diff options
Diffstat (limited to 'release_docs')
| -rw-r--r-- | release_docs/RELEASE.txt | 26 |
1 files changed, 20 insertions, 6 deletions
diff --git a/release_docs/RELEASE.txt b/release_docs/RELEASE.txt index 8ed0a27..8f24b8c 100644 --- a/release_docs/RELEASE.txt +++ b/release_docs/RELEASE.txt @@ -146,14 +146,28 @@ New Features - Add ability to minimze dataset object headers. + Creation of many, very small datasets resulted in extensive file bloat + due to extra space in the dataset object headers -- this space is + allocated by default to allow for the insertion of a small number of + attributes within the object header and not require a continuation + block, an unnecessary provision in the target use case. + Inform the library to expect no attributes on created datasets, and to allocate the least space possible for the object headers. - A continuation block is created if attributes are added to a 'minimized' - dataset, which can reduce performance. - - H5Pget/set_dset_no_attrs_hint, H5Fget/set_no_dset_attrs_hint - - (TRILAB-45) + NOTE: A continuation block is created if attributes are added to a + 'minimized' dataset, which can reduce performance. + NOTE: Some extra space is allocated for attributes essential to the + correct behavior of the object header (store creation times, e.g.). This + does not violate the design principle, as the space is calculated and + allocated as needed at the time of dataset object header creation -- + unused space is not generated. + New API calls: + H5Fget_dset_no_attrs_hint + H5Fset_dset_no_attrs_hint + H5Pget_dset_no_attrs_hint + H5Pset_dset_no_attrs_hint + + (JOS - 2019/01/04, TRILAB-45) Parallel Library: |