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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "mpi.h"
#include "hdf5.h"
static char *random_hdf5_text =
"Now is the time for all first-time-users of HDF5 to read their manual or go thru the tutorials!\n\
While you\'re at it, now is also the time to read up on MPI-IO.";
static char *datafile_relocated = "relocated_super.h5";
hbool_t pass = true;
static void
generate_test_file( int mpi_rank, int mpi_size )
{
FILE *header;
char *datafile_base = "mytestfile.h5";
char *prologue_file = "hdf5_readme.txt";
hid_t file_id, memspace, filespace, attr_id, fapl_id, dxpl_id, dset_id;
hsize_t i, offset, count = 1000;
hsize_t dims[1] = {0};
float nextValue, data_slice[count];
pass = true;
nextValue = (float)(mpi_rank * count);
for(i=0; i<count; i++) {
data_slice[i] = nextValue;
nextValue += 1;
}
/* create the file (parallel) */
fapl_id = H5Pcreate(H5P_FILE_ACCESS);
H5Pset_fapl_mpio(fapl_id, MPI_COMM_WORLD, MPI_INFO_NULL);
file_id = H5Fcreate(datafile_base, H5F_ACC_TRUNC, H5P_DEFAULT, fapl_id);
if ( file_id < 0 ) {
pass = false;
HDfprintf(stderr, "FATAL: H5Fcreate failed!\n");
}
if ( pass ) {
dxpl_id = H5Pcreate(H5P_DATASET_XFER);
H5Pset_dxpl_mpio(dxpl_id, H5FD_MPIO_COLLECTIVE);
}
dims[0] = count;
memspace = H5Screate_simple(1, dims, NULL);
dims[0] *= mpi_size;
filespace = H5Screate_simple(1, dims, NULL);
offset = mpi_rank * count;
H5Sselect_hyperslab(filespace, H5S_SELECT_SET, &offset, NULL, &count, NULL);
dset_id = H5Dcreate2(file_id, "dataset0", H5T_NATIVE_FLOAT, filespace, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
if ( dset_id < 0 ) {
pass = false;
HDfprintf(stderr, "FATAL: H5Dcreate2 failed!\n");
}
if ( pass ) {
H5Dwrite(dset_id, H5T_NATIVE_FLOAT, memspace, filespace, dxpl_id, data_slice);
}
H5Dclose(dset_id);
H5Sclose(memspace);
H5Sclose(filespace);
/* finished creating a data file */
H5Fclose(file_id);
H5Pclose(dxpl_id);
if ( mpi_rank > 0 ) return;
/* ---- mpi_rank 0 ------*/
header = fopen( prologue_file, "w+");
if (header == NULL) {
pass = false;
HDfprintf(stderr, "FATAL: Unable to create a simple txt file\n");
return;
}
else {
size_t bytes_written, bytes_to_write = strlen(random_hdf5_text);
bytes_written = fwrite( random_hdf5_text, 1, bytes_to_write , header);
if (bytes_written == 0) {
pass = false;
HDfprintf(stderr, "FATAL: Unable to write a simple txt file\n");
}
fclose(header);
}
if ( pass ) {
char cmd[256];
sprintf(cmd, "../tools/src/h5jam/h5jam -i %s -u %s -o %s",
datafile_base, prologue_file, datafile_relocated);
system(cmd);
unlink(datafile_base);
unlink(prologue_file);
}
}
static void
test_parallel_read( int mpi_rank, int mpi_size )
{
int status, errors = 0;
hid_t access_plist = -1, dataset = -1;
hid_t file_id = -1, memspace = -1, dataspace = -1;
hsize_t i, offset, count = 1000;
hsize_t dims[1] = {0};
float nextValue, data_slice[count];
herr_t ret;
access_plist = H5Pcreate(H5P_FILE_ACCESS);
if (access_plist >= 0) {
ret = H5Pset_fapl_mpio(access_plist, MPI_COMM_WORLD, MPI_INFO_NULL);
} else pass = false;
if (ret >= 0) {
file_id = H5Fopen(datafile_relocated,H5F_ACC_RDONLY,access_plist);
} else pass = false;
if (file_id >= 0) {
dataset = H5Dopen2(file_id, "dataset0", H5P_DEFAULT);
} else pass = false;
if (dataset >= 0) {
dims[0] = count;
memspace = H5Screate_simple(1, dims, NULL);
} else pass = false;
if ( memspace >= 0 ) {
dataspace = H5Dget_space(dataset);
} else pass = false;
if ( dataspace >= 0 ) {
offset = mpi_rank * count;
ret = H5Sselect_hyperslab(dataspace, H5S_SELECT_SET, &offset, NULL, &count, NULL);
} else pass = false;
if ( ret >= 0 ) {
ret = H5Dread(dataset, H5T_NATIVE_FLOAT, memspace, dataspace, H5P_DEFAULT, data_slice);
} else pass = false;
if (ret >= 0) {
nextValue = (float)(mpi_rank * count);
for (i=0; i < count; i++) {
if (data_slice[i] != nextValue) pass = false;
nextValue += 1;
}
} else pass = false;
status = ( pass ? 0 : -1 );
MPI_Allreduce( &status, &errors, 1, MPI_INT, MPI_SUM, MPI_COMM_WORLD );
if ( mpi_rank == 0)
HDfprintf(stderr, "H5Fopen/H5Dread/data_validation %s\n", ((errors == 0) ? "succeeded" : "FAILED"));
H5Pclose(access_plist);
H5Dclose(dataset);
H5Fclose(file_id);
/* Cleanup */
unlink(datafile_relocated);
return;
}
int
main( int argc, char **argv)
{
int status, errors, mpi_rank, mpi_size;
if ((status = MPI_Init(&argc, &argv)) != MPI_SUCCESS) {
HDfprintf(stderr, "FATAL: Unable to initialize MPI\n");
exit(1);
}
if ((status = MPI_Comm_rank(MPI_COMM_WORLD, &mpi_rank)) != MPI_SUCCESS) {
HDfprintf(stderr, "FATAL: MPI_Comm_rank returned an error\n");
exit(2);
}
if ((status = MPI_Comm_size(MPI_COMM_WORLD, &mpi_size)) != MPI_SUCCESS) {
HDfprintf(stderr, "FATAL: MPI_Comm_size returned an error\n");
exit(2);
}
generate_test_file( mpi_rank, mpi_size );
status = ( pass ? 0 : -1 );
/* Synch all ranks before attempting the parallel read */
if ( MPI_Allreduce( &status, &errors, 1, MPI_INT, MPI_SUM, MPI_COMM_WORLD ) != MPI_SUCCESS) {
pass = false;
if (mpi_rank == 0) HDfprintf(stderr, "FATAL: MPI_Allreduce returned an error\n");
}
if ( errors == 0 ) {
test_parallel_read( mpi_rank, mpi_size );
}
MPI_Finalize();
return 0;
}
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