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/*
* 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.
*/
/* ADIOS C Example: read global arrays from a BP file
*
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "mpi.h"
#include "adios_read.h"
#ifdef WITH_NCSU_TIMER
#include <timer.h>
#endif
int main (int argc, char ** argv)
{
int i, datasize, ndim;
MPI_Comm comm = MPI_COMM_WORLD;
enum ADIOS_READ_METHOD method = ADIOS_READ_METHOD_BP;
ADIOS_SELECTION * sel1;
double * data = NULL;
uint64_t npoints, * points;
MPI_Init (&argc, &argv);
#ifdef WITH_NCSU_TIMER
timer_init();
#endif
adios_read_init_method (method, comm, NULL);
ADIOS_FILE * f = adios_read_open_file ("adios_global.bp", method, comm);
ADIOS_VARINFO * varinfo = adios_inq_var (f, "temperature");
if (varinfo)
{
int nranks;
ndim = varinfo->ndim;
assert(ndim == 2);
nranks = varinfo->dims[0];
assert(varinfo->dims[1] == 10);
datasize = (nranks / 2) * varinfo->dims[1] * sizeof(double);
data = malloc (datasize);
npoints = 2 * nranks;
points = malloc(npoints * ndim * sizeof(uint64_t));
for (i = 0; i < npoints; i += 2) {
points[i * ndim + 0] = i/2; // rank/row
points[i * ndim + 1] = 2; // col
points[(i+1) * ndim + 0] = i/2; // rank/row
points[(i+1) * ndim + 1] = 6; // col
}
sel1 = adios_selection_points(ndim, npoints, points);
adios_schedule_read (f, sel1, "temperature", 0, 1, data);
adios_perform_reads (f, 1);
printf("Points read (columns 2 and 6 in all rows):\n");
for (i = 0; i < npoints; i++) {
printf("(%" PRIu64 ",%" PRIu64 ") = %.0lf\n", points[i*ndim+0], points[i*ndim+1], data[i]);
}
adios_selection_delete (sel1);
}
adios_free_varinfo (varinfo);
adios_read_close (f);
adios_read_finalize_method (ADIOS_READ_METHOD_BP);
#ifdef WITH_NCSU_TIMER
timer_finalize();
#endif
MPI_Finalize ();
return 0;
}
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