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HDF5 version 1.8.3-snap13 currently under development
================================================================================

INTRODUCTION
============

This document describes the differences between HDF5-1.8.3 and 
HDF5 1.8.3-*, and contains information on the platforms tested and 
known problems in HDF5-1.8.3-*. 
For more details, see the files HISTORY-1_0-1_8_0_rc3.txt 
and HISTORY-1_8.txt in the release_docs/ directory of the HDF5 source.

Links to the HDF5 1.8.3 source code, documentation, and additional materials
can be found on the HDF5 web page at:

     http://www.hdfgroup.org/products/hdf5/

The HDF5 1.8.3 release can be obtained from:

     http://www.hdfgroup.org/HDF5/release/obtain5.html

User documentation for 1.8.3 can be accessed directly at this location: 

     http://www.hdfgroup.org/HDF5/doc/

New features in the HDF5-1.8.x release series, including brief general 
descriptions of some new and modified APIs, are described in the "What's New 
in 1.8.0?" document:

     http://www.hdfgroup.org/HDF5/doc/ADGuide/WhatsNew180.html

All new and modified APIs are listed in detail in the "HDF5 Software Changes 
from Release to Release" document, in the section "Release 1.8.3 (current 
release) versus Release 1.8.2":

     http://www.hdfgroup.org/HDF5/doc/ADGuide/Changes.html

If you have any questions or comments, please send them to the HDF Help Desk:

     help@hdfgroup.org


CONTENTS
========

- New Features
- Support for New Platforms, Languages, and Compilers
- Bug Fixes since HDF5-1.8.3
- Platforms Tested
- Supported Configuration Features Summary
- Known Problems


New Features
============

    Configuration
    -------------
    - Configuration suite now uses Automake 1.11 and Autoconf 2.64.
      MAM 2009/08/31.
    - Changed default Gnu fortran compiler from g95 to gfortran since
      gfortran is more likely installed with gcc now. -AKC 2009/07/19- 

    Library
    -------
    - The embedded library information is displayed by H5check_version() if a
      version mismatch is detected.  Also changed H5check_version() to
      suppress the warning message totally if $HDF5_DISABLE_VERSION_CHECK is 2
      or higher. (Old behavior treated 3 or higher the same as 1, that is
      print a warning and allows the program to continue. (AKC - 2009/9/28)
    - If a user does not care for the extra library information insert
      in the executables, he may turn it off by --disable-embedded-libinfo
      during configure. (AKC - 2009/9/15)

    Parallel Library
    ----------------
    - None
 
    Tools
    -----
    - None

    High-Level APIs
    ---------------
    - None

    F90 API
    -------
    - None

    C++ API
    -------
    - None


Support for New Platforms, Languages, and Compilers
===================================================
    - PathScale compilers are recognized and can build the HDF5 library
      properly. AKC - 2009/7/28 -


Bug Fixes since HDF5-1.8.3
==========================

    Configuration
    -------------
    - Added $(EXEEXT) extension to H5detect when it's executed in the
      src/Makefile to generate H5Tinit.c so it works correctly on platforms 
      that require the full extension when running executables.
      MAM - 2009/10/01 - BZ #1613
    - Configure will now set FC and CXX to "no" when fortran and c++
      are not being compiled, respectively, so configure will not run
      some of the compiler tests for these languages when they are not 
      being used. MAM - 2009/10/01
    - The --enable-static-exec flag has been fixed and will now install
      statically-linked executables within the install directory when used
      on systems that support the -static linker flag.
      MAM - 2009/08/31 - BZ #1583
    - The PathScale compiler (v3.2) was mistaken as gcc v4.2.0 but it fails to
      recognize some gcc options. Fixed. (see bug 1301). AKC - 2009/7/28 -

