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/* Copyright (c) 2007-2025. 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/actor.h"
#include "simgrid/engine.h"
#include "simgrid/exec.h"
#include "simgrid/host.h"
#include "simgrid/plugins/energy.h"
#include "xbt/config.h"
#include "xbt/log.h"
#include "xbt/sysdep.h"
XBT_LOG_NEW_DEFAULT_CATEGORY(energy_exec_ptask, "Messages specific for this example");
static void runner(int argc, char* argv[])
{
/* Retrieve the list of all hosts as an array of hosts */
int host_count = (int)sg_host_count();
sg_host_t* hosts = sg_host_list();
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 = xbt_new0(double, host_count);
double* communication_amounts = xbt_new0(double, host_count * host_count);
for (int i = 0; i < host_count; i++)
computation_amounts[i] = 1e9; // 1 Gflop
for (int i = 0; i < host_count; i++)
for (int j = i + 1; j < host_count; j++)
communication_amounts[i * host_count + j] = 1e7; // 10 MB
sg_actor_parallel_execute(host_count, hosts, computation_amounts, communication_amounts);
xbt_free(communication_amounts);
xbt_free(computation_amounts);
XBT_INFO("We can do the same with a timeout of one second enabled.");
computation_amounts = xbt_new0(double, host_count);
communication_amounts = xbt_new0(double, host_count * host_count);
for (int i = 0; i < host_count; i++)
computation_amounts[i] = 1e9; // 1 Gflop
for (int i = 0; i < host_count; i++)
for (int j = i + 1; j < host_count; j++)
communication_amounts[i * host_count + j] = 1e7; // 10 MB
sg_exec_t exec = sg_actor_parallel_exec_init(host_count, hosts, computation_amounts, communication_amounts);
if (sg_exec_wait_for(exec, 1 /* timeout (in seconds)*/) == SG_ERROR_TIMEOUT)
sg_exec_cancel(exec);
xbt_free(communication_amounts);
xbt_free(computation_amounts);
XBT_INFO("Then, build a parallel task involving only computations and no communication (1 Gflop per node)");
computation_amounts = xbt_new0(double, host_count);
for (int i = 0; i < host_count; i++)
computation_amounts[i] = 1e9; // 1 Gflop
sg_actor_parallel_execute(host_count, hosts, computation_amounts, NULL);
xbt_free(computation_amounts);
XBT_INFO("Then, build a parallel task with no computation nor communication (synchro only)");
computation_amounts = xbt_new0(double, host_count);
communication_amounts = xbt_new0(double, host_count * host_count);
sg_actor_parallel_execute(host_count, hosts, computation_amounts, communication_amounts);
xbt_free(communication_amounts);
xbt_free(computation_amounts);
XBT_INFO("Finally, trick the ptask to do a 'remote execution', on host %s", sg_host_get_name(hosts[1]));
computation_amounts = xbt_new0(double, 1);
computation_amounts[0] = 1e9; // 1 Gflop
sg_host_t remote[1];
remote[0] = hosts[1];
sg_actor_parallel_execute(1, remote, computation_amounts, NULL /* no comm */);
xbt_free(computation_amounts);
XBT_INFO("Goodbye now!");
xbt_free(hosts);
}
int main(int argc, char* argv[])
{
simgrid_init(&argc, argv);
sg_cfg_set_string("host/model", "ptask_L07");
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();
simgrid_load_platform(argv[1]);
/* Pick the first host from the platform file */
sg_host_t* all_hosts = sg_host_list();
sg_host_t first_host = all_hosts[0];
xbt_free(all_hosts);
sg_actor_create("test", first_host, &runner, 0, NULL);
simgrid_run();
XBT_INFO("Simulation done.");
return 0;
}
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