hdf5/test/mtime.c
Quincey Koziol 9a433b99a5 [svn-r6252] Purpose:
Lots of performance improvements & a couple new internal API interfaces.

Description:
    Performance Improvements:
        - Cached file offset & length sizes in shared file struct, to avoid
            constantly looking them up in the FCPL.
        - Generic property improvements:
            - Added "revision" number to generic property classes to speed
                up comparisons.
            - Changed method of storing properties from using a hash-table
                to the TBBT routines in the library.
            - Share the propery names between classes and the lists derived
                from them.
            - Removed redundant 'def_value' buffer from each property.
            - Switching code to use a "copy on write" strategy for
                properties in each list, where the properties in each list
                are shared with the properties in the class, until a
                property's value is changed in a list.
        - Fixed error in layout code which was allocating too many buffers.
        - Redefined public macros of the form (H5open()/H5check, <variable>)
            internally to only be (<variable>), avoiding innumerable useless
            calls to H5open() and H5check_version().
        - Reuse already zeroed buffers in H5F_contig_fill instead of
            constantly re-zeroing them.
        - Don't write fill values if writing entire dataset.
        - Use gettimeofday() system call instead of time() system when
            checking the modification time of a dataset.
        - Added reference counted string API and use it for tracking the
            names of objects opening in a file (for the ID->name code).
        - Removed redundant H5P_get() calls in B-tree routines.
        - Redefine H5T datatype macros internally to the library, to avoid
            calling H5check redundantly.
        - Keep dataspace information for dataset locally instead of reading
            from disk each time.  Added new module to track open objects
            in a file, to allow this (which will be useful eventually for
            some FPH5 metadata caching issues).
        - Remove H5AC_find macro which was inlining metadata cache lookups,
            and call function instead.
        - Remove redundant memset() calls from H5G_namei() routine.
        - Remove redundant checking of object type when locating objects
            in metadata cache and rely on the address only.
        - Create default dataset object to use when default dataset creation
            property list is used to create datasets, bypassing querying
            for all the property list values.
        - Use default I/O vector size when performing raw data with the
            default dataset transfer property list, instead of querying for
            I/O vector size.
        - Remove H5P_DEFAULT internally to the library, replacing it with
            more specific default property list based on the type of
            property list needed.
        - Remove redundant memset() calls in object header message (H5O*)
            routines.
        - Remove redunant memset() calls in data I/O routines.
        - Split free-list allocation routines into malloc() and calloc()-
            like routines, instead of one combined routine.
        - Remove lots of indirection in H5O*() routines.
        - Simplify metadata cache entry comparison routine (used when
            flushing entire cache out).
        - Only enable metadata cache statistics when H5AC_DEBUG is turned
            on, instead of always tracking them.
        - Simplify address comparison macro (H5F_addr_eq).
        - Remove redundant metadata cache entry protections during dataset
            creation by protecting the object header once and making all
            the modifications necessary for the dataset creation before
            unprotecting it.
        - Reduce # of "number of element in extent" computations performed
            by computing and storing the value during dataspace creation.
        - Simplify checking for group location's file information, when file
            has not been involving in file-mounting operations.
        - Use binary encoding for modification time, instead of ASCII.
        - Hoist H5HL_peek calls (to get information in a local heap)
            out of loops in many group routine.
        - Use static variable for iterators of selections, instead of
            dynamically allocation them each time.
        - Lookup & insert new entries in one step, avoiding traversing
            group's B-tree twice.
        - Fixed memory leak in H5Gget_objname_idx() routine (tangential to
            performance improvements, but fixed along the way).
        - Use free-list for reference counted strings.
        - Don't bother copying object names into cached group entries,
            since they are re-created when an object is opened.

        The benchmark I used to measure these results created several thousand
        small (2K) datasets in a file and wrote out the data for them.  This is
        Elena's "regular.c" benchmark.

        These changes resulted in approximately ~4.3x speedup of the
        development branch when compared to the previous code in the
        development branch and ~1.4x speedup compared to the release
        branch.

        Additionally, these changes reduce the total memory used (code and
        data) by the development branch by ~800KB, bringing the development
        branch back into the same ballpark as the release branch.

        I'll send out a more detailed description of the benchmark results
        as a followup note.

    New internal API routines:
        Added "reference counted strings" API for tracking strings that get
            used by multiple owners without duplicating the strings.
        Added "ternary search tree" API for text->object mappings.

Platforms tested:
    Tested h5committest {arabica (fortran), eirene (fortran, C++)
	modi4 (parallel, fortran)}
    Other platforms/configurations tested?
        FreeBSD 4.7 (sleipnir) serial & parallel
        Solaris 2.6 (baldric) serial
2003-01-09 12:20:03 -05:00

