(topology, INTERNAL_LINK_DELAY, 'ms')
# label links as internal or external
for u, v in topology.edges_iter():
if u in sources or v in sources:
topology.edge[u][v]['type'] = 'external'
fnss.set_delays_constant(topology, EXTERNAL_LINK_DELAY, 'ms',
[(u, v)])
else:
topology.edge[u][v]['type'] = 'internal'
cache_placement = uniform_cache_placement(topology,
network_cache * n_contents,
caches)
for node, size in cache_placement.iteritems():
fnss.add_stack(topology, node, 'cache', {'size': size})
return topology
def topology_garr(**kwargs):
"""Return a scenario based on GARR topology
Parameters
----------
seed : int, optional
The seed used for random number generation
Returns
-------
topology : fnss.Topology
The topology object
"""
topology = fnss.parse_topology_zoo(
path.join(TOPOLOGY_RESOURCES_DIR,
'Garr201201.graphml')).to_undirected()
# sources are nodes representing neighbouring AS's
sources = [0, 2, 3, 5, 13, 16, 23, 24, 25, 27, 51, 52, 54]
# receivers are internal nodes with degree = 1
receivers = [
1, 7, 8, 9, 11, 12, 19, 26, 28, 30, 32, 33, 41, 42, 43, 47, 48, 50, 53,
57, 60
]
# caches are all remaining nodes --> 27 caches
routers = [n for n in topology.nodes() if n not in receivers + sources]
icr_candidates = routers
# set weights and delays on all links
fnss.set_weights_constant(topology, 1.0)
fnss.set_delays_constant(topology, INTERNAL_LINK_DELAY, 'ms')
# Deploy stacks
topology.graph['icr_candidates'] = set(icr_candidates)
for v in sources:
fnss.add_stack(topology, v, 'source')
for v in receivers:
fnss.add_stack(topology, v, 'receiver')
for v in routers:
fnss.add_stack(topology, v, 'router')
# label links as internal or external
for u, v in topology.edges():
if u in sources or v in sources:
topology.edge[u][v]['type'] = 'external'
# this prevents sources to be used to route traffic
fnss.set_weights_constant(topology, 1000.0, [(u, v)])
fnss.set_delays_constant(topology, EXTERNAL_LINK_DELAY, 'ms',
[(u, v)])
else:
topology.edge[u][v]['type'] = 'internal'
return IcnTopology(topology)
def test_p_median_3(self):
# Test topology:
#
# A ---- C ---- B ----[HIGH DIST] --- E --- D --- F
#
# Expected facilities: 1, 4
t = fnss.Topology()
nx.add_path(t, "ACBEDF")
fnss.set_weights_constant(t, 1)
fnss.set_weights_constant(t, 2, [("B", "E")])
distances = dict(nx.all_pairs_dijkstra_path_length(t, weight='weight'))
allocation, facilities, cost = algorithms.compute_p_median(
distances, 3)
assert cost == 3
def parse(topo_path, xml_path, delay, buffer_type):
topology = fnss.parse_topology_zoo(topo_path)
topology = topology.to_undirected()
fnss.set_capacities_edge_betweenness(topology, [200, 500, 1000],
'Mbps') # TODO: hardcode now
fnss.set_weights_constant(topology, 1)
fnss.set_delays_constant(topology, delay, 'ms')
if buffer_type == 'bdp':
fnss.set_buffer_sizes_bw_delay_prod(topology, 'packet', 1500)
elif buffer_type == 'bw':
fnss.set_buffer_sizes_link_bandwidth(topology, buffer_unit='packet')
else:
fnss.set_buffer_sizes_constant(topology, 1500, 'packet')
fnss.write_topology(topology, xml_path)
def topology_four_child_tree(network_cache=0.05, n_contents=100000, seed=None):
"""
Returns a tree topology
Parameters
----------
network_cache : float
Size of network cache (sum of all caches) normalized by size of content
population
n_contents : int
Size of content population
seed : int, optional
The seed used for random number generation
Returns
-------
topology : fnss.Topology
The topology object
"""
h = 5 # depth of the tree
topology = fnss.k_ary_tree_topology(4, h)
topology.add_node(1365, depth=-1)
topology.add_path([0, 1365])
receivers = [v for v in topology.nodes_iter()
if topology.node[v]['depth'] == h]
sources = [v for v in topology.nodes_iter()
if topology.node[v]['depth'] == -1]
caches = [v for v in topology.nodes_iter()
if topology.node[v]['depth'] >= 0
and topology.node[v]['depth'] < h]
# randomly allocate contents to sources
content_placement = uniform_content_placement(topology, range(1, n_contents+1), sources, seed=seed)
for v in sources:
fnss.add_stack(topology, v, 'source', {'contents': content_placement[v]})
for v in receivers:
fnss.add_stack(topology, v, 'receiver', {})
cache_placement = uniform_cache_placement(topology, network_cache*n_contents, caches)
for node, size in cache_placement.iteritems():
fnss.add_stack(topology, node, 'cache', {'size': size})
# set weights and delays on all links
fnss.set_weights_constant(topology, 1.0)
fnss.set_delays_constant(topology, INTERNAL_LINK_DELAY, 'ms')
# label links as internal or external
for u, v in topology.edges_iter():
if u in sources or v in sources:
topology.edge[u][v]['type'] = 'external'
fnss.set_delays_constant(topology, EXTERNAL_LINK_DELAY, 'ms', [(u, v)])
else:
topology.edge[u][v]['type'] = 'internal'
return topology
def topology_geant(**kwargs):
"""Return a scenario based on GEANT topology
Parameters
----------
seed : int, optional
The seed used for random number generation
Returns
-------
topology : fnss.Topology
The topology object
"""
# 240 nodes in the main component
topology = fnss.parse_topology_zoo(path.join(TOPOLOGY_RESOURCES_DIR,
'Geant2012.graphml')
).to_undirected()
topology = list(nx.connected_component_subgraphs(topology))[0]
deg = nx.degree(topology)
receivers = [v for v in topology.nodes() if deg[v] == 1] # 8 nodes
icr_candidates = [v for v in topology.nodes() if deg[v] > 2] # 19 nodes
# attach sources to topology
source_attachments = [v for v in topology.nodes() if deg[v] == 2] # 13 nodes
sources = []
for v in source_attachments:
u = v + 1000 # node ID of source
topology.add_edge(v, u)
sources.append(u)
routers = [v for v in topology.nodes() if v not in sources + receivers]
# add stacks to nodes
topology.graph['icr_candidates'] = set(icr_candidates)
for v in sources:
fnss.add_stack(topology, v, 'source')
for v in receivers:
fnss.add_stack(topology, v, 'receiver')
for v in routers:
fnss.add_stack(topology, v, 'router')
# set weights and delays on all links
fnss.set_weights_constant(topology, 1.0)
fnss.set_delays_constant(topology, INTERNAL_LINK_DELAY, 'ms')
# label links as internal or external
for u, v in topology.edges_iter():
if u in sources or v in sources:
topology.edge[u][v]['type'] = 'external'
# this prevents sources to be used to route traffic
fnss.set_weights_constant(topology, 1000.0, [(u, v)])
fnss.set_delays_constant(topology, EXTERNAL_LINK_DELAY, 'ms', [(u, v)])
else:
topology.edge[u][v]['type'] = 'internal'
return IcnTopology(topology)
def topology_tree_HX(k, h, delay=1, **kwargs):
"""Returns a tree topology, with a source at the root, receivers at the
leafs and caches at all intermediate nodes.