    Library
    -------
    - Fixed incorrect return value for H5Pget_filter_by_id1/2 in H5Ppublic.h.
      NAF - 2009/09/25 - 1620
    - Fixed a bug where properties weren't being compared with the registered
      compare callback. NAF - 2009/09/25 - 1555
    - Corrected problem where library would re-write the superblock in a file
      opened for R/W access, even when no changes were made to the file.
      (QAK - 2009/08/20, Bz#1473)
    - Fixed a bug where H5Pget_filter_by_id would succeed when called for a
      filter that wasn't present. NAF - 2009/06/25 - 1250
    - Fixed an issue with committed compound datatypes containing a vlen. Also
      fixed memory leaks involving committed datatypes. NAF - 2009/06/10 - 1593

    Parallel Library
    ----------------
    - None

    Tools
    -----
    - h5dump/h5ls display buffer resize fixed in tools library.
      ADB - 2009/7/21 - 1520
    - perf_serial test added to Windows projects and check batch file. 
      ADB - 2009/06/11 -1504


    F90 API
    ------
    - None

    C++ API
    ------
    - None

    High-Level APIs:
    ------
    - H5DSis_attached failed to account for different platform types. Added a
      get native type call. ADB - 2009/9/29 - 1562

    Fortran High-Level APIs:
    ------
    - Lite: the h5ltread_dataset_string_f and h5ltget_attribute_string_f functions 
           had memory problems with the g95 fortran compiler. (PVN � 5/13/2009) 1522



Platforms Tested
================
The following platforms and compilers have been tested for this release.

    AIX 5.3                       xlc 7.0.0.8
    (LLNL Up)                     xlf 09.01.0000.0008
                                  xlC 7.0.0.8
                                  mpcc_r 7.0.0.8
                                  mpxlf_r 09.01.0000.0008

    Cray XT3 (2.0.41)             cc (pgcc) 7.1-4
    (SNL red storm)               ftn (pgf90) 7.1-4
                                  CC (pgCC) 7.1-4

    FreeBSD 6.3-STABLE i386       gcc 3.4.6 [FreeBSD] 20060305
    (duty)                        g++ 3.4.6 [FreeBSD] 20060305
                                  gcc 4.3.4 20090419
                                  g++ 4.3.4 20090419
                                  gfortran 4.3.4 20090419

    FreeBSD 6.3-STABLE amd64      gcc 3.4.6 [FreeBSD] 20060305
    (liberty)                     g++ 3.4.6 [FreeBSD] 20060305
                                  gcc 4.4.1 20090421
                                  g++ 4.4.1 20090421
                                  gfortran 4.4.1 20090421

    IRIX64 6.5 (64 & n32)         MIPSpro cc 7.4.4m
                                  F90 MIPSpro 7.4.4m 
                                  C++ MIPSpro cc 7.4.4m

    Linux 2.6.18-128.1.6.el5xen   gcc (GCC) 4.1.2
    #1 SMP i686 i686 i386         G95 (GCC 4.0.3 (g95 0.92!) Feb 4 2009)
    (jam)                         PGI C, Fortran, C++ 7.2-1 32-bit
                                  PGI C, Fortran, C++ 8.0-1 32-bit
                                  Intel(R) C Compiler for 32-bit
                                      applications, Versions 10.1, 11.0
                                  Intel(R) C++ Compiler for 32-bit
                                      applications, Version 10.1, 11.0
                                  Intel(R) Fortran Compiler for 32-bit
                                      applications, Version 10.1, 11.0
                                  Absoft 32-bit Fortran 95 10.0.7
                                  MPICH mpich2-1.0.8 compiled with
                                  gcc 4.1.2 and G95  (GCC 4.0.3 (g95 0.92!)

    Linux 2.6.9-42.0.10.ELsmp #1  gcc (GCC) 3.4.6
    SMP i686 i686 i386            G95 (GCC 4.0.3 (g95 0.92!) Feb 4 2009)
    (kagiso)                      MPICH mpich2-1.0.8 compiled with
                                  gcc 3.4.6 and G95  (GCC 4.0.3 (g95 0.92!)

