diff options
Diffstat (limited to 'testpar/t_pread.c')
| -rw-r--r-- | testpar/t_pread.c | 183 |
1 files changed, 152 insertions, 31 deletions
diff --git a/testpar/t_pread.c b/testpar/t_pread.c index ecc7360..48c14a9 100644 --- a/testpar/t_pread.c +++ b/testpar/t_pread.c @@ -35,15 +35,36 @@ static const char *random_hdf5_text = manual or go thru the tutorials!\n\ While you\'re at it, now is also the time to read up on MPI-IO."; -static int generate_test_file(int mpi_rank, int mpi_size); -static int test_parallel_read(int mpi_rank); +static const char *hitchhiker_quote = +"A common mistake that people make when trying to design something\n\ +completely foolproof is to underestimate the ingenuity of complete\n\ +fools.\n"; + +static int generate_test_file(MPI_Comm comm, int mpi_rank, int group); +static int test_parallel_read(MPI_Comm comm, int mpi_rank, int group); /*------------------------------------------------------------------------- * Function: generate_test_file * - * Purpose: *** Richard -- please fill this in *** + * Purpose: This function is called to produce an HDF5 data file + * whose superblock is relocated to a non-zero offset by + * utilizing the 'h5jam' utility to write random text + * at the start of the file. Unlike simple concatenation + * of files, h5jam is used to place the superblock on a + * power-of-2 boundary. + * + * Since data will be read back and validated, we generate + * data in a predictable manner rather than randomly. + * For now, we simply use the mpi_rank of the writing + * process as a starting component of the data generation. + * Subsequent writes are increments from the initial start + * value. * + * In the overall scheme of running the test, we'll call + * this function twice so as to create two seperate files. + * Each file will serve as the input data for two + * independent parallel reads. * * Return: Success: 0 * @@ -57,14 +78,17 @@ static int test_parallel_read(int mpi_rank); *------------------------------------------------------------------------- */ static int -generate_test_file( int mpi_rank, int mpi_size ) +generate_test_file( MPI_Comm comm, int mpi_rank, int group_id ) { FILE *header; const char *fcn_name = "generate_test_file()"; const char *failure_mssg = NULL; + char group_file[FILENAME_BUF_SIZE]; char data_filename[FILENAME_BUF_SIZE]; char reloc_data_filename[FILENAME_BUF_SIZE]; char prolog_filename[FILENAME_BUF_SIZE]; + int group_size; + int group_rank; int local_failure = 0; int global_failures = 0; hsize_t count = COUNT; @@ -82,6 +106,18 @@ generate_test_file( int mpi_rank, int mpi_size ) pass = true; + HDassert(comm != MPI_COMM_NULL); + + if ( (MPI_Comm_rank(comm, &group_rank)) != MPI_SUCCESS) { + pass = FALSE; + failure_mssg = "generate_test_file: MPI_Comm_rank failed.\n"; + } + + if ( (MPI_Comm_size(comm, &group_size)) != MPI_SUCCESS) { + pass = FALSE; + failure_mssg = "generate_test_file: MPI_Comm_size failed.\n"; + } + if ( mpi_rank == 0 ) { HDfprintf(stdout, "Constructing test files..."); @@ -90,8 +126,11 @@ generate_test_file( int mpi_rank, int mpi_size ) /* setup the file names */ if ( pass ) { HDassert(FILENAMES[0]); - - if ( h5_fixname(FILENAMES[0], H5P_DEFAULT, data_filename, + if ( HDsprintf(group_file, "%s_%d", FILENAMES[0], group_id) < 0) { + pass = FALSE; + failure_mssg = "HDsprintf(0) failed.\n"; + } + else if ( h5_fixname(group_file, H5P_DEFAULT, data_filename, sizeof(data_filename)) == NULL ) { pass = FALSE; failure_mssg = "h5_fixname(0) failed.\n"; @@ -100,8 +139,11 @@ generate_test_file( int mpi_rank, int mpi_size ) if ( pass ) { HDassert(FILENAMES[1]); - - if ( h5_fixname(FILENAMES[1], H5P_DEFAULT, reloc_data_filename, + if ( HDsprintf(group_file, "%s_%d", FILENAMES[1], group_id) < 0) { + pass = FALSE; + failure_mssg = "HDsprintf(1) failed.\n"; + } + else if ( h5_fixname(group_file, H5P_DEFAULT, reloc_data_filename, sizeof(reloc_data_filename)) == NULL ) { pass = FALSE; @@ -111,8 +153,11 @@ generate_test_file( int mpi_rank, int mpi_size ) if ( pass ) { HDassert(FILENAMES[2]); - - if ( h5_fixname(FILENAMES[2], H5P_DEFAULT, prolog_filename, + if ( HDsprintf(group_file, "%s_%d", FILENAMES[2], group_id) < 0) { + pass = FALSE; + failure_mssg = "HDsprintf(2) failed.