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81 lines
2.3 KiB
C
81 lines
2.3 KiB
C
/* $Id$ */
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/*
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* Parallel tests for file operations
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*/
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#include <testphdf5.h>
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/*
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* test file access by communicator besides COMM_WORLD.
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* Split COMM_WORLD into two, one (even_comm) contains the original
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* processes of even ranks. The other (odd_comm) contains the original
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* processes of odd ranks. Processes in even_comm creates a file, then
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* cloose it, using even_comm. Processes in old_comm just do a barrier
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* using odd_comm. Then they all do a barrier using COMM_WORLD.
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* If the file creation and cloose does not do correct collective action
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* according to the communicator argument, the processes will freeze up
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* sooner or later due to barrier mixed up.
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*/
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void
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test_split_comm_access(char *filename[])
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{
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int mpi_size, mpi_rank;
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MPI_Comm comm;
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MPI_Info info = MPI_INFO_NULL;
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int color, mrc;
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int newrank, newprocs;
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hid_t fid; /* file IDs */
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hid_t acc_tpl; /* File access properties */
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herr_t ret; /* generic return value */
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if (verbose)
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printf("Split Communicator access test on file %s %s\n",
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filename[0], filename[1]);
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/* set up MPI parameters */
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MPI_Comm_size(MPI_COMM_WORLD,&mpi_size);
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MPI_Comm_rank(MPI_COMM_WORLD,&mpi_rank);
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color = mpi_rank%2;
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mrc = MPI_Comm_split (MPI_COMM_WORLD, color, mpi_rank, &comm);
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VRFY((mrc==MPI_SUCCESS), "");
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MPI_Comm_size(comm,&newprocs);
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MPI_Comm_rank(comm,&newrank);
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if (color){
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/* odd-rank processes */
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mrc = MPI_Barrier(comm);
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VRFY((mrc==MPI_SUCCESS), "");
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}else{
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/* even-rank processes */
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int sub_mpi_rank; /* rank in the sub-comm */
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MPI_Comm_rank(comm,&sub_mpi_rank);
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/* setup file access template */
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acc_tpl = H5Pcreate (H5P_FILE_ACCESS);
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VRFY((acc_tpl != FAIL), "");
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/* set Parallel access with communicator */
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ret = H5Pset_mpi(acc_tpl, comm, info);
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VRFY((ret != FAIL), "");
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/* create the file collectively */
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fid=H5Fcreate(filename[color],H5F_ACC_TRUNC,H5P_DEFAULT,acc_tpl);
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VRFY((fid != FAIL), "H5Fcreate succeeded");
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/* Release file-access template */
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ret=H5Pclose(acc_tpl);
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VRFY((ret != FAIL), "");
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/* close the file */
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ret=H5Fclose(fid);
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VRFY((ret != FAIL), "");
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/* detele the test file */
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if (sub_mpi_rank == 0){
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mrc = MPI_File_delete(filename[color], info);
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VRFY((mrc==MPI_SUCCESS), "");
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}
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}
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}
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