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# Copyright (c) 2006-2025. The SimGrid Team. All rights reserved.
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the license (GNU LGPL) which comes with this package.
"""
This example demonstrates how to create a variable load for tasks.
We consider the following graph:
comm -> exec
With a small load each comm task is followed by an exec task.
With a heavy load there is a burst of comm before the exec task can even finish once.
"""
from argparse import ArgumentParser
import sys
from simgrid import Engine, Task, CommTask, ExecTask, Actor, this_actor
def parse():
parser = ArgumentParser()
parser.add_argument(
'--platform',
type=str,
required=True,
help='path to the platform description'
)
return parser.parse_args()
def callback(t):
print(f'[{Engine.clock}] {t} finished ({t.get_count()})')
def variable_load(t):
print('--- Small load ---')
for _ in range(3):
t.enqueue_firings(1)
this_actor.sleep_for(100)
this_actor.sleep_for(1000)
print('--- Heavy load ---')
for _ in range(3):
t.enqueue_firings(1)
this_actor.sleep_for(1)
if __name__ == '__main__':
args = parse()
e = Engine(sys.argv)
e.load_platform(args.platform)
# Retrieve hosts
tremblay = e.host_by_name('Tremblay')
jupiter = e.host_by_name('Jupiter')
# Create tasks
comm = CommTask.init("comm", 1e7, tremblay, jupiter)
exec = ExecTask.init("exec", 1e9, jupiter)
# Create the graph by defining dependencies between tasks
comm.add_successor(exec)
# Add a function to be called when tasks end for log purpose
Task.on_completion_cb(callback)
# Create the actor that will inject load during the simulation
tremblay.add_actor("input", variable_load, comm)
# runs the simulation
e.run()
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