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| author | Quincey Koziol <koziol@hdfgroup.org> | 2002-06-18 14:02:17 (GMT) |
|---|---|---|
| committer | Quincey Koziol <koziol@hdfgroup.org> | 2002-06-18 14:02:17 (GMT) |
| commit | 972707dcd3a123df1435d35d6b6a585222a1b6df (patch) | |
| tree | 973d2485c9b9c46ad394903ad284b86cdf4b007e /release_docs | |
| parent | ad9ca47cecd23223ad8dd58d9e73193fdcf8cf76 (diff) | |
| download | hdf5-972707dcd3a123df1435d35d6b6a585222a1b6df.zip hdf5-972707dcd3a123df1435d35d6b6a585222a1b6df.tar.gz hdf5-972707dcd3a123df1435d35d6b6a585222a1b6df.tar.bz2 | |
[svn-r5660] Purpose:
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
Diffstat (limited to 'release_docs')
| -rw-r--r-- | release_docs/RELEASE.txt | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/release_docs/RELEASE.txt b/release_docs/RELEASE.txt index 4ed8cbe..586d1e4 100644 --- a/release_docs/RELEASE.txt +++ b/release_docs/RELEASE.txt @@ -181,11 +181,15 @@ Documentation New Features ============ + * Changed MPI I/O routines to avoid creating MPI derived types (and thus + needing to set the file view) for contiguous selections within datasets, + which should result in some performance improvement for those types of + selections. QAK - 2002/06/18 * Enable MPI type support for collective I/O to be enabled by default. This can be disabled by setting the HDF5_MPI_OPT_TYPES environment variable to the value "0". QAK - 2002/06/14 - * Allow chunks in chunked datasets to be cached when file is opened for - read-only access (bug #709). QAK - 2002/06/10 + * Allow chunks in chunked datasets to be cached when parallel file is + opened for read-only access (bug #709). QAK - 2002/06/10 * Added internal "small data" aggregation, which can reduce the number of actual I/O calls made, improving performance. QAK - 2002/06/05 * Improved internal metadata aggregation, which can reduce the number of |