The PIO team is pleased to release version 2.4.1 of the PIO library. This
release includes performance improvements, bug fixes, and more tests. Get
the latest release from the PIO GitHub site:
https://github.com/NCAR/ParallelIO.
What is PIO?
The Parallel IO library (PIO) is a high-level parallel I/O C/Fortran
library for structured grid applications. 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/
New This ReleasePerformance Improvements
This release contains the following performance improvements:
- Linked list were replaced with hashtables for improved performance
scaling.
- The sorting algorithm for out of order dofs was replaced with qsort.
Bug fixes
- Fixed over-sensitive testing of error messages in test_pioc. This
tests have been made less sensitive so that they work with all recent
versions of netCDF and parallel-netcdf.
More Tests
With this release we being using travis/GitHub for additional continuous
integration testing, adding to our existing CI systems.
Required Libraries
We recommend always using the latest releases of netCDF and pnetcdf.
This release requires:
- netcdf-4.6.0 or newer.
- 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 is required.
Previous versions of HDF5 have a bug in parallel collective I/O which is
triggered by a PIO unit test.
