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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
*
* This code is using the generic read API, which can read in
* arbitrary slices of an array and thus we can read in an array
* on arbitrary number of processes (provided our code is smart
* enough to do the domain decomposition).
*
* Run this example after adios_global, which generates
* adios_global.bp. Run this example on equal or less
* number of processes since we decompose only on one
* dimension of the global array here.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "mpi.h"
#include "adios_read.h"
int main (int argc, char ** argv)
{
int rank, size, i, datasize;
//int j;
MPI_Comm comm = MPI_COMM_WORLD;
enum ADIOS_READ_METHOD method = ADIOS_READ_METHOD_BP;
ADIOS_SELECTION * sel1;
//ADIOS_SELECTION * sel2;
//ADIOS_VARCHUNK * chunk = 0;
void * data = NULL;
uint64_t start[2], count[2];
//uint64_t npoints, * points;
MPI_Init (&argc, &argv);
MPI_Comm_rank (comm, &rank);
MPI_Comm_size (comm, &size);
adios_read_init_method (method, comm, "max_chunk_size=4;verbose=3;num_aggregators=2");
ADIOS_FILE * f = adios_read_open_file ("adios_global.bp", method, comm);
if (f != NULL)
{
ADIOS_VARINFO * varinfo = adios_inq_var (f, "temperature");
if (varinfo)
{
printf ("nsteps = %d\n", varinfo->nsteps);
for (i = 0; i < varinfo->nsteps; i++)
{
printf ("step: %d has %d", i, varinfo->nblocks[i]);
}
printf ("\n");
printf ("ndim = %d\n", varinfo->ndim);
printf ("dims = (");
datasize = 8;
for (i = 0; i < varinfo->ndim; i++)
{
datasize *= varinfo->dims[i];
printf ("%" PRIu64, varinfo->dims[i]);
if (i != varinfo->ndim - 1)
{
printf (",");
}
}
printf (")\n");
data = malloc (datasize);
/*
adios_inq_var_blockinfo (f, varinfo);
for (i = 0; i < varinfo->sum_nblocks; i++)
{
printf ("block[%d]: ", i);
printf ("start=");
for (j = 0; j < varinfo->ndim; j++)
{
printf ("%lu ", varinfo->blockinfo[i].start[j]);
}
printf ("count=");
for (j = 0; j < varinfo->ndim; j++)
{
printf ("%lu ", varinfo->blockinfo[i].count[j]);
}
printf ("\n");
}
*/
for (i = 0; i < varinfo->ndim; i++)
{
start[i] = 0;
count[i] = varinfo->dims[i];
}
sel1 = adios_selection_boundingbox (varinfo->ndim, start, count);
/*
npoints = 1;
for (i = 0; i < varinfo->ndim; i++)
{
npoints *= count[i];
}
points = (uint64_t *) malloc (npoints * varinfo->ndim * 8);
for (i = 0; i < npoints; i++)
{
uint64_t temp = i;
for (j = varinfo->ndim - 1; j > -1; j--)
{
points[i * varinfo->ndim + j] = temp % count[j];
temp = temp/count[j];
}
}
*/
/*
for (i = 0; i < npoints; i++)
{
printf ("(");
for (j = 0; j < varinfo->ndim; j++)
{
printf ("%lu ",points[i * varinfo->ndim + j]);
}
printf (")");
}
printf ("\n");
*/
/*
sel2 = adios_selection_points (varinfo->ndim, npoints, points);
*/
adios_schedule_read (f, sel1, "temperature", 0, 1, data);
/*
adios_schedule_read (f, sel2, "temperature", 0, 1, data);
*/
adios_perform_reads (f, 1);
#if 0
while (adios_check_reads (f, &chunk) > 0)
{
datasize = 1;
for (i = 0; i < varinfo->ndim; i++)
{
datasize *= chunk->sel->u.bb.count[i];
}
printf ("data:\n");
/*
for (i = 0; i < datasize; i ++)
{
printf ("%7.4f ", * ((double *)chunk->data + i));
}
printf ("\n");
*/
for (i = 0; i < 10; i ++)
{
printf ("%7.4f ", * ((double *)chunk->data + i));
}
printf ("\n");
adios_free_chunk (chunk);
}
#endif
adios_selection_delete (sel1);
/*
adios_selection_delete (sel2);
*/
}
adios_free_varinfo (varinfo);
adios_read_close (f);
}
adios_read_finalize_method (ADIOS_READ_METHOD_BP);
MPI_Finalize ();
return 0;
}
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