contigstruct.c

mpi并行计算的c++代码 可用vc或gcc编译通过 可以用来搭建并行计算试验环境

/* -*- Mode: C; c-basic-offset:4 ; -*- */
/*
 *
 *  (C) 2003 by Argonne National Laboratory.
 *      See COPYRIGHT in top-level directory.
 */
#include "mpi.h"
#include <stdio.h>

/*
 * This test checks to see if we can create a simple datatype
 * made from many contiguous copies of a single struct.  The
 * struct is built with monotone decreasing displacements to
 * avoid any struct->contig optimizations.
 */

int main( int argc, char **argv )
{
    int           blocklens[8], psize, i, rank;
    MPI_Aint      displs[8];
    MPI_Datatype  oldtypes[8];
    MPI_Datatype  ntype1, ntype2;

    MPI_Init( &argc, &argv );
    MPI_Comm_rank( MPI_COMM_WORLD, &rank );
    
    for (i=0; i<8; i++) {
	blocklens[i] = 1;
	displs[i]    = (7-i) * sizeof(long);
	oldtypes[i]  = MPI_LONG;
    }
    MPI_Type_struct( 8, blocklens, displs, oldtypes, &ntype1 );
    MPI_Type_contiguous( 65536, ntype1, &ntype2 );
    MPI_Type_commit( &ntype2 );

    MPI_Pack_size( 2, ntype2, MPI_COMM_WORLD, &psize );

    MPI_Type_free( &ntype2 );
	MPI_Type_free( &ntype1 );

    /* The only failure mode has been SEGV or aborts within the datatype
       routines */
    if (rank == 0) {
	printf( " No Errors\n" );
    }

    MPI_Finalize();
    return 0;
}