X-Git-Url: http://bilbo.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/d302716a88c3b53523cf376b36de4956e5976918..9853c047276b618315bd3f064c1f13c3d3ccd771:/examples/s4u/exec-ptask/s4u-exec-ptask.cpp diff --git a/examples/s4u/exec-ptask/s4u-exec-ptask.cpp b/examples/s4u/exec-ptask/s4u-exec-ptask.cpp index 267be8c7db..146753eb11 100644 --- a/examples/s4u/exec-ptask/s4u-exec-ptask.cpp +++ b/examples/s4u/exec-ptask/s4u-exec-ptask.cpp @@ -1,90 +1,87 @@ -/* Copyright (c) 2017. The SimGrid Team. All rights reserved. */ +/* Copyright (c) 2017-2019. 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. */ -#include "simgrid/plugins/energy.h" +/* 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 -#include -#include -XBT_LOG_NEW_DEFAULT_CATEGORY(s4u_energyptask, "Messages specific for this s4u example"); +XBT_LOG_NEW_DEFAULT_CATEGORY(s4u_ptask, "Messages specific for this s4u example"); static void runner() { /* Retrieve the list of all hosts as an array of hosts */ - int hosts_count = sg_host_count(); - simgrid::s4u::Host** hosts = sg_host_list(); + auto hosts = simgrid::s4u::Engine::get_instance()->get_all_hosts(); + size_t 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"); - double* computation_amounts = new double[hosts_count](); - double* communication_amounts = new double[hosts_count * hosts_count](); - for (int i = 0; i < hosts_count; i++) - computation_amounts[i] = 1e9; // 1 Gflop + std::vector computation_amounts; + std::vector communication_amounts; - for (int i = 0; i < hosts_count; i++) - for (int j = i + 1; j < hosts_count; j++) + /* ------[ test 1 ]----------------- */ + computation_amounts.assign(hosts_count, 1e9 /*1Gflop*/); + communication_amounts.assign(hosts_count * hosts_count, 0); + for (size_t i = 0; i < hosts_count; i++) + for (size_t j = i + 1; j < hosts_count; j++) communication_amounts[i * hosts_count + j] = 1e7; // 10 MB - simgrid::s4u::this_actor::parallel_execute(hosts_count, hosts, computation_amounts, communication_amounts); - - XBT_INFO("We can do the same with a timeout of one second enabled."); - computation_amounts = new double[hosts_count](); - communication_amounts = new double[hosts_count * hosts_count](); + simgrid::s4u::this_actor::parallel_execute(hosts, computation_amounts, communication_amounts); - for (int i = 0; i < hosts_count; i++) - computation_amounts[i] = 1e9; // 1 Gflop - - for (int i = 0; i < hosts_count; i++) - for (int j = i + 1; j < hosts_count; j++) + /* ------[ test 2 ]----------------- */ + XBT_INFO("We can do the same with a timeout of 10 seconds enabled."); + computation_amounts.assign(hosts_count, 1e9 /*1Gflop*/); + communication_amounts.assign(hosts_count * hosts_count, 0); + for (size_t i = 0; i < hosts_count; i++) + for (size_t j = i + 1; j < hosts_count; j++) communication_amounts[i * hosts_count + j] = 1e7; // 10 MB try { - simgrid::s4u::this_actor::parallel_execute(hosts_count, 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()); + simgrid::s4u::this_actor::parallel_execute(hosts, computation_amounts, communication_amounts, + 10.0 /* timeout (in seconds)*/); + xbt_die("Woops, this did not timeout as expected... Please report that bug."); + } catch (const simgrid::TimeoutException&) { + XBT_INFO("Caught the expected timeout exception."); } - XBT_INFO("Then, build a parallel task involving only computations and no communication (1 Gflop per node)"); - computation_amounts = new double[hosts_count](); - for (int i = 0; i < hosts_count; i++) - computation_amounts[i] = 1e9; // 1 Gflop - simgrid::s4u::this_actor::parallel_execute(hosts_count, hosts, computation_amounts, nullptr /* no comm */); + /* ------[ test 3 ]----------------- */ + XBT_INFO("Then, build a parallel task involving only computations (of different amounts) and no communication"); + computation_amounts = {3e8, 6e8, 1e9}; // 300Mflop, 6Mflop, 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 with no computation nor communication (synchro only)"); - computation_amounts = new double[hosts_count](); - communication_amounts = new double[hosts_count * hosts_count](); - simgrid::s4u::this_actor::parallel_execute(hosts_count, hosts, computation_amounts, communication_amounts); - - XBT_INFO("Finally, trick the ptask to do a 'remote execution', on host %s", hosts[1]->getCname()); - computation_amounts = new double[1]{1e9}; - - simgrid::s4u::Host* remote[] = {hosts[1]}; - simgrid::s4u::this_actor::parallel_execute(1, remote, computation_amounts, nullptr); + computation_amounts.clear(); + communication_amounts.clear(); + simgrid::s4u::this_actor::parallel_execute(hosts, computation_amounts, communication_amounts); XBT_INFO("Goodbye now!"); - std::free(hosts); } int main(int argc, char* argv[]) { simgrid::s4u::Engine e(&argc, argv); - xbt_assert(argc <= 3, "1Usage: %s [--energy]", argv[0]); - xbt_assert(argc >= 2, "2Usage: %s [--energy]", argv[0]); - - if (argc == 3 && argv[2][2] == 'e') - sg_host_energy_plugin_init(); - - e.loadPlatform(argv[1]); + xbt_assert(argc == 2, "Usage: %s ", argv[0]); - /* Pick a process, no matter which, from the platform file */ - simgrid::s4u::Actor::createActor("test", simgrid::s4u::Host::by_name("MyHost1"), runner); + e.load_platform(argv[1]); + simgrid::s4u::Actor::create("test", simgrid::s4u::Host::by_name("MyHost1"), runner); e.run(); XBT_INFO("Simulation done.");