This source file includes following definitions.
- main
1 #include "orte_config.h"
2
3 #include <stdio.h>
4 #include <sys/types.h>
5 #include <unistd.h>
6 #include <string.h>
7 #include <stdlib.h>
8
9 #include <mpi.h>
10
11 int main(int argc, char* argv[])
12 {
13 int msg, rc, i;
14 MPI_Comm parent, child;
15 int rank, size;
16 char hostname[OPAL_MAXHOSTNAMELEN];
17 pid_t pid;
18 MPI_Info info;
19 char *keyval, *tmp;
20
21 pid = getpid();
22 MPI_Init(NULL, NULL);
23 MPI_Comm_rank(MPI_COMM_WORLD, &rank);
24 MPI_Comm_size(MPI_COMM_WORLD, &size);
25
26 MPI_Comm_get_parent(&parent);
27
28 if (MPI_COMM_NULL == parent) {
29 if (argc < 2) {
30 fprintf(stderr, "Usage: info_spawn key:value key:value...\n");
31 exit(1);
32 }
33
34 pid = getpid();
35 printf("Parent [pid %ld] about to spawn!\n", (long)pid);
36 MPI_Info_create(&info);
37 for (i=1; i < argc; i++) {
38 tmp = strdup(argv[i]);
39 keyval = strchr(tmp, ':');
40 if (NULL == keyval) {
41 fprintf(stderr, "Missing colon separator in key-value\n");
42 exit(1);
43 }
44 *keyval = '\0';
45 keyval++;
46 fprintf(stderr, "SETTING %s TO %s\n", tmp, keyval);
47 MPI_Info_set(info, tmp, keyval);
48 free(tmp);
49 }
50 if (MPI_SUCCESS != (rc = MPI_Comm_spawn(argv[0], MPI_ARGV_NULL, 3, info,
51 0, MPI_COMM_WORLD, &child, MPI_ERRCODES_IGNORE))) {
52 printf("Child failed to spawn\n");
53 return rc;
54 }
55 printf("Parent done with spawn\n");
56 if (0 == rank) {
57 msg = 38;
58 printf("Parent sending message to child\n");
59 MPI_Send(&msg, 1, MPI_INT, 0, 1, child);
60 }
61 MPI_Comm_disconnect(&child);
62 printf("Parent disconnected\n");
63 }
64
65 else {
66 MPI_Comm_rank(MPI_COMM_WORLD, &rank);
67 MPI_Comm_size(MPI_COMM_WORLD, &size);
68 gethostname(hostname, sizeof(hostname));
69 pid = getpid();
70 printf("Hello from the child %d of %d on host %s pid %ld\n", rank, 3, hostname, (long)pid);
71 if (0 == rank) {
72 MPI_Recv(&msg, 1, MPI_INT, 0, 1, parent, MPI_STATUS_IGNORE);
73 printf("Child %d received msg: %d\n", rank, msg);
74 }
75 MPI_Comm_disconnect(&parent);
76 printf("Child %d disconnected\n", rank);
77 }
78
79 MPI_Finalize();
80 fprintf(stderr, "%d: exiting\n", pid);
81 return 0;
82 }