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* Combine "collective group and dataset write" and "independent group andLarry Knox2019-05-031-0/+1
| | | | | dataset read" tests into one test. The second test is dependent on the file created by the first test, and will not pass when run by itself.
* Fix some collective metadata read issuesJordan Henderson2019-02-121-0/+2
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* Add fix for HDFFV-10501Jordan Henderson2018-08-261-0/+1
| | | | | Add test for HDFFV-10501 fix Add release note for HDFFV-10501 fix
* Merge pull request #426 in HDFFV/hdf5 from ~LRKNOX/hdf5_lrk:hdf5_1_10 to ↵Larry Knox2017-04-251-6/+4
| | | | | | | | | | hdf5_1_10 * commit '54957d37f5aa73912763dbb6e308555e863c43f4': Commit copyright header change for src/H5PLpkg.c which was added after running script to make changes. Add new files in release_docs to MANIFEST. Cimmit changes to Makefile.in(s) and H5PL.c that resulted from running autogen.sh. Merge pull request #407 in HDFFV/hdf5 from ~LRKNOX/hdf5_lrk:hdf5_1_10_1 to hdf5_1_10_1 Change copyright headers to replace url referring to file to be removed and replace it with new url for COPYING file.
* Final merge of page buffering branch to developQuincey Koziol2017-03-141-0/+1
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* [svn-r30270] Fix an issue that could occur when allocating a chunked dataset ↵Neil Fortner2016-08-081-0/+1
| | | | | | | | | in parallel, with an alignment threshold set to be larger than the chunk size but smaller than the size of the small data aggregator. Tested: koala, ostrich (h5committest); jelly, ummon
* [svn-r29088] - Add a test for retrieving the property values for the new ↵Mohamad Chaarawi2016-02-111-0/+1
| | | | | | | | | coll md functions. - ifdef some code that don't need to be built in parallel - more minor enhancements tested on bb-8 with parallel and serial
* [svn-r26271] Reverse merge of r26260 which was causing daily test failures.Dana Robinson2015-02-221-1/+0
| | | | Tested on: jam w/ parallel and fortran
* [svn-r26260] - add an attribute callback to call H5_term_library when ↵Mohamad Chaarawi2015-02-201-0/+1
| | | | | | | | | MPI_COMM_SELF is destroyed. - add tests for above. - this is a fix for HDFFV-883. tested h5committest
* [svn-r25401] add serial and parallel regression tests for zero dset ↵Mohamad Chaarawi2014-07-091-0/+1
| | | | read/write bug.
* [svn-r24864] Description:Quincey Koziol2014-03-211-10/+6
| | | | | | | | | | | | | | | | | | Remove all traces of MPI-POSIX VFD and GPFS detection/code. Remove remaining traces of stream VFD. Remove testpar/t_posix_compliant test (it's not actually verifying anything). Clean up H5D__mpio_opt_possible() further. Moved environment variable that disables MPI collective operations into MPI-IO VFD (instead of it being in src/H5S.c). A few other small code cleanups. Tested on: Mac OSX/64 10.9.2 (amazon) w/parallel & serial
* [svn-r24769] Description:Quincey Koziol2014-03-071-6/+13
| | | | | | | | | Check in Mohamad's changes to support collective I/O on point selections, along with some other minor cleanups. Tested on: Mac OSX/64 10.9.2 (amazon) w/parallel & serial (h5committest forthcoming)
* [svn-r23529] Description:Quincey Koziol2013-04-031-0/+1
| | | | | | | | Stop aliasing property to indicate internal collective metadata operations with property to perform collective raw data operations from the application. Tested on: Mac OSX/64 10.8.3 (amazon) w/paralllel
* [svn-r22992] Purpose:Jonathan Kim2012-10-301-5/+4
| | | | | | | | | | | HDFFV-8146 - Remove "multi-chunk IO without optimization" sub-feature from MPI I/O optimization for chunked dataset feature Description: The “multi-chunk IO without optimization” feature is removed and made the related xfer property (H5FD_MPIO_CHUNK_MULTI_IO) go directly to “multi-chunk-io” feature. Also update/fix/cleanup testings (chunk collective IO and actual chunk opt mode) accordingly. Tested: jam (linux32-LE), koala (linux64-LE), ostrich (linuxppc64-BE), fred (mac64-LE), Windows (32-LE cmake), cmake (jam)
