MPAS-A, PIO2 & PNetCDF

[Carl Ponder]

I'm (going to be) using MPAS-A with PIO2.
I've been building PIO with PNetCDF, but our file system may not be able to support PNetCDF correctly.
PIO has this flag to build without PNetCDF

-DWITH_PNETCDF=FALSE

When I use this, does it only affect the PIO performance, or does it disable pieces of the interface as well?
And are we required to use PIO+PNetCDF with MPAS-A, or can we use the PIO without it?

Just for some background, when I use the above setting I get the message from the PIO build

CMake Warning at CMakeLists.txt:50 (MESSAGE):
  Warning: Not building with PNetcdf - cannot run all regression tests.

which, in my mind, suggests that some of the PIO capabilities aren't working.
Or would the regression-tests be skipped only because their performance wouldn't be interesting?
Thanks,

                    Carl Ponder

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[Jim Edwards]

You can build and run without pnetcdf, it does not change the interfaces.   netcdf4p is still available for

parallel output but it is pretty slow - it may even be slower than the serial netcdf method.  

The regression tests loop over all io possibilities (serial, pnetcdf, netcdf4p, netcdf4c) and if any are not configured you will get this warning about

tests being skipped.    

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Jim Edwards

CESM Software Engineer

National Center for Atmospheric Research

Boulder, CO

[Dominikus Heinzeller]

Hi Jim,

I think you should be able to run MPAS-A using PIO without pnetcdf. MPAS makes use of the PIO interface, not of the individual interfaces to netcdf/pnetcdf/etc.

Since pnetcdf is the default io_type (see user’s guide http://www2.mmm.ucar.edu/projects/mpas/mpas_atmosphere_users_guide_5.2.pdf page 16/17), you will have to explicitly set it to (serial) “netcdf" or “netcdf4”.

Cheers,

Dom

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[Jim Edwards]

Hi Dom,

Thanks - I think that's what I was trying to say.

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