    Linux 2.6.16.60-0.37-smp #1   gcc 4.1.2
    SMP x86_64 GNU/Linux          G95 (GCC 4.0.3 (g95 0.92!) Feb 4 2009)
    (smirom)                      Intel(R) C, C++, Fortran Compilers for 
                                  applications running on Intel(R) 64, 
                                  Versions 10.1, 11.0.
                                  PGI C, Fortran, C++ Version 7.2-1, 8.0-1
                                         for 64-bit target on x86-64
                                  gcc 4.1.2 and G95  (GCC 4.0.3 (g95 0.92!)
                                  MPICH mpich2-1.0.8 compiled with
                                  gcc 4.1.2 and G95 (GCC 4.0.3 (g95 0.92!)
                                  tested for both 32- and 64-bit binaries

    Linux 2.6.16.54-0.2.5 #1      Intel(R) C++ Version 10.1.017
    SGI Altix SMP ia64            Intel(R) Fortran Itanium(R) Version 10.1.017
    (cobalt)                      SGI MPI 1.38

    SunOS 5.10 32- and 64-bit     Sun WorkShop 6 update 2 C 5.9 Patch 124867-09
    (linew)                       Sun WorkShop 6 update 2 Fortran 95 8.3 
                                  Patch 127000-07
                                  Sun WorkShop 6 update 2 C++ 5.8 
                                  Patch 124863-11

    Intel Xeon Linux 2.6.18-      gcc 3.4.6 20060404
    92.1.10.el5_lustre.1.6.6smp-  Intel(R) C++ Version 10.0.026
    perfctr #2 SMP                Intel(R) Fortran Compiler Version 10.0.026
    (abe)                         Open MPI 1.2.2
                                  MVAPICH2-0.9.8p28p2patched-intel-ofed-1.2
                                  compiled with icc v10.0.026 and ifort 10.0.026

    IA-64 Linux 2.4.21-309.tg1    gcc (GCC) 3.2.2
    #1 SMP ia64                   Intel(R) C++ Version 8.1.037
    (NCSA tg-login)               Intel(R) Fortran Compiler Version 8.1.033
                                  mpich-gm-1.2.7p1..16-intel-8.1.037-r1

    Linux 2.6.9-55.0.9.EL_lustre  Intel(R) C, C++, Fortran Compilers for 
    .1.4.11.1smp #1 SMP           applications running on Intel(R) 64, 
    SMP x86_64 GNU/Linux          Versions 9.1.
    (SNL Spirit)             
                                  
    Linux 2.6.9-55.0.9.EL_lustre  Intel(R) C, C++, Fortran Compilers for 
    .1.4.11.1smp #1 SMP           applications running on Intel(R) 64, 
    SMP x86_64 GNU/Linux          Versions 10.1.
    (SNL Thunderbird)             
                                  
    Linux 2.6.18-63chaos #1 SMP   Intel(R) C, C++, Fortran Compilers for 
    SMP x86_64 GNU/Linux          applications running on Intel(R) 64, 
    (SNL Glory)                   Versions 10.1.
    
    Linux 2.6.18-63chaos #1 SMP   Intel(R) C, C++, Fortran Compilers for 
    SMP x86_64 GNU/Linux          applications running on Intel(R) 64, 
    (LLNL Zeus)                   Versions 9.1.
				  gcc/gfortran/g++ (GCC) 4.1.2.