* [svn-r22807] Description:Quincey Koziol2012-09-251-0/+1
| | | | | | | | | | | | | | | | | | | | | Add encode/decode API routines for property lists: H5Pencode/H5Pdecode. Tested on: FreeBSD/32 8.2 (loyalty) w/gcc4.6, w/C++ & FORTRAN, in debug mode FreeBSD/64 8.2 (freedom) w/gcc4.6, w/C++ & FORTRAN, in debug mode Linux/32 2.6 (jam) w/PGI compilers, w/default API=1.8.x, w/C++ & FORTRAN, w/threadsafe, in debug mode Linux/64-amd64 2.6 (koala) w/Intel compilers, w/default API=1.6.x, w/C++ & FORTRAN, in production mode Solaris/32 2.10 (linew) w/deprecated symbols disabled, w/C++ & FORTRAN, w/szip filter, w/threadsafe, in production mode Linux/PPC 2.6 (ostrich) w/C++ & FORTRAN, w/threadsafe, in debug mode Linux/64-ia64 2.6 (ember) w/Intel compilers, w/parallel, C++ & FORTRAN, in production mode Mac OS X/32 10.7.3 (amazon) in debug mode Mac OS X/32 10.7.3 (amazon) w/C++ & FORTRAN, w/threadsafe, in production mode Mac OS X/32 10.7.3 (amazon) w/parallel, in debug mode
* [svn-r22735] Purpose:Jonathan Kim2012-09-041-0/+16
| | | | | | | | | | | | | | | | | | | HDFFV-8143 Provide a routine(s) for telling the user why the library broke collective data access Description: Added H5Pget_mpio_no_collective_cause() function that retrive reasons why the collective I/O was broken during Read/Write IO access. Reasons to break collective I/O: - SET_INDEPENDENT - DATATYPE_CONVERSION - DATA_TRANSFORMS - MPIPOSIX - NOT_SIMPLE_OR_SCALAR_DATASPACES (NULL Space) - POINT_SELECTIONS - NOT_CONTIGUOUS_OR_CHUNKED_DATASET (Compact or External-Storage) - FILTERS Tested: jam (linux32-LE), koala (linux64-LE), ostrich (linuxppc64-BE), tejeda (mac32-LE), linew (solaris-BE)
* [svn-r22219] Description:Quincey Koziol2012-03-311-0/+1
| | | | | | | | Merge "file image" changes from feature branch back to trunk. Tested on: Mac OSX/64 10.7.3 (amazon) w/debug (h5committest upcoming)
* [svn-r22115] Add 2 new API routines to set/unset file atomicity for files ↵Mohamad Chaarawi2012-03-211-0/+3
| | | | | | | opened with the MPI-IO VFD Add test cases for these two routines Jira issue HDFFV-7961
* [svn-r21442] Description:Quincey Koziol2011-10-011-1/+15
| | | | | | | | | | | | | | | | | | | | | | Check in "actual I/O mode" feature to trunk. Will merge back to 1.8 branch after it bakes over the weekend. Tested on: FreeBSD/32 8.2 (loyalty) w/gcc4.6, w/C++ & FORTRAN, in debug mode FreeBSD/64 8.2 (freedom) w/gcc4.6, w/C++ & FORTRAN, in debug mode Linux/32 2.6 (jam) w/PGI compilers, w/default API=1.8.x, w/C++ & FORTRAN, w/threadsafe, in debug mode Linux/64-amd64 2.6 (koala) w/Intel compilers, w/default API=1.6.x, w/C++ & FORTRAN, in production mode Solaris/32 2.10 (linew) w/deprecated symbols disabled, w/C++ & FORTRAN, w/szip filter, w/threadsafe, in production mode Linux/PPC 2.6 (heiwa) w/C++ & FORTRAN, w/threadsafe, in debug mode Linux/64-ia64 2.6 (ember) w/Intel compilers, w/C++ & FORTRAN, in production mode Linux/64-amd64 2.6 (abe) w/parallel, w/FORTRAN, in debug mode Mac OS X/32 10.6.8 (amazon) in debug mode Mac OS X/32 10.6.8 (amazon) w/C++ & FORTRAN, w/threadsafe, in production mode
* [svn-r19961] Purpose:Albert Cheng2011-01-161-2/+10
| | | | | | | | | | | | The shape same tests ran too long. Break them into smaller subtests so that they can finish sub-test in a shorter time. Easier to tell which one sub-test is taking too much time and/or errors occur in one fo the sub-tests. This one breaks the contig_hyperslab_dr_pio_test() into 4 smaller sub-tests. Tested: h5committest
* [svn-r19682] Bug 2054: Round Robin code caused H5FFlush to corrupt a file.Albert Cheng2010-10-281-0/+2
| | | | | | | | | John Mainzer fixed the bug and added a test which wrote file and flush a few time; close the file then open it by serial and read simple structure. I changed the test to two parallel running parts of ..._writer and ..._reader and have the reader verify the file after every flush by the writer. Tested: parallel in Jam and Amani.
