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authorQuincey Koziol <koziol@hdfgroup.org>2002-01-31 19:46:21 (GMT)
committerQuincey Koziol <koziol@hdfgroup.org>2002-01-31 19:46:21 (GMT)
commite0177ee0f35a759047126fc17f0e09b7b3f41395 (patch)
tree1f53aa369b8e691c0bc52f0bfe14ce1976f4a56c /release_docs
parent40c1792c7a10a3ee8df0326b53538daf4d419439 (diff)
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[svn-r4891] Purpose:
Code speedup Description: Chunking I/O routines are reading in an entire chunk when performing I/O on the chunk, even if the chunk will be too large to cache. Solution: If the chunk is too large to cache, uncompressed and has been allocated space in the file, or if we are using the MPI-I/O VFD, perform the I/O directly to the chunk, instead of reading the chunk into memory, updating it and immediately writing the entire chunk back out. Platforms tested: FreeBSD 4.5 (sleipnir) (using serial access) and IRIX64 6.5 (modi4) (using parallel access with MPI-I/O)
Diffstat (limited to 'release_docs')
-rw-r--r--release_docs/RELEASE.txt3
1 files changed, 3 insertions, 0 deletions
diff --git a/release_docs/RELEASE.txt b/release_docs/RELEASE.txt
index dda6309..911dcc9 100644
--- a/release_docs/RELEASE.txt
+++ b/release_docs/RELEASE.txt
@@ -218,6 +218,9 @@ New Features
H5Rget_object_type() to be only compiled into the library when v1.4
compatibility is enabled.
* Parallel HDF5 is now supported on HP-UX 11.00 platforms.
+ * Added support to read/write portions of chunks directly, if they are
+ uncompressed and too large to cache. This should speed up I/O on chunked
+ datasets for a few more cases. -QAK, 1/31/02
Platforms Tested