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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. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* This example demonstrates debug trace output.
*
* Debug/trace/performance output is not tested as a regular part of our
* testing so this program gives a quick check that it's all working.
*
* Preconditions:
*
* You need to set an environment variable named HDF5_DEBUG to have a value
* of "+all trace ttimes". In the bash shell, you'd use:
*
* export HDF5_DEBUG="+all trace ttimes"
*
* When you are done with this test program, you can set the variable back
* to "-all" to suppress trace output.
*
* Usage:
*
* Compile and run the test program, then inspect the output. You should see
* trace information for each HDF5 function call that increase over time.
* Each time stamp is in seconds and designated with an '@' sign. The
* elapsed time for the function call is given in seconds in the [dt= ]
* part.
*
* You will also get summary output for the shuffle filter performance and
* data type conversion performance. These will include the elapsed time
* (always) and the system and user times (if available on your system). On
* fast machines, these numbers may be 0.0. Adjust the loop variables in
* the program as needed to generate reasonable output.
*/
#include <stdio.h>
#include <stdlib.h>
#include "hdf5.h"
#define BUF_SIZE 1048576
#define N_LOOPS 64
#define TESTFILE "h5_debug_trace_out.h5"
int
main(int argc, char **argv)
{
int i, j;
int *data;
hid_t fid;
hid_t pid;
hid_t did;
hid_t sid;
hsize_t dims[1] = {BUF_SIZE};
hsize_t chunk_sizes[1] = {1024};
herr_t err;
/*************************************************************************/
/* Warn the user about trace deluge to come */
printf("Testing debug/trace/performance data generation\n");
printf("\n");
printf("This test should generate a large amount of trace data\n");
printf("\n");
printf("*** BEGIN TRACE OUTPUT ***\n");
printf("\n");
fflush(stdout);
/* This will emit H5Tconvert() performance information */
for (i = 0; i < N_LOOPS; i++) {
/* The buffer has to be large enough to hold the conversion output */
data = (int *)malloc(BUF_SIZE * sizeof(double));
for (j = 0; j < BUF_SIZE; j++) {
data[j] = j;
}
err = H5Tconvert(H5T_NATIVE_INT, H5T_NATIVE_DOUBLE, BUF_SIZE, data, NULL, H5P_DEFAULT);
if (err < 0) {
fprintf(stderr, "ERROR: Conversion failed\n");
free(data);
return err;
}
free(data);
}
/* This will emit H5Z performance information */
data = (int *)malloc(BUF_SIZE * sizeof(int));
for (i = 0; i < BUF_SIZE; i++) {
data[i] = i;
}
fid = H5Fcreate(TESTFILE, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
pid = H5Pcreate(H5P_DATASET_CREATE);
err = H5Pset_chunk(pid, 1, chunk_sizes);
err = H5Pset_shuffle(pid);
sid = H5Screate_simple(1, dims, dims);
did = H5Dcreate2(fid, "somedata", H5T_NATIVE_INT, sid, H5P_DEFAULT, pid, H5P_DEFAULT);
err = H5Dwrite(did, H5T_NATIVE_INT, sid, sid, H5P_DEFAULT, data);
H5Sclose(sid);
H5Dclose(did);
H5Pclose(pid);
H5Fclose(fid);
free(data);
/* Finished */
fflush(stdout);
printf("\n");
printf("*** END TRACE OUTPUT ***\n");
printf("\n");
remove(TESTFILE);
return 0;
}
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