* [svn-r19622] Port of fix for the round robin parallel flush bug caused by ↵John Mainzer2010-10-171-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | the failure of the H5Ocache.c code to update its image of the on disk representation of the object header on a call to the clear callback. This wasn't an issue as long as all flushes of the object header were made from the same process, but if an object header is modified, and then flushed on one process and cleared on the rest, the changes were not be reflected in the images of the on disk representation on all processes where the object header was cleared rather than flushed. If one of these processes did the next flush, the changes were lost in the on disk representation. Fixed this by causing all dirty messages and to be written to the copy of the on disk image maintained by the object header code on both flush and clear. Also added associated test code in t_mdset.c. Also checking in some cache debug code developed while chasing this bug. Commit tested and tested (parallel) on phoenix.
* [svn-r19092] Description:Quincey Koziol2010-07-191-0/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | Bring "shape same" changes from LBL branch to trunk. These changes allow shapes that are the same, but projected into dataspaces with different ranks to be detected correctly, and also contains code to project a dataspace into greater/lesser number of dimensions, so the I/O can proceed in a faster way. These changes also contain several bug fixes and _lots_ of code cleanups to the MPI datatype creation code. Many other misc. code cleanup are included as well... Tested on: FreeBSD/32 6.3 (duty) in debug mode FreeBSD/64 6.3 (liberty) w/C++ & FORTRAN, in debug mode Linux/32 2.6 (jam) w/PGI compilers, w/default API=1.8.x, w/C++ & FORTRAN, w/threadsafe, in debug mode Linux/64-amd64 2.6 (amani) w/Intel compilers, w/default API=1.6.x, w/C++ & FORTRAN, in production mode Solaris/32 2.10 (linew) w/deprecated symbols disabled, w/C++ & FORTRAN, w/szip filter, in production mode Linux/64-ia64 2.6 (cobalt) w/Intel compilers, w/C++ & FORTRAN, in production mode Linux/64-amd64 2.6 (abe) w/parallel, w/FORTRAN, in debug mode Mac OS X/32 10.6.3 (amazon) in debug mode Mac OS X/32 10.6.3 (amazon) w/C++ & FORTRAN, w/threadsafe, in production mode
* [svn-r16723] Modified dset and t_chunk_alloc tests to use dataset dimensions ↵Christian Chilan2009-04-091-5/+2
| | | | | | that are multiples of the number of processors. Tested on jam and abe.
* [svn-r16659] Modified dset and t_chunk_alloc tests to use dataset dimensions ↵Christian Chilan2009-04-021-0/+5
| | | | | | that are multiples of the number of processors. Tested on jam and abe.
* [svn-r14098] Description:Quincey Koziol2007-08-211-1/+1
| | | | | | | | Clean up a few remaining API compatibility issues in the H5E API for parallel configurations Tested on: FreeBSD/64 6.2 (liberty) w/parallel
* [svn-r14096] There're 3 changes in this checkin as below:Raymond Lu2007-08-201-0/+1
| | | | | | | | | | | | | | | | | | 1. In H5Dwrite and H5Dread, let the data buffer point to a fake address if the application passes in an empty buffer. This is mainly for MPIO programs that some processes may not have any data to write or read but still participate the I/O. This solution solves some MPI's problem like the ChaMPIon on tungsten which doesn't support empty buffer. 2. The ChaMPIon on tungsten doesn't support complex derived MPI data type correctly and collective I/O when some processes don't have any data to write or read correctly. Detect the compiler "cmpicc" in the system-specific config file and set the variables for these two cases to false. The PHDF5 library already has set up a way to switch collective chunked I/O to independent under these two cases. 3. A bug fix - During the work of the optimization for compound data I/O, the case for switching collective chunked I/O to independent I/O was leftout. Fixed it by adding I/O caching to it in H5D_multi_chunk_collective_io in H5Dmpio.c. Tested on tungsten, cobalt, and kagiso for parallel; on linew and smirom for serial.
