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
|
/*
* Copyright (C) by Argonne National Laboratory
* See COPYRIGHT in top-level directory
*/
#include "mpi.h"
#include "mpitestconf.h"
#ifdef HAVE_IOSTREAM
// Not all C++ compilers have iostream instead of iostream.h
#include <iostream>
#ifdef HAVE_NAMESPACE_STD
// Those that do need the std namespace; otherwise, a bare "cout"
// is likely to fail to compile
using namespace std;
#endif
#else
#include <iostream.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include "mpitestcxx.h"
int main(int argc, char **argv)
{
MPI::Intracomm comm;
MPI::File fh;
int r, s, i;
int fileintsize;
int errs = 0;
char filename[1024];
MPI::Offset offset;
MTest_Init();
strcpy(filename, "iotest.txt");
comm = MPI::COMM_WORLD;
s = comm.Get_size();
r = comm.Get_rank();
// Try writing the file, then check it
fh = MPI::File::Open(comm, filename, MPI::MODE_RDWR | MPI::MODE_CREATE, MPI::INFO_NULL);
// Get the size of an INT in the file
fileintsize = fh.Get_type_extent(MPI::INT);
// We let each process write in turn, getting the position after each
// write
for (i = 0; i < s; i++) {
if (i == r) {
fh.Write_shared(&i, 1, MPI::INT);
}
comm.Barrier();
offset = fh.Get_position_shared();
if (offset != fileintsize * (i + 1)) {
errs++;
cout << r << " Shared position is " << offset <<
" should be " << fileintsize * (i + 1) << "\n";
}
comm.Barrier();
}
fh.Close();
comm.Barrier();
if (r == 0) {
MPI::File::Delete(filename, MPI::INFO_NULL);
}
MTest_Finalize(errs);
}
|
