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Diffstat (limited to 'release_docs/RELEASE.txt')
| -rw-r--r-- | release_docs/RELEASE.txt | 57 |
1 files changed, 56 insertions, 1 deletions
diff --git a/release_docs/RELEASE.txt b/release_docs/RELEASE.txt index b7c2446..dfae866 100644 --- a/release_docs/RELEASE.txt +++ b/release_docs/RELEASE.txt @@ -93,8 +93,46 @@ New Features Library: -------- - - + - Several improvements to parallel compression feature, including: + + * Improved support for collective I/O (for both writes and reads) + + * Significant reduction of memory usage for the feature as a whole + + * Reduction of copying of application data buffers passed to H5Dwrite + + * Addition of support for incremental file space allocation for filtered + datasets created in parallel. Incremental file space allocation is the + default for these types of datasets (early file space allocation is + also still supported), while early file space allocation is still the + default (and only supported allocation time) for unfiltered datasets + created in parallel. Incremental file space allocation should help with + parallel HDF5 applications that wish to use fill values on filtered + datasets, but would typically avoid doing so since dataset creation in + parallel would often take an excessive amount of time. Since these + datasets previously used early file space allocation, HDF5 would + allocate space for and write fill values to every chunk in the dataset + at creation time, leading to noticeable overhead. Instead, with + incremental file space allocation, allocation of file space for chunks + and writing of fill values to those chunks will be delayed until each + individual chunk is initially written to. + + * Addition of support for HDF5's "don't filter partial edge chunks" flag + (https://portal.hdfgroup.org/display/HDF5/H5P_SET_CHUNK_OPTS) + + * Addition of proper support for HDF5 fill values with the feature + * Addition of 'H5_HAVE_PARALLEL_FILTERED_WRITES' macro to H5pubconf.h + so HDF5 applications can determine at compile-time whether the feature + is available + + * Addition of simple examples (ph5_filtered_writes.c and + ph5_filtered_writes_no_sel.c) under examples directory to demonstrate + usage of the feature + + * Improved coverage of regression testing for the feature + + (JTH - 2022/2/23) Fortran Library: ---------------- @@ -151,6 +189,23 @@ Bug Fixes since HDF5-1.10.7 release =================================== Library ------- + - Fixed a metadata cache bug when resizing a pinned/protected cache entry + + When resizing a pinned/protected cache entry, the metadata + cache code previously would wait until after resizing the + entry to attempt to log the newly-dirtied entry. This would + cause H5C_resize_entry to mark the entry as dirty and make + H5AC_resize_entry think that it doesn't need to add the + newly-dirtied entry to the dirty entries skiplist. + + Thus, a subsequent H5AC__log_moved_entry would think it + needs to allocate a new entry for insertion into the dirty + entry skip list, since the entry doesn't exist on that list. + This causes an assertion failure, as the code to allocate a + new entry assumes that the entry is not dirty. + + (JRM - 2022/02/28) + - Issue #1436 identified a problem with the H5_VERS_RELEASE check in the H5check_version function. |