static int execute_load_test(int argc, char* argv[])
{
msg_host_t host = MSG_host_by_name("MyHost1");
XBT_INFO("Initial peak speed: %.0E flop/s; number of flops computed so far: %.0E (should be 0)",
MSG_host_get_speed(host), sg_host_get_computed_flops(host));
double start = MSG_get_clock();
XBT_INFO("Sleep for 10 seconds");
MSG_process_sleep(10);
XBT_INFO("Done sleeping %.2fs; peak speed: %.0E flop/s; number of flops computed so far: %.0E (nothing should have "
"changed)",
MSG_get_clock() - start, MSG_host_get_speed(host), sg_host_get_computed_flops(host));
// Run a task
start = MSG_get_clock();
msg_task_t task1 = MSG_task_create("t1", 100E6, 0, NULL);
XBT_INFO("Run a task of %.0E flops", MSG_task_get_flops_amount(task1));
MSG_task_execute(task1);
MSG_task_destroy(task1);
XBT_INFO("Done working on my task; this took %.2fs; current peak speed: %.0E flop/s; number of flops computed so "
"far: %.0E",
MSG_get_clock() - start, MSG_host_get_speed(host), sg_host_get_computed_flops(host));
// ========= Change power peak =========
int pstate = 2;
sg_host_set_pstate(host, pstate);
XBT_INFO("========= Requesting pstate %d (speed should be of %.0E flop/s and is of %.0E flop/s)", pstate,
MSG_host_get_power_peak_at(host, pstate), MSG_host_get_speed(host));
// Run a second task
start = MSG_get_clock();
task1 = MSG_task_create("t2", 100E6, 0, NULL);
XBT_INFO("Run a task of %.0E flops", MSG_task_get_flops_amount(task1));
MSG_task_execute(task1);
MSG_task_destroy(task1);
XBT_INFO("Done working on my task; this took %.2fs; current peak speed: %.0E flop/s; number of flops computed so "
"far: %.0E",
MSG_get_clock() - start, MSG_host_get_speed(host), sg_host_get_computed_flops(host));
start = MSG_get_clock();
XBT_INFO("========= Requesting a reset of the computation counter");
sg_host_load_reset(host);
XBT_INFO("Sleep for 4 seconds");
MSG_process_sleep(4);
XBT_INFO("Done sleeping %.2f s; peak speed: %.0E flop/s; number of flops computed so far: %.0E",
MSG_get_clock() - start, MSG_host_get_speed(host), sg_host_get_computed_flops(host));
// =========== Turn the other host off ==========
XBT_INFO("Turning MyHost2 off, and sleeping another 10 seconds. MyHost2 computed %.0f flops so far.",
MSG_host_get_computed_flops(MSG_host_by_name("MyHost2")));
MSG_host_off(MSG_host_by_name("MyHost2"));
start = MSG_get_clock();
MSG_process_sleep(10);
XBT_INFO("Done sleeping %.2f s; peak speed: %.0E flop/s; number of flops computed so far: %.0E",
MSG_get_clock() - start, MSG_host_get_speed(host), sg_host_get_computed_flops(host));
return 0;
}
static int dvfs(int argc, char* argv[])
{
double workload = 100E6;
msg_host_t host = MSG_host_self();
int nb = MSG_host_get_nb_pstates(host);
XBT_INFO("Count of Processor states=%d", nb);
double current_peak = MSG_host_get_speed(host);
XBT_INFO("Current power peak=%f", current_peak);
// Run a task
msg_task_t task1 = MSG_task_create("t1", workload, 0, NULL);
MSG_task_execute(task1);
MSG_task_destroy(task1);
double task_time = MSG_get_clock();
XBT_INFO("Task1 simulation time: %e", task_time);
// Change power peak
int new_pstate = 2;
xbt_assert(new_pstate < nb, "Cannot set the host %s at pstate %d because it only provides %d pstates.",
MSG_host_get_name(host), new_pstate, nb);
double peak_at = MSG_host_get_power_peak_at(host, new_pstate);
XBT_INFO("Changing power peak value to %f (at index %d)", peak_at, new_pstate);
MSG_host_set_pstate(host, new_pstate);
current_peak = MSG_host_get_speed(host);
XBT_INFO("Current power peak=%f", current_peak);
// Run a second task
task1 = MSG_task_create("t1", workload, 0, NULL);
MSG_task_execute(task1);
MSG_task_destroy(task1);
task_time = MSG_get_clock() - task_time;
XBT_INFO("Task2 simulation time: %e", task_time);
// Verify the default pstate is set to 0
host = MSG_host_by_name("MyHost2");
int nb2 = MSG_host_get_nb_pstates(host);
XBT_INFO("Count of Processor states=%d", nb2);
double current_peak2 = MSG_host_get_speed(host);
XBT_INFO("Current power peak=%f", current_peak2);
return 0;
}
