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===General Info===

Weather Research and Forecasting (WRF) is a numerical weather prediction (NWP) system designed to serve both atmospheric research and operational forecasting needs. [[https://en.wikipedia.org/wiki/Weather_Research_and_Forecasting_Model|source]]

===Useful Links===

HPCAC Best Practices [[http://www.hpcadvisorycouncil.com/pdf/WRF_Best_Practices.pdf]] \\
WRF Compile Guide [[http://www2.mmm.ucar.edu/wrf/OnLineTutorial/compilation_tutorial.php]]

===Installation Guide===

Setup environment:

  mkdir WRF
  cd WRF
  mkdir libs
  mkdir tars

  vim bashrc

add:

  source /opt/intel/impi/5.0.1.035/bin64/mpivars.sh intel64
  source /opt/intel/bin/compilervars.sh intel64
  source /opt/intel/mkl/bin/mklvars.sh intel64
  export CC=icc
  export CXX=icpc
  export CFLAGS='-O3 -xHost -ip -no-prec-div -static-intel'
  export CXXFLAGS='-O3 -xHost -ip -no-prec-div -static-intel'
  export F77=ifort
  export FC=ifort
  export F90=ifort
  export FFLAGS='-O3 -xHost -ip -no-prec-div -static-intel'
  export CPP='icc -E'
  export CXXCPP='icpc -E'
  export DIR=~/WRF/libs	
  export PATH=$DIR/netcdf/bin:$PATH
  export NETCDF=$DIR/netcdf
  export LDFLAGS=-L$DIR/grib2/lib
  export LD_LIBRARY_PATH=$DIR/grib2/lib:$LD_LIBRARY_PATH
  export CPPFLAGS=-I$DIR/grib2/include
  export JASPERLIB=$DIR/grib2/lib
  export JASPERINC=$DIR/grib2/include
  export WRFIO_NCD_LARGE_FILE_SUPPORT=1
  export PATH=~/WRF/WPS:$PATH
  export PATH=~/WRF/WRFV3/run:$PATH

  source bashrc

==Jasper==

  cd ~/WRF/tars
  wget http://www2.mmm.ucar.edu/wrf/OnLineTutorial/compile_tutorial/tar_files/jasper-1.900.1.tar.gz
  tar -xf jasper-1.900.1.tar.gz
  cd jasper-1.900.1
  ./configure --prefix=/home/$USER/WRF/libs/grib2
  make 
  make install

==NetCDF==

  cd ~/WRF/tars
  wget http://www2.mmm.ucar.edu/wrf/OnLineTutorial/compile_tutorial/tar_files/netcdf-4.1.3.tar.gz
  tar -xf netcdf-4.1.3.tar.gz
  cd netcdf-4.1.3
  ./configure --prefix=/home/$USER/WRF/libs/netcdf --disable-dap --disable-netcdf-4 --disable-shared
  make -j12
  make check
  make install

==WRF==

  cd ~/WRF/tars
  wget http://www2.mmm.ucar.edu/wrf/src/WRFV3.7.TAR.gz
  tar -xf WRFV3.7.TAR.gz 
  mv WRFV3 ..
  cd ../WRFV3
  ./configure

You will be prompted to select config options for WRF.  NetCDF should be found from environment variables set above.

  for Linux x86_64 options: select 20,
  then option 1 for compile nesting

After the configure step is complete, build the code with:

  ./compile em_real

==WPS==

  cd ~/WRF/tars
  wget http://www2.mmm.ucar.edu/wrf/src/WPSV3.7.TAR.gz
  tar -xf WPSV3.7.TAR.gz
  mv WPS ..
  cd ../WPS

  ./configure 

Select option 17: Linux, with Intel, serial /w grib2

  ./compile

  ln -sf ungrib/Variable_Tables/Vtable.GFS Vtable 

===Benchmark===

  cd ~/WRF/tars

Download the input data for the benchmark here: [[http://www.ace.chpc.ac.za/tars/GEOG.tar.gz|GEOG.tar.gz]]

  tar -xf GEOG.tar.gz
  mv GEOG ..
  cd ../GEOG
  cp namelists.wps ../WPS
  cd ~/WRF/tars
  
And here : [[http://www.ace.chpc.ac.za/tars/DATA.tar.gz|DATA.tar.gz]]  

  tar -xf DATA.tar.gz
  mv DATA ..
  cd ../WPS
  ./link_grib.csh ../DATA/  

Build the model from the geographical data:

  ./geogrid.exe
  ./ungrib.exe
  ./metgrid.exe

Setup the benchmark run:

  cd ~/WRF
  cp GEOG/namelist.input WRFV3/run
  cd WRFV3/run
  ln -sf ../../WPS/met_em.d01.2015* .

Final setup step:

  ./real.exe

Start the benchmark with:

  mpirun -np <N> -hostfile <HF> ./wrf.exe

This benchmark completed in 51 minutes on a Dell C4130 with 24 Haswell cores.
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