def describe_simulation_scenario():
""" Describes the simulation scenario with all created objects and its relationships
"""
occupation_rate = 0
for server in Server.all():
occupation_rate += server.occupation_rate()
occupation_rate = occupation_rate / Server.count()
print(f'DATASET NAME: {OUTPUT_FILE_NAME}.json')
print(f'DATA CENTER OCCUPATION: {round(occupation_rate)}% ({occupation_rate})')
def create_servers():
""" Creates Server objects according to user-specified parameters.
"""
for _ in range(SERVERS):
# Creating object
server = Server(id=None, cpu=None, memory=None, disk=None, updated=None)
# Defining values for the object attributes
server.id = Server.count()
server.cpu_capacity = SERVERS_CAPACITY[0][0]
server.memory_capacity = SERVERS_CAPACITY[0][1]
server.disk_capacity = SERVERS_CAPACITY[0][2]
server.updated = SERVERS_UPDATE_STATUS[0]
server.patch_duration = SERVERS_PATCH_DURATION[0][0]
server.sanity_check_duration = SERVERS_PATCH_DURATION[0][1]
# Updating attribute lists after the object is created
SERVERS_CAPACITY.pop(0)
SERVERS_UPDATE_STATUS.pop(0)
SERVERS_PATCH_DURATION.pop(0)
def show_metrics(dataset, heuristic, output_file=None):
""" Presents information and metrics of the performed placement
and optionally stores these results into an output CSV file.
Currently, this method outputs the following metrics:
- Servers occupation rate
- Servers consolidation rate
Parameters
==========
dataset : String
Name of the used dataset
heuristic : STring
Name of the used placement heuristic
output_file : String
Optional parameters regarding the name of the output CSV file
"""
# Servers occupation rate
occupation_rate = sum(sv.occupation_rate()
for sv in Server.all()) / len(Server.used_servers())
# Servers consolidation rate
consolidation_rate = Server.consolidation_rate()
# Prints out the placement metrics
print(
'========================\n== SIMULATION RESULTS ==\n========================'
)
print(f'Dataset: "{dataset}"')
print(f'Placement Strategy: {heuristic}\n')
print(f'Consolidation Rate: {consolidation_rate}')
print(f'Occupation Rate: {occupation_rate}\n')
print('Placement:')
for server in Server.all():
vms = [vm.id for vm in server.virtual_machines]
print(f'SV_{server.id}. VMs: {vms}')
# If the output_file parameter was provided, stores the placement results into a CSV file
if output_file:
with open(output_file, mode='w') as csv_file:
output_writer = csv.writer(csv_file,
delimiter='\t',
quotechar='"',
quoting=csv.QUOTE_MINIMAL)
# Creating header
output_writer.writerow([
'Dataset', 'Strategy', 'No. of Servers', 'No. of VMs',
'Occupation Rate', 'Consolidation Rate'
])
# Creating body
output_writer.writerow([
dataset, heuristic,
Server.count(),
VirtualMachine.count(), occupation_rate, consolidation_rate
])