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))
class Receiver:
def __init__(self, *args):
if len(args) != 1: # Receiver actor expects 1 argument: its ID
raise AssertionError(
"Actor receiver requires 1 parameter, but got {:d}".format(len(args)))
self.mbox = Mailbox.by_name("receiver-{:s}".format(args[0]))
def __call__(self):
this_actor.info("Wait for my first message")
while True:
received = self.mbox.get()
this_actor.info("I got a '{:s}'.".format(received))
if received == "finalize":
break # If it's a finalize message, we're done.
if __name__ == '__main__':
e = Engine(sys.argv)
# Load the platform description
e.load_platform(sys.argv[1])
# Register the classes representing the actors
e.register_actor("sender", Sender)
e.register_actor("receiver", Receiver)
e.load_deployment(sys.argv[2])
e.run()
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))
if __name__ == '__main__':
e = Engine(sys.argv)
if len(sys.argv) < 2:
raise AssertionError(
"Usage: exec-dvfs.py platform_file [other parameters] (got {:d} params)"
.format(len(sys.argv)))
e.load_platform(sys.argv[1])
Actor.create("dvfs_test", Host.by_name("MyHost1"), Dvfs())
Actor.create("dvfs_test", Host.by_name("MyHost2"), Dvfs())
e.run()
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()))
from simgrid import Engine, this_actor
import sys
class Sleeper:
"""This actor just sleeps until termination"""
def __init__(self, *args):
# sys.exit(1); simgrid.info("Exiting now (done sleeping or got killed)."))
this_actor.on_exit(lambda: print("BAAA"))
def __call__(self):
this_actor.info("Hello! I go to sleep.")
this_actor.sleep_for(10)
this_actor.info("Done sleeping.")
if __name__ == '__main__':
e = Engine(sys.argv)
if len(sys.argv) < 2:
raise AssertionError(
"Usage: actor-lifetime.py platform_file actor-lifetime_d.xml [other parameters]"
)
e.load_platform(sys.argv[1]) # Load the platform description
e.register_actor("sleeper", Sleeper)
# Deploy the sleeper processes with explicit start/kill times
e.load_deployment(sys.argv[2])
e.run()
def load_platform():
""" Create a simple 1-host platform """
zone = NetZone.create_empty_zone("Zone1")
runner_host = zone.create_host("runner", 1e6)
runner_host.set_sharing_policy(
Host.SharingPolicy.NONLINEAR,
functools.partial(cpu_nonlinear, runner_host))
runner_host.seal()
zone.seal()
# create actor runner
Actor.create("runner", runner_host, runner)
if __name__ == '__main__':
e = Engine(sys.argv)
# create platform
load_platform()
# runs the simulation
e.run()
# 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)
# This serves as an example for the simgrid.yield() function, with which an actor can request
# to be rescheduled after the other actor that are ready at the current timestamp.
#
# It can also be used to benchmark our context-switching mechanism.
class Yielder:
"""Main function of the Yielder process"""
number_of_yields = 0
def __init__(self, *args):
self.number_of_yields = int(args[0])
def __call__(self):
for _ in range(self.number_of_yields):
this_actor.yield_()
this_actor.info("I yielded {:d} times. Goodbye now!".format(
self.number_of_yields))
if __name__ == '__main__':
e = Engine(sys.argv)
e.load_platform(sys.argv[1]) # Load the platform description
# Register the class representing the actors
e.register_actor("yielder", Yielder)
e.load_deployment(sys.argv[2])
e.run() # - Run the simulation
this_actor.sleep_for(1)
this_actor.info("Start a new actor, and kill it right away")
victim_c = Actor.create("victim C", Host.by_name("Jupiter"), victim_a_fun)
victim_c.kill()
this_actor.sleep_for(1)
this_actor.info("Killing everybody but myself")
Actor.kill_all()
this_actor.info("OK, goodbye now. I commit a suicide.")
this_actor.exit()
this_actor.info(
"This line never gets displayed: I'm already dead since the previous line.")
