def estimate_bw(disk: Disk, n_flows: int, read: bool):
""" Calculates the bandwidth for disk doing async operations """
size = 100000
cur_time = Engine.get_clock()
activities = [
disk.read_async(size) if read else disk.write_async(size)
for _ in range(n_flows)
]
for act in activities:
act.wait()
elapsed_time = Engine.get_clock() - cur_time
estimated_bw = float(size * n_flows) / elapsed_time
this_actor.info(
"Disk: %s, concurrent %s: %d, estimated bandwidth: %f" %
(disk.name, "read" if read else "write", n_flows, estimated_bw))
def __call__(self):
workload = 100E6
host = this_actor.get_host()
nb = host.get_pstate_count()
this_actor.info("Count of Processor states={:d}".format(nb))
this_actor.info("Current power peak={:f}".format(host.speed))
# Run a task
this_actor.execute(workload)
task_time = Engine.get_clock()
this_actor.info("Task1 duration: {:.2f}".format(task_time))
# Change power peak
new_pstate = 2
this_actor.info(
"Changing power peak value to {:f} (at index {:d})".format(
host.get_pstate_speed(new_pstate), new_pstate))
host.pstate = new_pstate
this_actor.info("Changed power peak={:f}".format(host.speed))
# Run a second task
this_actor.execute(workload)
task_time = Engine.get_clock() - task_time
this_actor.info("Task2 duration: {:.2f}".format(task_time))
# Verify that the default pstate is set to 0
host2 = Host.by_name("MyHost2")
this_actor.info("Count of Processor states={:d}".format(
host2.get_pstate_count()))
this_actor.info("Final power peak={:f}".format(host2.speed))
this_actor.info("Join the 3rd sleeper (timeout 2)")
actor.join(2)
this_actor.info("Start 4th sleeper")
actor = Actor.create("4th sleeper from master", Host.current(), sleeper)
this_actor.info("Waiting 4")
this_actor.sleep_for(4)
this_actor.info("Join the 4th sleeper after its end (timeout 1)")
actor.join(1)
this_actor.info("Goodbye now!")
this_actor.sleep_for(1)
this_actor.info("Goodbye now!")
if __name__ == '__main__':
e = Engine(sys.argv)
if len(sys.argv) < 2:
raise AssertionError(
"Usage: actor-join.py platform_file [other parameters]")
e.load_platform(sys.argv[1])
Actor.create("master", Host.by_name("Tremblay"), master)
e.run()
this_actor.info("Simulation time {}".format(Engine.get_clock()))
def create_sata_disk(host: Host, disk_name: str):
""" Same for a SATA disk, only read operation follows a non-linear resource sharing """
disk = host.create_disk(disk_name, "68MBps", "50MBps")
disk.set_sharing_policy(Disk.Operation.READ, Disk.SharingPolicy.NONLINEAR,
functools.partial(sata_dynamic_sharing, disk))
# this is the default behavior, expliciting only to make it clearer
disk.set_sharing_policy(Disk.Operation.WRITE, Disk.SharingPolicy.LINEAR)
disk.set_sharing_policy(Disk.Operation.READWRITE,
Disk.SharingPolicy.LINEAR)
if __name__ == '__main__':
e = Engine(sys.argv)
# simple platform containing 1 host and 2 disk
zone = NetZone.create_full_zone("bob_zone")
bob = zone.create_host("bob", 1e6)
create_ssd_disk(bob, "Edel (SSD)")
create_sata_disk(bob, "Griffon (SATA II)")
zone.seal()
Actor.create("runner", bob, host)
e.run()
this_actor.info("Simulated time: %g" % Engine.get_clock())
# explicitly deleting Engine object to avoid segfault during cleanup phase.
# During Engine destruction, the cleanup of std::function linked to non_linear callback is called.
# If we let the cleanup by itself, it fails trying on its destruction because the python main program
# has already freed its variables
del (e)