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
|
/*
* Copyright (C) by Argonne National Laboratory
* See COPYRIGHT in top-level directory
*/
#include "mpi.h"
#include "mpitest.h"
#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
/*
static char MTEST_Descrip[] = "A simple test of Comm_spawn";
*/
int main(int argc, char *argv[])
{
int errs = 0, err;
int rank, size, rsize, i;
int np = 2;
int errcodes[2];
MPI_Comm parentcomm, intercomm;
MPI_Status status;
int can_spawn;
MTest_Init(&argc, &argv);
errs += MTestSpawnPossible(&can_spawn);
if (can_spawn) {
MPI_Comm_get_parent(&parentcomm);
if (parentcomm == MPI_COMM_NULL) {
/* Create 2 more processes */
MPI_Comm_spawn((char *) "./spawn1", MPI_ARGV_NULL, np,
MPI_INFO_NULL, 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) {
/* Parent */
if (rsize != np) {
errs++;
printf("Did not create %d processes (got %d)\n", np, rsize);
}
if (rank == 0) {
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 */
char cname[MPI_MAX_OBJECT_NAME];
int rlen;
if (size != np) {
errs++;
printf("(Child) Did not create %d processes (got %d)\n", np, size);
}
/* Check the name of the parent */
cname[0] = 0;
MPI_Comm_get_name(intercomm, cname, &rlen);
/* MPI-2 section 8.4 requires that the parent have this
* default name */
if (strcmp(cname, "MPI_COMM_PARENT") != 0) {
errs++;
printf("Name of parent is not correct\n");
if (rlen > 0 && cname[0]) {
printf(" Got %s but expected MPI_COMM_PARENT\n", cname);
} else {
printf(" Expected MPI_COMM_PARENT but no name set\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);
}
/* 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 */
/* Using Comm_disconnect instead of free should provide a stronger
* test, as a high-quality MPI implementation will be able to
* recover some resources that it should hold on to in the case
* of MPI_Comm_free */
/* MPI_Comm_free(&intercomm); */
MPI_Comm_disconnect(&intercomm);
/* Note that the MTest_Finalize get errs only over COMM_WORLD */
/* Note also that both the parent and child will generate "No Errors"
* if both call MTest_Finalize */
if (parentcomm == MPI_COMM_NULL) {
MTest_Finalize(errs);
} else {
MPI_Finalize();
}
} else {
MTest_Finalize(errs);
}
return MTestReturnValue(errs);
}
|
