1 /* Copyright (c) 2010-2021. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
7 #include "simgrid/s4u.hpp"
10 #include <cstdio> /* snprintf */
12 XBT_LOG_NEW_DEFAULT_CATEGORY(msg_test, "Messages specific for this msg example");
14 static void master(std::vector<std::string> args)
16 xbt_assert(args.size() > 4, "The master function expects at least 3 arguments");
18 long tasks_count = std::stol(args[1]);
19 double compute_cost = std::stod(args[2]);
20 long communication_cost = std::stol(args[3]);
21 std::vector<simgrid::s4u::Mailbox*> workers;
22 for (unsigned int i = 4; i < args.size(); i++)
23 workers.push_back(simgrid::s4u::Mailbox::by_name(args[i]));
25 XBT_INFO("Got %zu workers and %ld tasks to process", workers.size(), tasks_count);
27 for (int i = 0; i < tasks_count; i++) { /* For each task to be executed: */
28 /* - Select a worker in a round-robin way */
29 simgrid::s4u::Mailbox* mailbox = workers[i % workers.size()];
31 /* - Send the computation cost to that worker */
32 XBT_INFO("Sending task %d of %ld to mailbox '%s'", i, tasks_count, mailbox->get_cname());
33 mailbox->put(new double(compute_cost), communication_cost);
36 XBT_INFO("All tasks have been dispatched. Request all workers to stop.");
37 for (unsigned int i = 0; i < workers.size(); i++) {
38 /* The workers stop when receiving a negative compute_cost */
39 simgrid::s4u::Mailbox* mailbox = workers[i % workers.size()];
41 mailbox->put(new double(-1.0), 0);
45 static void worker(std::vector<std::string> args)
47 xbt_assert(args.size() == 1, "The worker expects no argument");
49 const simgrid::s4u::Host* my_host = simgrid::s4u::this_actor::get_host();
50 simgrid::s4u::Mailbox* mailbox = simgrid::s4u::Mailbox::by_name(my_host->get_name());
54 auto msg = mailbox->get_unique<double>();
57 if (compute_cost > 0) /* If compute_cost is valid, execute a computation of that cost */
58 simgrid::s4u::this_actor::execute(compute_cost);
59 } while (compute_cost > 0); /* Stop when receiving an invalid compute_cost */
61 XBT_INFO("Exiting now.");
64 static void master_mpi(int argc, char* argv[])
66 MPI_Init(&argc, &argv);
69 MPI_Comm_rank(MPI_COMM_WORLD, &rank);
70 XBT_INFO("here for rank %d", rank);
71 std::array<int, 1000> test{{rank}};
73 MPI_Send(test.data(), 1000, MPI_INT, 1, 1, MPI_COMM_WORLD);
75 MPI_Recv(test.data(), 1000, MPI_INT, 0, 1, MPI_COMM_WORLD, MPI_STATUSES_IGNORE);
77 XBT_INFO("After comm %d", rank);
80 XBT_INFO("After finalize %d %d", rank, test[0]);
83 static void alltoall_mpi(int argc, char* argv[])
85 MPI_Init(&argc, &argv);
89 MPI_Comm_rank(MPI_COMM_WORLD, &rank);
90 MPI_Comm_size(MPI_COMM_WORLD, &size);
91 XBT_INFO("alltoall for rank %d", rank);
92 std::vector<int> out(1000 * size);
93 std::vector<int> in(1000 * size);
94 MPI_Alltoall(out.data(), 1000, MPI_INT, in.data(), 1000, MPI_INT, MPI_COMM_WORLD);
96 XBT_INFO("after alltoall %d", rank);
100 int main(int argc, char* argv[])
102 simgrid::s4u::Engine e(&argc, argv);
107 "Usage: %s platform_file deployment_file\n"
108 "\nexample: %s msg_platform.xml msg_deployment.xml\n",
111 e.load_platform(argv[1]);
113 e.register_function("master", master);
114 e.register_function("worker", worker);
115 // launch two MPI applications as well, one using master_mpi function as main on 2 nodes
116 SMPI_app_instance_register("master_mpi", master_mpi, 2);
117 // the second performing an alltoall on 4 nodes
118 SMPI_app_instance_register("alltoall_mpi", alltoall_mpi, 4);
119 e.load_deployment(argv[2]);
123 XBT_INFO("Simulation time %g", simgrid::s4u::Engine::get_clock());