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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* Copyright by the Board of Trustees of the University of Illinois. *
* All rights reserved. *
* *
* This file is part of HDF5. The full HDF5 copyright notice, including *
* terms governing use, modification, and redistribution, is contained in *
* the COPYING file, which can be found at the root of the source code *
* distribution tree, or in https://www.hdfgroup.org/licenses. *
* If you do not have access to either file, you may request a copy from *
* help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*
* Parallel tests for file operations
*/
#include "testphdf5.h"
/*
* test file access by communicator besides COMM_WORLD.
* Split COMM_WORLD into two, one (even_comm) contains the original
* processes of even ranks. The other (odd_comm) contains the original
* processes of odd ranks. Processes in even_comm creates a file, then
* cloose it, using even_comm. Processes in old_comm just do a barrier
* using odd_comm. Then they all do a barrier using COMM_WORLD.
* If the file creation and cloose does not do correct collective action
* according to the communicator argument, the processes will freeze up
* sooner or later due to barrier mixed up.
*/
void
test_split_comm_access(void)
{
int mpi_size, mpi_rank;
MPI_Comm comm;
MPI_Info info = MPI_INFO_NULL;
int is_old, mrc;
int newrank, newprocs;
hid_t fid; /* file IDs */
hid_t acc_tpl; /* File access properties */
herr_t ret; /* generic return value */
const char *filename;
filename = (const char *)GetTestParameters();
if (VERBOSE_MED)
HDprintf("Split Communicator access test on file %s\n", filename);
/* set up MPI parameters */
MPI_Comm_size(MPI_COMM_WORLD, &mpi_size);
MPI_Comm_rank(MPI_COMM_WORLD, &mpi_rank);
is_old = mpi_rank % 2;
mrc = MPI_Comm_split(MPI_COMM_WORLD, is_old, mpi_rank, &comm);
VRFY((mrc == MPI_SUCCESS), "");
MPI_Comm_size(comm, &newprocs);
MPI_Comm_rank(comm, &newrank);
if (is_old) {
/* odd-rank processes */
mrc = MPI_Barrier(comm);
VRFY((mrc == MPI_SUCCESS), "");
}
else {
/* even-rank processes */
int sub_mpi_rank; /* rank in the sub-comm */
MPI_Comm_rank(comm, &sub_mpi_rank);
/* setup file access template */
acc_tpl = create_faccess_plist(comm, info, facc_type);
VRFY((acc_tpl >= 0), "");
/* create the file collectively */
fid = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, acc_tpl);
VRFY((fid >= 0), "H5Fcreate succeeded");
/* Release file-access template */
ret = H5Pclose(acc_tpl);
VRFY((ret >= 0), "");
/* close the file */
ret = H5Fclose(fid);
VRFY((ret >= 0), "");
/* delete the test file */
if (sub_mpi_rank == 0) {
mrc = MPI_File_delete((char *)filename, info);
/*VRFY((mrc==MPI_SUCCESS), ""); */
}
}
mrc = MPI_Comm_free(&comm);
VRFY((mrc == MPI_SUCCESS), "MPI_Comm_free succeeded");
mrc = MPI_Barrier(MPI_COMM_WORLD);
VRFY((mrc == MPI_SUCCESS), "final MPI_Barrier succeeded");
}
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