[Wrf-users] Compiling for OpenMP on Cray systems?

[Dmitry N. Mikushin]

Dear Carl,

In GCC OpenMP runtime is abstracted from the language in the library called
libgomp:

$ readelf -a /usr/lib/gcc/x86_64-linux-gnu/4.6/libgomp.so | grep
GOMP_parallel_start
   139: 0000000000006fb0    79 FUNC    GLOBAL DEFAULT   12
GOMP_parallel_start@@GOMP_1.0

Try to link with it on the final link step, e.g. add -lgomp.

However, Cray compiler should provide its own OpenMP runtime, and I'm
wondering if Cray's and gcc's could happily coexist in the same application.

Best,
- D.

2012/9/12 Carl Ponder <cponder at nvidia.com>

>  I downloaded WRFV3.4.1.TAR.gz and am working on a Cray system.
> The configurator gave me these options (among others)
>
>   31.  Cray XT CLE/Linux x86_64, Cray CCE compiler with gcc  (serial)
>   32.  Cray XT CLE/Linux x86_64, Cray CCE compiler with gcc  (smpar)
>   33.  Cray XT CLE/Linux x86_64, Cray CCE compiler with gcc  (dmpar)
>   34.  Cray XT CLE/Linux x86_64, Cray CCE compiler with gcc  (dm+sm)
>
> and I picked number 34. When I compile I get the errors
>
> ftn -o wrf.exe -Oomp  -N255 -Onomodinline -em -Onoomp -f free -h
> byteswapio  -Oomp    wrf.o ../main/module_wrf_top.o libwrflib.a /mnt/lustr
> e_server/cponder/CUDA/WRF/UCAR/WRFV3/external/fftpack/fftpack5/libfftpack.a
> /mnt/lustre_server/cponder/CUDA/WRF/UCAR/WRFV3/external/io_grib
> 1/libio_grib1.a
> /mnt/lustre_server/cponder/CUDA/WRF/UCAR/WRFV3/external/io_grib_share/libio_grib_share.a
> /mnt/lustre_server/cponder/CUDA/WR
> F/UCAR/WRFV3/external/io_int/libwrfio_int.a
> -L/mnt/lustre_server/cponder/CUDA/WRF/UCAR/WRFV3/external/esmf_time_f90
> -lesmf_time /mnt/lustre
> _server/cponder/CUDA/WRF/UCAR/WRFV3/external/RSL_LITE/librsl_lite.a
> /mnt/lustre_server/cponder/CUDA/WRF/UCAR/WRFV3/frame/module_internal_he
> ader_util.o
> /mnt/lustre_server/cponder/CUDA/WRF/UCAR/WRFV3/frame/pack_utils.o
> -L/mnt/lustre_server/cponder/CUDA/WRF/UCAR/WRFV3/external/io
> _netcdf -lwrfio_nf -L/opt/cray/netcdf/4.2.0/cray/74/lib -lnetcdff
> -lnetcdf
> libwrflib.a(setfeenv.o): In function `setfeenv_':
> *setfeenv.c:(.text+0x46): undefined reference to `GOMP_parallel_start'*
> * **setfeenv.c:(.text+0x53): undefined reference to `GOMP_parallel_end'*
> make[1]: [em_wrf] Error 1 (ignored)
> make[1]: Leaving directory
> `/mnt/lustre_server/cponder/CUDA/WRF/UCAR/WRFV3/main'
>
> I can make these go away by removing the definitions
>
> 101   OMPCPP   =   -D_OPENMP
> 102   OMP      =   -mp -Mrecursive
> 103   OMPCC    =   -mp
>
> from configure.wrf, essentially making it run single-threaded.
> Are there some environment settings I need to use, to get this to run with
> OpenMP on the Cray?
> I tried loading the GCC module, in case the GOMP_parallel components were
> supposed to come from the gfortran library, but it didn't help.
> If I have to edit the configure.wrf file, I'd say it wasn't generated
> correctly to begin with, and the WRF toolkit ought to be fixed.
> Can any of you send me a configure.wrf and list of build instructions
> that will work?
> Thanks,
>
>                     Carl Ponder
>
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