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Diffstat (limited to 'release_docs/RELEASE.txt')
| -rw-r--r-- | release_docs/RELEASE.txt | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/release_docs/RELEASE.txt b/release_docs/RELEASE.txt index 7f2468d..ab43011 100644 --- a/release_docs/RELEASE.txt +++ b/release_docs/RELEASE.txt @@ -85,7 +85,28 @@ New Features Library: -------- - - + - Subfiling VFD + + The HDF5 Subfiling VFD is a new MPI-based file driver that allows an + HDF5 application to distribute an HDF5 file across a collection of + "sub-files" in equal-sized data segment "stripes". I/O to the logical + HDF5 file is then directed to the appropriate "sub-file" according to + the Subfiling configuration and a system of I/O concentrators, which + are MPI ranks operating worker threads. + + By allowing a configurable stripe size, number of I/O concentrators and + method for selecting MPI ranks as I/O concentrators, the Subfiling VFD + aims to enable an HDF5 application to find a middle ground between the + single shared file and file-per-process approaches to parallel file I/O + for the particular machine the application is running on. In general, the + goal is to avoid some of the complexity of the file-per-process approach + while also minimizing the locking issues of the single shared file approach + on a parallel file system. + + The Subfiling VFD can be used by calling H5Pset_fapl_subfiling() on a + File Access Property List and using that FAPL for file operations. + + (JTH - 2022/07/22) Parallel Library: |