Parameters
----------
h : int
The height of the tree
k : int
The branching factor of the tree
delay : float
The link delay in milliseconds
Returns
-------
topology : IcnTopology
The topology object
"""
topology = fnss.k_ary_tree_topology(k, h)
topology.add_path([0, 40])
topology.node[40]['depth'] = -1
receivers = [
v for v in topology.nodes_iter() if topology.node[v]['depth'] == h
]
sources = [40]
routers = [
v for v in topology.nodes_iter()
if topology.node[v]['depth'] >= 0 and topology.node[v]['depth'] < h
]
topology.graph['icr_candidates'] = set(routers)
for v in sources:
fnss.add_stack(topology, v, 'source')
for v in receivers:
fnss.add_stack(topology, v, 'receiver')
for v in routers:
fnss.add_stack(topology, v, 'router')
# set weights and delays on all links
fnss.set_weights_constant(topology, 1.0)
fnss.set_delays_constant(topology, 4, 'ms')
fnss.set_delays_constant(topology, 8, 'ms', [(0, 1), (0, 2), (0, 3),
(1, 0), (2, 0), (3, 0)])
# label links as internal
for u, v in topology.edges_iter():
if u in sources or v in sources:
topology.edge[u][v]['type'] = 'external'
else:
topology.edge[u][v]['type'] = 'internal'
return IcnTopology(topology)
def test_p_median_4(self):
"""
Test topology:
A ---- C ---- B ----[HIGH DIST] --- E --- D --- F
Expected facilities: 1, 4
"""
t = fnss.Topology()
nx.add_path(t, "ACBEDF")
fnss.set_weights_constant(t, 1)
fnss.set_weights_constant(t, 2, [("B", "E")])
distances = dict(nx.all_pairs_dijkstra_path_length(t, weight='weight'))
allocation, facilities, cost = algorithms.compute_p_median(distances, 4)
self.assertEqual(2, cost)
def test_p_median_4(self):
"""
Test topology:
A ---- C ---- B ----[HIGH DIST] --- E --- D --- F
Expected facilities: 1, 4
"""
t = fnss.Topology()
t.add_path("ACBEDF")
fnss.set_weights_constant(t, 1)
fnss.set_weights_constant(t, 2, [("B", "E")])
distances = dict(nx.all_pairs_dijkstra_path_length(t, weight='weight'))
allocation, facilities, cost = algorithms.compute_p_median(distances, 4)
self.assertEqual(2, cost)
def topology_mesh(n, m, delay_int=1, delay_ext=5, **kwargs):
"""Returns a ring topology
This topology is comprised of a mesh of *n* nodes. Each of these nodes is
attached to a receiver. In addition *m* router are attached each to a source.
Therefore, this topology has in fact 2n + m nodes.
Parameters
----------
n : int
The number of routers in the ring
m : int
The number of sources
delay_int : float
The internal link delay in milliseconds
delay_ext : float
The external link delay in milliseconds
Returns
-------
topology : IcnTopology
The topology object
"""
if m > n:
raise ValueError("m cannot be greater than n")
topology = fnss.full_mesh_topology(n)
routers = range(n)
receivers = range(n, 2 * n)
sources = range(2 * n, 2 * n + m)
internal_links = zip(routers, receivers)
external_links = zip(routers[:m], sources)
for u, v in internal_links:
topology.add_edge(u, v, type='internal')
for u, v in external_links:
topology.add_edge(u, v, type='external')
topology.graph['icr_candidates'] = set(routers)
for v in sources:
fnss.add_stack(topology, v, 'source')
for v in receivers:
fnss.add_stack(topology, v, 'receiver')
for v in routers:
fnss.add_stack(topology, v, 'router')
# set weights and delays on all links
fnss.set_weights_constant(topology, 1.0)
fnss.set_delays_constant(topology, delay_int, 'ms', internal_links)
fnss.set_delays_constant(topology, delay_ext, 'ms', external_links)
return IcnTopology(topology)
def test_p_median(self):
"""
Test topology:
A ---- B ---- C ----[HIGH DIST] --- D --- E --- F
Expected facilities: 1, 4
"""
t = fnss.Topology()
nx.add_path(t, "ABCDEF")
fnss.set_weights_constant(t, 1)
fnss.set_weights_constant(t, 2, [("C", "D")])
distances = dict(nx.all_pairs_dijkstra_path_length(t, weight='weight'))
allocation, facilities, cost = algorithms.compute_p_median(distances, 2)
self.assertDictEqual({"A": "B", "B": "B", "C": "B", "D": "E", "E": "E", "F": "E", }, allocation)
self.assertSetEqual(set("BE"), facilities)
self.assertEqual(4, cost)
def topology_tree_with_uCache(k, h, delay=1, **kwargs):
"""Returns a tree topology, with a source at the root, receivers at the
leafs and caches at the receivers and routers.
Parameters
----------
h : int
The height of the tree
k : int
The branching factor of the tree
delay : float
The link delay in milliseconds
Returns
-------
topology : IcnTopology
The topology object
"""
topology = fnss.k_ary_tree_topology(k, h)
receivers = [
v for v in topology.nodes_iter() if topology.node[v]['depth'] == h
]
sources = [
v for v in topology.nodes_iter() if topology.node[v]['depth'] == 0
]
routers = [
v for v in topology.nodes_iter()
if topology.node[v]['depth'] > 0 and topology.node[v]['depth'] < h
]
topology.graph['icr_candidates'] = set(routers)
topology.graph['uCache_candidates'] = set(receivers)
for v in sources:
fnss.add_stack(topology, v, 'source')
for v in receivers:
fnss.add_stack(topology, v, 'receiver')
for v in routers:
fnss.add_stack(topology, v, 'router')
# set weights and delays on all links
fnss.set_weights_constant(topology, 1.0)
fnss.set_delays_constant(topology, delay, 'ms')
# label links as internal
for u, v in topology.edges_iter():
topology.edge[u][v]['type'] = 'internal'
return IcnTopology(topology)
def topology_ring(n, delay_int=1, delay_ext=5, **kwargs):
"""Returns a ring topology
This topology is comprised of a ring of *n* nodes. Each of these nodes is
attached to a receiver. In addition one router is attached to a source.
Therefore, this topology has in fact 2n + 1 nodes.
It models the case of a metro ring network, with many receivers and one
only source towards the core network.
Parameters
----------
n : int
The number of routers in the ring
delay_int : float
The internal link delay in milliseconds
delay_ext : float
The external link delay in milliseconds
Returns
-------
topology : IcnTopology
The topology object
"""
topology = fnss.ring_topology(n)
topology.graph['type'] = "TREE"
routers = range(n)
receivers = range(n, 2 * n)
source = 2 * n
internal_links = zip(routers, receivers)
external_links = [(routers[0], source)]
for u, v in internal_links:
topology.add_edge(u, v, type='internal')
for u, v in external_links:
topology.add_edge(u, v, type='external')
topology.graph['icr_candidates'] = set(routers)
fnss.add_stack(topology, source, 'source')
for v in receivers:
fnss.add_stack(topology, v, 'receiver')
for v in routers:
fnss.add_stack(topology, v, 'router')
# set weights and delays on all links
fnss.set_weights_constant(topology, 1.0)
fnss.set_delays_constant(topology, delay_int, 'ms', internal_links)
fnss.set_delays_constant(topology, delay_ext, 'ms', external_links)
return IcnTopology(topology)
def topology_wide(**kwargs):
"""Return a scenario based on GARR topology
Parameters
----------
seed : int, optional
The seed used for random number generation
Returns
-------
topology : fnss.Topology
The topology object
"""
topology = fnss.parse_topology_zoo(
path.join(TOPOLOGY_RESOURCES_DIR, 'WideJpn.graphml')).to_undirected()
# sources are nodes representing neighbouring AS's
sources = [9, 8, 11, 13, 12, 15, 14, 17, 16, 19, 18]
# receivers are internal nodes with degree = 1
receivers = [27, 28, 3, 5, 4, 7]
# caches are all remaining nodes --> 27 caches
routers = [n for n in topology.nodes() if n not in receivers + sources]
# All routers can be upgraded to ICN functionalities
icr_candidates = routers
# set weights and delays on all links
fnss.set_weights_constant(topology, 1.0)
fnss.set_delays_constant(topology, INTERNAL_LINK_DELAY, 'ms')
# Deploy stacks
topology.graph['icr_candidates'] = set(icr_candidates)
for v in sources:
fnss.add_stack(topology, v, 'source')
for v in receivers:
fnss.add_stack(topology, v, 'receiver')
for v in routers:
fnss.add_stack(topology, v, 'router')
# label links as internal or external
for u, v in topology.edges():
if u in sources or v in sources:
topology.adj[u][v]['type'] = 'external'
# this prevents sources to be used to route traffic
fnss.set_weights_constant(topology, 1000.0, [(u, v)])
fnss.set_delays_constant(topology, EXTERNAL_LINK_DELAY, 'ms',
[(u, v)])
else:
topology.adj[u][v]['type'] = 'internal'
return IcnTopology(topology)
def topology_hierarchy(k, h, delay=1, **kwargs):
"""Returns a tree topology, with a source at the root, receivers at the
leafs and caches at all intermediate nodes.