* [svn-r13779] Add test_filter_read to testphdf5.Christian Chilan2007-05-221-0/+1
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* [svn-r13253] Updated all C and C++ style source code files with the THG ↵Albert Cheng2007-02-071-2/+3
| | | | | | | | | copyright notice. Tested platform: Kagiso only since it is only a comment block change. If it works in one machine, it should work in all, I hope. Still need to check the parallel build on copper.
* [svn-r12554] New tests have been added to test the correctness of ↵MuQun Yang2006-08-091-0/+3
| | | | | | | | independent IO with file setview. To activite this test, add the command option -i. For example, at IBM AIX, type "poe testphdf5 -i" will test the library with independent IO with file setview. It simply replaces all the collective IO tests with independent IO with file setview.
* [svn-r12174] Purpose:MuQun Yang2006-03-291-1/+24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Adding parallel tests for optional collective chunk APIs Description: Three new APIs "H5Pset_dxpl_mpio_chunk_opt_ratio H5Pset_dxpl_mpio_chunk_opt_num H5Pset_dxpl_mpio_chunk_opt" for optional optimization choices from users have been added to the libraries. This check-in adds six tests to verify the funcationality and correctedness of these APIs. These tests need to be verified with 3 or more processors and with MPI-IO driver only. Solution: Using H5Pinsert, H5Pget, H5Pset to verify that the library indeed goes into the branch we hope for. Using H5_HAVE_INSTRUMENT macro to isolate these changes so that it won't affect or be misused by the application. Platforms tested: h5committest(shanti still refused to be connected) Parallel tests on heping somehow are skipped. Manually testing at heping. Have checked 1,2,3,4,5 processes. Misc. update:
* [svn-r12148] Purpose:MuQun Yang2006-03-231-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | Add tests for optional APIs to support collective chunk IO Description: In order to test whether library picks up the user's options, The number of chunks need to be varied for different processes, Selection of the number of processes selected in one chunk also need to be varied. Solution: Create two cases, 1. Each chunk only selected by one unique process, this case library should use independent for collective call. 2. One-third of the processes occupies the top half of the whole domain, The rest of the processes occupies the lower half of the domain. The total number of chunk is a fixed number 8. Platforms tested: Linux 2.4 with mpich 1.2.6(only) Since I only checked in the code that handles the selection, haven't added any new tests yet. So it won't affect any platforms. Misc. update:
* [svn-r12142] Purpose:MuQun Yang2006-03-231-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | change the array size of collective chunking features of parallel tests. Description: Previously array size for collective optimization tests including cchunk1, cchunk2, cchunk3, cchunk4, ccontw, ccontr, cschunkw, cschunkr, ccchunkw, ccchunkr are fixed, They are only valid for some good number of processors(1,2,3,4,6,8,12,16,24,32,48 etc). Recently there are more requests for parallel tests to be valid on some odd number of processes such as 5,7,11,13 etc. Solution: I change the array size to be dynamic rather than static. Now the fastest change array size is a function of mpi_size. dim2 = constant *mpi_size. After some tunings, theoretically the above tests should be valid for any number of processors. However, other parallel tests still need to be tuned. To verify the correctness of these tests, using mpirun -np 5 ./testphdf5 -b cchunk1 at heping. Platforms tested: h5committest(shanti is refused to be connected) at heping, 5 and 7 processes are used to verify the correctness. Misc. update:
* [svn-r11951] Purpose:MuQun Yang2006-02-161-0/+1
| | | | | | | | | | | | | | | | Enhance collective chunk IO supports Description: Add a new test to check the correctness of the HDF5 library behavior for collective IO mode when one process doesn't have any contribution for IO. Solution: Platforms tested: IBM AIX 5.2(copper) Linux (heping) mpich-1.2.6 Misc. update:
* [svn-r11312] Purpose:Albert Cheng2005-08-301-0/+1
| | | | | | | | | | | | | | | | | | Bug #281 Description: A dataset created in serial mode with H5D_ALLOC_TIME_INCR allocation setting was not extendible, either explicitly by H5Dextend or implicitly by writing to unallocated chunks. This was because parallel mode expects the allocation mode be H5D_ALLOC_TIME_INCR only. Solution: Modified library to allocate more space when needed or directed if the file is opened by parallel mode, independent of what the dataset allocation mode is. Platforms tested: Heping pp.
