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#include "orte_config.h"
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <mpi.h>
int main(int argc, char* argv[])
{
int msg, rc, i;
MPI_Comm parent, child;
int rank, size;
char hostname[OPAL_MAXHOSTNAMELEN];
pid_t pid;
MPI_Info info;
char *keyval, *tmp;
pid = getpid();
MPI_Init(NULL, NULL);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
MPI_Comm_size(MPI_COMM_WORLD, &size);
MPI_Comm_get_parent(&parent);
/* If we get COMM_NULL back, then we're the parent */
if (MPI_COMM_NULL == parent) {
if (argc < 2) {
fprintf(stderr, "Usage: info_spawn key:value key:value...\n");
exit(1);
}
pid = getpid();
printf("Parent [pid %ld] about to spawn!\n", (long)pid);
MPI_Info_create(&info);
for (i=1; i < argc; i++) {
tmp = strdup(argv[i]);
keyval = strchr(tmp, ':');
if (NULL == keyval) {
fprintf(stderr, "Missing colon separator in key-value\n");
exit(1);
}
*keyval = '\0';
keyval++;
fprintf(stderr, "SETTING %s TO %s\n", tmp, keyval);
MPI_Info_set(info, tmp, keyval);
free(tmp);
}
if (MPI_SUCCESS != (rc = MPI_Comm_spawn(argv[0], MPI_ARGV_NULL, 3, info,
0, MPI_COMM_WORLD, &child, MPI_ERRCODES_IGNORE))) {
printf("Child failed to spawn\n");
return rc;
}
printf("Parent done with spawn\n");
if (0 == rank) {
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, sizeof(hostname));
pid = getpid();
printf("Hello from the child %d of %d on host %s pid %ld\n", rank, 3, hostname, (long)pid);
if (0 == rank) {
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();
fprintf(stderr, "%d: exiting\n", pid);
return 0;
}
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