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authorQuincey Koziol <koziol@hdfgroup.org>2002-06-24 13:47:14 (GMT)
committerQuincey Koziol <koziol@hdfgroup.org>2002-06-24 13:47:14 (GMT)
commitace1f474b7135b1c479c5232643cabc477038350 (patch)
tree169a3af1de0b5b5dc937c30c831446832cd8149e /release_docs/RELEASE.txt
parent4e184b81a232187ae6f21daf783c35f0bc6dacc1 (diff)
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[svn-r5690] Purpose:
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)).
Diffstat (limited to 'release_docs/RELEASE.txt')
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diff --git a/release_docs/RELEASE.txt b/release_docs/RELEASE.txt
index c07a2a3..58fc2b5 100644
--- a/release_docs/RELEASE.txt
+++ b/release_docs/RELEASE.txt
@@ -35,6 +35,9 @@ Bug Fixes since HDF5-1.4.0
Library
-------
+ * Fixed bug in parallel I/O routines where a collective I/O which used
+ MPI derived types, followed by an independent I/O would cause the library
+ to hang. QAK 2002/06/24
* Fixed bug in chunking routines where they were using internal allocation
free routines, instead of malloc/free, preventing user filters from
working correctly. Chunks are now allocated/freed with malloc/free and