Parameters
----------
h : int
The height of the tree
k : int
The branching factor of the tree
delay : float
The link delay in milliseconds
Returns
-------
topology : IcnTopology
The topology object
"""
topology = fnss.k_ary_tree_topology(k, h)
receivers = [v for v in topology.nodes()
if topology.node[v]['depth'] == h]
sources = [v for v in topology.nodes()
if topology.node[v]['depth'] == 0]
routers = [v for v in topology.nodes()
if topology.node[v]['depth'] > 0
and topology.node[v]['depth'] < h]
topology.graph['icr_candidates'] = set(routers)
for v in sources:
fnss.add_stack(topology, v, 'source')
for v in receivers:
fnss.add_stack(topology, v, 'receiver')
for v in routers:
fnss.add_stack(topology, v, 'router')
# label links as internal
for u, v in topology.edges():
topology.adj[u][v]['type'] = 'external' if u in sources or v in sources else 'internal'
# for u, v in path_links(routers):
# topology.add_edge(u, v, type='internal')
# set weights and delays on all links
fnss.set_weights_constant(topology, 1.0)
fnss.set_delays_constant(topology, delay, 'ms', [(u, v) for u, v in topology.edges() if u in receivers or v in receivers])
fnss.set_delays_constant(topology, 10*delay, 'ms', [(u, v) for u, v in topology.edges() if u in routers and v in routers])
fnss.set_delays_constant(topology, 60*delay, 'ms', [(u, v) for u, v in topology.edges() if u in sources or v in sources])
return IcnTopology(topology)
def topology_tandem(n=3,nc=0.01, **kwargs):
T = 'TANDEM' # name of the topology
topology = fnss.line_topology(n)
topology = list(nx.connected_component_subgraphs(topology))[0]
receivers = [0]
routers = [1, 2]
#sources = [2]
source_attachment = routers[1];
source = source_attachment + 1000
topology.add_edge(source_attachment, source)
sources = [source]
topology.graph['icr_candidates'] = set(routers)
fnss.add_stack(topology, source, 'source')
#for v in sources:
# fnss.add_stack(topology, v, 'source')
for v in receivers:
fnss.add_stack(topology, v, 'receiver')
for v in routers:
fnss.add_stack(topology, v, 'router')
fnss.set_weights_constant(topology, 1.0)
fnss.set_delays_constant(topology, INTERNAL_LINK_DELAY, 'ms')
for u, v in topology.edges_iter():
if u in sources or v in sources:
topology.edge[u][v]['type'] = 'external'
# this prevents sources to be used to route traffic
fnss.set_weights_constant(topology, 1000.0, [(u, v)])
fnss.set_delays_constant(topology, EXTERNAL_LINK_DELAY, 'ms', [(u, v)])
else:
topology.edge[u][v]['type'] = 'internal'
C = str(nc)
fnss.write_topology(topology, path.join(TOPOLOGY_RESOURCES_DIR, topo_prefix + 'T=%s@C=%s' % (T, C) + '.xml'))
return IcnTopology(topology)
def my_topology(cls):
"""Return my topology for testing caching strategies
"""
# Topology sketch
# 0
# / \
# / \
# / \
# 1 2
# / \ / \
# 3 4 5 6
# / \ / \ / \ / \
# 7 8 9 10 11 1213 14
#
k = 2
h = 3
delay = 5
topology = IcnTopology(fnss.k_ary_tree_topology(k, h))
receivers = [
v for v in topology.nodes_iter() if topology.node[v]['depth'] == h
]
sources = [
v for v in topology.nodes_iter() if topology.node[v]['depth'] == 0
]
routers = [
v for v in topology.nodes_iter()
if topology.node[v]['depth'] > 0 and topology.node[v]['depth'] < h
]
topology.graph['icr_candidates'] = set(routers)
for v in receivers:
fnss.add_stack(topology, v, 'receiver')
for v in routers:
fnss.add_stack(topology, v, 'router', {'cache_size': 2})
contents = (1, 2, 3)
fnss.add_stack(topology, source, 'source', {'contents': contents})
# set weights and delays on all links
fnss.set_weights_constant(topology, 1.0)
fnss.set_delays_constant(topology, delay, 'ms')
fnss.set_delays_constant(topology, 20, 'ms', [(0, 1), (0, 2)])
# label links as internal
for u, v in topology.edges_iter():
topology.edge[u][v]['type'] = 'internal'
return IcnTopology(topology)
def test_p_median_6(self):
"""
Test topology:
A ---- C ---- B ----[HIGH DIST] --- E --- D --- F
Expected facilities: 1, 4
"""
t = fnss.Topology()
t.add_path("ACBEDF")
fnss.set_weights_constant(t, 1)
fnss.set_weights_constant(t, 2, [("B", "E")])
distances = nx.all_pairs_dijkstra_path_length(t, weight='weight')
allocation, facilities, cost = algorithms.compute_p_median(
distances, 6)
self.assertDictEqual({i: i for i in "ABCDEF"}, allocation)
self.assertSetEqual(set("ABCDEF"), facilities)
self.assertEqual(0, cost)
def test_p_median_6(self):
"""
Test topology:
A ---- C ---- B ----[HIGH DIST] --- E --- D --- F
Expected facilities: 1, 4
"""
t = fnss.Topology()
nx.add_path(t, "ACBEDF")
fnss.set_weights_constant(t, 1)
fnss.set_weights_constant(t, 2, [("B", "E")])
distances = dict(nx.all_pairs_dijkstra_path_length(t, weight='weight'))
allocation, facilities, cost = algorithms.compute_p_median(
distances, 6)
assert {i: i for i in "ABCDEF"} == allocation
assert set("ABCDEF") == facilities
assert 0 == cost
def topology_path(network_cache=0.05, n_contents=100000, n=3, seed=None):
"""
Return a scenario based on path topology
Parameters
----------
network_cache : float
Size of network cache (sum of all caches) normalized by size of content
population
n_contents : int
Size of content population
seed : int, optional
The seed used for random number generation
Returns
-------
topology : fnss.Topology
The topology object
"""
# 240 nodes in the main component
topology = fnss.line_topology(n)
receivers = [0]
caches = range(1, n-1)
sources = [n-1]
# randomly allocate contents to sources
content_placement = uniform_content_placement(topology, range(1, n_contents+1), sources, seed=seed)
for v in sources:
fnss.add_stack(topology, v, 'source', {'contents': content_placement[v]})
for v in receivers:
fnss.add_stack(topology, v, 'receiver', {})
# set weights and delays on all links
fnss.set_weights_constant(topology, 1.0)
fnss.set_delays_constant(topology, INTERNAL_LINK_DELAY, 'ms')
# label links as internal or external
for u, v in topology.edges_iter():
if u in sources or v in sources:
topology.edge[u][v]['type'] = 'external'
fnss.set_delays_constant(topology, EXTERNAL_LINK_DELAY, 'ms', [(u, v)])
else:
topology.edge[u][v]['type'] = 'internal'
cache_placement = uniform_cache_placement(topology, network_cache*n_contents, caches)
for node, size in cache_placement.iteritems():
fnss.add_stack(topology, node, 'cache', {'size': size})
return topology
def topology_garr(**kwargs):
"""Return a scenario based on GARR topology
Parameters
----------
seed : int, optional
The seed used for random number generation
Returns
-------
topology : fnss.Topology
The topology object
"""
topology = fnss.parse_topology_zoo(path.join(TOPOLOGY_RESOURCES_DIR, 'Garr201201.graphml')).to_undirected()