    Windows XP                    Visual Studio .NET
                                  Visual Studio 2005 w/ Intel Fortran 9.1
                                  Cygwin(native gcc compiler and g95)

    Windows XP x64                Visual Studio 2005 w/ Intel Fortran 9.1

    Windows Vista                 Visual Studio 2005

    MAC OS  10.5.6 (Intel)        i686-apple-darwin9-gcc-4.0.1 (GCC) 4.0.1
                                  GNU Fortran (GCC) 4.3.0 20070810
                                  G95 (GCC 4.0.3 (g95 0.91!) Apr 24 2008)
                                  Intel C, C++ and Fortran compilers 10.1


Supported Configuration Features Summary
========================================

    In the tables below
          y   = tested and supported
          n   = not supported or not tested in this release
          C   = Cluster
          W   = Workstation
          x   = not working in this release
          dna = does not apply
          ( ) = footnote appears below second table
          <blank> = testing incomplete on this feature or platform 

Platform                           C        F90    F90      C++   zlib  SZIP
                                   parallel        parallel
Solaris2.10 32-bit                   n        y      n        y     y     y
Solaris2.10 64-bit                   n        y      n        y     y     y
IRIX64_6.5 32-bit                    n        n      n        n     y     y
IRIX64_6.5 64-bit                    n        y      y        y     y     y
Windows XP                           n        y(4)   n(4)     y     y     y
Windows XP x64                       n        y(4)   n(4)     y     y     y
Windows Vista                        n        n      n        y     y     y
Mac OS X 10.5 Intel                  n        y      n        y     y     y
AIX 5.3 32- and 64-bit               n        y      n        y     y     n
FreeBSD 6.3-STABLE 32&64 bit         n        y      n        y     y     y
RedHat EL4 2.6.9-42 i686 GNU (1)  W  y        y      y        y     y     y
RedHat EL5 2.6.18-128 i686 GNU (1)W  y        y(2)   y        y     y     y
RedHat EL5 2.6.18-128 i686 Intel  W  n        y      n        y     y     n
RedHat EL5 2.6.18-128 i686 PGI    W  n        y      n        y     y     n
SuSe Linux 2.6.16 x86_64 GNU (1)  W  y        y(3)   y        y     y     y
SuSe Linux 2.6.16 x86_64 Intel    W  n        y      n        y     y     n
SuSe Linux 2.6.16 x86_64 PGI      W  n        y      n        y     y     y
SuSe Linux 2.6.16 SGI Altix ia64  C  y        y      y        y     y     y
RedHat EL4 2.6.18 Xeon Lustre     C  y        y      y        y     y     n
SuSe Linux 2.4.21 ia64 Intel      C  y        y      y        y     y     n
Cray XT3 2.0.41                      y        y      y        y     y     n


Platform                           Shared  Shared    Shared    Thread-  
                                   C libs  F90 libs  C++ libs  safe     
Solaris2.10 32-bit                   y       y         y         y        
Solaris2.10 64-bit                   y       y         y         y        
IRIX64_6.5 32-bit                    y       dna       y         y        
IRIX64_6.5 64-bit                    y       y         n         y        
Windows XP                           y       y(4)      y         y        
Windows XP x64                       y       y(4)      y         y        
Windows Vista                        y       n         n         y        
Mac OS X 10.5                        y       n         y         n        
AIX 5.3 32- and 64-bit               n       n         n         n        
FreeBSD 6.3-STABLE 32&64 bit         y       n         y         y        
RedHat EL4 2.6.9-42 i686 GNU (1)  W  y       y         y         y        
RedHat EL5 2.6.18-128 i686 GNU (1)W  y       y(2)      y         y        
RedHat EL5  2.6.18-128 i686 Intel W  y       y         y         n        
RedHat EL5 2.6.18-128 i686 PGI    W  y       y         y         n        
SuSe Linux 2.6.16 x86_64 GNU (1)  W  y       y         y         y        
SuSe Linux 2.6.16 x86_64 Intel    W  y       y         y         n        
SuSe Linux 2.6.16 x86_64 PGI      W  y       y         y         n        
SuSe Linux 2.6.16 SGI Altix ia64  C  y                           n        
RedHat EL4 2.6.18 Xeon Lustre     C  y       y         y         n
SuSe Linux 2.4.21 ia64 Intel      C  y       y         y         n        
Cray XT3 2.0.41                      n       n         n         n

           (1) Fortran compiled with g95.
           (2) With PGI and Absoft compilers.
           (3) With PGI compiler for Fortran.
           (4) Using Visual Studio 2005 or Cygwin
    Compiler versions for each platform are listed in the preceding
    "Platforms Tested" table.


