path: root/test/swmr_start_write.c

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by The HDF Group.                                               *
 * 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.                                                        *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/*-------------------------------------------------------------------------
 *
 * Created:     swmr_start_write.c
 *
 * Purpose:     This program enables SWMR writing mode via H5Fstart_swmr_write().
 *              It writes data to a randomly selected subset of the datasets
 *              in the SWMR test file; and it is intended to run concurrently
 *              with the swmr_reader program.
 *
 * NOTE: The routines in this program are basically copied and modified from
 *          swmr*.c.
 *-------------------------------------------------------------------------
 */

/***********/
/* Headers */
/***********/

#include "h5test.h"
#include "swmr_common.h"

/********************/
/* Local Prototypes */
/********************/

static hid_t create_file(const char *filename, bool verbose, FILE *verbose_file, unsigned random_seed);
static int   create_datasets(hid_t fid, int comp_level, bool verbose, FILE *verbose_file,
                             const char *index_type);
static int   add_records(hid_t fid, bool verbose, FILE *verbose_file, unsigned long nrecords,
                         unsigned long flush_count);
static void  usage(void);

#define CHUNK_SIZE 50 /* Chunk size for created datasets */

/*-------------------------------------------------------------------------
 * Function:    create_file
 *
 * Purpose:     Creates the HDF5 file (without SWMR access) which
 *              which will be used for testing H5Fstart_swmr_write().
 *
 * Parameters:
 *              filename: The SWMR test file's name.
 *              verbose: whether verbose console output is desired.
 *              verbose_file: file pointer for verbose output
 *              random_seed: The random seed to store in the file.
 *              The sparse tests use this value.
 *
 * Return:      Success:    the file ID
 *              Failure:     -1
 *
 *-------------------------------------------------------------------------
 */
static hid_t
create_file(const char *filename, bool verbose, FILE *verbose_file, unsigned random_seed)
{
    hid_t fid;  /* File ID for new HDF5 file */
    hid_t fcpl; /* File creation property list */
    hid_t fapl; /* File access property list */
    hid_t sid;  /* Dataspace ID */
    hid_t aid;  /* Attribute ID */

    assert(filename);

    /* Create file access property list */
    if ((fapl = h5_fileaccess()) < 0)
        return -1;

    /* We ALWAYS select the latest file format for SWMR */
    if (H5Pset_libver_bounds(fapl, H5F_LIBVER_LATEST, H5F_LIBVER_LATEST) < 0)
        return -1;

    /* Create file creation property list */
    if ((fcpl = H5Pcreate(H5P_FILE_CREATE)) < 0)
        return -1;

    /* Emit informational message */
    if (verbose)
        fprintf(verbose_file, "Creating file without SWMR access\n");

    /* Create the file */
    if ((fid = H5Fcreate(filename, H5F_ACC_TRUNC, fcpl, fapl)) < 0)
        return -1;

    /* Close file creation property list */
    if (H5Pclose(fcpl) < 0)
        return -1;

    /* Close file access property list */
    if (H5Pclose(fapl) < 0)
        return -1;

    /* Create attribute with (shared) random number seed - for sparse test */
    if ((sid = H5Screate(H5S_SCALAR)) < 0)
        return -1;
    if ((aid = H5Acreate2(fid, "seed", H5T_NATIVE_UINT, sid, H5P_DEFAULT, H5P_DEFAULT)) < 0)
        return -1;
    if (H5Awrite(aid, H5T_NATIVE_UINT, &random_seed) < 0)
        return -1;
    if (H5Sclose(sid) < 0)
        return -1;
    if (H5Aclose(aid) < 0)
        return -1;

    return fid;
} /* end create_file() */

/*-------------------------------------------------------------------------
 * Function:    create_datasets
 *
 * Purpose:     Create datasets (and keep them opened) which will be used for testing
 *              H5Fstart_swmr_write().
 *
 * Parameters:
 *              fid: file ID for the SWMR test file
 *              comp_level: the compression level
 *              index_type: The chunk index type (b1 | b2 | ea | fa)
 *              verbose: whether verbose console output is desired.
 *              verbose_file: file pointer for verbose output
 *
 * Return:      Success:    0
 *              Failure:    -1
 *
 *-------------------------------------------------------------------------
 */
static int
create_datasets(hid_t fid, int comp_level, bool verbose, FILE *verbose_file, const char *index_type)
{
    hid_t    dcpl;                               /* Dataset creation property list */
    hid_t    tid;                                /* Datatype for dataset elements */
    hid_t    sid;                                /* Dataspace ID */
    hsize_t  dims[2]       = {1, 0};             /* Dataset starting dimensions */
    hsize_t  max_dims[2]   = {1, H5S_UNLIMITED}; /* Dataset maximum dimensions */
    hsize_t  chunk_dims[2] = {1, CHUNK_SIZE};    /* Chunk dimensions */
    unsigned u, v;                               /* Local index variable */

    assert(index_type);

