65 строки
1.4 KiB
C
65 строки
1.4 KiB
C
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/*
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* Copyright (c) 2004-2007 High Performance Computing Center Stuttgart,
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* University of Stuttgart. All rights reserved.
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* $COPYRIGHT$
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*
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* Additional copyrights may follow
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*
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* $HEADER$
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*/
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#include <stdio.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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int send_value[10],recv_value[10];
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int i;
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MPI_Status status;
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MPI_Request send_request;
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MPI_Request recv_request;
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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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for(i=0;i<10;i++)
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{
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send_value[i] = i;
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printf("\n%d:%d",i,send_value[i]);
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}
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/*
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* The last value of receive buffer is
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* uninitialized.
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*/
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if (size != 2) {
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fprintf (stderr, "Error: Need 2 processes\n");
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MPI_Finalize ();
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}
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/*
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* Now we only send 9 ints, but expect to receive 10.
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* Perfectly valid, but the receiver (in strict mode?) should not
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* depend on the data.
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*/
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MPI_Isend (&send_value, 9, MPI_INT,
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(rank + 1) % size, 4711, MPI_COMM_WORLD, &send_request);
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MPI_Irecv (&recv_value, 10, MPI_INT,
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(rank + size - 1) % size, 4711, MPI_COMM_WORLD, &recv_request);
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MPI_Wait (&send_request, &status);
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MPI_Wait (&recv_request, &status);
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/*
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* This should return an error in any mode.
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*/
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printf("\nError: buf[9]:%d",recv_value[9]);
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MPI_Finalize ();
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return 0;
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}
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