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
|
/*
* Copyright (C) by Argonne National Laboratory
* See COPYRIGHT in top-level directory
*/
#include "mpi.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "mpitest.h"
/*
static char MTEST_Descrip[] = "Test asynchronous I/O w/ multiple completion";
*/
#define SIZE (65536)
#define NUMOPS 10
/* Uses asynchronous I/O. Each process writes to separate files and
reads them back. The file name is taken as a command-line argument,
and the process rank is appended to it.*/
int main(int argc, char **argv)
{
int *buf, i, rank, nints, len;
char *filename, *tmp;
int errs = 0;
MPI_File fh;
MPI_Status statuses[NUMOPS];
MPI_Request requests[NUMOPS];
MTest_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) {
/* Use a default filename of testfile */
len = 8;
filename = (char *) malloc(len + 10);
memset(filename, 0, (len + 10) * sizeof(char));
strcpy(filename, "testfile");
/*
* fprintf(stderr, "\n*# Usage: async_any -fname filename\n\n");
* MPI_Abort(MPI_COMM_WORLD, 1);
*/
} else {
argv++;
len = (int) strlen(*argv);
filename = (char *) malloc(len + 10);
MTEST_VG_MEM_INIT(filename, (len + 10) * sizeof(char));
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);
MTEST_VG_MEM_INIT(filename, (len + 10) * sizeof(char));
MPI_Bcast(filename, len + 10, MPI_CHAR, 0, MPI_COMM_WORLD);
}
buf = (int *) malloc(SIZE);
nints = SIZE / sizeof(int);
for (i = 0; i < nints; i++)
buf[i] = rank * 100000 + i;
/* each process opens a separate file called filename.'myrank' */
tmp = (char *) malloc(len + 10);
strcpy(tmp, filename);
sprintf(filename, "%s.%d", tmp, rank);
MPI_File_open(MPI_COMM_SELF, filename, MPI_MODE_CREATE | MPI_MODE_RDWR, MPI_INFO_NULL, &fh);
MPI_File_set_view(fh, 0, MPI_INT, MPI_INT, (char *) "native", MPI_INFO_NULL);
for (i = 0; i < NUMOPS; i++) {
MPI_File_iwrite(fh, buf, nints, MPI_INT, &(requests[i]));
}
MPI_Waitall(NUMOPS, requests, statuses);
MPI_File_close(&fh);
/* reopen the file and read the data back */
for (i = 0; i < nints; i++)
buf[i] = 0;
MPI_File_open(MPI_COMM_SELF, filename, MPI_MODE_CREATE | MPI_MODE_RDWR, MPI_INFO_NULL, &fh);
MPI_File_set_view(fh, 0, MPI_INT, MPI_INT, (char *) "native", MPI_INFO_NULL);
for (i = 0; i < NUMOPS; i++) {
MPI_File_iread(fh, buf, nints, MPI_INT, &(requests[i]));
}
MPI_Waitall(NUMOPS, requests, statuses);
MPI_File_close(&fh);
/* check if the data read is correct */
for (i = 0; i < nints; i++) {
if (buf[i] != (rank * 100000 + i)) {
errs++;
fprintf(stderr, "Process %d: error, read %d, should be %d\n", rank, buf[i],
rank * 100000 + i);
}
}
free(buf);
free(filename);
free(tmp);
MTest_Finalize(errs);
return MTestReturnValue(errs);
}
|