    /* Create datatype for creating datasets */
    if ((tid = create_symbol_datatype()) < 0)
        return -1;

    /* There are two chunk indexes tested here.
     * With one unlimited dimension, we get the extensible array index
     * type, with two unlimited dimensions, we get a v-2 B-tree.
     */
    if (!strcmp(index_type, "b2"))
        max_dims[0] = H5S_UNLIMITED;

    /* Create dataspace for creating datasets */
    if ((sid = H5Screate_simple(2, dims, max_dims)) < 0)
        return -1;

    /* Create dataset creation property list */
    if ((dcpl = H5Pcreate(H5P_DATASET_CREATE)) < 0)
        return -1;
    if (H5Pset_chunk(dcpl, 2, chunk_dims) < 0)
        return -1;
    if (comp_level >= 0) {
        if (H5Pset_deflate(dcpl, (unsigned)comp_level) < 0)
            return -1;
    } /* end if */

    /* Emit informational message */
    if (verbose)
        fprintf(verbose_file, "Creating datasets\n");

    /* Create the datasets */
    for (u = 0; u < NLEVELS; u++)
        for (v = 0; v < symbol_count[u]; v++) {

            if ((symbol_info[u][v].dsid =
                     H5Dcreate2(fid, symbol_info[u][v].name, tid, sid, H5P_DEFAULT, dcpl, H5P_DEFAULT)) < 0)
                return -1;
            symbol_info[u][v].nrecords = 0;

        } /* end for */

    return 0;
} /* create_datasets() */

/*-------------------------------------------------------------------------
 * Function:    add_records
 *
 * Purpose:     Writes a specified number of records to random datasets in
 *              the SWMR test file.
 *
 * Parameters:
 *              fid: The file ID of the SWMR HDF5 file
 *              verbose: Whether or not to emit verbose console messages
 *              verbose_file: file pointer for verbose output
 *              nrecords: # of records to write to the datasets
 *              flush_count: # of records to write before flushing the file to disk
 *
 * Return:      Success: 0
 *              Failure: -1
 *
 *-------------------------------------------------------------------------
 */
static int
add_records(hid_t fid, bool verbose, FILE *verbose_file, unsigned long nrecords, unsigned long flush_count)
{
    hid_t         tid;                                  /* Datatype ID for records */
    hid_t         mem_sid;                              /* Memory dataspace ID */
    hsize_t       start[2] = {0, 0}, count[2] = {1, 1}; /* Hyperslab selection values */
    hsize_t       dim[2] = {1, 0};                      /* Dataspace dimensions */
    symbol_t      record;                               /* The record to add to the dataset */
    unsigned long rec_to_flush;                         /* # of records left to write before flush */
    unsigned long u, v;                                 /* Local index variables */

    assert(fid >= 0);

    /* Reset the record */
    /* (record's 'info' field might need to change for each record written, also) */
    memset(&record, 0, sizeof(record));

    /* Create a dataspace for the record to add */
    if ((mem_sid = H5Screate(H5S_SCALAR)) < 0)
        return -1;

    /* Create datatype for appending records */
    if ((tid = create_symbol_datatype()) < 0)
        return -1;

    /* Add records to random datasets, according to frequency distribution */
    rec_to_flush = flush_count;
    for (u = 0; u < nrecords; u++) {
        symbol_info_t *symbol;   /* Symbol to write record to */
        hid_t          file_sid; /* Dataset's space ID */

        /* Get a random dataset, according to the symbol distribution */
        symbol = choose_dataset();

        /* Set the record's ID (equal to its position) */
        record.rec_id = symbol->nrecords;

        /* Get the coordinate to write */
        start[1] = symbol->nrecords;

        /* Cork the metadata cache, to prevent the object header from being
         * flushed before the data has been written */
        if (H5Odisable_mdc_flushes(symbol->dsid) < 0)
            return -1;

        /* Extend the dataset's dataspace to hold the new record */
        symbol->nrecords++;
        dim[1] = symbol->nrecords;
        if (H5Dset_extent(symbol->dsid, dim) < 0)
            return -1;

