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| author | Vailin Choi <vchoi@hdfgroup.org> | 2019-09-27 17:39:31 (GMT) |
|---|---|---|
| committer | Vailin Choi <vchoi@jam.ad.hdfgroup.org> | 2019-09-30 18:50:59 (GMT) |
| commit | 6ffdd4f2d6940de217152fd251ee748622a3241b (patch) | |
| tree | 3eee5424ffa35877703d0f9cef222839d9d90917 /release_docs | |
| parent | d6d7ac084b949d8c9e95e18f6b662d3cf786cbe8 (diff) | |
| download | hdf5-6ffdd4f2d6940de217152fd251ee748622a3241b.zip hdf5-6ffdd4f2d6940de217152fd251ee748622a3241b.tar.gz hdf5-6ffdd4f2d6940de217152fd251ee748622a3241b.tar.bz2 | |
Merge pull request #1934 in HDFFV/hdf5 from ~VCHOI/my_third_fork:bugfix/HDFFV-10585-investigate-slowness-of-regular to develop
* commit '7924eee0e5ee0745b784c635042b8633886fb799':
(1) Address the feedback from the PR review (2) Add release notes
Fix for HDFFV-10585 investigate hyperslab slowness: 1) Improve hyperslab performance when doing I/O from 1-d disjoint file dataspace to 1-d contiguous memory dataspace. 2) Move coding in H5D__chunk_io_init() that is constructing the chunk mappings to a separate routine.
Diffstat (limited to 'release_docs')
| -rw-r--r-- | release_docs/RELEASE.txt | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/release_docs/RELEASE.txt b/release_docs/RELEASE.txt index 9c91a0b..ba9af1b 100644 --- a/release_docs/RELEASE.txt +++ b/release_docs/RELEASE.txt @@ -362,6 +362,19 @@ Bug Fixes since HDF5-1.10.3 release Library ------- + - Fixed the slowness of regular hyperslab selection in a chunked dataset + + It was reported that the selection of every 10th element from a 20G + chunked dataset was extremely slow and sometimes could hang the system. + The problem was due to the iteration and the building of the span tree + for all the selected elements in file space. + + As the selected elements are going to a 1-d contiguous single block + memory space, the problem was fixed by building regular hyperslab selections + in memory space for the selected elements in file space. + + (VC - 2019/09/26, HDFFV-10585) + - Fixed a bug caused by bad tag value when condensing object header messages |