# sources are nodes representing neighbouring AS's
sources = [0, 2, 3, 5, 13, 16, 23, 24, 25, 27, 51, 52, 54]
# receivers are internal nodes with degree = 1
receivers = [1, 7, 8, 9, 11, 12, 19, 26, 28, 30, 32, 33, 41, 42, 43, 47, 48, 50, 53, 57, 60]
# caches are all remaining nodes --> 27 caches
routers = [n for n in topology.nodes() if n not in receivers + sources]
icr_candidates = routers
# set weights and delays on all links
fnss.set_weights_constant(topology, 1.0)
fnss.set_delays_constant(topology, INTERNAL_LINK_DELAY, 'ms')
# Deploy stacks
topology.graph['icr_candidates'] = set(icr_candidates)
for v in sources:
fnss.add_stack(topology, v, 'source')
for v in receivers:
fnss.add_stack(topology, v, 'receiver')
for v in routers:
fnss.add_stack(topology, v, 'router')
# label links as internal or external
for u, v in topology.edges():
if u in sources or v in sources:
topology.edge[u][v]['type'] = 'external'
# this prevents sources to be used to route traffic
fnss.set_weights_constant(topology, 1000.0, [(u, v)])
fnss.set_delays_constant(topology, EXTERNAL_LINK_DELAY, 'ms',[(u, v)])
else:
topology.edge[u][v]['type'] = 'internal'
return IcnTopology(topology)
def topology_wide(**kwargs):
"""Return a scenario based on WIDE topology
Parameters
----------
seed : int, optional
The seed used for random number generation
Returns
-------
topology : fnss.Topology
The topology object
"""
topology = fnss.parse_topology_zoo(path.join(TOPOLOGY_RESOURCES_DIR, 'WideJpn.graphml')).to_undirected()
# sources are nodes representing neighbouring AS's
sources = [9, 8, 11, 13, 12, 15, 14, 17, 16, 19, 18]
# receivers are internal nodes with degree = 1
receivers = [27, 28, 3, 5, 4, 7]
# caches are all remaining nodes --> 27 caches
routers = [n for n in topology.nodes() if n not in receivers + sources]
# All routers can be upgraded to ICN functionalitirs
icr_candidates = routers
# set weights and delays on all links
fnss.set_weights_constant(topology, 1.0)
fnss.set_delays_constant(topology, INTERNAL_LINK_DELAY, 'ms')
# Deploy stacks
topology.graph['icr_candidates'] = set(icr_candidates)
for v in sources:
fnss.add_stack(topology, v, 'source')
for v in receivers:
fnss.add_stack(topology, v, 'receiver')
for v in routers:
fnss.add_stack(topology, v, 'router')
# label links as internal or external
for u, v in topology.edges():
if u in sources or v in sources:
topology.edge[u][v]['type'] = 'external'
# this prevents sources to be used to route traffic
fnss.set_weights_constant(topology, 1000.0, [(u, v)])
fnss.set_delays_constant(topology, EXTERNAL_LINK_DELAY, 'ms',[(u, v)])
else:
topology.edge[u][v]['type'] = 'internal'
return IcnTopology(topology)
def test_base_topology_class(self):
weight = 2
capacity = 3
delay = 4
buffer_size = 5
topology = fnss.Topology()
topology.add_path([1, 2, 3])
fnss.set_weights_constant(topology, weight)
fnss.set_capacities_constant(topology, capacity)
fnss.set_delays_constant(topology, delay)
fnss.set_buffer_sizes_constant(topology, buffer_size)
weights = topology.weights()
capacities = topology.capacities()
delays = topology.delays()
buffer_sizes = topology.buffers()
for e in topology.edges_iter():
self.assertEqual(weight, weights[e])
self.assertEqual(capacity, capacities[e])
self.assertEqual(delay, delays[e])
self.assertEqual(buffer_size, buffer_sizes[e])
def test_base_topology_class(self):
weight = 2
capacity = 3
delay = 4
buffer_size = 5
topology = fnss.Topology()
topology.add_path([1, 2, 3])
fnss.set_weights_constant(topology, weight)
fnss.set_capacities_constant(topology, capacity)
fnss.set_delays_constant(topology, delay)
fnss.set_buffer_sizes_constant(topology, buffer_size)
weights = topology.weights()
capacities = topology.capacities()
delays = topology.delays()
buffer_sizes = topology.buffers()
for e in topology.edges():
self.assertEqual(weight, weights[e])
self.assertEqual(capacity, capacities[e])
self.assertEqual(delay, delays[e])
self.assertEqual(buffer_size, buffer_sizes[e])
def topology_binary_tree(**kwargs):
"""Returns a tree topology
Parameters
----------
seed : int, optional
The seed used for random number generation
Returns
-------
topology : fnss.Topology
The topology object
"""
h = 5 # depth of the tree
topology = fnss.k_ary_tree_topology(2, h)
receivers = [v for v in topology.nodes_iter()
if topology.node[v]['depth'] == h]
sources = [v for v in topology.nodes_iter()
if topology.node[v]['depth'] == 0]
routers = [v for v in topology.nodes_iter()
if topology.node[v]['depth'] > 0
and topology.node[v]['depth'] < h]
topology.graph['icr_candidates'] = set(routers)
for v in sources:
fnss.add_stack(topology, v, 'source')
for v in receivers:
fnss.add_stack(topology, v, 'receiver')
for v in routers:
fnss.add_stack(topology, v, 'router')
# set weights and delays on all links
fnss.set_weights_constant(topology, 1.0)
fnss.set_delays_constant(topology, INTERNAL_LINK_DELAY, 'ms')
# label links as internal or external
for u, v in topology.edges_iter():
if u in sources or v in sources:
topology.edge[u][v]['type'] = 'external'
fnss.set_delays_constant(topology, EXTERNAL_LINK_DELAY, 'ms', [(u, v)])
else:
topology.edge[u][v]['type'] = 'internal'
return IcnTopology(topology)
def topology_tree(k, h, delay=1, **kwargs):
"""Returns a tree topology, with a source at the root, receivers at the
leafs and caches at all intermediate nodes.
Parameters
----------
h : height
The height of the tree
k : branching factor
The branching factor of the tree
delay : float
The link delay in milliseconds
Returns
-------
topology : IcnTopology
The topology object
"""
topology = fnss.k_ary_tree_topology(k, h)
receivers = [v for v in topology.nodes_iter()
if topology.node[v]['depth'] == h]
sources = [v for v in topology.nodes_iter()
if topology.node[v]['depth'] == 0]
routers = [v for v in topology.nodes_iter()
if topology.node[v]['depth'] > 0
and topology.node[v]['depth'] < h]
topology.graph['icr_candidates'] = set(routers)
for v in sources:
fnss.add_stack(topology, v, 'source')
for v in receivers:
fnss.add_stack(topology, v, 'receiver')
for v in routers:
fnss.add_stack(topology, v, 'router')
# set weights and delays on all links
fnss.set_weights_constant(topology, 1.0)
fnss.set_delays_constant(topology, delay, 'ms')
# label links as internal
for u, v in topology.edges_iter():
topology.edge[u][v]['type'] = 'internal'
return IcnTopology(topology)
def topology_tree(k, h, delay=1, **kwargs):
"""Returns a tree topology, with a source at the root, receivers at the
leafs and caches at all intermediate nodes.
