Hi Ted
The parallel I/O of NetCDF 4.6.0 has been revised quite a lot. Constants
NC_MPIIO, NC_PNETCDF, and NC_MPIPOSIX are deprecated in 4.6.0.
Because parallel I/O in NetCDF must be done by calling nc_create_par
or nc_open_par, these 3 constants become redundant.
When calling nc_create_par, the format of file to be created is determined
by flags NC_NETCDF4, NC_CLASSIC_MODEL, NC_64BIT_OFFSET, and NC_64BIT_DATA.
The former two are for HDF5-based files and latter two are classic-based.
For nc_open_par, NetCDF checks the file signature which decides either
to call the HDF5 driver or PnetCDF drivers underneath to carry out the
parallel I/O.
I guess the next release of NetCDF-Fortran will be updated to reflect
the above changes in C.
FYI.
command-line "nc-config --version” and "nf-config --version” print the
library version number. So are APIs nf90_inq_libvers and nf_inq_libvers.
Wei-keng
> On Jan 31, 2019, at 6:27 PM, Ted Mansell <ted.mansell@xxxxxxxx> wrote:
>
> Hi,
>
> I have been using older versions of netcdf for a long time (4.3.1.1) and just
> recently tried out 4.6.0. I sometimes use pnetcdf for writing, in which case
> I used the convenient netcdf-4 interface to define the files like so:
>
> cmode = ior(ior(NF90_PNETCDF,NF90_MPIIO),nf90_64bit_offset)
> status = nf90_create(filename(ibeg:iend), cmode, ncid, comm = my_comm,
> info = my_info)
>
> With 4.6.0, the NF90_PNETCDF causes an error, but it works if I remove that
> flag:
> cmode = ior(NF90_MPIIO,nf90_64bit_offset)
>
> But that doesn't work with the older netcdf. Is there a way to check which
> version of netcdf I'm compiling against so that I can adapt the mode
> appropriately? I've been testing out ideas with the f90tst_parallel.f90, but
> can't seem to get both versions to work with the same code. I'm too lazy to
> write a separate code to create and define my file with pure pnetcdf....
>
> Thanks for any hints.
>
> -- Ted
>
> __________________________________________________________
> | Edward Mansell <ted.mansell@xxxxxxxx>
> | National Severe Storms Laboratory
> |--------------------------------------------------------------
> | "The contents of this message are mine personally and
> | do not reflect any position of the U.S. Government or NOAA."
> |--------------------------------------------------------------
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