46 строки
881 B
C
46 строки
881 B
C
/* -*- C -*-
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*
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* $HEADER$
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*
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* The most basic of MPI applications
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "mpi.h"
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int main(int argc, char* argv[])
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{
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int rank, size;
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char *rk;
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/* get the MPI rank from the environ */
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if (NULL == (rk = getenv("OMPI_COMM_WORLD_RANK"))) {
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fprintf(stderr, "FAILED TO GET RANK\n");
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exit(1);
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}
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if (1 < argc) {
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/* rank 0 exits first */
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if (0 == strcmp(rk, "0")) {
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exit(1);
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} else {
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sleep(1);
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}
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} else {
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if (0 == strcmp(rk, "0")) {
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sleep(1);
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exit(1);
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}
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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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printf("Hello, World, I am %d of %d\n", rank, size);
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MPI_Finalize();
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return 0;
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}
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