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/* StarPU --- Runtime system for heterogeneous multicore architectures.
*
* Copyright (C) 2009-2025 University of 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 is a small example of a C++ program using starpu. We here just
* add two std::vector without copying them (0 copy).
*/
#include <assert.h>
#include <vector>
#ifdef PRINT_OUTPUT
#include <iostream>
#endif
#include <starpu.h>
#if !defined(STARPU_HAVE_CXX11)
int main(int argc, char **argv)
{
return 77;
}
#else
void cpu_kernel_add_vectors(void *buffers[], void *cl_arg)
{
// get the current task
auto task = starpu_task_get_current();
// get the user data (pointers to the vec_A, vec_B, vec_C std::vector)
auto u_data0 = starpu_data_get_user_data(task->handles[0]); assert(u_data0);
auto u_data1 = starpu_data_get_user_data(task->handles[1]); assert(u_data1);
auto u_data2 = starpu_data_get_user_data(task->handles[2]); assert(u_data2);
// cast void* in std::vector<char>*
auto vec_A = static_cast<std::vector<char>*>(u_data0);
auto vec_B = static_cast<std::vector<char>*>(u_data1);
auto vec_C = static_cast<std::vector<char>*>(u_data2);
// all the std::vector have to have the same size
assert(vec_A->size() == vec_B->size() && vec_B->size() == vec_C->size());
// performs the vector addition (vec_C[] = vec_A[] + vec_B[])
for (size_t i = 0; i < vec_C->size(); i++)
(*vec_C)[i] = (*vec_A)[i] + (*vec_B)[i];
}
int main(int argc, char **argv)
{
constexpr int vec_size = 1024;
std::vector<char> vec_A(vec_size, 2); // all the vector is initialized to 2
std::vector<char> vec_B(vec_size, 3); // all the vector is initialized to 3
std::vector<char> vec_C(vec_size, 0); // all the vector is initialized to 0
struct starpu_conf conf;
starpu_conf_init(&conf);
/* starpu_data_get_user_data cannot work in master-slave */
conf.nmpi_ms = 0;
conf.ntcpip_ms = 0;
// initialize StarPU with default configuration
auto ret = starpu_init(&conf);
if (ret == -ENODEV)
return 77;
STARPU_CHECK_RETURN_VALUE(ret, "starpu_init");
if (starpu_memory_nodes_get_numa_count() > 1)
{
starpu_shutdown();
return 77;
}
// StarPU data registering
starpu_data_handle_t spu_vec_A;
starpu_data_handle_t spu_vec_B;
starpu_data_handle_t spu_vec_C;
// give the data of the vector to StarPU (C array)
starpu_vector_data_register(&spu_vec_A, STARPU_MAIN_RAM, (uintptr_t)vec_A.data(), vec_A.size(), sizeof(char));
starpu_vector_data_register(&spu_vec_B, STARPU_MAIN_RAM, (uintptr_t)vec_B.data(), vec_B.size(), sizeof(char));
starpu_vector_data_register(&spu_vec_C, STARPU_MAIN_RAM, (uintptr_t)vec_C.data(), vec_C.size(), sizeof(char));
// pass the pointer to the C++ vector object to StarPU
starpu_data_set_user_data(spu_vec_A, (void*)&vec_A);
starpu_data_set_user_data(spu_vec_B, (void*)&vec_B);
starpu_data_set_user_data(spu_vec_C, (void*)&vec_C);
// create the StarPU codelet
starpu_codelet cl;
starpu_codelet_init(&cl);
cl.cpu_funcs [0] = cpu_kernel_add_vectors;
cl.cpu_funcs_name[0] = "cpu_kernel_add_vectors";
cl.nbuffers = 3;
cl.modes [0] = STARPU_R;
cl.modes [1] = STARPU_R;
cl.modes [2] = STARPU_W;
cl.name = "add_vectors";
// submit a new StarPU task to execute
ret = starpu_task_insert(&cl,
STARPU_R, spu_vec_A,
STARPU_R, spu_vec_B,
STARPU_W, spu_vec_C,
0);
if (ret == -ENODEV)
{
// StarPU data unregistering
starpu_data_unregister(spu_vec_C);
starpu_data_unregister(spu_vec_B);
starpu_data_unregister(spu_vec_A);
// terminate StarPU, no task can be submitted after
starpu_shutdown();
return 77;
}
STARPU_CHECK_RETURN_VALUE(ret, "task_submit::add_vectors");
// wait the task
starpu_task_wait_for_all();
// StarPU data unregistering
starpu_data_unregister(spu_vec_C);
starpu_data_unregister(spu_vec_B);
starpu_data_unregister(spu_vec_A);
// terminate StarPU, no task can be submitted after
starpu_shutdown();
// check results
auto fail = false;
auto i = 0;
while (!fail && i < vec_size)
fail = vec_C[i++] != 5;
if (fail)
{
#ifdef PRINT_OUTPUT
std::cout << "Example failed..." << std::endl;
#endif
return EXIT_FAILURE;
}
else
{
#ifdef PRINT_OUTPUT
std::cout << "Example successfully passed!" << std::endl;
#endif
return EXIT_SUCCESS;
}
}
#endif
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