gsell
542daf7fc2
- define dummy MPI macros to be used in serial compilation, closing #10 - cleanup some "unused variable" warnings - fix some format warnings, using C99 format macros
78 lines
2.4 KiB
C
78 lines
2.4 KiB
C
/*
|
|
Copyright (c) 2006-2015, The Regents of the University of California,
|
|
through Lawrence Berkeley National Laboratory (subject to receipt of any
|
|
required approvals from the U.S. Dept. of Energy) and the Paul Scherrer
|
|
Institut (Switzerland). All rights reserved.
|
|
|
|
License: see file COPYING in top level of source distribution.
|
|
*/
|
|
|
|
#include "H5hut.h"
|
|
#include "examples.h"
|
|
|
|
#include <stdlib.h>
|
|
|
|
// name of input file
|
|
const char* fname = "example_setview.h5";
|
|
|
|
// H5hut verbosity level
|
|
const h5_int64_t h5_verbosity = H5_VERBOSE_DEFAULT;
|
|
|
|
int
|
|
main (
|
|
int argc, char* argv[]
|
|
){
|
|
|
|
// initialize MPI & H5hut
|
|
MPI_Init (&argc, &argv);
|
|
MPI_Comm comm = MPI_COMM_WORLD;
|
|
int comm_size = 1;
|
|
MPI_Comm_size (comm, &comm_size);
|
|
int comm_rank = 0;
|
|
MPI_Comm_rank (comm, &comm_rank);
|
|
H5AbortOnError ();
|
|
H5SetVerbosityLevel (h5_verbosity);
|
|
|
|
// open file and go to first step
|
|
h5_file_t file = H5OpenFile (fname, H5_O_RDONLY, H5_PROP_DEFAULT);
|
|
H5SetStep (file, 0);
|
|
|
|
// compute and set a "canonical" view:
|
|
// all cores get almost the same number of particles
|
|
h5_int64_t num_particles_total = H5PartGetNumParticles (file);
|
|
h5_int64_t num_particles = num_particles_total / comm_size;
|
|
h5_int64_t remainder = num_particles_total % comm_size;
|
|
h5_int64_t start = comm_rank * num_particles;
|
|
|
|
// adjust number of local particles
|
|
if (comm_rank < remainder)
|
|
num_particles++;
|
|
|
|
// adjust start
|
|
if (comm_rank < remainder)
|
|
start += comm_rank;
|
|
else
|
|
start += remainder;
|
|
|
|
// Note:
|
|
// setting end = start - 1 forces the selection of zero particles!
|
|
h5_int64_t end = start + num_particles - 1;
|
|
|
|
printf ("[proc %d]: set view to [%lld..%lld]\n", comm_rank, (long long)start, (long long)end);
|
|
H5PartSetView (file, start, end);
|
|
|
|
// read and print data
|
|
h5_int32_t* data = calloc (num_particles, sizeof (*data));
|
|
H5PartReadDataInt32 (file, "data", data);
|
|
for (int i = 0; i < num_particles; i++) {
|
|
printf ("[proc %d]: global index = %lld; local index = %d, value = %d\n",
|
|
comm_rank, (long long)(start+i), i, data[i]);
|
|
}
|
|
|
|
// cleanup
|
|
free (data);
|
|
H5CloseFile (file);
|
|
MPI_Finalize ();
|
|
return 0;
|
|
}
|