+++ /dev/null
-/* 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. */
-
-/* Parallel tasks are convenient abstractions of parallel computational kernels that span over several machines.
- * To create a new one, you have to provide several things:
- * - a vector of hosts on which the task will execute
- * - a vector of values, the amount of computation for each of the hosts (in flops)
- * - a matrix of values, the amount of communication between each pair of hosts (in bytes)
- *
- * Each of these operation will be processed at the same relative speed.
- * This means that at some point in time, all sub-executions and all sub-communications will be at 20% of completion.
- * Also, they will all complete at the exact same time.
- *
- * This is obviously a simplistic abstraction, but this is very handful in a large amount of situations.
- *
- * Please note that you must have the LV07 platform model enabled to use such constructs.
- */
-
-#include "simgrid/plugins/energy.h"
-#include <simgrid/s4u.hpp>
-
-XBT_LOG_NEW_DEFAULT_CATEGORY(s4u_energyptask, "Messages specific for this s4u example");
-
-static void runner()
-{
- /* Retrieve the list of all hosts as an array of hosts */
- std::vector<simgrid::s4u::Host*> hosts = simgrid::s4u::Engine::get_instance()->get_all_hosts();
- int hosts_count = hosts.size();
-
- XBT_INFO("First, build a classical parallel task, with 1 Gflop to execute on each node, "
- "and 10MB to exchange between each pair");
-
- std::vector<double> computation_amounts;
- std::vector<double> communication_amounts;
-
- /* ------[ test 1 ]----------------- */
- computation_amounts.assign(hosts.size(), 1e9 /*1Gflop*/);
- communication_amounts.assign(hosts.size() * hosts.size(), 0);
- for (int i = 0; i < hosts_count; i++)
- for (int j = i + 1; j < hosts_count; j++)
- communication_amounts[i * hosts_count + j] = 1e7; // 10 MB
-
- simgrid::s4u::this_actor::parallel_execute(hosts, computation_amounts, communication_amounts);
-
- /* ------[ test 2 ]----------------- */
- XBT_INFO("We can do the same with a timeout of one second enabled.");
- computation_amounts.assign(hosts.size(), 1e9 /*1Gflop*/);
- communication_amounts.assign(hosts.size() * hosts.size(), 0);
- for (int i = 0; i < hosts_count; i++)
- for (int j = i + 1; j < hosts_count; j++)
- communication_amounts[i * hosts_count + j] = 1e7; // 10 MB
-
- try {
- simgrid::s4u::this_actor::parallel_execute(hosts, computation_amounts, communication_amounts,
- 1.0 /* timeout (in seconds)*/);
- XBT_WARN("Woops, this did not timeout as expected... Please report that bug.");
- } catch (xbt_ex& e) {
- /* Do nothing this exception on timeout was expected */
- XBT_DEBUG("Caught expected exception: %s", e.what());
- }
-
- /* ------[ test 3 ]----------------- */
- XBT_INFO("Then, build a parallel task involving only computations and no communication (1 Gflop per node)");
- computation_amounts.assign(hosts.size(), 1e9 /*1Gflop*/);
- communication_amounts.clear(); /* no comm */
- simgrid::s4u::this_actor::parallel_execute(hosts, computation_amounts, communication_amounts);
-
- /* ------[ test 4 ]----------------- */
- XBT_INFO("Then, build a parallel task involving only heterogeneous computations and no communication");
- computation_amounts.resize(hosts.size());
- for (int i = 0; i < hosts_count; i++)
- computation_amounts[i] = 5 * (i + 1) * 1e8; // 500Mflop, 1Gflop, 1.5Gflop
- communication_amounts.clear(); /* no comm */
- simgrid::s4u::this_actor::parallel_execute(hosts, computation_amounts, communication_amounts);
-
- /* ------[ test 5 ]----------------- */
- XBT_INFO("Then, build a parallel task with no computation nor communication (synchro only)");
- computation_amounts.clear();
- communication_amounts.clear();
- simgrid::s4u::this_actor::parallel_execute(hosts, computation_amounts, communication_amounts);
-
- /* ------[ test 6 ]----------------- */
- XBT_INFO("Finally, trick the ptask to do a 'remote execution', on host %s", hosts[1]->get_cname());
- std::vector<simgrid::s4u::Host*> remote;
- remote.push_back(hosts[1]);
- computation_amounts.assign(1, 1e9);
- communication_amounts.clear();
-
- simgrid::s4u::this_actor::parallel_execute(remote, computation_amounts, communication_amounts);
-
- XBT_INFO("Goodbye now!");
-}
-
-int main(int argc, char* argv[])
-{
- simgrid::s4u::Engine e(&argc, argv);
-
- xbt_assert(argc <= 3, "1Usage: %s <platform file> [--energy]", argv[0]);
- xbt_assert(argc >= 2, "2Usage: %s <platform file> [--energy]", argv[0]);
-
- if (argc == 3 && argv[2][2] == 'e')
- sg_host_energy_plugin_init();
-
- e.load_platform(argv[1]);
-
- /* Pick a process, no matter which, from the platform file */
- simgrid::s4u::Actor::create("test", simgrid::s4u::Host::by_name("MyHost1"), runner);
-
- e.run();
- XBT_INFO("Simulation done.");
- return 0;
-}