Parameters
----------
h : int
The height of the tree
k : int
The branching factor of the tree
delay : float
The link delay in milliseconds
Returns
-------
topology : IcnTopology
The topology object
"""
topology = fnss.k_ary_tree_topology(k, h)
receivers = [v for v in topology.nodes() if topology.node[v]["depth"] == h]
sources = [v for v in topology.nodes() if topology.node[v]["depth"] == 0]
routers = [
v for v in topology.nodes()
if topology.node[v]["depth"] > 0 and topology.node[v]["depth"] < h
]
topology.graph["icr_candidates"] = set(routers)
for v in sources:
fnss.add_stack(topology, v, "source")
for v in receivers:
fnss.add_stack(topology, v, "receiver")
for v in routers:
fnss.add_stack(topology, v, "router")
# set weights and delays on all links
fnss.set_weights_constant(topology, 1.0)
fnss.set_delays_constant(topology, delay, "ms")
# label links as internal
for u, v in topology.edges():
topology.adj[u][v]["type"] = "internal"
return IcnTopology(topology)
def test_p_median(self):
# Test topology:
#
# A ---- B ---- C ----[HIGH DIST] --- D --- E --- F
#
# Expected facilities: 1, 4
t = fnss.Topology()
nx.add_path(t, "ABCDEF")
fnss.set_weights_constant(t, 1)
fnss.set_weights_constant(t, 2, [("C", "D")])
distances = dict(nx.all_pairs_dijkstra_path_length(t, weight='weight'))
allocation, facilities, cost = algorithms.compute_p_median(
distances, 2)
assert allocation == {
"A": "B",
"B": "B",
"C": "B",
"D": "E",
"E": "E",
"F": "E",
}
assert facilities == set("BE")
assert cost == 4
def topology_path(n=3, **kwargs):
"""Return a scenario based on path topology
Parameters
----------
seed : int, optional
The seed used for random number generation
Returns
-------
topology : fnss.Topology
The topology object
"""
# 240 nodes in the main component
topology = fnss.line_topology(n)
receivers = [0]
routers = range(1, n-1)
sources = [n-1]
topology.graph['icr_candidates'] = set(routers)
for v in sources:
fnss.add_stack(topology, v, 'source')
for v in receivers:
fnss.add_stack(topology, v, 'receiver')
for v in routers:
fnss.add_stack(topology, v, 'router')
# set weights and delays on all links
fnss.set_weights_constant(topology, 1.0)
fnss.set_delays_constant(topology, INTERNAL_LINK_DELAY, 'ms')
# label links as internal or external
for u, v in topology.edges_iter():
if u in sources or v in sources:
topology.edge[u][v]['type'] = 'external'
fnss.set_delays_constant(topology, EXTERNAL_LINK_DELAY, 'ms', [(u, v)])
else:
topology.edge[u][v]['type'] = 'internal'
return IcnTopology(topology)
def topology_tiscali(network_cache=0.05, n_contents=100000, seed=None):
"""
Return a scenario based on Tiscali topology, parsed from RocketFuel dataset
Parameters
----------
network_cache : float
Size of network cache (sum of all caches) normalized by size of content
population
n_contents : int
Size of content population
seed : int, optional
The seed used for random number generation
Returns
-------
topology : fnss.Topology
The topology object
"""
# 240 nodes in the main component
topology = fnss.parse_rocketfuel_isp_map(path.join(TOPOLOGY_RESOURCES_DIR,
'3257.r0.cch')
).to_undirected()
topology = nx.connected_component_subgraphs(topology)[0]
# degree of nodes
deg = nx.degree(topology)
# nodes with degree = 1
onedeg = [v for v in topology.nodes() if deg[v] == 1] # they are 80
# we select as caches nodes with highest degrees
# we use as min degree 6 --> 36 nodes
# If we changed min degrees, that would be the number of caches we would have:
# Min degree N caches
# 2 160
# 3 102
# 4 75
# 5 50
# 6 36
# 7 30
# 8 26
# 9 19
# 10 16
# 11 12
# 12 11
# 13 7
# 14 3
# 15 3
# 16 2
caches = [v for v in topology.nodes() if deg[v] >= 6] # 36 nodes
# sources are node with degree 1 whose neighbor has degree at least equal to 5
# we assume that sources are nodes connected to a hub
# they are 44
sources = [v for v in onedeg if deg[list(topology.edge[v].keys())[0]] > 4.5] # they are
# receivers are node with degree 1 whose neighbor has degree at most equal to 4
# we assume that receivers are nodes not well connected to the network
# they are 36
receivers = [v for v in onedeg if deg[list(topology.edge[v].keys())[0]] < 4.5]
# we set router stacks because some strategies will fail if no stacks
# are deployed
routers = [v for v in topology.nodes() if v not in caches + sources + receivers]
# set weights and delays on all links
fnss.set_weights_constant(topology, 1.0)
fnss.set_delays_constant(topology, INTERNAL_LINK_DELAY, 'ms')
# randomly allocate contents to sources
content_placement = uniform_content_placement(topology, range(1, n_contents+1),
sources, seed=seed)
for v in sources:
fnss.add_stack(topology, v, 'source', {'contents': content_placement[v]})
for v in receivers:
fnss.add_stack(topology, v, 'receiver', {})
for v in routers:
fnss.add_stack(topology, v, 'router', {})
# label links as internal or external
for u, v in topology.edges():
if u in sources or v in sources:
topology.edge[u][v]['type'] = 'external'
# this prevents sources to be used to route traffic
fnss.set_weights_constant(topology, 1000.0, [(u, v)])
fnss.set_delays_constant(topology, EXTERNAL_LINK_DELAY, 'ms', [(u, v)])
else:
topology.edge[u][v]['type'] = 'internal'
cache_placement = uniform_cache_placement(topology, network_cache*n_contents, caches)
for node, size in cache_placement.iteritems():
fnss.add_stack(topology, node, 'cache', {'size': size})
return topology
def test_weights_constant(self):
fnss.set_weights_constant(self.topo, 2, self.odd_links)
fnss.set_weights_constant(self.topo, 5, self.even_links)
self.assertTrue(
all(self.topo.adj[u][v]['weight'] in [2, 5]
for (u, v) in self.topo.edges()))
"""
import fnss
import networkx as nx
# create a topology with 10 core switches, 20 edge switches and 10 hosts
# per switch (i.e. 200 hosts in total)
topology = fnss.two_tier_topology(n_core=10, n_edge=20, n_hosts=10)
