starpu-max/tests/perfmodels/regression_based_03.c

/* StarPU --- Runtime system for heterogeneous multicore architectures.
 *
 * Copyright (C) 2011,2012,2014                           Inria
 * Copyright (C) 2011-2016,2019                           Université de Bordeaux
 * Copyright (C) 2011-2017                                CNRS
 * Copyright (C) 2011                                     Télécom-SudParis
 *
 * StarPU is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or (at
 * your option) any later version.
 *
 * StarPU is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *
 * See the GNU Lesser General Public License in COPYING.LGPL for more details.
 */

#include <starpu.h>
#include <starpu_scheduler.h>
#include "../helper.h"

/*
 * A multi-implementation benchmark with dmda scheduler
 * we aim to test the energy model with the different size of gamma
 * for large size of gamma, dmda choose the second implementation which consumes less energy
 * otherwise, it choose the first implementtaion which minimizes the execution time
 */

#define STARTlin 1048576
#define START 1024
#ifdef STARPU_QUICK_CHECK
#define END 1048576
#else
#define END 16777216
#endif


int ret;

//1er implémentation avec un delai initial (100 us)
void memset0_cpu(void *descr[], void *arg)
{
    (void)arg;
    STARPU_SKIP_IF_VALGRIND;

    int *ptr = (int *)STARPU_VECTOR_GET_PTR(descr[0]);
    unsigned n = STARPU_VECTOR_GET_NX(descr[0]);
    int i;

    //usleep () function
    usleep(100);

    for (i=0; i<n ; i++)
    {
        ptr[0] += i;
    }
}

//deuxième implémentation sans delai initial usleep() et fait 2.5 plus de tours de boucles
void memset_cpu(void *descr[], void *arg)
{
    (void)arg;
    STARPU_SKIP_IF_VALGRIND;

    int *ptr = (int *)STARPU_VECTOR_GET_PTR(descr[0]);
    unsigned n = STARPU_VECTOR_GET_NX(descr[0]);
    int i;

    for (i=0; i<6.5*n ; i++)
    {
        ptr[0] += i;
    }
}

//fonction pour mesurer l'energie
double energy_function(struct starpu_task *task, struct starpu_perfmodel_arch *arch, unsigned nimpl)

{
    double energy;
    int factor;
    if (nimpl == 0)
        factor = 10;
    else
        factor = 1;

    energy=starpu_task_expected_length(task, arch, nimpl)*factor;

    return energy;
}

static struct starpu_perfmodel model =
{
    .type = STARPU_REGRESSION_BASED,
    .symbol = "memset_regression_based"
};

static struct starpu_perfmodel nl_model =
{
    .type = STARPU_NL_REGRESSION_BASED,
    .symbol = "non_linear_memset_regression_based"
};

static struct starpu_perfmodel nl_energy_model=
{
    .type = STARPU_PER_ARCH,
    .symbol = "non_linear_energy_model",
    .arch_cost_function={energy_function},
};

static struct starpu_codelet memset_cl =
{
    .cpu_funcs = {memset0_cpu, memset_cpu},
    .cpu_funcs_name = {"memset0_cpu", "memset_cpu"},
    .model = &model,
    .nbuffers = 1,
    .modes = {STARPU_W}
};

static struct starpu_codelet nl_memset_cl =
{
    .cpu_funcs = {memset0_cpu, memset_cpu},
    .cpu_funcs_name = {"memset0_cpu", "memset_cpu"},
    .model = &nl_model,
    .energy_model = &nl_energy_model,
    .nbuffers = 1,
    .modes = {STARPU_W}
};

static void test_memset(int nelems, struct starpu_codelet *codelet)
{
    int nloops = 100;
    int loop;
    starpu_data_handle_t handle;

    starpu_vector_data_register(&handle, -1, (uintptr_t)NULL, nelems, sizeof(int));
    for (loop = 0; loop < nloops; loop++)
    {
        struct starpu_task *task = starpu_task_create();

        task->cl = codelet;
        task->handles[0] = handle;

        int ret = starpu_task_submit(task);
        if (ret == -ENODEV)
            exit(STARPU_TEST_SKIPPED);
        STARPU_CHECK_RETURN_VALUE(ret, "starpu_task_submit");
    }

    starpu_data_unregister(handle);
}

static void compare_performance(int size, struct starpu_codelet *codelet, struct starpu_task *task)
{
    unsigned i;
    int niter = 100;
    starpu_data_handle_t handle;

    starpu_vector_data_register(&handle, -1, (uintptr_t)NULL, size, sizeof(int));

    struct starpu_task **tasks = (struct starpu_task **) malloc(niter*sizeof(struct starpu_task *));
    assert(tasks);

    for (i = 0; i < niter; i++)
    {
        //fabriquer la tache
        struct starpu_task *task = starpu_task_create();

        task->cl = codelet;
        task->handles[0] = handle;

        task->synchronous = 1;

