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* [svn-r7480] Purpose:Quincey Koziol2003-09-161-13/+13
| | | | | | | | | | | | | | | | | Bug fix Description: The MPI_File_set_size() routine on ASCI Red is not able to extend files so that they are larger than 2GB. Solution: Add an extra macro which controls whether MPI_File_set_size() can handle >2GB offsets or if our "older" way of reading a byte, then writing a byte at the appropriate offset should be used. Platforms tested: FreeBSD 4.9 (sleipnir) h5committest
* [svn-r7393] Purpose:Quincey Koziol2003-08-231-153/+155
| | | | | | | | | | | Code cleanup Description: De-linted more code Platforms tested: FreeBSD 4.8 (sleipnir) w/parallel too minor to require h5committest
* [svn-r7122] Purpose:Quincey Koziol2003-06-301-6/+2
| | | | | | | | | | | | | Code cleanup/Feature removal Description: Remove "round robin" writing of metadata in MPI VFDs (and a couple of other places). This never really worked the way I hoped it would and it causes problems on certain machines. Platforms tested: FreeBSD 4.8 (sleipnir) w/parallel Too small for triple check.
* [svn-r6843] Purpose:Quincey Koziol2003-05-091-5/+4
| | | | | | | | | | | | Code cleanup Description: Clean up warnings exposed by compiling on O2K. Also, revert some of Bill and my changes to the H5S_mpi_opt_types_g, etc. and settle them back into their original location. Platforms tested: h5committested.
* [svn-r6769] Purpose:Albert Cheng2003-04-281-18/+21
| | | | | | | | | | | | | | | | | | | | Minor improvement Description: Moved the H5FD_mpio_Debug initialization to H5FD_mpio_init() so that it is done only once instead of every file open. Fixed blocked out patch that checks on INFO object so that H5FD_mpio_Debug can be set via the INFO object. (All these had been done to v1.4, now folded them int v1.5) Platforms tested: Did not h5committest since this is purely parallel code. The changes were made in an isolated copy in Copper. Tested in Copper parallel. Misc. update:
* [svn-r6753] Purpose:Albert Cheng2003-04-251-5/+11
| | | | | | | | | | | | | | | | | | | | Code cleanup Description: Replaced the comm/info freeing with H5FD_mpio_comm_info_free to make it cleaner and consistent. Replaced couple FUNC_LEAVE_NOAPI(SUCCEED) with FUNC_LEAVE_NOAPI(ret_value). These were bugs since it was possible errors may occur at FUNC_ENTER...() time and this hardcoding would not report those errors. Documented some modification history. Platforms tested: Did not h5committested because these are all MPI code and well protected by HAVE_PARALLEL. Tested in eirene and modi4, both parallel mode. Misc. update:
* [svn-r6728] Purpose:Albert Cheng2003-04-221-3/+5
| | | | | | | | | | | | | | | | Silly bug fix. Description: Forgot to put the comm/info duplication code in. Solution: Put them back in. Platforms tested: Did not run h5committest since the changes are all in the MPIO driver code. Tested on eirene and Modi4, both parallel modes. Misc. update:
* [svn-r6708] Purpose:Albert Cheng2003-04-181-43/+319
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Bug fixes/API changes Description: Previously, the Communicator and Info object arguments supplied to H5Pset_fapl_mpio() are stored in the property with its handle values. This meant changes to the communicator or the Info object after calling H5Pset_fapl_mpio would affect the how the property list function. This was also the case when H5Fopen/create operated. They just stored the handle value. This is not according to the MPI-2 defined behavior of how Info objects should be handled. (MPI-2 defines Info objects must be parsed when called.) The old design was trying to avoid numerous duplicates of the same information (e.g., every property object holds one version, every file opened holds another version, when all of them are referring to the same original version.) Nevertheless it is safer to implement it according to MPI-2 definition. Futhermore, the library often needs to do message passing using the supplied communicator. Using the same communicator as the application version may result in some messages mix up. Solution: H5Pset_fapl_mpio now stores a duplicate of each of the communicator and Info object. H5Pget_fapl_mpio returns a duplicate of its stored communicator and Info object. It is now the responsibility of the applications to free those objects when done. H5Fopen/create also stores a duplicate of the communicator and Info object supplied by the File Access Property list. H5Fclose frees those duplicates. There are a few more internal VFL call back functions that they follow this "make duplicates" requirement. Platforms tested: "h5committested". What other platforms/configurations were tested? Eirene (mpicc), sol(mpicc), copper(parallel) Misc. update:
* [svn-r6501] Purpose:Bill Wendling2003-03-191-1/+3
| | | | | | | | | | | | | | New Feature Description: Added support for the lock and unlock function calls for file drivers. Only FPHDF5 uses this feature. All of these drivers don't define lock or unlock methods. Platforms tested: Linux, Modi4, Sol Misc. update:
* [svn-r6468] Purpose:Quincey Koziol2003-03-061-1/+1
| | | | | | | | | | | | | | Potential bug fix. Description: The code to rotate the metadata writing process may not be compiled correctly in all cases. Solution: Change from using "++mpi_round" to "mpi_round+1" Platforms tested: Eyeballed...