        /* Get the dataset's dataspace */
        if ((file_sid = H5Dget_space(symbol->dsid)) < 0)
            return -1;

        /* Choose the last record in the dataset */
        if (H5Sselect_hyperslab(file_sid, H5S_SELECT_SET, start, NULL, count, NULL) < 0)
            return -1;

        /* Write record to the dataset */
        if (H5Dwrite(symbol->dsid, tid, mem_sid, file_sid, H5P_DEFAULT, &record) < 0)
            return -1;

        /* Uncork the metadata cache */
        if (H5Oenable_mdc_flushes(symbol->dsid) < 0)
            return -1;

        /* Close the dataset's dataspace */
        if (H5Sclose(file_sid) < 0)
            return -1;

        /* Check for flushing file */
        if (flush_count > 0) {
            /* Decrement count of records to write before flushing */
            rec_to_flush--;

            /* Check for counter being reached */
            if (0 == rec_to_flush) {
                /* Flush contents of file */
                if (H5Fflush(fid, H5F_SCOPE_GLOBAL) < 0)
                    return -1;

                /* Reset flush counter */
                rec_to_flush = flush_count;
            } /* end if */
        }     /* end if */
    }         /* end for */

    /* Close the memory dataspace */
    if (H5Sclose(mem_sid) < 0)
        return -1;

    /* Close the datatype */
    if (H5Tclose(tid) < 0)
        return -1;

    /* Emit informational message */
    if (verbose)
        fprintf(verbose_file, "Closing datasets\n");

    /* Close the datasets */
    for (u = 0; u < NLEVELS; u++)
        for (v = 0; v < symbol_count[u]; v++)
            if (H5Dclose(symbol_info[u][v].dsid) < 0)
                return -1;

    return 0;
} /* add_records() */

static void
usage(void)
{
    printf("\n");
    printf("Usage error!\n");
    printf("\n");
    printf("Usage: swmr_start_write [-f <# of records to write between flushing file contents>]\n");
    printf("    [-i <index type>] [-c <deflate compression level>]\n");
    printf("    [-r <random seed>] [-q] <# of records>\n");
    printf("\n");
    printf("<# of records to write between flushing file contents> should be 0\n");
    printf("(for no flushing) or between 1 and (<# of records> - 1).\n");
    printf("\n");
    printf("<index type> should be b2 or ea\n");
    printf("\n");
    printf("<deflate compression level> should be -1 (for no compression) or 0-9\n");
    printf("\n");
    printf("<# of records> must be specified.\n");
    printf("\n");
    printf("Defaults to flushing every 10000 records ('-f 10000'),\n");
    printf("v1 b-tree indexing (-i b1), compression ('-c -1'),\n");
    printf("will generate a random seed (no -r given), and verbose (no '-q' given)\n");
    printf("\n");
    exit(EXIT_FAILURE);
} /* usage() */

/*
 * Can test with different scenarios as below:
 *	1) create_file(), create_datasets(), H5Fstart_swmr_write(), add_records(), H5Fclose().
 *	2) create_file(), create_close_datasets(), open_datasets(), H5Fstart_swmr_write(), add_records(),
 *H5Fclose(). 3) create_file(), create_close_datasets(), H5Fclose(), open_file(), open_dataset(),
 *H5Fstart_swmr_write(), add_records(), H5Fclose().
 */
int
main(int argc, char *argv[])
{
    hid_t       fid;                  /* File ID for file opened */
    long        nrecords     = 0;     /* # of records to append */
    long        flush_count  = 10000; /* # of records to write between flushing file */
    bool        verbose      = true;  /* Whether to emit some informational messages */
    FILE       *verbose_file = NULL;  /* File handle for verbose output */
    bool        use_seed     = false; /* Set to true if a seed was set on the command line */
    unsigned    random_seed  = 0;     /* Random # seed */
    int         comp_level   = -1;    /* Compression level (-1 is no compression) */
    const char *index_type   = "b1";  /* Chunk index type */
    unsigned    u;                    /* Local index variable */
    int         temp;                 /* Temporary variable */

    /* Parse command line options */
    if (argc < 2)
        usage();
    if (argc > 1) {
        u = 1;
        while (u < (unsigned)argc) {
            if (argv[u][0] == '-') {
                switch (argv[u][1]) {
                    /* Compress dataset chunks */
                    case 'c':
                        comp_level = atoi(argv[u + 1]);
                        if (comp_level < -1 || comp_level > 9)
                            usage();
                        u += 2;
                        break;

