Re: [netcdfgroup] netcdf-mpi build

• To: Constantine Khroulev <c.khroulev@xxxxxxxxx>
• Subject: Re: [netcdfgroup] netcdf-mpi build
• From: Jim Edwards <jedwards@xxxxxxxx>
• Date: Wed, 15 Jan 2014 17:20:19 -0700

Constantine,

It's easy and I think it will work - THANK YOU!

Jim


On Wed, Jan 15, 2014 at 4:24 PM, Constantine Khroulev
<c.khroulev@xxxxxxxxx>wrote:

> Jim,
>
> In the PISM build system (which also uses CMake) I check for the
> presence of netcdf_par.h:
>
>   # Try to find netcdf_par.h. We assume that NetCDF was compiled with
>   # parallel I/O if this header is present.
>   find_file(NETCDF_PAR_H netcdf_par.h HINTS ${NETCDF_INCLUDES}
> NO_DEFAULT_PATH)
>
>   if (NOT NETCDF_PAR_H)
>     set (Pism_USE_PARALLEL_NETCDF4 OFF CACHE BOOL "Enables parallel
> NetCDF-4 I/O." FORCE)
>     message(STATUS "Selected NetCDF library does not support parallel
> I/O.")
>   endif()
>
> I don't know how reliable this is and would love to hear from NetCDF
> developers, but it works so far. (Should work in a cross-compiling
> setup, too, as far as I can tell.)
>
> --
> Constantine
>
> On Wed, Jan 15, 2014 at 2:13 PM, Jim Edwards <jedwards@xxxxxxxx> wrote:
> > Hi,
> >
> > I'm trying to figure out with cmake whether netcdf was built with hdf5
> mpi
> > parallel IO support, I can compile a test program but I cannot expect it
> to
> > run as many of the systems I run on use cross compiling.
> >
> > Variables like NC_MPIIO and NC_COLLECTIVE  appear to be defined even if
> this
> > mode is not available as is the function nc_var_par_access.
> >
> > On some systems I can try linking without mpi and look for the link
> errors,
> > but the compiler wrappers on other systems (eg cray) don't make it easy
> to
> > compile without mpi.
> >
> > Any suggestions?
> >
> >
> > --
> > Jim Edwards
> >
> > CESM Software Engineering Group
> > National Center for Atmospheric Research
> > Boulder, CO
> > 303-497-1842
> >
> > _______________________________________________
> > netcdfgroup mailing list
> > netcdfgroup@xxxxxxxxxxxxxxxx
> > For list information or to unsubscribe,  visit:
> > http://www.unidata.ucar.edu/mailing_lists/
>



-- 
Jim Edwards

CESM Software Engineering Group
National Center for Atmospheric Research
Boulder, CO
303-497-1842

• References:
  • [netcdfgroup] netcdf-mpi build
    • From: Jim Edwards
  • Re: [netcdfgroup] netcdf-mpi build
    • From: Constantine Khroulev