* [svn-r6398] Purpose:Quincey Koziol2003-02-121-1/+1
| | | | | | | | | | Code cleanup Description: Clean up some compiler warnings Platforms tested: FreeBSD 4.7 (sleipnir)
* [svn-r6387] Purpose:Quincey Koziol2003-02-101-35/+28
| | | | | | | | | | | | | | | | | | | | | | | | | | | Bug Fix Description: Metadata cache in parallel I/O can cause hangs in applications which perform independent I/O on chunked datasets, because the metadata cache can attempt to flush out dirty metadata from only a single process, instead of collectively from all processes. Solution: Pass a dataset transfer property list down from every API function which could possibly trigger metadata I/O. Then, split the metadata cache into two sets of entries to allow dirty metadata to be set aside when a hash table collision occurs during independent I/O. Platforms tested: Tested h5committest {arabica (fortran), eirene (fortran, C++) modi4 (parallel, fortran)} FreeBSD 4.7 (sleipnir) serial & parallel Misc. update: Updated release_docs/RELEASE
* [svn-r6372] Purpose:Bill Wendling2003-02-031-1/+1
| | | | | | | | | | Buglet Description: The title of the function in FUNC_ENTER_* was wrong. Solution: Changed to correct title. Platforms tested: Linux (small change).
* [svn-r6313] Purpose:Albert Cheng2003-01-221-8/+23
| | | | | | | | | | | Updated Description: Updated Copyright notice. Replaced HGOTO_ERROR calls involving MPI calls with HMPI_GOTO_ERROR. Platforms tested: Tested h5committest {arabica (fortran), eirene (fortran, C++) modi4 (parallel, fortran)}? Tested on Eirene (PP) only since the code is in the MPIO module only.
