HDF Newsletter 39
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January 7, 1999
CONTENTS
Release of HDF5 version 1.0 Beta for
Windows NT/95
HDF5 Utilities - h5dump and h5toh4
Parallel Release of HDF5 version 1.0.1
We are pleased to announce the first official release of
the parallel implementation of HDF5, version 1.0.1. It uses the
ROMIO version of the MPIO interface for parallel I/O support.
Following are the supported features in this release:
- HDF5 files are accessed according to the communicator and INFO
object defined in the property list set by H5Pset_mpi.
- Independent read and write accesses can be made to fixed and extendible
dimension datasets.
- Collective read and write accesses can be made to fixed dimension datasets.
The parallel HDF5 release distribution is located at:
ftp://ftp.ncsa.uiuc.edu/HDF/HDF5/hdf5-1.0.1/
The web-site for HDF5 is located at:
http://hdf.ncsa.uiuc.edu/HDF5/
Changes Since the Beta Release
- Support for Accessing Extendible Dimension Datasets has been
added.
Extendible dimension datasets must use chunked storage methods.
A new function, H5Dextend, was created to extend the current
dimensions of a dataset. The current release requires the
MPI application to make a collective call to extend the
dimensions of an extendible dataset before writing to the
newly extended area. (The serial HDF5 version does not require
the call to H5Dextend. The dimensions of an extendible
dataset are increased when data is written beyond the
current dimensions but within the maximum dimensions.)
The required collective call of H5Dextend may be relaxed
in a future release.
This release only supports independent read and write accesses
to extendible datasets. Collective accesses to extendible
datasets will be implemented in a future release.
- Collective access to fixed dimension datasets is supported, using
the transfer property list argument of H5Dread and H5Dwrite.
- HDF5 files are opened according to the Communicator and INFO object.
H5Dopen now records the communicator and INFO object set up by
H5Pset_mpi and passes them to the corresponding MPIO open file calls
for processing.
Platforms Supported
This release has been tested on the following platforms:
Intel Red
IBM SP2
SGI Origin 2000
Release of HDF5 version 1.0 Beta for Windows NT/95
A beta version of HDF5 version 1.0 is now available for
Windows NT/95. You can download this from:
ftp://ftp.ncsa.uiuc.edu/HDF/HDF5/hdf5-windows-beta/
HDF5 Utilities - h5dump and h5toh4
Alpha source code is available which contains the h5toh4
and improved h5dump utilities. Binaries for Solaris 2.5 are
also included. The h5dump utility offers a convenient way to dump
the contents of an HDF5 file. The h5toh4 utility enables you to
convert some HDF5 objects into HDF4 objects.
Both utilities are documented in the tools section of the HDF5
Reference Manual, which is included with the alpha source code.
You can download this from:
ftp://ftp.ncsa.uiuc.edu/HDF/HDF5/hdf5-tools-alpha/