        /* We will destroy the task structure by hand so that we can
         * query the profiling info before the task is destroyed. */
        task->destroy = 0;

        tasks[i] = task;

        //soumettre la tache
        ret = starpu_task_submit(task);

        if (STARPU_UNLIKELY(ret == -ENODEV))
        {
            FPRINTF(stderr, "No worker may execute this task\n");
            exit(0);
        }
    }

    starpu_data_unregister(handle);

    starpu_task_wait_for_all();

    double length_sum = 0.0;

    for (i = 0; i < niter; i++)
    {
        struct starpu_task *task = tasks[i];

        struct starpu_profiling_task_info *info = task->profiling_info;


        /* How long was the task execution ? */
        length_sum += starpu_timing_timespec_delay_us(&info->start_time, &info->end_time);

        /* We don't need the task structure anymore */
        starpu_task_destroy(task);
    }


    /* Display the occupancy of all workers during the test */
    unsigned worker;
    for (worker = 0; worker < starpu_worker_get_count(); worker++)
    {
        struct starpu_profiling_worker_info worker_info;
        ret = starpu_profiling_worker_get_info(worker, &worker_info);
        STARPU_ASSERT(!ret);

        char workername[128];
        starpu_worker_get_name(worker, workername, sizeof(workername));
        unsigned nimpl;

        if (starpu_worker_get_type(worker)==STARPU_CPU_WORKER)
        {
            FPRINTF(stdout, "\n Worker :%s ::::::::::\n\n", workername);

            for (nimpl = 0; nimpl < STARPU_MAXIMPLEMENTATIONS; nimpl++)
            {

                FPRINTF(stdout, "Expected time for %d on %s (impl %u): %f, Measured time: %f, Expected energy: %f\n",
                        size, workername, nimpl,starpu_task_expected_length(task, starpu_worker_get_perf_archtype(worker, task->sched_ctx), nimpl), ((length_sum)/niter),
                        starpu_task_expected_energy(task, starpu_worker_get_perf_archtype(worker, task->sched_ctx), nimpl));
            }
        }
    }


}


int main(int argc, char **argv)
{

    /* Enable profiling */
    starpu_profiling_status_set(1);

    struct starpu_conf conf;
    starpu_data_handle_t handle;
    int ret;

    starpu_conf_init(&conf);

    conf.sched_policy_name = "dmda";
    conf.calibrate = 2;

    ret = starpu_initialize(&conf, &argc, &argv);
    if (ret == -ENODEV) return STARPU_TEST_SKIPPED;
    STARPU_CHECK_RETURN_VALUE(ret, "starpu_init");

    int size;
    for (size = STARTlin; size < END; size *= 2)
    {
        /* Use a linear regression */
        test_memset(size, &memset_cl);
    }

    for (size = START; size < END; size *= 2)
    {
        /* Use a non-linear regression */
        test_memset(size, &nl_memset_cl);
    }

    ret = starpu_task_wait_for_all();
    STARPU_CHECK_RETURN_VALUE(ret, "starpu_task_wait_for_all");

    starpu_shutdown();


    /* Test Phase */
    starpu_conf_init(&conf);

    conf.sched_policy_name = "dmda";
    conf.calibrate = 0;

    ret = starpu_initialize(&conf, &argc, &argv);
    if (ret == -ENODEV) return STARPU_TEST_SKIPPED;
    STARPU_CHECK_RETURN_VALUE(ret, "starpu_init");

    /* Now create a dummy task just to estimate its duration according to the regression */

    size = 1234567;

    starpu_vector_data_register(&handle, -1, (uintptr_t)NULL, size, sizeof(int));

    struct starpu_task *task = starpu_task_create();
    task->cl = &memset_cl;
    task->handles[0] = handle;
    task->destroy = 0;

    task->cl = &nl_memset_cl;

    FPRINTF(stdout, "\n ////non linear regression results////\n");

    compare_performance(size, &nl_memset_cl,task);

    starpu_task_destroy(task);

    starpu_data_unregister(handle);

    starpu_shutdown();

    return EXIT_SUCCESS;
}