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/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
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/*
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* (C) 2001 by Argonne National Laboratory.
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* See COPYRIGHT in top-level directory.
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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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char str[10];
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int err = 0, errcodes[256], rank, rank1, nprocs;
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MPI_Comm intercomm1, intercomm2, intracomm;
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MPI_Init(&argc, &argv);
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MPI_Comm_size(MPI_COMM_WORLD, &nprocs);
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MPI_Comm_rank(MPI_COMM_WORLD, &rank1);
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if (nprocs != 2) {
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printf("Run this program with 2 processes\n");
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MPI_Abort(MPI_COMM_WORLD, 1);
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}
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if (rank1 == 0) {
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printf("Parents spawning 2 children...\n");
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fflush(stdout);
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}
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err = MPI_Comm_spawn("spawn_merge_child1", MPI_ARGV_NULL, 2,
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MPI_INFO_NULL, 1, MPI_COMM_WORLD, &intercomm1, errcodes);
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if (err)
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printf("Error in MPI_Comm_spawn\n");
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if (rank1 == 0) {
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printf("Parents and children merging to form new intracommunicator...\n");
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fflush(stdout);
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}
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MPI_Intercomm_merge(intercomm1, 0, &intracomm);
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if (rank1 == 0) {
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printf("Merged parents spawning 2 more children and communicating with them...\n");
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fflush(stdout);
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}
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err = MPI_Comm_spawn("spawn_merge_child2", MPI_ARGV_NULL, 2,
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MPI_INFO_NULL, 2, intracomm, &intercomm2, errcodes);
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if (err)
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printf("Error in MPI_Comm_spawn\n");
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MPI_Comm_rank(intercomm2, &rank;;
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if (rank == 2) {
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err = MPI_Recv(str, 3, MPI_CHAR, 1, 0, intercomm2, MPI_STATUS_IGNORE);
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printf("Parent received from child: %s\n", str);
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fflush(stdout);
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err = MPI_Send("bye", 4, MPI_CHAR, 1, 0, intercomm2);
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}
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MPI_Finalize();
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return 0;
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}
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