54 строки
1.6 KiB
C
54 строки
1.6 KiB
C
#include <stdio.h>
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#include <sys/types.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 msg, rc;
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MPI_Comm parent, child;
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int rank, size;
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char hostname[512];
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pid_t pid;
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MPI_Init(NULL, NULL);
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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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MPI_Comm_get_parent(&parent);
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/* If we get COMM_NULL back, then we're the parent */
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if (MPI_COMM_NULL == parent) {
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pid = getpid();
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printf("Parent [pid %ld] about to spawn!\n", (long)pid);
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if (MPI_SUCCESS != (rc = MPI_Comm_spawn(argv[0], MPI_ARGV_NULL, size, MPI_INFO_NULL,
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0, MPI_COMM_WORLD, &child, MPI_ERRCODES_IGNORE))) {
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printf("Child failed to spawn\n");
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return rc;
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}
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printf("Parent done with spawn\n");
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if (0 == rank) {
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msg = 38;
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printf("Parent sending message to child\n");
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MPI_Send(&msg, 1, MPI_INT, 0, 1, child);
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}
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MPI_Comm_disconnect(&child);
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printf("Parent disconnected\n");
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}
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/* Otherwise, we're the child */
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else {
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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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gethostname(hostname, 512);
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pid = getpid();
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printf("Hello from the child %d of %d on host %s pid %ld\n", rank, size, hostname, (long)pid);
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if (0 == rank) {
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MPI_Recv(&msg, 1, MPI_INT, 0, 1, parent, MPI_STATUS_IGNORE);
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printf("Child %d received msg: %d\n", rank, msg);
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}
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MPI_Comm_disconnect(&parent);
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printf("Child %d disconnected\n", rank);
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}
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MPI_Finalize();
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return 0;
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}
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