[Wrf-users] Problems with NetCDF Large File Support with geogrid.exe

[Klemens Barfus]

Dear all,

I am working with WRF3.8.1 on the supercomputer of our university and 
have problems writing files larger than 2.2 GB from geogrid.exe (may be 
from other routines, too).
Large file support has been enabled by setting 
WRFIO_NCD_LARGE_FILE_SUPPORT to 1. Running geogrid.exe for 4 nested 
domains geo_em.d<>.nc for the first three domains are written properly 
as '64-bit offset', so I expect that WRFIO_NCD_LARGE_FILE_SUPPORT is 
recognized. Errror Message for the last domain (~4000*2500 gridpoints) is

Processing domain 4 of 4
   Processing XLAT and XLONG
ERROR: Error in ext_pkg_write_commit

There are no limitations on the file size in our system (tested as 
suggested from 
https://www.unidata.ucar.edu/software/netcdf/faq-lfs.html). I run 
geogrid.exe with 30GB memory of each CPU to avoid problems due to 
insufficient memory.

WRF and WPS have been compiled with the following libraries for 
application in distributed memory mode:

8) GCCcore/5.3.0
9) binutils/2.26-GCCcore-5.3.0
10) icc/2016.3.210-GCC-5.3.0-2.26
11) ifort/2016.3.210-GCC-5.3.0-2.26
12) iccifort/2016.3.210-GCC-5.3.0-2.26
13) impi/5.1.3.181-iccifort-2016.3.210-GCC-5.3.0-2.26
14) iimpi/2016.03-GCC-5.3.0-2.26
15) imkl/11.3.3.210-iimpi-2016.03-GCC-5.3.0-2.26
16) intel/2016.03-GCC-5.3
17) JasPer/1.900.1-intel-2016.03-GCC-5.3
18) zlib/1.2.8-intel-2016.03-GCC-5.3
19) Szip/2.1-intel-2016.03-GCC-5.3
20) HDF5/1.8.16-intel-2016.03-GCC-5.3
21) cURL/7.47.0-intel-2016.03-GCC-5.3
22) netCDF/4.4.0-intel-2016.03-GCC-5.3
23) netCDF-Fortran/4.4.3-intel-2016.03-GCC-5.3

Does anybody has an idea, what could be the problem ? Any help is 
greatly appreciated !

Many thanks for your help in advance !

Klemens
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