def run(self):
# parameters
Sim.scheduler.reset()
Sim.set_debug('AppHandler')
Sim.set_debug('TCP')
# setup network
net = Network('../networks/setup.txt')
net.loss(self.loss)
# setup routes
n1 = net.get_node('n1')
n2 = net.get_node('n2')
n1.add_forwarding_entry(address=n2.get_address('n1'), link=n1.links[0])
n2.add_forwarding_entry(address=n1.get_address('n2'), link=n2.links[0])
# setup transport
t1 = Transport(n1)
t2 = Transport(n2)
# setup application
a = AppHandler(self.filename, self.out_directory)
# setup connection
c1 = TCP(t1,
n1.get_address('n2'),
1,
n2.get_address('n1'),
1,
a,
window=self.window)
c2 = TCP(t2,
n2.get_address('n1'),
1,
n1.get_address('n2'),
1,
a,
window=self.window)
# send a file
with open(self.in_directory + '/' + self.filename, 'r') as f:
while True:
data = f.read(10000)
if not data:
break
Sim.scheduler.add(delay=0, event=data, handler=c1.send)
# run the simulation
Sim.scheduler.run()
# print str(self.window) + " & " + \
# str(Sim.scheduler.current_time()) + " & " + \
# str(4116160.0 / float(Sim.scheduler.current_time())) + " & " + \
# str(c2.totalQueueingDelay / float(c1.totalPacketsSent)) + " \\\\"
# print str(self.window) + "," + str(4116160.0 / float(Sim.scheduler.current_time()))
print str(self.window) + "," + str(
c2.totalQueueingDelay / float(c1.totalPacketsSent))
def run(self):
# parameters
Sim.scheduler.reset()
if hasattr(self, 'debug') and "a" in self.debug:
Sim.set_debug('AppHandler')
if hasattr(self, 'debug') and "t" in self.debug:
Sim.set_debug('TCP')
# setup network
net = Network('networks/one-hop.txt')
net.loss(self.loss)
# setup routes
n1 = net.get_node('n1')
n2 = net.get_node('n2')
n1.add_forwarding_entry(address=n2.get_address('n1'),link=n1.links[0])
n2.add_forwarding_entry(address=n1.get_address('n2'),link=n2.links[0])
# setup transport
t1 = Transport(n1)
t2 = Transport(n2)
# setup application
a = AppHandler(self.filename)
# setup connection
c1 = TCP(t1,n1.get_address('n2'),1,n2.get_address('n1'),1,a,dynamic_rto=self.dynamic_rto)
c2 = TCP(t2,n2.get_address('n1'),1,n1.get_address('n2'),1,a,dynamic_rto=self.dynamic_rto)
f = open(self.filename, "rb")
try:
data = f.read(1000)
while data != "":
Sim.scheduler.add(delay=0, event=data, handler=c1.send)
data = f.read(1000)
finally:
f.close()
# run the simulation
Sim.scheduler.run()
def __init__(self,transport,source_address,source_port,
destination_address,destination_port,app=None,window=1000):
Connection.__init__(self,transport,source_address,source_port,
destination_address,destination_port,app)
### Sender functionality
self.totalQueueingDelay = 0.0
self.totalPacketsSent = 0
self.port = source_port
self.dynamic = True
self.output = False
self.proveTimer = False
self.proveCong = False
self.stand_trace = False
self.seq_plot = False
self.graph1 = True
self.graph2 = False # == This is controlled in the transfer file by Sim.set_debug('Link')
self.graph3 = False
self.graph4 = False
if self.graph2:
Sim.set_debug('Link')
# send window; represents the total number of bytes that may
# be outstanding at one time
# maximum segment size, in bytes
self.mss = 1000
# Step 2
self.window = self.mss ######################### This one gets the mess adjusted out of it
# threshold for slow start
self.thresh = 100000
self.inc_sum = 0
# for fast retransmit
self.last_ack = 0
self.dup_counter = 0
self.drop_next = False
self.has_dropped = False
self.dropped_count = 0
# send buffer
self.send_buffer = SendBuffer()
############################################# (this never gets adjusted)
#self.mss = min(1000, window) ################ TODO: handle the case where window is bigger than mss
# largest sequence number that has been ACKed so far; represents
# the next sequence number the client expects to receive
self.sequence = 0