* [svn-r6266] Purpose:Quincey Koziol2003-01-101-25/+25
| | | | | | | | | | | | Code cleanup/new feature. Description: Split FUNC_LEAVE into API and non-API specific versions. This allows a solution to compiling this branch with C++, as well as reducing the size of the binaries produced. Platforms tested: FreeBSD 4.7 (sleipnir) w/serial, parallel (including MPE) & thread-safe
* [svn-r6252] Purpose:Quincey Koziol2003-01-091-3/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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
* [svn-r5987] Purpose:Quincey Koziol2002-10-141-1/+1
| | | | | | | | | | | | | Code cleanup Description: Clean up compile warnings. Platforms tested: FreeBSD 4.6 (sleipnir) w and w/o parallel Linux 2.2.x (eirene) w/FORTRAN & C++ Solaris 2.7 (arabica) w/FORTRAN IRIX64 6.5 (modi4) w/FORTRAN & parallel
* [svn-r5951] Raymond Lu2002-09-301-0/+34
| | | | | | | | | | | Purpose: New API functions Description: Added API functions to return pointer to low-level file handle (H5Fget_vfd_handle and H5FDget_vfd_handle) and related property list setting functions(H5Pset_family_offset and H5Pset_multi_type). Platforms tested: Linux 2.2(eirene), Solaris 2.7(arabica), IRIX64 6.5(modi4)
* [svn-r5871] Purpose:Quincey Koziol2002-08-121-7/+7
| | | | | | | | | | | | | | | | Code cleanup Description: Combined H5P_isa_class and H5I_object functionality into a new internal H5P API function: H5P_object_verify, which checks that a property list is the appropriate class and then returns the property list object associated with the property list ID. This reduces the source code by about 200 LOC and trims the library binary some more. Platforms tested: FreeBSD 4.6 (sleipnir)
* [svn-r5867] Purpose:Quincey Koziol2002-08-091-8/+42
| | | | | | | | | | | | | Code cleanup Description: Changed the last HRETURN* statements in the FUNC_ENTER macros into HGOTO* macros, which reduces the size of the library binary in certain configurations by another 10% Platforms tested: FreeBSD 4.6 (sleipnir) serial & parallel, IRIX64 6.5 (modi4) serial & parallel
* [svn-r5842] Purpose:Quincey Koziol2002-08-081-95/+120
| | | | | | | | | | | | | | | | Code cleanup Description: Change most (all?) HRETURN_ERROR macros to HGOTO_ERROR macros, along with HRETURN macros to HGOTO_DONE macros. This unifies the error return path from functions and reduces the size of the library by up to 10% on some platforms. Additionally, I improved a lot of the error cleanup code in many routines. Platforms tested: FreeBSD 4.6 (sleipnir) serial & parallel and IRIX64 6.5 (modi4) serial & parallel.
* [svn-r5814] Purpose:Quincey Koziol2002-07-191-29/+40
| | | | | | | | | | | | | | | | | | Bug Fix Description: It was possible to create corrupted metadata information (either in memory or in the file or both) with a parallel I/O program because of the way metadata writes were being handled for writes out of the metadata cache. Solution: Added a dataset transfer property called "block before metadata write" which is used by the MPI-I/O and MPI-posix drivers to sync up all the processes before attempting a metadata write. This property is currently only for metadata writes from the metadata cache. Platforms tested: IRIX64 6.5 (modi4) w/parallel
* [svn-r5799] Purpose:Quincey Koziol2002-07-151-2/+2
| | | | | | | | | | | | New feature. Description: Added MPI-posix VFL driver. This driver uses MPI to coordinate actions, but performs I/O directly with posix sec(2) I/O functions. This driver should _NOT_ be used if the file accessed is not on a parallel filesystem. Platforms tested: FreeBSD 4.6 (sleipnir) w/parallel & IRIX64 6.5 (modi4) w/parallel
* [svn-r5690] Purpose:Quincey Koziol2002-06-241-29/+42
| | | | | | | | | | | | | | | | | | | | | | | | | | Bug Fix Description: When parallel I/O is used, the MPI-I/O VFL driver uses a "lazy" model to call MPI_File_set_view() in order to reduce the number of calls to this function. However, this is unsafe, because if a collective I/O which uses MPI derived types (and thus uses MPI_File_set_view()) is immediately followed by an independent I/O, the code will attempt to call MPI_File_set_view() in order to switch back to the default view of the file. MPI_File_set_view() is a collective call however, and this causes the application to hang. Solution: Removed "lazy" MPI_File_set_view() code, instead set the file view when it is needed (with MPI derived types) and immediately set the file view back to the default view before leaving the I/O routine. Platforms tested: IRIX64 6.5 (modi4) w/parallel. Also, tested with the latest development and release code for the SAF library, which now works correctly with this change. (Although the release branch of the SAF library seems to have a bug, this 1.4.4 release candidate code gets as far as the version the SAF library is released on top of (1.4.2-patch1, I believe)).