\n"; + } + else if ( h5_fixname(group_file, H5P_DEFAULT, prolog_filename, sizeof(prolog_filename)) == NULL ) { pass = FALSE; failure_mssg = "h5_fixname(2) failed.\n"; @@ -145,7 +190,7 @@ generate_test_file( int mpi_rank, int mpi_size ) } if ( pass ) { - if ( (H5Pset_fapl_mpio(fapl_id, MPI_COMM_WORLD, MPI_INFO_NULL)) < 0 ) { + if ( (H5Pset_fapl_mpio(fapl_id, comm, MPI_INFO_NULL)) < 0 ) { pass = FALSE; failure_mssg = "H5Pset_fapl_mpio() failed\n"; } @@ -184,7 +229,7 @@ generate_test_file( int mpi_rank, int mpi_size ) } if ( pass ) { - dims[0] *= (hsize_t)mpi_size; + dims[0] *= (hsize_t)group_size; if ( (filespace = H5Screate_simple(1, dims, NULL)) < 0 ) { pass = FALSE; failure_mssg = "H5Screate_simple(1, dims, NULL) failed (2).\n"; @@ -192,7 +237,7 @@ generate_test_file( int mpi_rank, int mpi_size ) } if ( pass ) { - offset = (hsize_t)mpi_rank * (hsize_t)COUNT; + offset = (hsize_t)group_rank * (hsize_t)COUNT; if ( (H5Sselect_hyperslab(filespace, H5S_SELECT_SET, &offset, NULL, &count, NULL)) < 0 ) { pass = FALSE; @@ -266,11 +311,17 @@ generate_test_file( int mpi_rank, int mpi_size ) * * Also delete files that are no longer needed. */ - if ( mpi_rank == 0 ) { + if ( group_rank == 0 ) { + const char *text_to_write; size_t bytes_to_write; - bytes_to_write = strlen(random_hdf5_text); + if (group_id == 0) + text_to_write = random_hdf5_text; + else + text_to_write = hitchhiker_quote; + + bytes_to_write = strlen(text_to_write); if ( pass ) { if ( (header = HDfopen(prolog_filename, "w+")) == NULL ) { @@ -280,8 +331,8 @@ generate_test_file( int mpi_rank, int mpi_size ) } if ( pass ) { - bytes_to_write = strlen(random_hdf5_text); - if ( HDfwrite(random_hdf5_text, 1, bytes_to_write, header) != + + if ( HDfwrite(text_to_write, 1, bytes_to_write, header) != bytes_to_write ) { pass = FALSE; failure_mssg = "Unable to write header file.\n"; @@ -319,6 +370,7 @@ generate_test_file( int mpi_rank, int mpi_size ) */ local_failure = ( pass ? 0 : 1 ); + /* This is a global all reduce (NOT group specific) */ if ( MPI_Allreduce(&local_failure, &global_failures, 1, MPI_INT, MPI_SUM, MPI_COMM_WORLD) != MPI_SUCCESS ) { if ( pass ) { @@ -355,8 +407,25 @@ generate_test_file( int mpi_rank, int mpi_size ) /*------------------------------------------------------------------------- * Function: test_parallel_read * - * Purpose: *** Richard -- please fill this in *** + * Purpose: This actually tests the superblock optimization + * and covers the two primary cases we're interested in. + * 1). That HDF5 files can be opened in parallel by + * the rank 0 process and that the superblock + * offset is correctly broadcast to the other + * parallel file readers. + * 2). That a parallel application can correctly + * handle reading multiple files by using + * subgroups of MPI_COMM_WORLD and that each + * subgroup operates as described in (1) to + * collectively read the data. * + * The global MPI rank is used for reading and + * writing data for process specific data in the + * dataset. We do this rather simplisticly, i.e. + * rank 0: writes/reads 0-9999 + * rank 1: writes/reads 1000-1999 + * rank 2: writes/reads 2000-2999 + * ... * * Return: Success: 0 * @@ -370,13 +439,16 @@ generate_test_file( int mpi_rank, int mpi_size ) *------------------------------------------------------------------------- */ static int -test_parallel_read(int mpi_rank) +test_parallel_read(MPI_Comm comm, int mpi_rank, int group_id) { const char *failure_mssg; const char *fcn_name = "test_parallel_read()"; + char group_file[FILENAME_BUF_SIZE]; char reloc_data_filename[FILENAME_BUF_SIZE]; int local_failure = 0; int global_failures = 0; + int group_size; + int group_rank; hid_t fapl_id; hid_t file_id; hid_t dset_id; @@ -391,6 +463,18 @@ test_parallel_read(int mpi_rank) pass = TRUE; + HDassert(comm != MPI_COMM_NULL); + + if ( (MPI_Comm_rank(comm, &group_rank)) != MPI_SUCCESS) { + pass = FALSE; + failure_mssg = "test_parallel_read: MPI_Comm_rank failed.