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
|
/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
/*
* (C) 2001 by Argonne National Laboratory.
* See COPYRIGHT in top-level directory.
*/
#include <stdlib.h>
#include <stdio.h>
#include <mpi.h>
int main(int argc, char **argv)
{
int size;
int rank;
int * msg = NULL;
int msg_sz = 0;
int niter = 1;
int iter;
int i;
if (MPI_Init(&argc, &argv) != MPI_SUCCESS)
{
printf("ERROR: problem with MPI_Init\n"); fflush(stdout);
}
if (MPI_Comm_size(MPI_COMM_WORLD, &size) != MPI_SUCCESS)
{
printf("ERROR: problem with MPI_Comm_size\n"); fflush(stdout);
}
if (MPI_Comm_rank(MPI_COMM_WORLD, &rank) != MPI_SUCCESS)
{
printf("ERROR: problem with MPI_Comm_rank\n"); fflush(stdout);
}
printf("sr: size %d rank %d\n", size, rank); fflush(stdout);
if (size < 2)
{
printf("ERROR: needs to be run with at least 2 procs\n");
fflush(stdout);
}
if (argc > 1)
{
sscanf(argv[1], "%d", &msg_sz);
}
if (argc > 2)
{
sscanf(argv[2], "%d", &niter);
}
if (rank == 0)
{
printf("msg_sz=%d, niter=%d\n", msg_sz, niter);
fflush(stdout);
}
if (msg_sz > 0)
{
msg = (int *) malloc(msg_sz * sizeof(int));
}
if (rank == 0)
{
/* usleep(10000); */
for (iter = 0; iter < niter; iter++)
{
for (i = 0; i < msg_sz; i++)
{
msg[i] = iter * msg_sz + i;
}
if (MPI_Send(msg, msg_sz, MPI_INT, 1, iter, MPI_COMM_WORLD)
!= MPI_SUCCESS)
{
printf("ERROR: problem with MPI_Send\n"); fflush(stdout);
}
}
}
else if (rank == 1)
{
MPI_Status status;
for (iter = 0; iter < niter; iter++)
{
if (MPI_Recv(msg, msg_sz, MPI_INT, 0, iter, MPI_COMM_WORLD,
&status) != MPI_SUCCESS)
{
printf("ERROR: problem with MPI_Recv\n"); fflush(stdout);
}
for (i = 0; i < msg_sz; i++)
{
if (msg[i] != iter * msg_sz + i)
{
printf("ERROR: %d != %d, i=%d iter=%d\n", msg[i],
iter * msg_sz + i, i, iter);
fflush(stdout);
abort();
}
}
}
printf("All messages successfully received!\n");
fflush(stdout);
}
printf("sr: process %d finished\n", rank); fflush(stdout);
if (MPI_Finalize() != MPI_SUCCESS)
{
printf("ERROR: problem with MPI_Finalize\n"); fflush(stdout);
}
return 0;
}
|
