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authorMuQun Yang <ymuqun@hdfgroup.org>2006-02-16 16:53:00 (GMT)
committerMuQun Yang <ymuqun@hdfgroup.org>2006-02-16 16:53:00 (GMT)
commiteea537112375c4d2cf39dac3ccc219b099e68ade (patch)
treecf0f212684d9943f1e67eac196479043b40425f7
parenta8a2d5dedb740497fb6319ff8ced524881b887bc (diff)
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[svn-r11943] Purpose:
Added descriptions for the current collective chunk IO supports. Description: Solution: Platforms tested: Misc. update:
-rw-r--r--release_docs/RELEASE.txt32
1 files changed, 32 insertions, 0 deletions
diff --git a/release_docs/RELEASE.txt b/release_docs/RELEASE.txt
index c4fb276..0398e4a 100644
--- a/release_docs/RELEASE.txt
+++ b/release_docs/RELEASE.txt
@@ -64,6 +64,9 @@ New Features
Configuration:
--------------
+ - Added a macro hdf5_mpi_special_collective_io_works to filter out
+ some mpi-io packages that don't support collective IO for no IO
+ contributions in some processes. -KY 2006/2/16
- Added -shlib option to link against installed shared libraries to
h5c++ and h5fc. -JML 2005/11/1
- Added --enable-build-all option to configure, which only developers
@@ -158,6 +161,35 @@ New Features
Library:
--------
+ - Added managements of collective IO supports for chunking storage
+ inside parallel HDF5
+ 1) Implemented One IO with collective mode for all chunks in the
+ application by building one MPI derived datatype accross all
+ chunks.
+ 2) Implemented the decision-making support to do collective IO inside
+ MPI-IO per chunk.
+ 3) Added the decision-making support to do one IO accross all chunks
+ or to do multiple IOs with each IO per chunk.
+ 4) Added the support to handle the case some processes won't do any IOs in
+ collectively.
+ 5) Some MPI-IO package(mpich 1.2.6 or lower, e.g.) cannot handle
+ collective IO correctly for the case when some processes have no
+ contributions to IOs, a special macro is added to change
+ collective IO mode to independent IO mode inside HDF5 library.
+
+ Currently we find that MPICH at Linux and vender MPI-IO package at NCSA
+ Altix cannot handle this case.
+
+ "hdf5_mpi_special_collective_io_works=${hdf5_mpi_special_collective_io_works='no'}"
+ has been added at the end of file <ia64-linux-gnui> and
+ <linux-gnulibc1>.
+
+ If MPI-IO packages at your Linux and Altix support this case,
+ please comment out the last line and report to us at
+ hdfhelp@ncsa.uiuc.edu. We can tune in our configuration to
+ support this.
+
+ KY - 2006/02/16
- Added character encoding to attribute creation property lists.
JML - 2006/01/02
- Added H5Gcopy() routine to copy objects between while keeping