\n"; + } + + if ( (MPI_Comm_size(comm, &group_size)) != MPI_SUCCESS) { + pass = FALSE; + failure_mssg = "test_parallel_read: MPI_Comm_size failed.\n"; + } + if ( mpi_rank == 0 ) { TESTING("parallel file open test 1"); @@ -408,8 +492,11 @@ test_parallel_read(int mpi_rank) /* construct file file name */ if ( pass ) { HDassert(FILENAMES[1]); - - if ( h5_fixname(FILENAMES[1], H5P_DEFAULT, reloc_data_filename, + if ( HDsprintf(group_file, "%s_%d", FILENAMES[1], group_id) < 0) { + pass = FALSE; + failure_mssg = "HDsprintf(0) failed.\n"; + } + else if ( h5_fixname(group_file, H5P_DEFAULT, reloc_data_filename, sizeof(reloc_data_filename)) == NULL ) { pass = FALSE; @@ -426,7 +513,7 @@ test_parallel_read(int mpi_rank) } if ( pass ) { - if ( (H5Pset_fapl_mpio(fapl_id, MPI_COMM_WORLD, MPI_INFO_NULL)) < 0 ) { + if ( (H5Pset_fapl_mpio(fapl_id, comm, MPI_INFO_NULL)) < 0 ) { pass = FALSE; failure_mssg = "H5Pset_fapl_mpio() failed\n"; } @@ -467,7 +554,7 @@ test_parallel_read(int mpi_rank) } if ( pass ) { - offset = (hsize_t)mpi_rank * count; + offset = (hsize_t)group_rank * count; if ( (H5Sselect_hyperslab(filespace, H5S_SELECT_SET, &offset, NULL, &count, NULL)) < 0 ) { pass = FALSE; @@ -557,7 +644,7 @@ test_parallel_read(int mpi_rank) } /* report results and finish cleanup */ - if ( mpi_rank == 0 ) { + if ( group_rank == 0 ) { if ( pass ) { PASSED(); } else { @@ -584,8 +671,17 @@ test_parallel_read(int mpi_rank) /*------------------------------------------------------------------------- * Function: main * - * Purpose: *** Richard -- please fill this in *** + * Purpose: To implement a parallel test which validates whether the + * new superblock lookup functionality is working correctly. * + * The test consists of creating two seperate HDF datasets + * in which random text is inserted at the start of each + * file using the 'j5jam' application. This forces the + * HDF5 file superblock to a non-zero offset. + * Having created the two independant files, we create two + * non-overlapping MPI groups, each of which is then tasked + * with the opening and validation of the data contained + * therein. * * WARNING: This test uses fork() and execve(), and * therefore will not run on Windows. @@ -606,8 +702,11 @@ int main( int argc, char **argv) { int nerrs = 0; + int which_group; int mpi_rank; int mpi_size; + int split_size; + MPI_Comm group_comm = MPI_COMM_NULL; if ( (MPI_Init(&argc, &argv)) != MPI_SUCCESS) { HDfprintf(stderr, "FATAL: Unable to initialize MPI\n"); @@ -633,21 +732,37 @@ main( int argc, char **argv) HDfprintf(stdout, "========================================\n"); } - if ( mpi_size < 2 ) { + if ( mpi_size < 4 ) { if ( mpi_rank == 0 ) { - HDprintf(" Need at least 2 processes. Exiting.\n"); + HDprintf(" Need at least 4 processes. Exiting.\n"); } goto finish; } + /* Divide the available processes into two groups + * that are the same size (plus or minus). + */ + split_size = mpi_size / 2; + which_group = (mpi_rank < split_size ? 0 : 1); + + if ( (MPI_Comm_split(MPI_COMM_WORLD, + which_group, + 0, + &group_comm)) != MPI_SUCCESS) { + + HDfprintf(stderr, "FATAL: MPI_Comm_split returned an error\n"); + exit(2); + } + + /* create the test files & verify that the process * succeeded. If not, abort the remaining tests as * they depend on the test files. */ - nerrs += generate_test_file( mpi_rank, mpi_size ); + nerrs += generate_test_file( group_comm, mpi_rank, which_group ); /* abort tests if there were any errors in test file construction */ if ( nerrs > 0 ) { @@ -655,13 +770,19 @@ main( int argc, char **argv) HDprintf(" Test file construction failed -- skipping tests.\n"); } goto finish; - } + } - /* run the tests */ - nerrs += test_parallel_read(mpi_rank); + /* run the tests */ + nerrs += test_parallel_read(group_comm, mpi_rank, which_group); finish: + if ((group_comm != MPI_COMM_NULL) && + (MPI_Comm_free(&group_comm)) != MPI_SUCCESS) { + HDfprintf(stderr, "MPI_Comm_free failed!\n"); + } + + /* make sure all processes are finished before final report, cleanup * and exit. */ |