# retransmission timer
self.timer = None
# timeout duration in seconds
self.timeout = 1.0
if self.dynamic:
self.timeout = 3.0
# estimated rtt
self.est_rtt = None
# alpha
self.alpha = 0.125
# variation rtt
self.var_rtt = None ## TODO: revisit this later
# beta
self.beta = 0.25
### Receiver functionality
# receive buffer
self.receive_buffer = ReceiveBuffer()
# ack number to send; represents the largest in-order sequence
# number not yet received
self.ack = 0
def __init__(self,transport,source_address,source_port,destination_address,destination_port,app=None):
Connection.__init__(self,transport,source_address,source_port, destination_address,destination_port,app)
### RTO Timer Properties
self.rtt_initialized = False
self.rto = None
self.srtt = None
self.rttvar = None
self.K = 4
self.initialize_timer()
# RTT Cap Seconds
self.max_rtt = 60
self.min_rtt = 1
self.alpha = 0.125
self.beta = 0.25
### Sender functionality
self.transmission_finished = False
# send buffer
self.send_buffer = SendBuffer()
# maximum segment size, in bytes
self.mss = 1000
# send window; represents the total number of bytes that may
# be outstanding at one time
self.window = self.mss
# largest sequence number that has been ACKed so far; represents
# the next sequence number the client expects to receive
self.sequence = 0
# retransmission timer
self.timer = None
# timeout duration in seconds
self.timeout = 1
# is_retransmitting prevents more duplicate ACKs from triggering another send.
self.is_retransmitting = False
self.force_drop = True
### Congestion Control
self.restarting_slow_start = False
self.threshold = 16000
self.additive_increase_total = 0
# Fast Retransmit ACKs
self.retransmit_acks = [-1] * 3
### Receiver functionality
# receive buffer
self.receive_buffer = ReceiveBuffer()
# ack number to send; represents the largest in-order sequence
# number not yet received
self.ack = 0
### Testing
self.is_aiad = False
### FILE WRITING
self.write_to_disk = True
self.plot_port_number = 2
self.plot_sequence_on = False
self.plot_rate_on = True
self.plot_queue_on = False
self.plot_window_on = False
file_name = "output.txt"
header_message = "## header message ##"
if self.plot_sequence_on:
file_name = "sequence_plot.txt"
header_message = "# Time (seconds) Sequence (number) Dropped (0 or 1) ACK (0 or 1)"
Sim.set_debug("Link")
elif self.plot_rate_on:
file_name = "rate_plot.txt"
header_message = "# Time (seconds) Size (number)"
elif self.plot_queue_on:
file_name = "queue_plot.txt"
header_message = "# Time (seconds) Queue Size (bytes)"
Sim.set_debug("Queue")
elif self.plot_window_on:
file_name = "window_plot.txt"
header_message = "# Time (seconds) Congestion Window Size (bytes)"
if self.write_to_disk:
file_title,file_extension = file_name.split('.')
new_file_name = file_title + str(self.plot_port_number) + '.' + file_extension
self.trace("PRINTING TO: %s" % new_file_name)
sys.stdout = open(new_file_name, 'w')
print header_message
def trace_on():
Sim.set_debug("Node")
Sim.set_debug("Link")
trace_on()
simple_send(nodes, 0, 'n4', 11, 'n5', 0)
# p = packet.Packet(source_address=nodes[0].get_address('n4'),destination_address=nodes[11].get_address('n5'),ident=1,length=100)
# Sim.scheduler.add(delay=0, event=p, handler=nodes[0].send_packet)
run()
def print_tables(nodes, apps):
print "==============================="
for i in range(0, len(nodes)):
print "Final DV for " + str(nodes[i].hostname) + ": " + str(
apps[i].dist_vector)
print "==============================="
for i in range(0, len(nodes)):
print "Final forwarding table for " + str(
nodes[i].hostname) + ": " + str(apps[i].pretty_ft())
if __name__ == '__main__':
Sim.scheduler.reset()
Sim.set_debug("DVR")
# five_node_line_exp()
five_node_ring_exp()
# fifteen_nodes_exp()