* [svn-r11245] Purpose:Quincey Koziol2005-08-131-85/+85
| | | | | | | | | | | | | | | | | | | | Code cleanup Description: Trim trailing whitespace, which is making 'diff'ing the two branches difficult. Solution: Ran this script in each directory: foreach f (*.[ch] *.cpp) sed 's/[[:blank:]]*$//' $f > sed.out && mv sed.out $f end Platforms tested: FreeBSD 4.11 (sleipnir) Too minor to require h5committest
* [svn-r11067] Purpose:MuQun Yang2005-07-121-12/+12
| | | | | | | | | | | | | | | | | | Updating phase 2 work of collective IO Description: The current collective IO tests cannot test for number of processors bigger than some values, this change will lift those restriction. However, the test may be slower. Solution: Platforms tested: linux 2.4, AIX 5.1, Linux 2.4 IA64 and IRIX 6.5 (I haven't tested big number of processors with the restriction of the machine) Misc. update:
* [svn-r10546] Purpose:MuQun Yang2005-04-051-10/+10
| | | | | | | | | | | | | | | | Support collective IO for irregular selection. Description: Solution: Platforms tested: Linux with MPICH AIX with mpcc_r Linux with ChaMPIO Altix with intel Misc. update:
* [svn-r10125] Purpose:Albert Cheng2005-03-031-70/+8
| | | | | | | | | | | | | | | Feature--to provide a standalone mode for t_mpi.c so that it can be built outside of PHDF5 environment. Description: Move definitions that are common to all parallel test programs to a new header file called testpar.h. Leave only Parallel HDF5 tests related definitions in testphdf5.h. Platforms tested: heping (pp) and modi4(PP). Copper was down. Misc. update:
* [svn-r9727] Purpose:Quincey Koziol2004-12-291-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | Bug Fix/Code Cleanup/Doc Cleanup/Optimization/Branch Sync :-) Description: Generally speaking, this is the "signed->unsigned" change to selections. However, in the process of merging code back, things got stickier and stickier until I ended up doing a big "sync the two branches up" operation. So... I brought back all the "infrastructure" fixes from the development branch to the release branch (which I think were actually making some improvement in performance) as well as fixed several bugs which had been fixed in one branch, but not the other. I've also tagged the repository before making this checkin with the label "before_signed_unsigned_changes". Platforms tested: FreeBSD 4.10 (sleipnir) w/parallel & fphdf5 FreeBSD 4.10 (sleipnir) w/threadsafe FreeBSD 4.10 (sleipnir) w/backward compatibility Solaris 2.7 (arabica) w/"purify options" Solaris 2.8 (sol) w/FORTRAN & C++ AIX 5.x (copper) w/parallel & FORTRAN IRIX64 6.5 (modi4) w/FORTRAN Linux 2.4 (heping) w/FORTRAN & C++ Misc. update:
* [svn-r9649] Purpose:MuQun Yang2004-12-081-0/+4
| | | | | | | | | | | | | | Adding routines to test irrgular hyperslab selection inside one chunk. Description: For debugging purpose, tests are turned off now. Solution: Platforms tested: AIX 5.1 and Linux 2.4 with parallel enabled. Misc. update:
* [svn-r9575] Purpose:MuQun Yang2004-11-241-8/+88
| | | | | | | | | | | | | | | | Adding testing code for collective IO implementation Description: Won't affect testing HDF5 library. Not tested yet, only check in for debugging purpose. Solution: Platforms tested: Linux 2.4 + mpich 1.2.6 Aix 5.1 + mpcc_r Misc. update:
* [svn-r9520] Purpose:MuQun Yang2004-11-111-0/+16
| | | | | | | | | | | | | | | | | | Adding general MPI derived datatype testing code. Description: The testing code will not be tested. The purpose of checking in is for better debugging later. HDF5 routine or daily test should not be aware of this. Solution: Platforms tested: Copper(AIX 5.1), Heping(Linux 2.4 + MPICH 1.2.6). Misc. update:
* [svn-r9358] Purpose:Quincey Koziol2004-10-041-1/+4
| | | | | | | | | | | | | | | Bug fix Description: Relax restrictions on parallel I/O to allow compressed, chunked datasets to be read in parallel (collective access will be degraded to independent access, but will retrieve the information still). Platforms tested: FreeBSD 4.10 (sleipnir) w/parallel Solaris 2.7 (arabica) IRIX64 6.5 (modi4) h5committest
