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authorQuincey Koziol <koziol@hdfgroup.org>2002-06-18 14:02:17 (GMT)
committerQuincey Koziol <koziol@hdfgroup.org>2002-06-18 14:02:17 (GMT)
commit972707dcd3a123df1435d35d6b6a585222a1b6df (patch)
tree973d2485c9b9c46ad394903ad284b86cdf4b007e /release_docs/RELEASE.txt
parentad9ca47cecd23223ad8dd58d9e73193fdcf8cf76 (diff)
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[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
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diff --git a/release_docs/RELEASE.txt b/release_docs/RELEASE.txt
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@@ -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