inactivereq.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) 2005 by Argonne National Laboratory.
 *      See COPYRIGHT in top-level directory.
 */
#include "mpi.h"
#include <stdio.h>
#include <stdlib.h>
#include "mpitest.h"

/* This test program checks that the point-to-point completion routines
   can be applied to an inactive persistent request, as required by the 
   MPI-1 standard. See section 3.7.3, for example, 

   One is allowed to call MPI TEST with a null or inactive request argument. 
   In such a case the operation returns with flag = true and empty status.

*/

int StatusEmpty( MPI_Status *s )
{
    int errs = 0;
    int count = 10;

    if (s->MPI_TAG != MPI_ANY_TAG) {
	errs++;
	printf( "MPI_TAG not MPI_ANY_TAG in status\n" );
    }
    if (s->MPI_SOURCE != MPI_ANY_SOURCE) {
	errs++;
	printf( "MPI_SOURCE not MPI_ANY_SOURCE in status\n" );
    }
    MPI_Get_count( s, MPI_INT, &count );
    if (count != 0) {
	errs++;
	printf( "count in status is not 0\n" );
    }
    /* Return true only if status passed all tests */
    return errs ? 0 : 1;
}

int main(int argc, char *argv[])
{
    MPI_Request r;
    MPI_Status  s;
    int errs = 0;
    int flag;
    int buf[10];
    int tag = 27;
    int dest = 0;

    MTest_Init( &argc, &argv );

    /* Create a persistent send request */
    MPI_Send_init( buf, 10, MPI_INT, dest, tag, MPI_COMM_WORLD, &r );

    flag = 0;
    s.MPI_TAG = 10;
    s.MPI_SOURCE = 10;
    MPI_Test( &r, &flag, &s );
    if (!flag) {
	errs++;
	printf( "Flag not true after MPI_Test\n" );
	printf( "Aborting further tests to avoid hanging in MPI_Wait\n" );
	MTest_Finalize( errs );
	MPI_Finalize();
	return 0;
    }
    if (!StatusEmpty( &s )) {
	errs++;
	printf( "Status not empty after MPI_Test\n" );
    }

    s.MPI_TAG = 10;
    s.MPI_SOURCE = 10;
    MPI_Wait( &r, &s );
    if (!StatusEmpty( &s )) {
	errs++;
	printf( "Status not empty after MPI_Wait\n" );
    }

    MPI_Request_free( &r );

    /* Create a persistent receive request */
    MPI_Recv_init( buf, 10, MPI_INT, dest, tag, MPI_COMM_WORLD, &r );

    flag = 0;
    s.MPI_TAG = 10;
    s.MPI_SOURCE = 10;
    MPI_Test( &r, &flag, &s );
    if (!flag) {
	errs++;
	printf( "Flag not true after MPI_Test\n" );
	printf( "Aborting further tests to avoid hanging in MPI_Wait\n" );
	MTest_Finalize( errs );
	MPI_Finalize();
	return 0;
    }
    if (!StatusEmpty( &s )) {
	errs++;
	printf( "Status not empty after MPI_Test\n" );
    }

    s.MPI_TAG = 10;
    s.MPI_SOURCE = 10;
    MPI_Wait( &r, &s );
    if (!StatusEmpty( &s )) {
	errs++;
	printf( "Status not empty after MPI_Wait\n" );
    }

    MPI_Request_free( &r );
    
    MTest_Finalize( errs );
    MPI_Finalize();
    return 0;
}