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
|
/*
* This code was written by Intel Corporation. Copyright (C) 2011-2012 Intel Corporation.
* Intel provides this material to Argonne National Laboratory subject to
* Software Grant and Corporate Contributor License Agreement dated February 8, 2012.
*
* See COPYRIGHT in top-level directory.
*/
#include <stdlib.h>
#include <stdio.h>
#include "mpi.h"
#define TEST_LE 0x1
#define TEST_BE 0x2
#define TEST_FILENAME "test.datarep"
#define CHECK(fn) {int errcode; errcode = (fn); if (errcode != MPI_SUCCESS) handle_error(errcode, NULL); }
static void handle_error(int errcode, char *str)
{
char msg[MPI_MAX_ERROR_STRING];
int resultlen;
MPI_Error_string(errcode, msg, &resultlen);
fprintf(stderr, "%s: (%d) %s\n", str, errcode, msg);
MPI_Abort(MPI_COMM_WORLD, 1);
}
static void is_little_or_big_endian( const char* datarep, char* c, char* c_le, int len ) {
int i, is_le = 1, is_be = 1;
for( i = 0; i < len; i++ ) {
is_le = is_le && ( c[i] == c_le[i] );
is_be = is_be && ( c[i] == c_le[len-1-i] );
}
printf( "%s datarep is ", datarep );
switch ((is_le ? TEST_LE : 0x0) | (is_be ? TEST_BE : 0x0) ) {
case TEST_LE: printf( "LITTLE ENDIAN\n" ); break;
case TEST_BE: printf( "BIG ENDIAN\n" ); break;
case TEST_LE | TEST_BE: printf( "LITTLE or BIG ENDIAN\n" ); break;
default: printf( "unknown\n" ); break;
}
}
/* This test checks if datareps given are little- or big-endian */
int main( int argc, char* argv[] ) {
int sample_i = 123456789, i, j;
char sample_i_le[4] = {0x15,0xcd,0x5b,0x07}, c[4];
const char* datarep[3] = { "native", "external32", "internal" };
MPI_File fileh;
int rank;
FILE* fileh_std;
if( sizeof(int) != 4 ) { printf( "non-supported sizeof(int)=%ld\n", sizeof(int) ); return (-1); }
MPI_Init( &argc, &argv );
MPI_Comm_rank( MPI_COMM_WORLD, &rank );
/* For each datarep */
for( i = 0; i < 3; i++ ) {
/* Open file */
CHECK(MPI_File_open( MPI_COMM_WORLD, TEST_FILENAME,
MPI_MODE_RDWR | MPI_MODE_CREATE, MPI_INFO_NULL, &fileh ) );
/* Set view */
CHECK(MPI_File_set_view( fileh, 0, MPI_INT, MPI_INT, datarep[i], MPI_INFO_NULL ));
/* Write into file */
CHECK(MPI_File_write_at( fileh, (MPI_Offset)rank, (void*)&sample_i, 1,
MPI_INT, MPI_STATUS_IGNORE ));
/* Close file */
CHECK(MPI_File_close( &fileh ));
/* Check if your datarep is little or big endian */
MPI_Barrier( MPI_COMM_WORLD );
if( rank == 0 ) {
fileh_std = fopen( TEST_FILENAME, "r" );
for( j = 0; j < 4; j++ ) {
if( feof( fileh_std ) ) { printf( "unexpected eof, aborted\n" ); return (-1); }
fscanf( fileh_std, "%c", &c[j] );
}
is_little_or_big_endian( datarep[i], c, sample_i_le, 4 );
fclose( fileh_std );
}
/* Delete file */
if( rank == 0 ) {
CHECK(MPI_File_delete( TEST_FILENAME, MPI_INFO_NULL ));
}
}
MPI_Finalize();
return 0;
}
|
