X-Git-Url: http://bilbo.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/8db180ab71dc8057154417c17b5c9c006f91626a..3b56ba0e1914362b1c7e6b7d84bf72e2fe88f3c2:/examples/cpp/exec-ptask-multicore/s4u-exec-ptask-multicore.cpp

diff --git a/examples/cpp/exec-ptask-multicore/s4u-exec-ptask-multicore.cpp b/examples/cpp/exec-ptask-multicore/s4u-exec-ptask-multicore.cpp
index 1aeceb7a87..75f9701bbd 100644
--- a/examples/cpp/exec-ptask-multicore/s4u-exec-ptask-multicore.cpp
+++ b/examples/cpp/exec-ptask-multicore/s4u-exec-ptask-multicore.cpp
@@ -1,4 +1,4 @@
-/* Copyright (c) 2017-2021. The SimGrid Team. All rights reserved.          */
+/* Copyright (c) 2017-2023. 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. */
@@ -6,7 +6,6 @@
 #include <simgrid/s4u.hpp>
 
 XBT_LOG_NEW_DEFAULT_CATEGORY(s4u_ptask_multicore, "Messages specific for this s4u example");
-
 namespace sg4 = simgrid::s4u;
 
 static void runner()
@@ -24,13 +23,13 @@ static void runner()
   std::vector<sg4::Host*> monocore_hosts = {e->host_by_name("MyHost2"), e->host_by_name("MyHost2")};
   start_time                             = sg4::Engine::get_clock();
   sg4::this_actor::parallel_execute(monocore_hosts, comp, comm);
-  XBT_INFO("Computed 2-core activity one 1-core host. Took %g s", e->get_clock() - start_time);
+  XBT_INFO("Computed 2-core activity a 1-core host. Took %g s", e->get_clock() - start_time);
 
   // Same host, multicore.
   std::vector<sg4::Host*> multicore_host = {e->host_by_name("MyHost1"), e->host_by_name("MyHost1")};
   start_time                             = sg4::Engine::get_clock();
   sg4::this_actor::parallel_execute(multicore_host, comp, comm);
-  XBT_INFO("Computed 2-core activity on one 2-core host. Took %g s", e->get_clock() - start_time);
+  XBT_INFO("Computed 2-core activity on a 4-core host. Took %g s", e->get_clock() - start_time);
 
   // Same host, using too many cores
   std::vector<double> comp6(6, 1e9);
@@ -38,7 +37,47 @@ static void runner()
   std::vector<sg4::Host*> multicore_overload(6, e->host_by_name("MyHost1"));
   start_time = sg4::Engine::get_clock();
   sg4::this_actor::parallel_execute(multicore_overload, comp6, comm6);
-  XBT_INFO("Computed 6-core activity of a 4-core host. Took %g s", e->get_clock() - start_time);
+  XBT_INFO("Computed 6-core activity on a 4-core host. Took %g s", e->get_clock() - start_time);
+
+  // Same host, adding some communication
+  std::vector<double> comm2 = {0, 1E7, 1E7, 0};
+  start_time                = sg4::Engine::get_clock();
+  sg4::this_actor::parallel_execute(multicore_host, comp, comm2);
+  XBT_INFO("Computed 2-core activity on a 4-core host with some communication. Took %g s", e->get_clock() - start_time);
+
+  // See if the multicore execution continues to work after changing pstate
+  XBT_INFO("Switching machine multicore to pstate 1.");
+  e->host_by_name("MyHost1")->set_pstate(1);
+  XBT_INFO("Switching back to pstate 0.");
+  e->host_by_name("MyHost1")->set_pstate(0);
+
+  start_time = sg4::Engine::get_clock();
+  sg4::this_actor::parallel_execute(multicore_host, comp, comm);
+  XBT_INFO("Computed 2-core activity on a 4-core host. Took %g s", e->get_clock() - start_time);
+
+  start_time = sg4::Engine::get_clock();
+  sg4::this_actor::parallel_execute(hosts_diff, comp, comm);
+  XBT_INFO("Computed 2-core activity on two different hosts. Took %g s", e->get_clock() - start_time);
+
+  // Add a background task and change ptask on the fly
+  auto MyHost1                          = e->host_by_name("MyHost1");
+  sg4::ExecPtr background_task          = MyHost1->exec_async(5e9);
+  XBT_INFO("Start a 1-core background task on the 4-core host.");
+
+  start_time = sg4::Engine::get_clock();
+  sg4::this_actor::parallel_execute(multicore_host, comp, comm);
+  XBT_INFO("Computed 2-core activity on the 4-core host. Took %g s", e->get_clock() - start_time);
+  XBT_INFO("Remaining amount of work for the background task: %.0f%%",
+           100 * background_task->get_remaining_ratio());
+
+  XBT_INFO("Switching to pstate 1 while background task is still running.");
+  MyHost1->set_pstate(1);
+  start_time = sg4::Engine::get_clock();
+  sg4::this_actor::parallel_execute(multicore_host, comp, comm);
+  XBT_INFO("Computed again the same 2-core activity on it. Took %g s", e->get_clock() - start_time);
+
+  background_task->wait();
+  XBT_INFO("The background task has ended.");
 }
 
 int main(int argc, char* argv[])