starpu-max/tests/datawizard/in_place_partition.c

/* StarPU --- Runtime system for heterogeneous multicore architectures.
 *
 * Copyright (C) 2011-2021  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 <starpu.h>
#include "../helper.h"
#include "scal.h"

/*
 * Trigger in-place partitioning by prefetching the whole data before
 * partitioning
 */

int main(int argc, char **argv)
{
	unsigned *foo;
	starpu_data_handle_t handle;
	int ret;
	unsigned n, i, size;

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

#ifdef STARPU_USE_OPENCL
	ret = starpu_opencl_load_opencl_from_file("tests/datawizard/scal_opencl.cl", &opencl_program, NULL);
	STARPU_CHECK_RETURN_VALUE(ret, "starpu_opencl_load_opencl_from_file");
#endif

	n = starpu_worker_get_count();
	if (n == 1)
	{
		starpu_shutdown();
		return STARPU_TEST_SKIPPED;
	}

	size = 10 * n;

	foo = (unsigned *) calloc(size, sizeof(*foo));
	for (i = 0; i < size; i++)
		foo[i] = i;

	starpu_vector_data_register(&handle, STARPU_MAIN_RAM, (uintptr_t)foo, size, sizeof(*foo));

	/* Broadcast the data to force in-place partitioning */
	for (i = 0; i < n; i++)
		starpu_data_prefetch_on_node(handle, starpu_worker_get_memory_node(i), 0);

	struct starpu_data_filter f =
	{
		.filter_func = starpu_vector_filter_block,
		.nchildren = n,
	};

	starpu_data_partition(handle, &f);

	for (i = 0; i < f.nchildren; i++)
	{
		struct starpu_task *task = starpu_task_create();

		task->handles[0] = starpu_data_get_sub_data(handle, 1, i);
		task->cl = &scal_codelet;
		task->execute_on_a_specific_worker = 1;
		task->workerid = i;

		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_unpartition(handle, STARPU_MAIN_RAM);
	starpu_data_unregister(handle);
	starpu_shutdown();

	ret = EXIT_SUCCESS;
	for (i = 0; i < size; i++)
	{
		if (foo[i] != i*2)
		{
			FPRINTF(stderr,"value %u is %u instead of %u\n", i, foo[i], 2*i);
			ret = EXIT_FAILURE;
		}
	}
	free(foo);

        return ret;

enodev:
	starpu_data_unregister(handle);
	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;
}