The PIO team is pleased to release version 2.5.3 of the PIO library. This
release includes enhanced netCDF integration, new API functions,
documentation improvements, bug fixes, and more tests. Get the latest
release from:
https://github.com/NCAR/ParallelIO/releases/download/pio2_5_3/pio-2.5.3.tar.gz
See https://ncar.github.io/ParallelIO/ for documentation.
What is PIO?
The Parallel IO libraries (PIO) are high-level parallel I/O C and Fortran
libraries for applications that need to do netCDF I/O from large numbers of
processors on a HPC system.
PIO provides a netCDF-like API, and allows users to designate some subset
of processors to perform IO. Computational code calls netCDF-like functions
to read and write data, and PIO uses the IO processors to perform all
necessary IO.
PIO also supports the creation of multiple computation components, each
containing many processors, and one shared set of IO processors. The
computational components can perform write operation asynchronously, and
the IO processors will take care of all storage interaction.
See the PIO web site for more information: http://ncar.github.io/ParallelIO/
.
Our PIO paper for the 2021 AMS meeting is here:
https://www.researchgate.net/publication/348169990_THE_PARALLELIO_PIO_CFORTRAN_LIBRARIES_FOR_SCALABLE_HPC_PERFORMANCE
.
New This Release
- Fortran API for async interface (see #241
<https://github.com/NCAR/ParallelIO/issues/241>).
- Better async initialization (see #806
<https://github.com/NCAR/ParallelIO/issues/806>).
- Fixed memory errors in async mode (see #1846
<https://github.com/NCAR/ParallelIO/issues/1846>, #1847
<https://github.com/NCAR/ParallelIO/issues/1847>, #1267
<https://github.com/NCAR/ParallelIO/issues/1267>, #1830
<https://github.com/NCAR/ParallelIO/issues/1830>)
- Removed unneeded dependency on netcdf-fortran (see #315
<https://github.com/NCAR/ParallelIO/issues/315>)
- Fixed build problems and code warnings with netCDF integration (see
#1829 <https://github.com/NCAR/ParallelIO/issues/1829>, #1838
<https://github.com/NCAR/ParallelIO/issues/1838>, #1845
<https://github.com/NCAR/ParallelIO/issues/1845>)
- More testing (see #1822
<https://github.com/NCAR/ParallelIO/issues/1822>, #1756
<https://github.com/NCAR/ParallelIO/issues/1756>, #1827
<https://github.com/NCAR/ParallelIO/issues/1827>, #1678
<https://github.com/NCAR/ParallelIO/issues/1678>, #1372
<https://github.com/NCAR/ParallelIO/issues/1372>).
Required Libraries
We recommend always using the latest releases of netCDF and pnetcdf.
This release requires:
- netcdf-4.6.1 or newer. 4.7.3 or newer is required if
--enable-netcdf-integration is used.
- pnetcdf-1.9.0 or newer (unless PIO is built without pnetcdf support).
- If netCDF is built with HDF5 support, then HDF5-1.10.4 or newer is
required. Previous versions of HDF5 have a bug in parallel collective I/O
which is triggered by a PIO unit test.
