# Copyright (c) 2017-2020. 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 demonstrate the actor migrations.
#
# The worker actor first move by itself, and then start an execution.
# During that execution, the monitor migrates the worker, that wakes up on another host.
# The execution was of the right amount of flops to take exactly 5 seconds on the first host
# and 5 other seconds on the second one, so it stops after 10 seconds.
#
# Then another migration is done by the monitor while the worker is suspended.
#
# Note that worker() takes an uncommon set of parameters,
# and that this is perfectly accepted by create().

from simgrid import Actor, Engine, Host, this_actor
import sys


def worker(first_host, second_host):
    flop_amount = first_host.speed * 5 + second_host.speed * 5

    this_actor.info("Let's move to {:s} to execute {:.2f} Mflops (5sec on {:s} and 5sec on {:s})".format(
        first_host.name, flop_amount / 1e6, first_host.name, second_host.name))

    this_actor.set_host(first_host)
    this_actor.execute(flop_amount)

    this_actor.info("I wake up on {:s}. Let's suspend a bit".format(
        this_actor.get_host().name))

    this_actor.suspend()

    this_actor.info("I wake up on {:s}".format(this_actor.get_host().name))
    this_actor.info("Done")


def monitor():
    boivin = Host.by_name("Boivin")
    jacquelin = Host.by_name("Jacquelin")
    fafard = Host.by_name("Fafard")

    actor = Actor.create("worker", fafard, worker, boivin, jacquelin)

    this_actor.sleep_for(5)

    this_actor.info(
        "After 5 seconds, move the process to {:s}".format(jacquelin.name))
    actor.host = jacquelin

    this_actor.sleep_until(15)
    this_actor.info(
        "At t=15, move the process to {:s} and resume it.".format(fafard.name))
    actor.host = fafard
    actor.resume()


if __name__ == '__main__':
    e = Engine(sys.argv)
    if len(sys.argv) < 2:
        raise AssertionError(
            "Usage: actor-migration.py platform_file [other parameters]")
    e.load_platform(sys.argv[1])

    Actor.create("monitor", Host.by_name("Boivin"), monitor)
    e.run()
