-/* Copyright (c) 2017. The SimGrid Team. All rights reserved. */
+/* Copyright (c) 2017-2018. 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().
+ */
+
#include <simgrid/s4u.hpp>
#include <simgrid/s4u/Mutex.hpp>
XBT_LOG_NEW_DEFAULT_CATEGORY(s4u_actor_migration, "Messages specific for this s4u example");
-simgrid::s4u::MutexPtr checkpoint = nullptr;
-simgrid::s4u::ConditionVariablePtr identification = nullptr;
-static simgrid::s4u::ActorPtr controlled_process = nullptr;
-
-/* The Emigrant process will be moved from host to host. */
-static void emigrant()
+static void worker(simgrid::s4u::Host* first, simgrid::s4u::Host* second)
{
- XBT_INFO("I'll look for a new job on another machine ('Boivin') where the grass is greener.");
- simgrid::s4u::this_actor::migrate(
- simgrid::s4u::Host::by_name("Boivin")); /* - First, move to another host by myself */
-
- XBT_INFO("Yeah, found something to do");
- simgrid::s4u::this_actor::execute(98095000);
- simgrid::s4u::this_actor::sleep_for(2);
+ double flopAmount = first->getSpeed() * 5 + second->getSpeed() * 5;
- XBT_INFO("Moving back home after work");
- simgrid::s4u::this_actor::migrate(simgrid::s4u::Host::by_name("Jacquelin")); /* - Move back to original location */
+ XBT_INFO("Let's move to %s to execute %.2f Mflops (5sec on %s and 5sec on %s)", first->get_cname(), flopAmount / 1e6,
+ first->get_cname(), second->get_cname());
- simgrid::s4u::this_actor::migrate(simgrid::s4u::Host::by_name("Boivin")); /* - Go back to the other host to sleep*/
- simgrid::s4u::this_actor::sleep_for(4);
+ simgrid::s4u::this_actor::migrate(first);
+ simgrid::s4u::this_actor::execute(flopAmount);
- checkpoint->lock(); /* - Get controlled at checkpoint */
- controlled_process = simgrid::s4u::Actor::self(); /* - and get moved back by the policeman process */
- identification->notify_all();
- checkpoint->unlock();
+ XBT_INFO("I wake up on %s. Let's suspend a bit", simgrid::s4u::this_actor::getHost()->get_cname());
simgrid::s4u::this_actor::suspend();
- XBT_INFO("I've been moved on this new host: %s", simgrid::s4u::this_actor::getHost()->getCname());
- XBT_INFO("Uh, nothing to do here. Stopping now");
+ XBT_INFO("I wake up on %s", simgrid::s4u::this_actor::getHost()->get_cname());
+ XBT_INFO("Done");
}
-/* The policeman check for emigrants and move them back to 'Jacquelin' */
-static void policeman()
+static void monitor()
{
- checkpoint->lock();
+ simgrid::s4u::Host* boivin = simgrid::s4u::Host::by_name("Boivin");
+ simgrid::s4u::Host* jacquelin = simgrid::s4u::Host::by_name("Jacquelin");
+ simgrid::s4u::Host* fafard = simgrid::s4u::Host::by_name("Fafard");
- XBT_INFO("Wait at the checkpoint."); /* - block on the mutex+condition */
- while (controlled_process == nullptr)
- identification->wait(checkpoint);
+ simgrid::s4u::ActorPtr actor = simgrid::s4u::Actor::create("worker", fafard, worker, boivin, jacquelin);
- controlled_process->migrate(simgrid::s4u::Host::by_name("Jacquelin")); /* - Move an emigrant to Jacquelin */
- XBT_INFO("I moved the emigrant");
- controlled_process->resume();
+ simgrid::s4u::this_actor::sleep_for(5);
- checkpoint->unlock();
+ XBT_INFO("After 5 seconds, move the process to %s", jacquelin->get_cname());
+ actor->migrate(jacquelin);
+
+ simgrid::s4u::this_actor::sleep_until(15);
+ XBT_INFO("At t=15, move the process to %s and resume it.", fafard->get_cname());
+ actor->migrate(fafard);
+ actor->resume();
}
int main(int argc, char* argv[])
{
simgrid::s4u::Engine e(&argc, argv);
xbt_assert(argc == 2, "Usage: %s platform_file\n\tExample: %s msg_platform.xml\n", argv[0], argv[0]);
- e.loadPlatform(argv[1]); /* - Load the platform description */
-
- /* - Create and deploy the emigrant and policeman processes */
- simgrid::s4u::Actor::createActor("emigrant", simgrid::s4u::Host::by_name("Jacquelin"), emigrant);
- simgrid::s4u::Actor::createActor("policeman", simgrid::s4u::Host::by_name("Boivin"), policeman);
+ e.loadPlatform(argv[1]);
- checkpoint = simgrid::s4u::Mutex::createMutex(); /* - Initiate the mutex and conditions */
- identification = simgrid::s4u::ConditionVariable::createConditionVariable();
+ simgrid::s4u::Actor::create("monitor", simgrid::s4u::Host::by_name("Boivin"), monitor);
e.run();
- XBT_INFO("Simulation time %g", e.getClock());
-
return 0;
}
