starpu-max/tests/microbenchs/redundant_buffer.c

/* StarPU --- Runtime system for heterogeneous multicore architectures.
 *
 * Copyright (C) 2009-2021  Université de Bordeaux, CNRS (LaBRI UMR 5800), Inria
 *
 * 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 <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <starpu.h>
#include <stdlib.h>
#include "../helper.h"

/*
 * Try passing the same buffer twice to the same task
 */

#define N	10000

#define VECTORSIZE	1024

starpu_data_handle_t v_handle;
static unsigned *v;

void func_codelet_null(void *descr[], void *_args)
{
	(void)descr;
	(void)_args;
}

static
struct starpu_codelet cl =
{
	.cpu_funcs = {func_codelet_null},
	.cuda_funcs = {func_codelet_null},
	.opencl_funcs = {func_codelet_null},
	.cpu_funcs_name = {"func_codelet_null"},
        .nbuffers = 2,
	.modes = {STARPU_R, STARPU_R}
};


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

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

	starpu_malloc((void **)&v, VECTORSIZE*sizeof(unsigned));

	starpu_vector_data_register(&v_handle, STARPU_MAIN_RAM, (uintptr_t)v, VECTORSIZE, sizeof(unsigned));

	unsigned iter;
	for (iter = 0; iter < N; iter++)
	{
		struct starpu_task *task = starpu_task_create();
		task->cl = &cl;

		task->handles[0] = v_handle;
		task->handles[1] = v_handle;

		ret = starpu_task_submit(task);
		if (ret == -ENODEV) goto enodev;
		STARPU_CHECK_RETURN_VALUE(ret, "starpu_task_submit");
	}

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

	starpu_data_unregister(v_handle);
	starpu_free_noflag(v, VECTORSIZE*sizeof(unsigned));
	starpu_shutdown();

	return EXIT_SUCCESS;

enodev:
	starpu_data_unregister(v_handle);
	starpu_free_noflag(v, VECTORSIZE*sizeof(unsigned));
	fprintf(stderr, "WARNING: No one can execute this task\n");
	/* yes, we do not perform the computation but we did detect that no one
 	 * could perform the kernel, so this is not an error from StarPU */
	starpu_shutdown();
	return STARPU_TEST_SKIPPED;
}