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
|
/* -*- Mode: C; c-basic-offset:4 ; -*- */
#include "mpi.h"
#include "mpio.h" /* not necessary with MPICH 1.1.1 or HPMPI 1.4 */
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#define COUNT 1024
/* tests shared file pointer functions */
int main(int argc, char **argv)
{
int *buf, i, rank, nprocs, len, sum, global_sum;
char *filename;
MPI_File fh;
MPI_Status status;
MPI_Init(&argc,&argv);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
/* process 0 takes the file name as a command-line argument and
broadcasts it to other processes */
if (!rank) {
i = 1;
while ((i < argc) && strcmp("-fname", *argv)) {
i++;
argv++;
}
if (i >= argc) {
fprintf(stderr, "\n*# Usage: simple -fname filename\n\n");
MPI_Abort(MPI_COMM_WORLD, 1);
}
argv++;
len = strlen(*argv);
filename = (char *) malloc(len+10);
strcpy(filename, *argv);
MPI_Bcast(&len, 1, MPI_INT, 0, MPI_COMM_WORLD);
MPI_Bcast(filename, len+10, MPI_CHAR, 0, MPI_COMM_WORLD);
}
else {
MPI_Bcast(&len, 1, MPI_INT, 0, MPI_COMM_WORLD);
filename = (char *) malloc(len+10);
MPI_Bcast(filename, len+10, MPI_CHAR, 0, MPI_COMM_WORLD);
}
buf = (int *) malloc(COUNT * sizeof(int));
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
MPI_Comm_size(MPI_COMM_WORLD, &nprocs);
for (i=0; i<COUNT; i++) buf[i] = COUNT*rank + i;
MPI_File_open(MPI_COMM_WORLD, filename, MPI_MODE_CREATE | MPI_MODE_RDWR,
MPI_INFO_NULL, &fh);
MPI_File_write_shared(fh, buf, COUNT, MPI_INT, &status);
for (i=0; i<COUNT; i++) buf[i] = 0;
MPI_Barrier(MPI_COMM_WORLD);
MPI_File_seek_shared(fh, 0, MPI_SEEK_SET);
MPI_File_read_shared(fh, buf, COUNT, MPI_INT, &status);
MPI_File_close(&fh);
sum = 0;
for (i=0; i<COUNT; i++) sum += buf[i];
MPI_Allreduce(&sum, &global_sum, 1, MPI_INT, MPI_SUM, MPI_COMM_WORLD);
if (global_sum != (((COUNT*nprocs - 1)*(COUNT*nprocs))/2))
fprintf(stderr, "Error: sum %d, global_sum %d, %d\n", sum, global_sum,(((COUNT*nprocs - 1)*(COUNT*nprocs))/2));
free(buf);
free(filename);
if (!rank) fprintf(stderr, "Done\n");
MPI_Finalize();
return 0;
}
|