Known Problems
==============
* The PathScale MPI implementation, accessing a Panasas file system, would
  cause H5Fcreate() with H5F_ACC_EXCL to fail even when the file is not
  existing. This is due to the MPI_File_open() call failing if the amode has
  the MPI_MODE_EXCL bit set. (See bug 1468 for details.) AKC - 2009/8/11
 
* Parallel tests failed with 16 processes with data inconsistency at testphdf5
  / dataset_readAll. Parallel tests also failed with 32 and 64 processes with
  collective abort of all ranks at t_posix_compliant / allwrite_allread_blocks
  with MPI IO. CMC - 2009/04/28

* There is a known issue in which HDF5 will change the timestamp on a file 
  simply by opening it with read/write permissions, even if the file is not
  modified in any way. This is due to the way in which HDF5 manages the file 
  superblock. A fix is currently underway and should be included in the 1.8.4
  release of HDF5. MAM - 2009/04/28

* For gcc v4.3 and v4.4, with production mode, if -O3 is used, H5Tinit.c
  would fail to compile. Actually bad H5Tinit.c is produced.  If -O (same
  as -O1) is used, H5Tinit.c compiled okay but test/dt_arith would fail.
  When -O0 (no optimizatio) is used, H5Tinit.c compilete okay and all
  tests passed. Therefore, -O0 is imposed for v4.3 and v4.4 of gcc.
  AKC - 2009/04/20

* For Red Storm, a Cray XT3 system, the tools/h5ls/testh5ls.sh and
  tools/h5copy/testh5copy.sh will fail some of its sub-tests. These sub-tests
  are expected to fail and should exit with a non-zero code but the yod
  command does not propagate the exit code of the executables. Yod always
  returns 0 if it can launch the executable.  The test suite shell expects
  a non-zero for this particular test, therefore it concludes the test has
  failed when it receives 0 from yod.  Skip all the "failing" test for now
  by changing them as following.

  ======== Original tools/h5ls/testh5ls.sh =========
  TOOLTEST tgroup-1.ls 1 -w80 -r -g tgroup.h5
  ======== Change to ===============================
  echo SKIP TOOLTEST tgroup-1.ls 1 -w80 -r -g tgroup.h5
  ==================================================

  ======== Original tools/h5copy/testh5copy.sh =========
  TOOLTEST_FAIL -i $TESTFILE -o $FILEOUT -v -s grp_dsets  -d grp_rename
  TOOLTEST_FAIL -i $TESTFILE -o $FILEOUT -v -s grp_dsets  -d /grp_rename/grp_dsets
  TOOLTEST_FAIL -i $TESTFILE -o $FILEOUT -vp -s /grp_dsets -d /E/F/grp_dsets
  TOOLTEST_FAIL -i $TESTFILE -o $FILEOUT -vp -s /grp_nested -d /G/H/grp_nested
  H5LSTEST $FILEOUT
  ======== Change to ===============================
  echo SKIP TOOLTEST_FAIL -i $TESTFILE -o $FILEOUT -v -s grp_dsets  -d grp_rename
  echo SKIP TOOLTEST_FAIL -i $TESTFILE -o $FILEOUT -v -s grp_dsets  -d /grp_rename/grp_dsets
  echo SKIP TOOLTEST_FAIL -i $TESTFILE -o $FILEOUT -vp -s /grp_dsets -d /E/F/grp_dsets
  echo SKIP TOOLTEST_FAIL -i $TESTFILE -o $FILEOUT -vp -s /grp_nested -d /G/H/grp_nested
  echo SKIP H5LSTEST $FILEOUT
  ==================================================
  AKC - 2008/11/10

* For Red Storm, a Cray XT3 system, the yod command sometimes gives the
  message,  "yod allocation delayed for node recovery".  This interferes with
  test suites that do not expect seeing this message.  See the section of "Red
  Storm" in file INSTALL_parallel for a way to deal with this problem.
  AKC - 2008/05/28

* We have discovered two problems when running collective IO parallel HDF5 
  tests with chunking storage on the ChaMPIon MPI compiler on tungsten, a 
  Linux cluster at NCSA.