                    /* Chunk index type */
                    case 'i':
                        index_type = argv[u + 1];
                        if (strcmp(index_type, "ea") != 0 && strcmp(index_type, "b2") != 0)
                            usage();
                        u += 2;
                        break;

                    /* # of records to write between flushing file */
                    case 'f':
                        flush_count = atol(argv[u + 1]);
                        if (flush_count < 0)
                            usage();
                        u += 2;
                        break;

                    /* Be quiet */
                    case 'q':
                        verbose = false;
                        u++;
                        break;

                    /* Random # seed */
                    case 'r':
                        use_seed = true;
                        temp     = atoi(argv[u + 1]);
                        if (temp < 0)
                            usage();
                        else
                            random_seed = (unsigned)temp;
                        u += 2;
                        break;

                    default:
                        usage();
                        break;
                } /* end switch */
            }     /* end if */
            else {
                /* Get the number of records to append */
                nrecords = atol(argv[u]);
                if (nrecords <= 0)
                    usage();

                u++;
            } /* end else */
        }     /* end while */
    }         /* end if */

    if (nrecords <= 0)
        usage();
    if (flush_count >= nrecords)
        usage();

    /* Set the random seed */
    if (!use_seed) {
        struct timeval t;

        HDgettimeofday(&t, NULL);
        random_seed = (unsigned)(t.tv_usec);
    } /* end if */
    HDsrandom(random_seed);

    /* Open output file */
    if (verbose) {
        char verbose_name[1024];

        snprintf(verbose_name, sizeof(verbose_name), "swmr_writer.out.%u", random_seed);
        if (NULL == (verbose_file = fopen(verbose_name, "w"))) {
            fprintf(stderr, "Can't open verbose output file!\n");
            exit(EXIT_FAILURE);
        }
    } /* end if */

    /* Emit informational message */
    if (verbose) {
        fprintf(verbose_file, "Parameters:\n");
        fprintf(verbose_file, "\tindex type = %s\n", index_type);
        fprintf(verbose_file, "\tcompression level = %d\n", comp_level);
        fprintf(verbose_file, "\t# of records between flushes = %ld\n", flush_count);
        fprintf(verbose_file, "\t# of records to write = %ld\n", nrecords);
    } /* end if */

    /* ALWAYS emit the random seed for possible debugging */
    fprintf(stdout, "Using writer random seed: %u\n", random_seed);

    /* Create the test file */
    if ((fid = create_file(FILENAME, verbose, verbose_file, random_seed)) < 0) {
        fprintf(stderr, "Error creating the file...\n");
        exit(EXIT_FAILURE);
    }

    /* Emit informational message */
    if (verbose)
        fprintf(verbose_file, "Generating symbol names\n");

    /* Generate dataset names */
    if (generate_symbols() < 0)
        return -1;

    /* Create the datasets in the file */
    if (create_datasets(fid, comp_level, verbose, verbose_file, index_type) < 0) {
        fprintf(stderr, "Error creating datasets...\n");
        exit(EXIT_FAILURE);
    }

    /* Enable SWMR writing mode */
    if (H5Fstart_swmr_write(fid) < 0) {
        fprintf(stderr, "Error starting SWMR writing mode...\n");
        exit(EXIT_FAILURE);
    }

    /* Send a message to indicate "H5Fopen" is complete--releasing the file lock */
    h5_send_message(WRITER_MESSAGE, NULL, NULL);

    /* Emit informational message */
    if (verbose)
        fprintf(verbose_file, "Adding records\n");

    /* Append records to datasets */
    if (add_records(fid, verbose, verbose_file, (unsigned long)nrecords, (unsigned long)flush_count) < 0) {
        fprintf(stderr, "Error appending records to datasets!\n");
        exit(EXIT_FAILURE);
    } /* end if */

    /* Emit informational message */
    if (verbose)
        fprintf(verbose_file, "Releasing symbols\n");

    /* Clean up the symbols */
    if (shutdown_symbols() < 0) {
        fprintf(stderr, "Error releasing symbols!\n");
        exit(EXIT_FAILURE);
    } /* end if */

    /* Emit informational message */
    if (verbose)
        fprintf(verbose_file, "Closing the file\n");

    /* Close objects opened */
    if (H5Fclose(fid) < 0) {
        fprintf(stderr, "Error closing file!\n");
        exit(EXIT_FAILURE);
    } /* end if */

    return 0;
} /* main() */