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hdf5_1_16
hdf5/test/swmr_sparse_writer.c
Dana Robinson a99d620172
Clean up random number generator code (#4338) 
* Clean up random number generator code

Depending on the platform, we use a mix of random, rand, and rand_r
to generate pseudo-random numbers, along with a messy set of ifdefs
in H5private.h. We are not a cryptographic library, only use random
numbers in our test code, and have no need for anything more than the
C standard's (s)rand(). There's no point dithering about using rand()
vs random() when we're also doing bad things like using mod to
restrict the range, which introduces bias.

Also removes CMake/configure checks for rand_r and random

* Remove random/rand_r checks from build system

* Fix missed HDrandom after GitHub merge
2024-04-07 15:15:25 -07:00

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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* 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_sparse_writer.c
*
* Purpose: Writes data to a randomly selected subset of the datasets
* in the SWMR test file.
*
* This program is intended to run concurrently with the
* swmr_sparse_reader program.
*
*-------------------------------------------------------------------------
*/
/***********/
/* Headers */
/***********/
#include "h5test.h"
#include "swmr_common.h"
/****************/
/* Local Macros */
/****************/
#ifdef OUT
#define BUSY_WAIT 100000
#endif /* OUT */
/********************/
/* Local Prototypes */
/********************/
static hid_t open_skeleton(const char *filename, unsigned verbose);
static int add_records(hid_t fid, unsigned verbose, unsigned long nrecords, unsigned long flush_count);
static void usage(void);
/*-------------------------------------------------------------------------
* Function: open_skeleton
*
* Purpose: Opens the SWMR HDF5 file and datasets.
*
* Parameters: const char *filename
* The filename of the SWMR HDF5 file to open
*
* unsigned verbose
* Whether or not to emit verbose console messages
*
* Return: Success: The file ID of the opened SWMR file
* The dataset IDs are stored in a global array
*
* Failure: -1
*
*-------------------------------------------------------------------------
*/
static hid_t
open_skeleton(const char *filename, unsigned verbose)
{
hid_t fid; /* File ID for new HDF5 file */
hid_t fapl; /* File access property list */
hid_t aid; /* Attribute ID */
unsigned seed; /* Seed for random number generator */
unsigned u, v; /* Local index variable */
assert(filename);
/* Create file access property list */
if ((fapl = h5_fileaccess()) < 0)
return -1;
/* Set to use the latest library format */
if (H5Pset_libver_bounds(fapl, H5F_LIBVER_LATEST, H5F_LIBVER_LATEST) < 0)
return -1;
/* Open the file */
if ((fid = H5Fopen(filename, H5F_ACC_RDWR | H5F_ACC_SWMR_WRITE, fapl)) < 0)
return -1;
/* Close file access property list */
if (H5Pclose(fapl) < 0)
return -1;
/* Emit informational message */
if (verbose)
fprintf(stderr, "Opening datasets\n");
/* Seed the random number generator with the attribute in the file */
if ((aid = H5Aopen(fid, "seed", H5P_DEFAULT)) < 0)
return -1;
if (H5Aread(aid, H5T_NATIVE_UINT, &seed) < 0)
return -1;
if (H5Aclose(aid) < 0)
return -1;
srand(seed);
/* Open the datasets */
for (u = 0; u < NLEVELS; u++)
for (v = 0; v < symbol_count[u]; v++) {
if ((symbol_info[u][v].dsid = H5Dopen2(fid, symbol_info[u][v].name, H5P_DEFAULT)) < 0)
return (-1);
symbol_info[u][v].nrecords = 0;
} /* end for */
return fid;
}
/*-------------------------------------------------------------------------
* Function: add_records
*
* Purpose: Writes a specified number of records to random datasets in
* the SWMR test file.
*
* Parameters: hid_t fid
* The file ID of the SWMR HDF5 file
*
* unsigned verbose
* Whether or not to emit verbose console messages
*
* unsigned long nrecords
* # of records to write to the datasets
*
* unsigned long flush_count
* # of records to write before flushing the file to disk
*
* Return: Success: 0
* Failure: -1
*
*-------------------------------------------------------------------------
*/
static int
add_records(hid_t fid, unsigned verbose, 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}; /* Hyperslab selection values */
hsize_t count[2] = {1, 1}; /* Hyperslab selection values */
symbol_t record; /* The record to add to the dataset */
