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authorjhendersonHDF <jhenderson@hdfgroup.org>2022-08-09 23:05:37 (GMT)
committerGitHub <noreply@github.com>2022-08-09 23:05:37 (GMT)
commitef33ac8bac5fd201b41d1a3084f03834f47729a2 (patch)
treead4756b872abff6d16f11d9a6c6c949e8f359cad /release_docs/RELEASE.txt
parentb84241e57a97309b15846da4cc74611a66d92f6d (diff)
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Subfiling VFD - tidying up and fixing a few new testing failures (#1977)
* Rename Subfiling IOC "thread_pool_count" field to "thread_pool_size" * Add simple HDF5 example for Subfiling VFD * Subfiling VFD - never cache app topology as it may change * Subfiling VFD - cleanup unused funtionality and tidy up some TODOs * Subfiling VFD - tidy up subfiling error handling in H5subfiling_common.c * Subfiling VFD - show number of failed I/O requests on close * Subfiling VFD - Update file cmp callback after switching to MPI I/O VFD * Amend RELEASE.txt with info about h5fuse.sh and Subfiling limitations * Subfiling VFD - switch to using H5_basename and H5_dirname
Diffstat (limited to 'release_docs/RELEASE.txt')
-rw-r--r--release_docs/RELEASE.txt19
1 files changed, 18 insertions, 1 deletions
diff --git a/release_docs/RELEASE.txt b/release_docs/RELEASE.txt
index ab43011..c7b41cd 100644
--- a/release_docs/RELEASE.txt
+++ b/release_docs/RELEASE.txt
@@ -103,8 +103,25 @@ New Features
while also minimizing the locking issues of the single shared file approach
on a parallel file system.
+ Also included with the Subfiling VFD is a new h5fuse.sh script which
+ reads a Subfiling configuration file and then combines the various
+ sub-files back into a single HDF5 file. By default, the h5fuse.sh script
+ looks in the current directory for the Subfiling configuration file,
+ but can also be pointed to the configuration file with a command-line
+ option.
+
The Subfiling VFD can be used by calling H5Pset_fapl_subfiling() on a
- File Access Property List and using that FAPL for file operations.
+ File Access Property List and using that FAPL for file operations. Note
+ that the Subfiling VFD currently has the following limitations:
+
+ * Does not currently support HDF5 collective I/O, other than collective
+ metadata writes and reads as set by H5Pset_coll_metadata_write() and
+ H5Pset_all_coll_metadata_ops()
+
+ * The Subfiling VFD should not currently be used with an HDF5 library
+ that has been built with thread-safety enabled. This can cause deadlocks
+ when failures occur due to interactions between the VFD's internal
+ threads and HDF5's global lock.
(JTH - 2022/07/22)