* [svn-r5677] Purpose:Quincey Koziol2002-06-191-1/+1
| | | | | | | | | | | Code improvement Description: Some small code cleanups and took out the code the was turning off the metadata cache for parallel I/O (!) Platforms tested: IRIX64 6.5 (modi4) w/parallel
* [svn-r5674] Purpose:Quincey Koziol2002-06-191-8/+5
| | | | | | | | | | Code cleanup Description: Removed more compiler warnings, etc. Platforms tested: Linux 2.2.x (eirene) w/parallel
* [svn-r5667] Purpose:Quincey Koziol2002-06-191-0/+2
| | | | | | | | | | Code cleanup Description: Turn on more warnings in the IRIX builds and clean them up. Platforms tested: IRIX64 6.5 (modi4) w/parallel
* [svn-r5660] Purpose:Quincey Koziol2002-06-181-39/+37
| | | | | | | | | | | | Code optimization Description: Avoid creating MPI types (and thus requiring a MPI_File_set_view() call) when contiguous selections are used for dataset I/O. This should be a performance improvement for those sorts of selections. Platforms tested: Linux 2.2.x (eirene) w/parallel && IRIX64 6.5 (modi4) w/parallel & FORTRAN
* [svn-r5652] Purpose:Quincey Koziol2002-06-171-28/+89
| | | | | | | | | | | | Code cleanup Description: Use dataset transfer property list to hold information about the MPI types for the current transfer, instead of setting pseudo-global variables in the file's struct. Platforms tested: Linux 2.2.x (eirene) w/parallel & IRIX64 6.5 (modi4) w/parallel & FORTRAN
* [svn-r5650] Purpose:Quincey Koziol2002-06-171-17/+53
| | | | | | | | | | | | Code cleanup Description: Change MPI-I/O code to use the address of the dataset for the displacement, instead of having a separate displacement value. Removed displacement parameter from H5FD_mpio_setup parameters. Platforms tested: Linux 2.2.x (eirene) w/parallel & IRIX64 6.5 (modi4) w/parallel.
* [svn-r5550] Purpose:Quincey Koziol2002-06-071-0/+9
| | | | | | | | | | | | | | | | | Code Improvement Description: Split the metadata accumulator code into two parts: one for allowing writes of the accumulator buffer during reads (when the buffer is dirty and needs to be flushed to disk in order to hold the new metadata being read in) and another for only allowing writes of the buffer during writes. This allows the MPI-I/O VFL driver to use the metadata accumulator (but only during writes) and benefit from the reduced number of metadata I/O operations that it brings. Platforms tested: IRIX64 6.5 (modi4) w/parallel
* [svn-r5536] Purpose:Quincey Koziol2002-06-051-0/+1
| | | | | | | | | | | | | | | | | New feature. Description: Added a "small data" block allocation mechanism to the library, similar to the mechanism used for allocating metadata currently. See the RFC for more details: http://hdf.ncsa.uiuc.edu/RFC/SmallData/SmallData.html This reduces the number of I/O operations which hit the disk for my test program from 19 to 15 (i.e. from 393 to 15, overall). Platforms tested: Solaris 2.7 (arabica) w/FORTRAN and FreeBSD 4.5 (sleipnir) w/C++
* [svn-r5530] Purpose:Bill Wendling2002-06-041-3/+5
| | | | | | | | | | | | | | | Code Cleanup Description: Removed some compiler warnings. Solution: In a few cases, NULL was being returned when a FAIL was supposed to be returned instead. There were some header files which needed to be included in a few of the sources. A couple of if-then statements had assignments in the conditional part. The compiler warned that they should have extra "()"s around them. Made the code check the values instead. Platforms tested: Linux (parallel) Modi4 (parallel)
* [svn-r5471] Purpose:Quincey Koziol2002-05-291-37/+48
| | | | | | | | | | | | | | | | Code cleanup Description: Broke the FUNC_ENTER macro into several macros, with more specialized uses (which followup mail will describe). This was designed to move most/all of the checks which could be done at compile time to that point, instead of needlessly performing them (over & over :-) at run-time. This reduces the library's size (and thus staticly linked binaries) and has a minor speedup effect also. Platforms tested: IRIX64 6.5 (modi4) with parallel & FORTRAN enabled, and additional testing on FreeBSD and Solaris immediately after the checkin.
