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| author | Quincey Koziol <koziol@hdfgroup.org> | 2002-01-31 19:46:21 (GMT) |
|---|---|---|
| committer | Quincey Koziol <koziol@hdfgroup.org> | 2002-01-31 19:46:21 (GMT) |
| commit | e0177ee0f35a759047126fc17f0e09b7b3f41395 (patch) | |
| tree | 1f53aa369b8e691c0bc52f0bfe14ce1976f4a56c /release_docs/RELEASE.txt | |
| parent | 40c1792c7a10a3ee8df0326b53538daf4d419439 (diff) | |
| download | hdf5-e0177ee0f35a759047126fc17f0e09b7b3f41395.zip hdf5-e0177ee0f35a759047126fc17f0e09b7b3f41395.tar.gz hdf5-e0177ee0f35a759047126fc17f0e09b7b3f41395.tar.bz2 | |
[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/RELEASE.txt')
| -rw-r--r-- | release_docs/RELEASE.txt | 3 |
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 |