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/*
* Copyright © 1998 NCSA
* All rights reserved.
*
* Programmer: Robb Matzke <matzke@llnl.gov>
* Thursday, July 30, 1998
*
* Purpose: Determines if the modification time message is working
* properly. Specifically, the code in H5O_mtime_decode() is
* very OS-dependent and this test tries to figure out if it's
* working properly.
*/
#include "h5test.h"
const char *FILENAME[] = {
"mtime",
NULL
};
#define TESTFILE1 "tmtimeo.h5"
#define MTIME1 1041605080
#define TESTFILE2 "tmtimen.h5"
#define MTIME2 1041606478
/*-------------------------------------------------------------------------
* Function: main
*
* Purpose: H5O_mtime_decode() test.
*
* Return: Success:
*
* Failure:
*
* Programmer: Robb Matzke
* Thursday, July 30, 1998
*
* Modifications:
* Added checks for old and new modification time messages
* in pre-created datafiles (generated with gen_old_mtime.c and
* gen_new_mtime.c).
* Quincey Koziol
* Friday, January 3, 2003
*
*-------------------------------------------------------------------------
*/
int
main(void)
{
hid_t fapl, file, space, dset;
hsize_t size[1] = {2};
time_t now;
struct tm *tm;
H5G_stat_t sb1, sb2;
signed char buf1[32], buf2[32];
char filename[1024];
h5_reset();
fapl = h5_fileaccess();
TESTING("modification time messages");
/* Create the file, create a dataset, then close the file */
h5_fixname(FILENAME[0], fapl, filename, sizeof filename);
if ((file=H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, fapl))<0)
return 1;
if ((space=H5Screate_simple(1, size, NULL))<0) return 1;
if ((dset=H5Dcreate(file, "dset", H5T_NATIVE_SCHAR, space, H5P_DEFAULT))<0)
return 1;
now = time(NULL);
if (H5Dclose(dset)<0) return 1;
if (H5Sclose(space)<0) return 1;
if (H5Fclose(file)<0) return 1;
/*
* Open the file and get the modification time. We'll test the new
* H5Gget_objinfo() arguments too: being able to stat something without
* knowing its name.
*/
h5_fixname(FILENAME[0], fapl, filename, sizeof filename);
if ((file = H5Fopen(filename, H5F_ACC_RDONLY, fapl))<0) return 1;
if (H5Gget_objinfo(file, "dset", TRUE, &sb1)<0) return 1;
if ((dset=H5Dopen(file, "dset"))<0) return 1;
if (H5Gget_objinfo(dset, ".", TRUE, &sb2)<0) return 1;
if (H5Dclose(dset)<0) return 1;
if (H5Fclose(file)<0) return 1;
/* Compare times from the two ways of calling H5Gget_objinfo() */
if (sb1.objno[0]!=sb2.objno[0] || sb1.objno[1]!=sb2.objno[1] ||
sb1.mtime!=sb2.mtime) {
H5_FAILED();
puts(" Calling H5Gget_objinfo() with the dataset ID returned");
puts(" different values than calling it with a file and dataset");
puts(" name.");
return 1;
}
/* Compare times -- they must be within 60 seconds of one another */
if (0==sb1.mtime) {
SKIPPED();
puts(" The modification time could not be decoded on this OS.");
puts(" Modification times will be mantained in the file but");
puts(" cannot be queried on this system. See H5O_mtime_decode().");
return 0;
} else if (fabs(HDdifftime(now, sb1.mtime))>60.0) {
H5_FAILED();
tm = localtime(&(sb1.mtime));
strftime((char*)buf1, sizeof buf1, "%Y-%m-%d %H:%M:%S", tm);
tm = localtime(&now);
strftime((char*)buf2, sizeof buf2, "%Y-%m-%d %H:%M:%S", tm);
printf(" got: %s\n ans: %s\n", buf1, buf2);
return 1;
}
PASSED();
/* Check opening existing file with old-style modification time information
* and make certain that the time is correct
*/
TESTING("accessing old modification time messages");
{
char testfile[512]="";
char *srcdir = HDgetenv("srcdir");
if (srcdir && ((HDstrlen(srcdir) + strlen(TESTFILE1) + 1) < sizeof(testfile))){
HDstrcpy(testfile, srcdir);
HDstrcat(testfile, "/");
}
HDstrcat(testfile, TESTFILE1);
file = H5Fopen(testfile, H5F_ACC_RDONLY, H5P_DEFAULT);
if (file >= 0){
if(H5Gget_objinfo(file, "/Dataset1", TRUE, &sb1)<0)
return 1;
if(sb1.mtime!=MTIME1) return 1;
if (H5Fclose(file)<0) return 1;
}
else {
printf("***cannot open the pre-created old modification test file (%s)\n",
testfile);
return 1;
} /* end else */
}
PASSED();
/* Check opening existing file with new-style modification time information
* and make certain that the time is correct
*/
TESTING("accessing new modification time messages");
{
char testfile[512]="";
char *srcdir = HDgetenv("srcdir");
if (srcdir && ((HDstrlen(srcdir) + strlen(TESTFILE2) + 1) < sizeof(testfile))){
HDstrcpy(testfile, srcdir);
HDstrcat(testfile, "/");
}
HDstrcat(testfile, TESTFILE2);
file = H5Fopen(testfile, H5F_ACC_RDONLY, H5P_DEFAULT);
if (file >= 0){
if(H5Gget_objinfo(file, "/Dataset1", TRUE, &sb2)<0)
return 1;
if(sb2.mtime!=MTIME2) return 1;
if (H5Fclose(file)<0) return 1;
}
else {
printf("***cannot open the pre-created old modification test file (%s)\n",
testfile);
return 1;
} /* end else */
}
PASSED();
/* All looks good */
puts("All modification time tests passed.");
h5_cleanup(FILENAME, fapl);
return 0;
}