<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hi Klemens,<div class=""><br class=""></div><div class="">I am not entirely sure, but: The classical netCDF file format imposes a limit of 4GB on individual variables. With 4000x2500 grid columns (10 million), you are probably facing this problem for the 3D variables. The MPAS website <a href="https://mpas-dev.github.io" class="">https://mpas-dev.github.io</a> (MPAS-Atmosphere Download -> MPAS-Atmosphere meshes) describes this problem briefly for the 10km mesh with 6 million cells (and three times as many edges).</div><div class=""><br class=""></div><div class="">Can you try to use the NetCDF4 format and see if the problem goes away? NetCDF4 usage is activated by setting the environment variable NETCDF4 to 1 before running ./configure and compiling the model (<a href="http://www2.mmm.ucar.edu/wrf/users/docs/user_guide_V3/users_guide_chap5.htm#_Installing_WRF" class="">http://www2.mmm.ucar.edu/wrf/users/docs/user_guide_V3/users_guide_chap5.htm#_Installing_WRF</a>). Make sure to do a ./clean -a beforehand.</div><div class=""><br class=""></div><div class="">Cheers,</div><div class=""><br class=""></div><div class="">Dom</div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On 30/04/2017, at 11:52 AM, Klemens Barfus <<a href="mailto:klemens.barfus@tu-dresden.de" class="">klemens.barfus@tu-dresden.de</a>> wrote:</div><br class="Apple-interchange-newline"><div class="">
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Dear all,<br class="">
<br class="">
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).<br class="">
Large file support has been enabled by setting <span class="st">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 </span><span class="st">WRFIO_NCD_LARGE_FILE_SUPPORT
is recognized. Errror Message for the last domain (~4000*2500
gridpoints) is <br class="">
<br class="">
Processing domain 4 of 4<br class="">
Processing XLAT and XLONG<br class="">
ERROR: Error in ext_pkg_write_commit<br class="">
<br class="">
There are no limitations on the file size in our system (tested as
suggested from
<a class="moz-txt-link-freetext" href="https://www.unidata.ucar.edu/software/netcdf/faq-lfs.html">https://www.unidata.ucar.edu/software/netcdf/faq-lfs.html</a>). I run
geogrid.exe with 30GB memory of each CPU to avoid problems due to
insufficient memory. <br class="">
<br class="">
WRF and WPS have been compiled with the following libraries for
application in distributed memory mode:<br class="">
<br class="">
</span><span class="st"><span class="st">8)
GCCcore/5.3.0 <br class="">
</span>9) binutils/2.26-GCCcore-5.3.0 <br class="">
</span><span class="st"><span class="st"> 10)
icc/2016.3.210-GCC-5.3.0-2.26</span><br class="">
</span><span class="st"><span class="st">11)
ifort/2016.3.210-GCC-5.3.0-2.26<br class="">
</span></span><span class="st"><span class="st"><span class="st">12)
iccifort/2016.3.210-GCC-5.3.0-2.26 </span></span>
<br class="">
</span><span class="st"><span class="st">13)
impi/5.1.3.181-iccifort-2016.3.210-GCC-5.3.0-2.26 </span><br class="">
</span><span class="st"><span class="st">14)
iimpi/2016.03-GCC-5.3.0-2.26 </span><br class="">
</span><span class="st"><span class="st">15)
imkl/11.3.3.210-iimpi-2016.03-GCC-5.3.0-2.26<br class="">
</span></span><span class="st"><span class="st"><span class="st">16)
intel/2016.03-GCC-5.3 <br class="">
</span></span>17) JasPer/1.900.1-intel-2016.03-GCC-5.3<br class="">
18) zlib/1.2.8-intel-2016.03-GCC-5.3<br class="">
19) Szip/2.1-intel-2016.03-GCC-5.3<br class="">
20) HDF5/1.8.16-intel-2016.03-GCC-5.3<br class="">
21) cURL/7.47.0-intel-2016.03-GCC-5.3<br class="">
22) netCDF/4.4.0-intel-2016.03-GCC-5.3<br class="">
23) netCDF-Fortran/4.4.3-intel-2016.03-GCC-5.3<br class="">
<br class="">
Does anybody has an idea, what could be the problem ? Any help is
greatly appreciated !<br class="">
<br class="">
Many thanks for your help in advance !<br class="">
<br class="">
Klemens<br class="">
</span>
</div>
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