  Under some complex selection cases: 
  1) MPI_Get_element returns the wrong value.
  2) MPI_Type_struct also generates the wrong derived datatype and corrupt 
     data may be generated.
  These issues arise only when turning on collective IO with chunking storage 
  with some complex selections. We have not found these problems on other 
  MPI-IO compilers. If you encounter these problems, you may use independent 
  IO instead.

  To avoid this behavior, change the following line in your code
      H5Pset_dxpl_mpio(xfer_plist, H5FD_MPIO_COLLECTIVE);
  to
      H5Pset_dxpl_mpio(xfer_plist, H5FD_MPIO_INDEPENDENT);
  KY - 2007/08/24

* On Intel 64 Linux cluster (RH 4, Linux 2.6.9) with Intel 10.0 compilers, 
  use -mp -O1 compilation flags to build the libraries. A higher level of 
  optimization causes failures in several HDF5 library tests. 

* For LLNL, uP: both serial and parallel tests pass.  
  Zeus: Serial tests pass but parallel tests fail with a known problem in MPI.
  ubgl: Serial tests pass but parallel tests fail. 

* On mpich 1.2.5 and 1.2.6, if more than two processes contribute no IO and 
  the application asks to do collective IO, we have found that when using 4 
  processors, a simple collective write will sometimes be hung. This can be 
  verified with t_mpi test under testpar.

* On IRIX6.5, when the C compiler version is greater than 7.4, complicated
  MPI derived datatype code will work. However, the user should increase
  the value of the MPI_TYPE_MAX environment variable to some appropriate value 
  to use collective irregular selection code.  For example, the current 
  parallel HDF5 test needs to raise MPI_TYPE_MAX to 200,000 to pass the test. 

* A dataset created or rewritten with a v1.6.3 library or after cannot be read 
  with the v1.6.2 library or before when the Fletcher32 EDC filter is enabled.
  There was a bug in the calculation of the Fletcher32 checksum in the 
  library before v1.6.3; the checksum value was not consistent between big-
  endian and little-endian systems.  This bug was fixed in Release 1.6.3.  
  However, after fixing the bug, the checksum value was no longer the same as 
  before on little-endian system.  Library releases after 1.6.4 can still read 
  datasets created or rewritten with an HDF5 library of v1.6.2 or before.  
  SLU - 2005/6/30

* On IBM AIX systems, parallel HDF5 mode will fail some tests with error
  messages like "INFO: 0031-XXX ...".  This is from the command `poe'.
  Set the environment variable MP_INFOLEVEL to 0 to minimize the messages
  and run the tests again.

  The tests may fail with messages like "The socket name is already in use",  
  but HDF5 does not use sockets.  This failure is due to problems with the 
  poe command trying to set up the debug socket.  To resolve this problem, 
  check to see whether there are many old /tmp/s.pedb.* files staying around.  
  These are sockets used by the poe command and left behind due to failed 
  commands.  First, ask your system administrator to clean them out.  
  Lastly, request IBM to provide a means to run poe without the debug socket.

* The --enable-static-exec configure flag fails to compile for Solaris
  platforms. This is due to the fact that not all of the system libraries on 
  Solaris are available in a static format.

  The --enable-static-exec configure flag also fails to correctly compile
  on IBM SP2 platforms for serial mode. The parallel mode works fine with 
  this option.
  
  It is suggested that you do not use this option on these platforms
  during configuration.

* There is also a configure error on Altix machines that incorrectly reports 
  when a version of Szip without an encoder is being used.

* Information about building with PGI and Intel compilers is available in
  the INSTALL file sections 4.7 and 4.8.