80 lines
2.0 KiB
C
80 lines
2.0 KiB
C
/*
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Copyright (c) 2006-2015, The Regents of the University of California,
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through Lawrence Berkeley National Laboratory (subject to receipt of any
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required approvals from the U.S. Dept. of Energy) and the Paul Scherrer
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Institut (Switzerland). All rights reserved.
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License: see file COPYING in top level of source distribution.
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*/
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#include "H5hut.h"
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// name of output file
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const char* fname = "example_setnparticles.h5";
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// H5hut verbosity level
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const h5_int64_t h5_verbosity = H5_VERBOSE_DEFAULT;
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// number of particles we are going to write per core
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const ssize_t dim_x = 32;
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const ssize_t dim_y = 8;
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const ssize_t dim_z = 8;
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#define idx(i, j, k) (i + j*dim_y + k*dim_x*dim_y)
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int
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main (
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int argc,
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char* argv[]
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){
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// initialize MPI & H5hut
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MPI_Init (&argc, &argv);
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MPI_Comm comm = MPI_COMM_WORLD;
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int comm_size = 1;
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MPI_Comm_size (comm, &comm_size);
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int comm_rank = 0;
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MPI_Comm_rank (comm, &comm_rank);
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H5AbortOnError ();
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H5SetVerbosityLevel (h5_verbosity);
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H5SetDebugMask (-1);
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// slice field in X direction
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ssize_t n_slices = dim_x / comm_size;
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ssize_t remaining_slices = dim_x % comm_size;
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ssize_t i_start = comm_rank * n_slices;
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if (comm_rank < remaining_slices) {
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n_slices++;
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i_start += comm_rank;
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} else {
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i_start += remaining_slices;
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}
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ssize_t i_end = i_start + n_slices;
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// create fake data
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h5_int64_t data[(i_end-i_start+1) * dim_y * dim_z];
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for (int k = 0; k < dim_z; k++) {
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for (int j = 0; j < dim_y; j++) {
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for (int i = i_start; i < i_end; i++) {
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data[idx(i-i_start,j,k)] = (h5_int64_t)idx(i,j,k);
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}
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}
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}
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// open file and create first step
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h5_file_t file = H5OpenFile (fname, H5_O_WRONLY, H5_PROP_DEFAULT);
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H5SetStep (file, 0);
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H5Block3dSetView (file, i_start, i_end, 0, dim_y-1, 0, dim_z-1);
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// write data
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H5Block3dWriteScalarFieldInt64 (file, "data", data);
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// done
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H5CloseFile(file);
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MPI_Finalize ();
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return 0;
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}
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