unsigned long rec_to_flush; /* # of records left to write before flush */
#ifdef OUT
volatile int dummy; /* Dummy variable for busy sleep */
#endif /* OUT */
hsize_t dim[2] = {1, 0}; /* Dataspace dimensions */
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 */
hid_t aid; /* Attribute ID */
bool corked; /* Whether the dataset was corked */
/* Get a random dataset, according to the symbol distribution */
symbol = choose_dataset();
/* If this is the first time the dataset has been opened, extend it and
* add the sequence attribute */
if (symbol->nrecords == 0) {
symbol->nrecords = nrecords / 5;
dim[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;
corked = true;
if (H5Dset_extent(symbol->dsid, dim) < 0)
return -1;
if ((file_sid = H5Screate(H5S_SCALAR)) < 0)
return -1;
if ((aid = H5Acreate2(symbol->dsid, "seq", H5T_NATIVE_ULONG, file_sid, H5P_DEFAULT,
H5P_DEFAULT)) < 0)
return -1;
if (H5Sclose(file_sid) < 0)
return -1;
} /* end if */
else {
if ((aid = H5Aopen(symbol->dsid, "seq", H5P_DEFAULT)) < 0)
return -1;
corked = false;
} /* end else */
/* Get the coordinate to write */
start[1] = (hsize_t)rand() % symbol->nrecords;
/* Set the record's ID (equal to its position) */
record.rec_id = start[1];
/* Get the dataset's dataspace */
if ((file_sid = H5Dget_space(symbol->dsid)) < 0)
return -1;
/* Choose a random 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;
/* Write the sequence number attribute. Since we synchronize the random
* number seed, the readers will always generate the same sequence of
* randomly chosen datasets and offsets. Therefore, and because of the
* flush dependencies on the object header, the reader will be
* guaranteed to see the written data if the sequence attribute is >=u.
*/
if (H5Awrite(aid, H5T_NATIVE_ULONG, &u) < 0)
return -1;
/* Close the attribute */
if (H5Aclose(aid) < 0)
return -1;
/* Uncork the metadata cache, if it's been */
if (corked)
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 */
#ifdef OUT
/* Busy wait, to let readers catch up */
/* If this is removed, also remove the BUSY_WAIT symbol
* at the top of the file.
*/
dummy = 0;
for (v = 0; v < BUSY_WAIT; v++)
dummy++;
if ((unsigned long)dummy != v)
return -1;
#endif /* OUT */
} /* 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(stderr, "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;
}
static void
usage(void)
{
printf("\n");
printf("Usage error!\n");
printf("\n");
printf("Usage: swmr_sparse_writer [-q] [-f <# of records to write between\n");
printf(" flushing file contents>] <# 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("Defaults to verbose (no '-q' given) and flushing every 1000 records\n");
printf("('-f 1000')\n");
printf("\n");
exit(EXIT_FAILURE);
}
int
main(int argc, char *argv[])
{
hid_t fid; /* File ID for file opened */
long nrecords = 0; /* # of records to append */
long flush_count = 1000; /* # of records to write between flushing file */
unsigned verbose = 1; /* Whether to emit some informational messages */
unsigned u; /* Local index 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]) {
/* # 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 = 0;
u++;
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();
/* Emit informational message */
if (verbose) {
fprintf(stderr, "Parameters:\n");
fprintf(stderr, "\t# of records between flushes = %ld\n", flush_count);
fprintf(stderr, "\t# of records to write = %ld\n", nrecords);
} /* end if */
/* Emit informational message */
if (verbose)
fprintf(stderr, "Generating symbol names\n");
/* Generate dataset names */
if (generate_symbols() < 0)
return -1;
/* Emit informational message */
if (verbose)
fprintf(stderr, "Opening skeleton file: %s\n", FILENAME);
/* Open file skeleton */
if ((fid = open_skeleton(FILENAME, verbose)) < 0) {
fprintf(stderr, "Error opening skeleton file!\n");
exit(EXIT_FAILURE);
} /* end if */
/* 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(stderr, "Adding records\n");
/* Append records to datasets */
if (add_records(fid, verbose, (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(stderr, "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(stderr, "Closing objects\n");
/* Close objects opened */
if (H5Fclose(fid) < 0) {
fprintf(stderr, "Error closing file!\n");
exit(EXIT_FAILURE);
} /* end if */
return 0;
}
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