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
|
/*
* ADIOS is freely available under the terms of the BSD license described
* in the COPYING file in the top level directory of this source distribution.
*
* Copyright (c) 2008 - 2009. UT-BATTELLE, LLC. All rights reserved.
*/
#include <stdio.h>
#include <string.h>
#include "mpi.h"
#include "adios.h"
/*************************************************************/
/* Example of writing arrays in ADIOS */
/* */
/* Similar example is manual/2_adios_write.c */
/*************************************************************/
int main (int argc, char ** argv)
{
/* application data structures */
char filename [256];
int rank, i, j;
int NX = 10, NY = 100;
double t[NX][NY];
int p[NX];
/* MPI and ADIOS data structures */
MPI_Comm comm = MPI_COMM_WORLD;
uint64_t adios_groupsize, adios_totalsize;
int64_t adios_handle;
/* MPI and ADIOS setup */
MPI_Init (&argc, &argv);
MPI_Comm_rank (comm, &rank);
strcpy (filename, "arrays");
adios_init ("arrays.xml", comm);
/* write data 200 times so that it forms a stream */
int ii=0;
for(ii=0; ii<30; ii++) {
/* must open eveery time for stream api to work */
adios_open (&adios_handle, "arrays", filename, "w", comm);
/* initialize 2d array to:
(rank*1000000) + (stream step * 1000) + offset */
for (i = 0; i < NX; i++)
for (j = 0; j< NY; j++)
t[i][j] = (rank * 1000000) + (ii * 1000) + (i*NY) + j;
/* initialize 1d array similarly */
for (i = 0; i < NX; i++)
p[i] = (rank*1000000) + (ii * 1000) + i;
/* groupsize registration (necessary?) */
adios_groupsize = 4 + 4 + 8 * (NX) * (NY) + 4 * (NX);
adios_group_size (adios_handle, adios_groupsize, &adios_totalsize);
/* write a step */
adios_write (adios_handle, "NX", &NX);
adios_write (adios_handle, "NY", &NY);
adios_write (adios_handle, "var_double_2Darray", t);
adios_write (adios_handle, "var_int_1Darray", p);
//fprintf(stderr, "2d arr %p 1d arr %p\n", t, p);
/* commit the write */
adios_close (adios_handle);
printf("Committed Rank=%d Step=%d\n\n", rank, ii);
}
/* insure all writers are done before shutdown */
MPI_Barrier (comm);
/* shutdown adios and mpi */
adios_finalize (rank);
MPI_Finalize ();
return 0;
}
|