* [svn-r9309] Purpose:Albert Cheng2004-09-221-9/+0
| | | | | | | | | | | | | | | Cleanup Description: Remove old hack for H5Eget_auto() which is not needed any more. Reverse H5E_set_auto_stack(H5EDEFAULT,...) back to previous code of H5E_set_auto(...). Same for H5E_get_auto_stack. Platforms tested: Only tested in Eirene PP as the change is pretty straight forward. Misc. update:
* [svn-r9274] Purpose:John Mainzer2004-09-181-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | Add test to verify the fix of the parallel I/O mode confusion bug. Description: While the parallel I/O mode confusion bug is fixed, an automated regression test for this bug would be useful. Solution: Added a modified version of the original bug demonstration program to testphdf5. Platforms tested: copper h5committested eirene (parallel) Misc. update:
* [svn-r9234] Purpose:Quincey Koziol2004-09-091-1/+1
| | | | | | | | | | | | | | | | | | | | | | | Code cleanup Description: Tweak recent "forward compatibility" changes to the H5E* API (which allowed for the old H5E API functions to remain unchanged) by allowing for the error stack callback function (H5E_auto_t) to also remain unchanged from the 1.6 branch. This required changing the H5E{get|set}_auto routines to have the old style H5E_auto_t type (which didn't have a stack ID parameter) and the new H5E{get|set}_auto_stack routines to have a newer "H5E_auto_stack_t" type (which has a stack ID parameter). This should make the H5E API changes as forwardly compatible as possible. One side-affect of this change was that it was impossible to determine if the current auto error callback was the old style (H5E_auto_t) or the new style (H5E_auto_stack_t) of callback, so a new API function (H5Eauto_is_stack) was adde to query this. Platforms tested: FreeBSD 4.10 (sleipnir) IRIX64 6.5 (modi4) h5committest
* [svn-r9071] Purpose:MuQun Yang2004-08-121-2/+2
| | | | | | | | | | | | | | | | Make collective chunk IO test more general Description: Previously collective chunk IO test is only fit for processor =4 with the dimension size to be set small; sometimes people would like to test with more than 4 processors(5,6 or more), the test therefore failed. Solution: To make the test case more general, dimensional size of the data is set to be large(right now 288 for each dimension), the disjoint hyperslab selection is re-calculated. Now the test cases should pass with 5,6 or 12 processors. Note, there is nothing wrong with the implementation of the library, it is the test case that causes the failure with the number of processor greater than 4. Platforms tested: Only at eirene, since only the test code is modified a little and it is very slow to test the parallel case. Misc. update:
* [svn-r8987] Purpose:Quincey Koziol2004-08-021-0/+1
| | | | | | | | | | | | Code cleanup Description: Fix another batch of minor differences between the development and release branches. Platforms tested: FreeBSD 4.10 (sleipnir) w/parallel Too minor to require h5committest
* [svn-r8932] Purpose:Quincey Koziol2004-07-221-18/+4
| | | | | | | | | | | | | | | | | | | | Code cleanup Description: Clean up collective chunking code a bit. Also, add '--enable-instrument' configure flag to have a mechanism for determining that optimized operations happened correctly in the library (instead of just the "normal" way) by allowing 'flag' properties to be set outside the library and set when the "right" thing happens. This is mainly for debugging and regression checks, so we make certain we don't break optimized I/O by accident. It's enabled by default when --enable-debug is on (which is on by default in the development branch and off by default in the release branch), but can also be independently controlled with its own configure flag. Platforms tested: FreeBSD 4.10 (sleipnir) w/parallel IBM p690 (copper) w/parallel