68 строки
1.8 KiB
C
68 строки
1.8 KiB
C
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/*
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* Copyright (c) 2007 Sun Microsystems, Inc. All rights reserved.
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*/
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/*
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* Test the connectivity between all processes.
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*/
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <netdb.h>
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#include <unistd.h>
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#include <mpi.h>
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int
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main(int argc, char **argv)
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{
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MPI_Status status;
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int verbose = 0;
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int rank;
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int np; /* number of processes in job */
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int peer;
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int i;
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int j;
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int length;
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char name[MPI_MAX_PROCESSOR_NAME+1];
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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, &np);
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/*
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* If we cannot get the name for whatever reason, just
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* set it to unknown. */
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if (MPI_SUCCESS != MPI_Get_processor_name(name, &length)) {
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strcpy(name, "unknown");
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}
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if (argc>1 && strcmp(argv[1], "-v")==0)
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verbose = 1;
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for (i=0; i<np; i++) {
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if (rank==i) {
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/* rank i sends to and receives from each higher rank */
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for(j=i+1; j<np; j++) {
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if (verbose)
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printf("checking connection between rank %d on %s and rank %-4d\n",
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i, name, j);
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MPI_Send(&rank, 1, MPI_INT, j, rank, MPI_COMM_WORLD);
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MPI_Recv(&peer, 1, MPI_INT, j, j, MPI_COMM_WORLD, &status);
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}
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} else if (rank>i) {
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/* receive from and reply to rank i */
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MPI_Recv(&peer, 1, MPI_INT, i, i, MPI_COMM_WORLD, &status);
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MPI_Send(&rank, 1, MPI_INT, i, rank, MPI_COMM_WORLD);
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}
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}
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MPI_Barrier(MPI_COMM_WORLD);
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if (rank==0)
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printf("Connectivity test on %d processes PASSED.\n", np);
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MPI_Finalize();
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return 0;
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}
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