# assign capacities
# let's set links connecting servers to edge switches to 1 Gbps
# and links connecting core and edge switches to 10 Gbps.
# get list of core_edge links and edge_leaf links
link_types = nx.get_edge_attributes(topology, 'type')
core_edge_links = [link for link in link_types
if link_types[link] == 'core_edge']
edge_leaf_links = [link for link in link_types
if link_types[link] == 'edge_leaf']
# assign capacities
fnss.set_capacities_constant(topology, 1, 'Gbps', edge_leaf_links)
fnss.set_capacities_constant(topology, 10, 'Gbps', core_edge_links)
# assign weight 1 to all links
fnss.set_weights_constant(topology, 1)
# assign delay of 10 nanoseconds to each link
fnss.set_delays_constant(topology, 10, 'ns')
# save topology to a file
fnss.write_topology(topology, 'datacenter_topology.xml')
def topology_geant_custom(network_cache=0.05, n_contents=100000, seed=None):
"""
Return a scenario based on GEANT topology
Parameters
----------
network_cache : float
Size of network cache (sum of all caches) normalized by size of content
population
n_contents : int
Size of content population
seed : int, optional
The seed used for random number generation
Returns
-------
topology : fnss.Topology
The topology object
"""
topology = fnss.parse_topology_zoo(path.join(TOPOLOGY_RESOURCES_DIR,
"Geant2012.graphml")
).to_undirected()
topology = list(nx.connected_component_subgraphs(topology))[0]
deg = nx.degree(topology)
caches = [v for v in topology.nodes()] # 38 nodes
cache_catogory = [1,4,2,1,3,3,3,1,4,3,2,1,1,2,1,4,2,3,1,3,3,2,3,4,4,2,3,1,3,1,3,1,3,1,1,3,1,1,4,1]
count = 0
for node in caches:
fnss.add_stack(topology, node, 'receiver', {})
count += 1
# attach sources to topology
source_attachments = [v for v in topology.nodes() if deg[v] == 2] # 13 nodes
sources = []
for v in source_attachments:
u = v + 1000 # node ID of source
topology.add_edge(v, u)
sources.append(u)
# randomly allocate contents to sources
content_placement = uniform_content_placement(topology, range(1, n_contents+1), sources, seed=seed)
# add stacks to nodes
for v in sources:
fnss.add_stack(topology, v, 'source', {'contents': content_placement[v]})
# set weights and delays on all links
fnss.set_weights_constant(topology, 1.0)
fnss.set_delays_constant(topology, INTERNAL_LINK_DELAY, 'ms')
# label links as internal or external
for u, v in topology.edges_iter():
if u in sources or v in sources:
topology.edge[u][v]['type'] = 'external'
# this prevents sources to be used to route traffic
fnss.set_weights_constant(topology, 1000.0, [(u, v)])
fnss.set_delays_constant(topology, EXTERNAL_LINK_DELAY, 'ms', [(u, v)])
else:
topology.edge[u][v]['type'] = 'internal'
# place caches
cache_placement = uniform_cache_placement(topology, network_cache*n_contents, caches)
for node, size in cache_placement.iteritems():
fnss.add_stack(topology, node, 'cache', {'size': size})
return topology
def topology_grid(network_cache=0.35, n_contents=100000, seed=None):
# This gives you a 2D grid topology 3x2
topology = fnss.Topology(nx.grid_2d_graph(10,10))
# If you want a 3D grid topology, use this command instead
# This create a 4x3x2 3D grid
# topology = fnss.Topology(nx.grid_graph([4,3,2]))
# TODO: Here place caches, content sources, receivers.
# See other topology generators as examples
topology = nx.connected_component_subgraphs(topology)[0]
deg = nx.degree(topology)
nodes = topology.nodes()
num_sources = 4
num_receivers = 30
source_attachments = []
sources = []
receivers = []
caches = []
chosen_attachments = 0
chosen_receivers = 0
# Random pacement of SOURCES
completed = False
while (completed == False):
x = random.choice(nodes)
if x in source_attachments:
continue
else:
source_attachments.append(x)
chosen_attachments += 1
if chosen_attachments == num_attachments:
completed = True
for v in source_attachments:
u = v + 1000 # node ID of source
topology.add_edge(v, u)
sources.append(u)
# Random placement of RECEIVERS
completed = False
while (completed == False):
x = random.choice(nodes)
if x in source_attachments:
continue
else:
receivers.append(x)
chosen_receivers += 1
if chosen_receivers == num_receivers:
completed = True
# Placement of RECEIVERS
caches = [v for v in nodes if v not in receivers]
# randomly allocate contents to sources
content_placement = uniform_content_placement(topology, range(1, n_contents+1), sources, seed=seed)
# add stacks to nodes
for v in sources:
fnss.add_stack(topology, v, 'source', {'contents': content_placement[v]})
for v in receivers:
fnss.add_stack(topology, v, 'receiver', {})
# set weights and delays on all links
fnss.set_weights_constant(topology, 1.0)
fnss.set_delays_constant(topology, INTERNAL_LINK_DELAY, 'ms')
# label links as internal or external
for u, v in topology.edges_iter():
if u in sources or v in sources:
topology.edge[u][v]['type'] = 'external'
# this prevents sources to be used to route traffic
fnss.set_weights_constant(topology, 1000.0, [(u, v)])
fnss.set_delays_constant(topology, EXTERNAL_LINK_DELAY, 'ms', [(u, v)])
else:
topology.edge[u][v]['type'] = 'internal'
# place caches
cache_placement = uniform_cache_placement(topology, network_cache*n_contents, caches)
for node, size in cache_placement.iteritems():
fnss.add_stack(topology, node, 'cache', {'size': size})
return topology
def topology_grid(nc=0.35, **kwargs):
T = 'GRID' # name of the topology
topology = fnss.Topology(nx.grid_2d_graph(10,10))
topology = list(nx.connected_component_subgraphs(topology))[0]
deg = nx.degree(topology)
nodes = topology.nodes()
print "Number of NODES #"
print len(nodes)
receivers = []
routers = []
#sources = [2]
source_attachment = random.choice(nodes)
source = source_attachment + (1000,1000)
topology.add_edge(source_attachment, source)
sources = [source]
# Random placement of RECEIVERS
num_receivers = 30
chosen_receivers = 0
completed = False
#print "RECEIVERS"
while (completed == False):
x = random.choice(nodes)
if x == source_attachment:
continue
else:
if x not in receivers:
receivers.append(x)
chosen_receivers += 1
if chosen_receivers == num_receivers:
completed = True
# Placement of Routers
routers = [v for v in nodes if v not in receivers]
print "Number of CLIENTS #"
print len(receivers)
print "Number of ROUTERS #"
print len(routers)
topology.graph['icr_candidates'] = set(routers)
fnss.add_stack(topology, source, 'source')
#for v in sources:
# fnss.add_stack(topology, v, 'source')
for v in receivers:
fnss.add_stack(topology, v, 'receiver')
for v in routers:
fnss.add_stack(topology, v, 'router')
fnss.set_weights_constant(topology, 1.0)
fnss.set_delays_constant(topology, INTERNAL_LINK_DELAY, 'ms')
for u, v in topology.edges_iter():
if u in sources or v in sources:
topology.edge[u][v]['type'] = 'external'
# this prevents sources to be used to route traffic
fnss.set_weights_constant(topology, 1000.0, [(u, v)])
fnss.set_delays_constant(topology, EXTERNAL_LINK_DELAY, 'ms', [(u, v)])
else:
topology.edge[u][v]['type'] = 'internal'
C = str(nc)
fnss.write_topology(topology, path.join(TOPOLOGY_RESOURCES_DIR, topo_prefix + 'T=%s@C=%s' % (T, C) + '.xml'))
return IcnTopology(topology)
#!/usr/bin/env python
# -*- coding: utf-8 -*-
#Import the libriraies
import fnss
import networkx as nx
#Create SN
#Read the Topology from the BRITE file
topology = fnss.parse_brite("bigSN.brite")
#Set weight to 1
fnss.set_weights_constant(topology, 1)
#Create a Grapth based on the topology read
SN = nx.Graph(topology)
for n in SN.nodes():
SN.node[n]['sync'] = False
SN.node[n]['max_cpu'] = 100