if __name__ == '__main__':
e = Engine(sys.argv)
if len(sys.argv) < 2:
raise AssertionError(
"Usage: actor-kill.py platform_file [other parameters]")
e.load_platform(sys.argv[1]) # Load the platform description
# Create and deploy killer process, that will create the victim actors
Actor.create("killer", Host.by_name("Tremblay"), killer)
e.run()
this_actor.sleep_for(5)
this_actor.info("Suspend again the lazy guy while he's sleeping...")
lazy.suspend()
this_actor.info("This time, don't let him finish his siesta.")
this_actor.sleep_for(2)
this_actor.info("Wake up, lazy guy!")
lazy.resume()
this_actor.sleep_for(5)
this_actor.info(
"Give a 2 seconds break to the lazy guy while he's working...")
lazy.suspend()
this_actor.sleep_for(2)
this_actor.info("Back to work, lazy guy!")
lazy.resume()
this_actor.info("OK, I'm done here.")
if __name__ == '__main__':
e = Engine(sys.argv)
if len(sys.argv) < 2:
raise AssertionError(
"Usage: actor-suspend.py platform_file [other parameters]")
e.load_platform(sys.argv[1]) # Load the platform description
hosts = e.get_all_hosts()
Actor.create("dream_master", hosts[0], dream_master)
e.run() # Run the simulation
import sys
from simgrid import Engine, this_actor
def sender():
this_actor.sleep_for(3)
this_actor.info("Goodbye now!")
def receiver():
this_actor.sleep_for(5)
this_actor.info("Five seconds elapsed")
if __name__ == '__main__':
e = Engine(sys.argv)
e.load_platform(sys.argv[1]) # Load the platform description
# Register the classes representing the actors
e.register_actor("sender", sender)
e.register_actor("receiver", receiver)
e.load_deployment(sys.argv[2])
e.run()
this_actor.info("Dummy import...")
import gc
gc.collect()
this_actor.info("done.")
Disk.SharingPolicy.LINEAR)
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
# Actors that are created as object will execute their __call__ method.
# So, the following constitutes the main function of the Sender actor.
def __call__(self):
this_actor.info("Hello s4u, I have something to send")
mailbox = Mailbox.by_name(self.mbox)
mailbox.put(self.msg, len(self.msg))
this_actor.info("I'm done. See you.")
if __name__ == '__main__':
# Here comes the main function of your program
# When your program starts, you have to first start a new simulation engine, as follows
e = Engine(sys.argv)
# Then you should load a platform file, describing your simulated platform
e.load_platform("../../platforms/small_platform.xml")
# And now you have to ask SimGrid to actually start your actors.
#
# The easiest way to do so is to implement the behavior of your actor in a single function,
# as we do here for the receiver actors. This function can take any kind of parameters, as
# long as the last parameters of Actor::create() match what your function expects.
Actor.create("receiver", Host.by_name("Fafard"), receiver, "mb42")
# If your actor is getting more complex, you probably want to implement it as a class instead,
# as we do here for the sender actors. The main behavior goes into operator()() of the class.
#
# You can then directly start your actor, as follows:
this_actor.execute(98095)
this_actor.info("Done.")
# This simple example does not do anything beyond that
def privileged():
# You can also specify the priority of your execution as follows.
# An execution of priority 2 computes twice as fast as a regular one.
#
# So instead of a half/half sharing between the two executions,
# we get a 1/3 vs 2/3 sharing.
this_actor.execute(98095, priority=2)
this_actor.info("Done.")
# Note that the timings printed when executing this example are a bit misleading,
# because the uneven sharing only last until the privileged actor ends.
# After this point, the unprivileged one gets 100% of the CPU and finishes
# quite quickly.
i = 0
if "--" in sys.argv:
i = sys.argv.index("--")
e = Engine(sys.argv[0:i])
e.load_platform(sys.argv[i + 1])
Actor.create("executor", Host.by_name("Tremblay"), executor)
Actor.create("privileged", Host.by_name("Tremblay"), privileged)
e.run()