1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
|
/*
* Copyright (C) by Argonne National Laboratory
* See COPYRIGHT in top-level directory
*/
#include "mpi.h"
#include "mpitest.h"
#include <stdio.h>
#include <stdlib.h>
/*
* This tests spawn_mult by using the same executable and no command-line
* options. The attribute MPI_APPNUM is used to determine which
* executable is running.
*/
int main(int argc, char *argv[])
{
MPI_Comm parentcomm, intercomm;
int i, size, rsize, rank;
int err, errs = 0;
MPI_Status status;
int flag;
static int np[2] = { 1, 1 };
int *appnum_ptr;
int can_spawn;
MTest_Init(&argc, &argv);
MTestSpawnPossible(&can_spawn);
if (can_spawn) {
MPI_Comm_get_parent(&parentcomm);
if (parentcomm == MPI_COMM_NULL) {
/* Create 2 more processes */
static char *cmds[2] = { (char *) "./spawnmult2", (char *) "./spawnmult2" };
static MPI_Info infos[2] = { MPI_INFO_NULL, MPI_INFO_NULL };
int errcodes[2];
MPI_Comm_spawn_multiple(2, cmds, MPI_ARGVS_NULL, np, infos, 0,
MPI_COMM_WORLD, &intercomm, errcodes);
} else {
intercomm = parentcomm;
}
/* We now have a valid intercomm */
MPI_Comm_remote_size(intercomm, &rsize);
MPI_Comm_size(intercomm, &size);
MPI_Comm_rank(intercomm, &rank);
if (parentcomm == MPI_COMM_NULL) {
/* This is the parent process */
if (rsize != np[0] + np[1]) {
errs++;
printf("Did not create %d processes (got %d)\n", np[0] + np[1], rsize);
}
if (rank == 0) {
/* Tell each child process what rank we think they are */
for (i = 0; i < rsize; i++) {
MPI_Send(&i, 1, MPI_INT, i, 0, intercomm);
}
/* We could use intercomm reduce to get the errors from the
* children, but we'll use a simpler loop to make sure that
* we get valid data */
for (i = 0; i < rsize; i++) {
MPI_Recv(&err, 1, MPI_INT, i, 1, intercomm, MPI_STATUS_IGNORE);
errs += err;
}
}
} else {
/* Child process */
/* FIXME: This assumes that stdout is handled for the children
* (the error count will still be reported to the parent) */
if (size != 2) {
int wsize;
errs++;
printf("(Child) Did not create 2 processes (got %d)\n", size);
MPI_Comm_size(MPI_COMM_WORLD, &wsize);
if (wsize == 2) {
errs++;
printf("(Child) world size is 2 but local intercomm size is not 2\n");
}
}
MPI_Recv(&i, 1, MPI_INT, 0, 0, intercomm, &status);
if (i != rank) {
errs++;
printf("Unexpected rank on child %d (%d)\n", rank, i);
}
/* Check for correct APPNUM */
MPI_Comm_get_attr(MPI_COMM_WORLD, MPI_APPNUM, &appnum_ptr, &flag);
/* My appnum should be my rank in comm world */
if (flag) {
if (*appnum_ptr != rank) {
errs++;
printf("appnum is %d but should be %d\n", *appnum_ptr, rank);
}
} else {
errs++;
printf("appnum was not set\n");
}
/* Send the errs back to the parent process */
MPI_Ssend(&errs, 1, MPI_INT, 0, 1, intercomm);
}
/* It isn't necessary to free the intercomm, but it should not hurt */
MPI_Comm_free(&intercomm);
/* Note that the MTest_Finalize get errs only over COMM_WORLD */
if (parentcomm == MPI_COMM_NULL) {
MTest_Finalize(errs);
} else {
MPI_Finalize();
}
} else {
MTest_Finalize(errs);
}
return MTestReturnValue(errs);
}
|
