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/* StarPU --- Runtime system for heterogeneous multicore architectures.
*
* Copyright (C) 2009-2022 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.
*/
/* This example shows how to submit a series of tasks in a chain of dependency:
*
* ... -> task (i) --> task (i+1) --> ...
*
* but here submitted in reverse order.
*
* This is repeated several times
*/
#include <string.h>
#include <math.h>
#include <sys/types.h>
#include <signal.h>
#include <starpu.h>
#define FPRINTF(ofile, fmt, ...) do { if (!getenv("STARPU_SSILENT")) {fprintf(ofile, fmt, ## __VA_ARGS__); }} while(0)
#define TAG(i, iter) ((starpu_tag_t) (((uint64_t)iter)<<32 | (i)))
#define Ni 64
#define Nk 256
static unsigned ni = Ni, nk = Nk;
static void parse_args(int argc, char **argv)
{
int i;
for (i = 1; i < argc; i++)
{
if (strcmp(argv[i], "-iter") == 0)
{
char *argptr;
nk = strtol(argv[++i], &argptr, 10);
}
if (strcmp(argv[i], "-i") == 0)
{
char *argptr;
ni = strtol(argv[++i], &argptr, 10);
}
if (strcmp(argv[i], "-h") == 0)
{
printf("usage : %s [-iter iter] [-i i]\n", argv[0]);
}
}
}
void callback_cpu(void *argcb);
static void tag_cleanup_grid(unsigned iter)
{
unsigned i;
for (i = 0; i < ni; i++)
starpu_tag_remove(TAG(i,iter));
}
static int create_task_grid(unsigned iter)
{
int i;
/* FPRINTF(stderr, "start iter %d ni %d...\n", iter, ni); */
for (i = ni - 1; i > 0; i--)
{
int ret;
/* create a new task */
struct starpu_task *task = starpu_task_create();
task->cl = &starpu_codelet_nop;
task->cl_arg = NULL;
task->use_tag = 1;
task->tag_id = TAG(i, iter);
if (i != 1)
starpu_tag_declare_deps(TAG(i,iter), 1, TAG(i-1,iter));
ret = starpu_task_submit(task);
if (ret == -ENODEV) return 77;
STARPU_CHECK_RETURN_VALUE(ret, "starpu_task_submit");
}
return 0;
}
void cpu_codelet(void *descr[], void *_args)
{
(void)descr;
(void)_args;
}
int main(int argc, char **argv)
{
unsigned i;
int ret;
ret = starpu_init(NULL);
if (ret == -ENODEV)
exit(77);
STARPU_CHECK_RETURN_VALUE(ret, "starpu_init");
#ifdef STARPU_QUICK_CHECK
ni /= 4;
nk /= 16;
#endif
parse_args(argc, argv);
FPRINTF(stderr, "ITER : %u\n", nk);
for (i = 0; i < nk; i++)
{
ret = create_task_grid(i);
if (ret == 77) goto enodev;
starpu_tag_wait(TAG(ni-1, i));
/* cleanup old grids ... */
if (i > 1)
tag_cleanup_grid(i-1);
}
enodev:
starpu_shutdown();
FPRINTF(stderr, "TEST DONE ...\n");
return ret;
}
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