SN.node[n]['cur_cpu'] = 100
SN.node[n]['idle'] = True
for u, v in SN.edges():
SN.edge[u][v]['sync'] = False
SN.edge[u][v]['max_bw'] = 1000
SN.edge[u][v]['cur_bw'] = 1000
#Create Virtual Network 1
topology = fnss.parse_brite("VN1.brite")
#Set weight to 1
def scenario_geant(net_cache=[0.05], n_contents=100000, alpha=[0.6, 0.8, 1.0]):
"""
Return a scenario based on GARR topology
Parameters
----------
scenario_id : str
String identifying the scenario (will be in the filename)
net_cache : float
Size of network cache (sum of all caches) normalized by size of content
population
n_contents : int
Size of content population
alpha : float
List of alpha of Zipf content distribution
"""
rate = 12.0
warmup = 9000
duration = 36000
T = 'GEANT' # name of the topology
# 240 nodes in the main component
topology = fnss.parse_topology_zoo(path.join(scenarios_dir, 'resources/Geant2012.graphml')).to_undirected()
topology = nx.connected_component_subgraphs(topology)[0]
deg = nx.degree(topology)
receivers = [v for v in topology.nodes() if deg[v] == 1] # 8 nodes
caches = [v for v in topology.nodes() if deg[v] > 2] # 19 nodes
# attach sources to topology
source_attachments = [v for v in topology.nodes() if deg[v] == 2] # 13 nodes
sources = []
for v in source_attachments:
u = v + 1000 # node ID of source
topology.add_edge(v, u)
sources.append(u)
routers = [v for v in topology.nodes() if v not in caches + sources + receivers]
# randomly allocate contents to sources
contents = dict([(v, []) for v in sources])
for c in range(1, n_contents + 1):
s = choice(sources)
contents[s].append(c)
for v in sources:
fnss.add_stack(topology, v, 'source', {'contents': contents[v]})
for v in receivers:
fnss.add_stack(topology, v, 'receiver', {})
for v in routers:
fnss.add_stack(topology, v, 'router', {})
# set weights and delays on all links
fnss.set_weights_constant(topology, 1.0)
fnss.set_delays_constant(topology, internal_link_delay, 'ms')
# label links as internal or external
for u, v in topology.edges():
if u in sources or v in sources:
topology.edge[u][v]['type'] = 'external'
# this prevents sources to be used to route traffic
fnss.set_weights_constant(topology, 1000.0, [(u, v)])
fnss.set_delays_constant(topology, external_link_delay, 'ms', [(u, v)])
else:
topology.edge[u][v]['type'] = 'internal'
for nc in net_cache:
size = (float(nc)*n_contents)/len(caches) # size of a single cache
C = str(nc)
for v in caches:
fnss.add_stack(topology, v, 'cache', {'size': size})
fnss.write_topology(topology, path.join(scenarios_dir, topo_prefix + 'T=%s@C=%s' % (T, C) + '.xml'))
print('[WROTE TOPOLOGY] T: %s, C: %s' % (T, C))
for a in alpha:
event_schedule = gen_req_schedule(receivers, rate, warmup, duration, n_contents, a)
fnss.write_event_schedule(event_schedule, path.join(scenarios_dir, es_prefix + 'T=%s@A=%s' % (T, str(a)) + '.xml'))
print('[WROTE SCHEDULE] T: %s, Alpha: %s, Events: %d' % (T, str(a), len(event_schedule)))
def topology_tiscali2(**kwargs):
"""Return a scenario based on Tiscali topology, parsed from RocketFuel dataset
Differently from plain Tiscali, this topology some receivers are appended to
routers and only a subset of routers which are actually on the path of some
traffic are selected to become ICN routers. These changes make this
topology more realistic.
Parameters
----------
seed : int, optional
The seed used for random number generation
Returns
-------
topology : fnss.Topology
The topology object
"""
# 240 nodes in the main component
topology = fnss.parse_rocketfuel_isp_map(path.join(TOPOLOGY_RESOURCES_DIR,
'3257.r0.cch')
).to_undirected()
topology = list(nx.connected_component_subgraphs(topology))[0]
# degree of nodes
deg = nx.degree(topology)
# nodes with degree = 1
onedeg = [v for v in topology.nodes() if deg[v] == 1] # they are 80
# we select as caches nodes with highest degrees
# we use as min degree 6 --> 36 nodes
# If we changed min degrees, that would be the number of caches we would have:
# Min degree N caches
# 2 160
# 3 102
# 4 75
# 5 50
# 6 36
# 7 30
# 8 26
# 9 19
# 10 16
# 11 12
# 12 11
# 13 7
# 14 3
# 15 3
# 16 2
icr_candidates = [v for v in topology.nodes() if deg[v] >= 6] # 36 nodes
# Add remove caches to adapt betweenness centrality of caches
for i in [181, 208, 211, 220, 222, 250, 257]:
icr_candidates.remove(i)
icr_candidates.extend([232, 303, 326, 363, 378])
# sources are node with degree 1 whose neighbor has degree at least equal to 5
# we assume that sources are nodes connected to a hub
# they are 44
sources = [v for v in onedeg if deg[list(topology.edge[v].keys())[0]] > 4.5] # they are
# receivers are node with degree 1 whose neighbor has degree at most equal to 4
# we assume that receivers are nodes not well connected to the network
# they are 36
receivers = [v for v in onedeg if deg[list(topology.edge[v].keys())[0]] < 4.5]
# we set router stacks because some strategies will fail if no stacks
# are deployed
routers = [v for v in topology.nodes() if v not in sources + receivers]
# set weights and delays on all links
fnss.set_weights_constant(topology, 1.0)
fnss.set_delays_constant(topology, INTERNAL_LINK_DELAY, 'ms')
# deploy stacks
topology.graph['icr_candidates'] = set(icr_candidates)
for v in sources:
fnss.add_stack(topology, v, 'source')
for v in receivers:
fnss.add_stack(topology, v, 'receiver')
for v in routers:
fnss.add_stack(topology, v, 'router')
# label links as internal or external
for u, v in topology.edges():
if u in sources or v in sources:
topology.edge[u][v]['type'] = 'external'
# this prevents sources to be used to route traffic
fnss.set_weights_constant(topology, 1000.0, [(u, v)])
fnss.set_delays_constant(topology, EXTERNAL_LINK_DELAY, 'ms', [(u, v)])
else:
topology.edge[u][v]['type'] = 'internal'
return IcnTopology(topology)
def scenario_tiscali(net_cache=[0.05], n_contents=100000, alpha=[0.6, 0.8, 1.0]):
"""
Return a scenario based on Tiscali topology, parsed from RocketFuel dataset
Parameters
----------
scenario_id : str
String identifying the scenario (will be in the filename)
net_cache : float
Size of network cache (sum of all caches) normalized by size of content
population
n_contents : int
Size of content population
alpha : float
List of alpha of Zipf content distribution
"""
rate = 12.0
warmup = 9000
duration = 36000
T = 'TISCALI' # name of the topology
# 240 nodes in the main component
topology = fnss.parse_rocketfuel_isp_map(path.join(scenarios_dir, 'resources/3257.r0.cch')).to_undirected()
topology = nx.connected_component_subgraphs(topology)[0]
deg = nx.degree(topology)
onedeg = [v for v in topology.nodes() if deg[v] == 1] # they are 80
# we select as caches nodes with highest degrees
# we use as min degree 6 --> 36 nodes
# If we changed min degrees, that would be the number of caches we would have:
# Min degree N caches
# 2 160
# 3 102
# 4 75
# 5 50
# 6 36
# 7 30
# 8 26
# 9 19
# 10 16
# 11 12
# 12 11
# 13 7
# 14 3
# 15 3
# 16 2
caches = [v for v in topology.nodes() if deg[v] >= 6] # 36 nodes
# sources are node with degree 1 whose neighbor has degree at least equal to 5
# we assume that sources are nodes connected to a hub
# they are 44
sources = [v for v in onedeg if deg[list(topology.edge[v].keys())[0]] > 4.5] # they are
# receivers are node with degree 1 whose neighbor has degree at most equal to 4
# we assume that receivers are nodes not well connected to the network
# they are 36
receivers = [v for v in onedeg if deg[list(topology.edge[v].keys())[0]] < 4.5]
