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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
Howdy all!
The Unidata NetCDF group is pleased to announce the 4.1.2 release of
the netCDF C/Fortran libraries. This release contains bug fixes and
internal refactoring.
(Users of parallel I/O with netCDF-4 please note: starting with the 4.1.2
release the parallel I/O functions are prototyped in netcdf_par.h, not
netcdf.h. You must include netcdf_par.h BEFORE netcdf.h to use parallel
I/O with netCDF-4.)
This release contains the following:
* Rewrite netCDF-4 attribute put code for a large speedup when
writing lots of attributes.
* Fix nc-config --libs when static dependent libraries are not
installed in the same directory as netCDF libraries (thanks to
Jeff Whitaker).
* Build shared libraries by default, requiring separate Fortran
library. Static libraries now built only with --disable-shared.
* Refactor of HDF5 file metadata scan for large speedup in opening
files, especially large files.
* Complete rewrite of the handling of character datalist
constants. The heuristics are documented in ncgen.1.
* Eliminate use of NC_MAX_DIMS and NC_MAX_VARS in ncdump and nccopy,
allocating memory as needed and reducing their memory footprint.
* Add documentation for new nc_inq_path() function.
* Use hashing to speedup lookups by name for files with lots of
dimensions and variables (thanks to Greg Sjaardema).
* Add options to nccopy to support uniform compression of variables
in output, shuffling, and fixing unlimited dimensions. Add option
to support specifying chunking in output in terms of dimension
names.
* Modified opendap constraint parser to be more compatible with a
java version of the parser.
* Modified ncgen to utilize iterators internally; should be no user
visible effect.
* An internal refactoring of the C library allows for easier
maintainance and extension of the netCDF library. This
restructuring of the library code is invisible to the
end-user. Two new directories have been added to the netCDF build:
libdispatch, which decides whether to call a netcdf classic,
netcdf-4, or opendap version of each function in the API, and
liblib, where, depending on the configure choices, the final
netCDF library is assembled from convenience libraries created in
other directories.
* Fix for make bug which caused documentation to be unnecessarily
rebuilt after make clean.
* Fix for bug in accessing a multidimensional variable with more
than 4 billion values on a 32-bit platform.
* Fix for memory performance problems in parallel I/O. The automatic
use of HDF5 buffers in parallel programs with netCDF-4 resulted in
large memory use.
* Fix netCDF-4 bug caused when doing enddef/redef and then defining
coordinate variable out of order.
* Refactoring of netCDF-4 internals to reduce memory use and end
dependence on size of NC_MAX_DIMS and NC_MAX_NAME.
* Fix "ncdump -c" bug identifying coordinate variables in groups.
* Fix bug in libsrc/posixio.c when providing sizehint larger than
default, which then doesn't get used (thanks to Harald Anlauf).
* The netCDF C/Fortran/C++ source code has been moved to Unidata's
subversion server. Interested users can now examine the netCDF
code in its full glory and gory internals at
http://svn.unidata.ucar.edu/netcdf.
* Documentation improvements, especially relating to creating
netCDF-4 compatible files with HDF5 only.
The 4.1.2 release source code is available from the following
URL. ftp://ftp.unidata.ucar.edu/pub/netcdf/netcdf-4.1.2.tar.gz or
ftp://ftp.unidata.ucar.edu/pub/netcdf/netcdf-4.1.2.tar.Z
Build it according to these instructions:
http://www.unidata.ucar.edu/software/netcdf/docs/netcdf-install.html#Quick-Instructions
Report problems to the support email address:
support-netcdf@xxxxxxxxxxxxxxxx
Thanks!
Ed
--
Ed Hartnett -- ed@xxxxxxxxxxxxxxxx
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