* [svn-r5467] Purpose:Quincey Koziol2002-05-281-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | Code cleanup. Description: Took Robb's recent ideas for improving the FUNC_ENTER/FUNC_LEAVE macros equivalents in the SAF library and adapted them to our library. I added an additional macro which is equivalent to FUNC_ENTER: FUNC_ENTER_NOINIT - Has the API tracing code, etc. from FUNC_ENTER but none of the library or interface initialization code. This is to be used _only_ for static functions and those which explicitly cannot have the library or interface initialization code enabled (like the API termination routines, etc.). This allowed many more of the functions in the library [but not all yet :-(] to be wrapped with FUNC_ENTER[_NOINIT]/FUNC_LEAVE pairs. It also reduced the size of the library and executables (by cutting out a bunch of code which was never executed), I'll e-mail the exact results when I've finished editing it. Platforms tested: IRIX64 6.5 (modi4)
* [svn-r5447] Purpose:Quincey Koziol2002-05-211-34/+40
| | | | | | | | | | | Code cleanup Description: Guard against getting into metadata broadcast in write routine and clean up some error handling. Platforms tested: IRIX64 6.5 (modi4)
* [svn-r5440] Purpose:Quincey Koziol2002-05-201-38/+3
| | | | | | | | | | | New feature Description: Add 'closing' parameter to H5FDflush and VFL "flush" functions, per http://hdf.ncsa.uiuc.edu/RFC/VFLFlush/VFLFlush.html Platforms tested: IRIX64 6.5 (modi4)
* [svn-r5429] Purpose:Quincey Koziol2002-05-171-0/+56
| | | | | | | | | | | | | | | | | | | | | Bug fix/Code improvement. Description: Currently, the chunk data allocation routine invoked to allocate space for the entire dataset is inefficient. It writes out each chunk in the dataset, whether it is already allocated or not. Additionally, this happens not only when it is created, but also anytime it is opened for writing, or the dataset is extended. Worse, there's too much parallel I/O syncronization, which slows things down even more. Solution: Only attempt to write out chunks that don't already exist. Additionally, share the I/O writing between all the nodes, instead of writing everything with process 0. Then, only block with MPI_Barrier if chunks were actually created. Platforms tested: IRIX64 6.5 (modi4)
* [svn-r5419] Purpose:Quincey Koziol2002-05-141-0/+11
| | | | | | | | | | | Bug fix. Description: Added barrier to flush routine to prevent race condition where file could be truncated. Platforms tested: IRIX64 6.5 (modi4)
* [svn-r5418] Purpose:Quincey Koziol2002-05-141-30/+26
| | | | | | | | | | | | | | | | Code cleanup/Performance enhancement Description: The code to extend the file size in H5FD_mpio_flush is getting run even when the file size doesn't change. Also, it's sort of sidestepping MPI-I/O when extending the file, instead of using MPI-I/O features to set the file's size. Solution: Only extend the file's size when the allocated size has increased. Also use MPI_File_set_size() to change the file's size. Platforms tested: IRIX64 6.5 (modi4)
* [svn-r5412] Purpose:Quincey Koziol2002-05-141-17/+50
| | | | | | | | | | | | | | | | Bug fix Description: Calling MPI_Get_count needs to be done with the same MPI type as was used for the transfer and we are always using MPI_BYTE, even when a different MPI type was used for the transfer. Solution: Only query MPI_Get_count with MPI_BYTE when we really used MPI_BYTE for the transfer. Wait for later to query MPI_Get_count with other MPI types. Platforms tested: IRIX64 6.5 (modi4)
* [svn-r5408] Purpose:Quincey Koziol2002-05-131-2/+41
| | | | | | | | | | | | | | | Performance enhancement Description: Doing an MPI_File_sync() just before a file is closed causing a large performance loss. Solution: Add flag to MPI file driver to avoid performance the MPI_File_sync() when the flag is set before a call to H5F_flush(). Platforms tested: IRIX64 6.5 (modi4)
* [svn-r5403] Purpose:Quincey Koziol2002-05-131-9/+4
| | | | | | | | | | Back out changes. Description: Back out changes to VFL 'flush' API function, pending review. Platforms tested: IRIX64 6.5 (modi4)
