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openmpi/orte/test/mpi/simple_spawn.c

45 строки
1.4 KiB
C
Исходник Обычный вид История

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