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author | M. Scot Breitenfeld <brtnfld@hdfgroup.org> | 2017-10-26 15:13:33 (GMT) |
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committer | M. Scot Breitenfeld <brtnfld@hdfgroup.org> | 2017-10-26 15:13:33 (GMT) |
commit | 59e7c7703e62717e7bf482bec2bbad52aada3c80 (patch) | |
tree | 59ebe294f77f57850a017ff9596234066d3acebd /release_docs/RELEASE.txt | |
parent | c3aa3978b2873b158a1917f8961c035f413b5e56 (diff) | |
parent | 084704392fa93d1569861c53504e89236468a3b6 (diff) | |
download | hdf5-59e7c7703e62717e7bf482bec2bbad52aada3c80.zip hdf5-59e7c7703e62717e7bf482bec2bbad52aada3c80.tar.gz hdf5-59e7c7703e62717e7bf482bec2bbad52aada3c80.tar.bz2 |
Merge branch 'develop' into hdf5_1_10
Diffstat (limited to 'release_docs/RELEASE.txt')
-rw-r--r-- | release_docs/RELEASE.txt | 40 |
1 files changed, 34 insertions, 6 deletions
diff --git a/release_docs/RELEASE.txt b/release_docs/RELEASE.txt index 709b7b3..4af6b9e 100644 --- a/release_docs/RELEASE.txt +++ b/release_docs/RELEASE.txt @@ -121,6 +121,30 @@ New Features Parallel Library: ----------------- + - Optimize parallel open/location of the HDF5 super-block + + Previous releases of PHDF5 required all parallel ranks to + search for the HDF5 superblock signature when opening the + file. As this is accomplished more or less as a synchronous + operation, a large number of processes can experience a + slowdown in the file open due to filesystem contention. + + As a first step in improving the startup/file-open performance, + we allow MPI rank 0 of the associated MPI communicator to locate + the base offset of the super-block and then broadcast that result + to the remaining ranks in the parallel group. Note that this + approach is utilized ONLY during file opens which employ the MPIO + file driver in HDF5 by previously having called H5Pset_fapl_mpio(). + + HDF5 parallel file operations which do not employ multiple ranks + e.g. specifiying MPI_COMM_SELF (whose MPI_Comm_size == 1) + as opposed to MPI_COMM_WORLD, will not be affected by this + optimization. Conversely, parallel file operations on subgroups + of MPI_COMM_WORLD are allowed to be run in parallel with each + subgroup operating as an independant collection of processes. + + (RAW – 2017/10/10, HDFFV-10294) + - Large MPI-IO transfers Previous releases of PHDF5 would fail when attempting to @@ -143,7 +167,7 @@ New Features fulfill the original user request without encountering API errors. - (RAW – 2017/09/20, HDFFV-8839) + (RAW – 2017/07/11, HDFFV-8839) Fortran Library: ---------------- @@ -201,7 +225,7 @@ Support for new platforms, languages and compilers. ======================================= - -Bug Fixes since HDF5-1.10.0-patch1 release +Bug Fixes since HDF5-1.10.1 release ================================== Library @@ -294,7 +318,6 @@ Bug Fixes since HDF5-1.10.0-patch1 release Too many commands for POST_BUILD step caused command line to be too big on windows. - Changed foreach of copy command to use a custom command with the use of the HDFTEST_COPY_FILE macro. @@ -457,15 +480,20 @@ Supported Platforms Windows 7 Visual Studio 2012 w/ Intel Fortran 15 (cmake) Visual Studio 2013 w/ Intel Fortran 15 (cmake) Visual Studio 2015 w/ Intel Fortran 16 (cmake) - Cygwin(CYGWIN_NT-6.1 2.2.1(0.289/5/3) gcc(4.9.3) compiler and gfortran) - (cmake and autotools) Windows 7 x64 Visual Studio 2012 w/ Intel Fortran 15 (cmake) Visual Studio 2013 w/ Intel Fortran 15 (cmake) Visual Studio 2015 w/ Intel Fortran 16 (cmake) - Visual Studio 2015 w/ Intel Parallel Studio 2017 (cmake) + Visual Studio 2015 w/ Intel C, Fortran 2017 (cmake) + Visual Studio 2015 w/ MSMPI 8 (cmake) + Cygwin(CYGWIN_NT-6.1 2.8.0(0.309/5/3) + gcc and gfortran compilers (GCC 5.4.0) + (cmake and autotools) Windows 10 Visual Studio 2015 w/ Intel Fortran 16 (cmake) + Cygwin(CYGWIN_NT-6.1 2.8.0(0.309/5/3) + gcc and gfortran compilers (GCC 5.4.0) + (cmake and autotools) Windows 10 x64 Visual Studio 2015 w/ Intel Fortran 16 (cmake) |