* [svn-r5393] Purpose:Quincey Koziol2002-05-101-5/+9
| | | | | | | | | | | | | | | | | | | | | | New Feature Description: The VFL flush function is called immediately before a file is closed. This can cause duplicate syncronization actions to occur, if the VFL close function also performs them. Solution: Added 'closing' parameter to VFL 'flush' operation. This allows the VFL flush function to bypass operations that will be duplicated within the VFL close function. Additionally, use the 'closing' parameter to bypass calls to MPI_File_sync() when set. Since MPI_File_close() also syncronizes the file, this avoids the terrible performance hit taken when calling MPI_File_sync() as the file is closing. Platforms tested: IRIX64 6.5 (modi4)
* [svn-r5390] Purpose:Quincey Koziol2002-05-101-48/+11
| | | | | | | | | | | | | | | | | | | | | | Code cleanup Description: The parallel I/O file driver is optimized to only write metadata with one process (and broadcast the results to the other processes). This is currently enabled by a separate call to H5FD_mpio_tas_allsame() before each metadata write to the file. This can easily lead to problems where the prelude function call is omitted before the actual write code or, in a threaded environment, lead to race condititions where the value set is reset before being used. Solution: Since we only want to write metadata from one process, key off of the 'type' parameter (which has information about whether the data being written it metadata or raw data) to H5FD_mpio_write() as the method for determining whether to only write from one process or not. Platforms tested: IRIX64 6.5 (modi4)
* [svn-r5385] Purpose:Quincey Koziol2002-05-101-4/+21
| | | | | | | | | | | | | | | New Feature Description: Currently, only process 0 writes metadata to disk, leading to a potential performance bottleneck as the other processors wait for it to catch up. Solution: Rotate the metadata responsibilities among all processes, speading out the work. Platforms tested: IRIX64 6.5 (modi4)
* [svn-r5381] Purpose:Quincey Koziol2002-05-091-32/+19
| | | | | | | | | | | Small code cleanup/improvement Description: Query the MPI rank only once and store it in the file structure for each process. Platforms tested: IRIX64 6.5 (modi4)
* [svn-r5135] Purpose:Albert Cheng2002-04-031-6/+11
| | | | | | | | | | | | | | | | | | | | | | Features. Description: Error stack used to report only hdf5 predefined error messages because it takes only static strings. Runtime defined messages were not pushed to the stack. Added the means and macros to push MPI error strings onto the hdf5 error stack. Added a new minor error class as H5E_MPIERR for this class of messages. H5Epulbic.h, H5E.c: Added H5E_MPIERR and its minor class description. H5Eprivate.h: Added HMPI_XXX macros to push MPI error strings to the stack. H5FDmpio.c: Changed couple places to use the new macros to test the new macros. A more through changes to make use of these new macros will be done later. Platforms tested: eirene (serial, parallel) modi4(parallel)
* [svn-r4732] Bill Wendling2001-12-181-3/+3
| | | | | | | | | | | | | | | Purpose: Bug Fix Description: Committing the changes in the MPI/IO stuff so that parallel HDF5 will work on HP-UX. It seems that on HP-UX, the MPI_Status variable needs to be initialized to 0 for it to work (i.e., in some other MPI calls, if there's garbage in the MPI_Status variable, then it will barf). Solution: Initialized to 0. Platforms tested: HP-UX parallel, Linux.
* [svn-r4696] Raymond Lu2001-12-111-0/+1
| | | | | | | | | | | | | | | | | Purpose: Modify H5Fclose behavior Description: The HDF5 actual file close behaves in several ways in terms of if there are still objects(dataset, group, datatype) opened in file. Solution: Added a new file access property, file close degree. It has four values, H5F_CLOSE_DEFAULT H5F_CLOSE_WEAK H5F_CLOSE_SEMI H5F_CLOSE_STRONG The way a file is closed is decided by these values. Platforms tested: IRIX64 6.5, SunOS 5.6, FreeBSD 4.4
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