# we set router stacks because some strategies will fail if no stacks
# are deployed
routers = [v for v in topology.nodes() if v not in caches + sources + receivers]
# set weights and delays on all links
fnss.set_weights_constant(topology, 1.0)
fnss.set_delays_constant(topology, internal_link_delay, 'ms')
# randomly allocate contents to sources
contents = dict([(v, []) for v in sources])
for c in range(1, n_contents + 1):
s = choice(sources)
contents[s].append(c)
for v in sources:
fnss.add_stack(topology, v, 'source', {'contents': contents[v]})
for v in receivers:
fnss.add_stack(topology, v, 'receiver', {})
for v in routers:
fnss.add_stack(topology, v, 'router', {})
# label links as internal or external
for u, v in topology.edges():
if u in sources or v in sources:
topology.edge[u][v]['type'] = 'external'
# this prevents sources to be used to route traffic
fnss.set_weights_constant(topology, 1000.0, [(u, v)])
fnss.set_delays_constant(topology, external_link_delay, 'ms', [(u, v)])
else:
topology.edge[u][v]['type'] = 'internal'
for nc in net_cache:
size = (float(nc)*n_contents)/len(caches) # size of a single cache
C = str(nc)
for v in caches:
fnss.add_stack(topology, v, 'cache', {'size': size})
fnss.write_topology(topology, path.join(scenarios_dir, topo_prefix + 'T=%s@C=%s' % (T, C) + '.xml'))
print('[WROTE TOPOLOGY] T: %s, C: %s' % (T, C))
for a in alpha:
event_schedule = gen_req_schedule(receivers, rate, warmup, duration, n_contents, a)
fnss.write_event_schedule(event_schedule, path.join(scenarios_dir, es_prefix + 'T=%s@A=%s' % (T, str(a)) + '.xml'))
print('[WROTE SCHEDULE] T: %s, Alpha: %s, Events: %d' % (T, str(a), len(event_schedule)))
def test_weights_constant(self):
fnss.set_weights_constant(self.topo, 2, self.odd_links)
fnss.set_weights_constant(self.topo, 5, self.even_links)
self.assertTrue(all(self.topo.edge[u][v]['weight'] in [2, 5]
for (u, v) in self.topo.edges_iter()))
def scenario_garr(net_cache=[0.01, 0.05], n_contents=100000, alpha=[0.6, 0.8, 1.0]):
"""
Return a scenario based on GARR topology
Parameters
----------
scenario_id : str
String identifying the scenario (will be in the filename)
net_cache : float
Size of network cache (sum of all caches) normalized by size of content
population
n_contents : int
Size of content population
alpha : float
List of alpha of Zipf content distribution
"""
rate = 12.0
warmup = 9000
duration = 36000
T = 'GARR' # name of the topology
topology = fnss.parse_topology_zoo(path.join(scenarios_dir, 'resources/Garr201201.graphml')).to_undirected()
# sources are nodes representing neighbouring AS's
sources = [0, 2, 3, 5, 13, 16, 23, 24, 25, 27, 51, 52, 54]
# receivers are internal nodes with degree = 1
receivers = [1, 7, 8, 9, 11, 12, 19, 26, 28, 30, 32, 33, 41, 42, 43, 47, 48, 50, 53, 57, 60]
# caches are all remaining nodes --> 27 caches
caches = [n for n in topology.nodes() if n not in receivers + sources]
# set weights and delays on all links
fnss.set_weights_constant(topology, 1.0)
fnss.set_delays_constant(topology, internal_link_delay, 'ms')
# randomly allocate contents to sources
contents = dict([(v, []) for v in sources])
for c in range(1, n_contents + 1):
s = choice(sources)
contents[s].append(c)
for v in sources:
fnss.add_stack(topology, v, 'source', {'contents': contents[v]})
for v in receivers:
fnss.add_stack(topology, v, 'receiver', {})
# label links as internal or external
for u, v in topology.edges():
if u in sources or v in sources:
topology.edge[u][v]['type'] = 'external'
# this prevents sources to be used to route traffic
fnss.set_weights_constant(topology, 1000.0, [(u, v)])
fnss.set_delays_constant(topology, external_link_delay, 'ms',[(u, v)])
else:
topology.edge[u][v]['type'] = 'internal'
for nc in net_cache:
size = (float(nc)*n_contents)/len(caches) # size of a single cache
C = str(nc)
for v in caches:
fnss.add_stack(topology, v, 'cache', {'size': size})
fnss.write_topology(topology, path.join(scenarios_dir, topo_prefix + 'T=%s@C=%s' % (T, C) + '.xml'))
print('[WROTE TOPOLOGY] T: %s, C: %s' % (T, C))
for a in alpha:
event_schedule = gen_req_schedule(receivers, rate, warmup, duration, n_contents, a)
fnss.write_event_schedule(event_schedule, path.join(scenarios_dir, es_prefix + 'T=%s@A=%s' % (T, str(a)) + '.xml'))
print('[WROTE SCHEDULE] T: %s, Alpha: %s, Events: %d' % (T, str(a), len(event_schedule)))
def topology_single_cache(network_cache=0.05, n_contents=100000, seed=None):
"""
Return a scenario based on GEANT topology
Parameters
----------
network_cache : float
Size of network cache (sum of all caches) normalized by size of content
population
n_contents : int
Size of content population
seed : int, optional
The seed used for random number generation
Returns
-------
topology : fnss.Topology
The topology object
"""
# 240 nodes in the main component
#topology = fnss.parse_topology_zoo(path.join(TOPOLOGY_RESOURCES_DIR,
# 'Geant2012.graphml')
# ).to_undirected()
numnodes = 2
topology = fnss.topologies.simplemodels.line_topology(numnodes)
topology = nx.connected_component_subgraphs(topology)[0]
deg = nx.degree(topology)
nodes = topology.nodes()
#receivers = [v for v in topology.nodes() if deg[v] == 1] # 8 nodes
receivers = []
receivers.append(nodes[0])
#caches = [v for v in topology.nodes() if deg[v] > 2] # 19 nodes
caches = []
caches.append(nodes[1])
# attach sources to topology
#source_attachments = [v for v in topology.nodes() if deg[v] == 2] # 13 nodes
source_attachment = caches[0]
#sources = []
#for v in source_attachments:
# u = v + 1000 # node ID of source
# topology.add_edge(v, u)
# sources.append(u)
sources = []
u = source_attachment + 1000
sources.append(u)
topology.add_edge(source_attachment, sources[0])
#routers = [v for v in topology.nodes() if v not in caches + sources + receivers]
#router = nodes[1]
# randomly allocate contents to sources
#content_placement = uniform_content_placement(topology, range(1, n_contents+1), sources, seed=seed)
content_placement = uniform_content_placement(topology, range(1, n_contents+1), sources, seed=seed)
# add stacks to nodes
for v in sources:
fnss.add_stack(topology, v, 'source', {'contents': content_placement[v]})
for v in receivers:
fnss.add_stack(topology, v, 'receiver', {})
#fnss.add_stack(topology, source, 'source', {'contents': content_placement[source]})
#fnss.add_stack(topology, receiver, 'receiver', {})
#fnss.add_stack(topology, router, 'router', {})
# set weights and delays on all links
fnss.set_weights_constant(topology, 1.0)
fnss.set_delays_constant(topology, INTERNAL_LINK_DELAY, 'ms')
# label links as internal or external
for u, v in topology.edges_iter():
if u in sources or v in sources:
topology.edge[u][v]['type'] = 'external'
# this prevents sources to be used to route traffic
fnss.set_weights_constant(topology, 1000.0, [(u, v)])
fnss.set_delays_constant(topology, EXTERNAL_LINK_DELAY, 'ms', [(u, v)])
else:
topology.edge[u][v]['type'] = 'internal'
#topology.edge[source_attachment][source]['type'] = 'external'
#fnss.set_weights_constant(topology, 1000.0, [(source_attachment, source)])
#fnss.set_delays_constant(topology, external_link_delay, 'ms', [(source_attachment, source)])
#topology.edge[receiver][cache]['type'] = 'internal'
#topology.edge[router][cache]['type'] = 'internal'
# place caches
#cache_placement = uniform_cache_placement(topology, network_cache*n_contents, caches)
cache_placement = uniform_cache_placement(topology, network_cache*n_contents, caches)
for node, size in cache_placement.iteritems():
fnss.add_stack(topology, node, 'cache', {'size': size})
return topology