Recently Completed Work:

  • Refining of prototype implementation of PIO in POP. [Dennis]
  1. - Added support for writing of 'holes'.
  • Partial simplification of the initDecomp interface. Remove the need to have displace arrays in the interface and added dims array. About half way to eventual goal. [Dennis]
  • Phase I rearrangement of directory structure [Loy]
  • Rearrangement of directory structure and improvement of build procedure. [Loy]

Ongoing Work:

  1. -
  • Evaluate extensibility of PIO interface [Vertenstein, Craig, Eaton, Worley, Edwards]
  • Debugging of the MCT +
    Unknown macro: {binary files,pNetCDF}
    files. This problem only appears to occur for a small number of IO processes on BGL (<32) [Loy, Dennis]
  • Debugging of
    Unknown macro: {binary, pNetCDF}
    files. This problem only appears to occur for a small number of IO processes on BGL (<32) [Dennis]
  • Support for use of serial netCDF calls. Use MCT rearranger to redistribute data to a single processor. Disk I/O is subsequently performed by calling the serial netCDF interface. [Loy]
  • Support for use of serial binary calls. Use MCT rearranger to redistribute data to a single processor. Disk I/O is subsequently performed by calling a FORTRAN read or write.[Loy]
  • Improve support for 1D and 3D arrays in PIO. Create a test code that exercises 1D and 3D array writes. [ Dennis

Additional Work:

  1. -
  • Need to simplify the interface to PIO_initDecomp. This could probably be done by using a single global segmap or GDOF approach. Code within PIO_initDecomp could subsequently translate decomposition information for use by MPI data structures or pNetCDF.
  • Add support for broadcasting of output arguments for I/O performed on subset of processors.
  • Improved support for binary I/O
  1. - Support for sequential binary
  2. - addition of record numbers for direct binary
  • Improve parallel performance. Possibly through the use of MPI-IO hints, or careful use of MCT and layouts.
  • More extensive testing is need. Currently it has only been lightly tested on BGL and AIX5.
  • Support for calling of PIO from non-MPI environment.
  • General restructuring of the PIO internals. Need to modify code such that it can be easily compiled without pNetCDF, or without MPI-IO, etc...
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