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+/* StarPU --- Runtime system for heterogeneous multicore architectures.
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+ *
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+ * Copyright (C) 2015 Centre National de la Recherche Scientifique
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+ *
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+ * StarPU is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU Lesser General Public License as published by
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+ * the Free Software Foundation; either version 2.1 of the License, or (at
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+ * your option) any later version.
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+ *
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+ * StarPU is distributed in the hope that it will be useful, but
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+ * WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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+ *
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+ * See the GNU Lesser General Public License in COPYING.LGPL for more details.
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+ */
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+
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+/*
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+ * This example splits the whole set of communicators in subgroups,
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+ * all communications take place within each subgroups
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+ */
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+
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+#include <starpu_mpi.h>
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+#include "../helper.h"
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+
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+void func_cpu(void *descr[], STARPU_ATTRIBUTE_UNUSED void *_args)
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+{
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+ int *value = (int *)STARPU_VARIABLE_GET_PTR(descr[0]);
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+ int rank;
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+
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+ starpu_codelet_unpack_args(_args, &rank);
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+ FPRINTF_MPI(stderr, "Executing codelet with value %d and rank %d\n", *value, rank);
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+ STARPU_ASSERT_MSG(*value == rank, "Received value %d is not the expected value %d\n", *value, rank);
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+}
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+
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+struct starpu_codelet mycodelet =
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+{
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+ .cpu_funcs = {func_cpu},
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+ .nbuffers = 1,
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+ .modes = {STARPU_RW}
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+};
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+
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+int main(int argc, char **argv)
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+{
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+ int size, n, x=789;
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+ int color;
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+ MPI_Comm newcomm;
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+ int rank, newrank;
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+ int ret;
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+ starpu_data_handle_t data[2];
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+
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+ MPI_Init(&argc, &argv);
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+ MPI_Comm_rank(MPI_COMM_WORLD, &rank);
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+ MPI_Comm_size(MPI_COMM_WORLD, &size);
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+
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+ if (size < 4)
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+ {
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+ FPRINTF(stderr, "We need at least 4 processes.\n");
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+ MPI_Finalize();
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+ return STARPU_TEST_SKIPPED;
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+ }
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+
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+ color = rank%2;
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+ MPI_Comm_split(MPI_COMM_WORLD, color, rank, &newcomm);
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+ MPI_Comm_rank(newcomm, &newrank);
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+ FPRINTF(stderr, "[%d][%d] color %d\n", rank, newrank, color);
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+
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+ if (newrank == 0)
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+ {
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+ FPRINTF(stderr, "[%d][%d] sending %d\n", rank, newrank, rank);
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+ MPI_Send(&rank, 1, MPI_INT, 1, 10, newcomm);
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+ }
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+ else if (newrank == 1)
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+ {
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+ MPI_Recv(&x, 1, MPI_INT, 0, 10, newcomm, NULL);
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+ FPRINTF(stderr, "[%d][%d] received %d\n", rank, newrank, x);
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+ }
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+
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+ ret = starpu_init(NULL);
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+ STARPU_CHECK_RETURN_VALUE(ret, "starpu_init");
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+ ret = starpu_mpi_init_comm(NULL, NULL, 0, newcomm);
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+ STARPU_CHECK_RETURN_VALUE(ret, "starpu_mpi_init");
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+
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+ if (newrank == 0)
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+ {
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+ starpu_variable_data_register(&data[0], STARPU_MAIN_RAM, (uintptr_t)&rank, sizeof(unsigned));
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+ starpu_variable_data_register(&data[1], STARPU_MAIN_RAM, (uintptr_t)&rank, sizeof(unsigned));
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+ starpu_mpi_data_register_comm(data[1], 22, 0, newcomm);
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+ }
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+ else
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+ starpu_variable_data_register(&data[0], -1, (uintptr_t)NULL, sizeof(unsigned));
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+ starpu_mpi_data_register_comm(data[0], 12, 0, newcomm);
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+
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+ if (newrank == 0)
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+ {
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+ starpu_mpi_req req[2];
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+ starpu_mpi_issend(data[1], &req[0], 1, 22, newcomm);
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+ starpu_mpi_isend(data[0], &req[1], 1, 12, newcomm);
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+ starpu_mpi_wait(&req[0], NULL);
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+ starpu_mpi_wait(&req[1], NULL);
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+ }
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+ else if (newrank == 1)
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+ {
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+ int *xx;
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+
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+ starpu_mpi_recv(data[0], 0, 12, newcomm, NULL);
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+ xx = (int *)starpu_variable_get_local_ptr(data[0]);
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+ FPRINTF(stderr, "[%d][%d] received %d\n", rank, newrank, *xx);
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+ STARPU_ASSERT_MSG(x==*xx, "Received value %d is incorrect (should be %d)\n", *xx, x);
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+
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+ starpu_variable_data_register(&data[1], -1, (uintptr_t)NULL, sizeof(unsigned));
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+ starpu_mpi_data_register_comm(data[1], 22, 0, newcomm);
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+ starpu_mpi_recv(data[0], 0, 22, newcomm, NULL);
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+ xx = (int *)starpu_variable_get_local_ptr(data[0]);
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+ FPRINTF(stderr, "[%d][%d] received %d\n", rank, newrank, *xx);
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+ STARPU_ASSERT_MSG(x==*xx, "Received value %d is incorrect (should be %d)\n", *xx, x);
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+ }
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+
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+ if (newrank == 0 || newrank == 1)
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+ {
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+ starpu_mpi_insert_task(newcomm, &mycodelet,
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+ STARPU_RW, data[0],
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+ STARPU_VALUE, &x, sizeof(x),
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+ STARPU_EXECUTE_ON_NODE, 1,
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+ 0);
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+
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+ starpu_task_wait_for_all();
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+ starpu_data_unregister(data[0]);
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+ starpu_data_unregister(data[1]);
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+ }
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+
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+ starpu_mpi_shutdown();
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+ starpu_shutdown();
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+ MPI_Finalize();
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+ return 0;
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+}
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Nathalie Furmento