How to make a parallel run for nemo v3_3

Add a cpp key and compile

see list of keys for nemo v3_3

​http://www.nemo-ocean.eu/Using-NEMO/User-Guides/Basics/CPP-keys-V3_3

• Add key key_mpp_mpi and set number of processors in ORCA2_LIM/cpp_ORCA2_LIM.fcm, and compile:
  

  ./makenemo -m SX8_BRODIE -n ORCA2_LIM add_key "key_mpp_mpi key_nproci=2 key_nprocj=2"
  

Configure config.card

• Set same number of processors at compiling time in ORCA2_LIM/IGCM00/config.card: :
  

  #-- Total Number of Processors 
  JobNumProcTot=#proc at compiling time
  

• Set a frequency for offline rebuild compatible with PeriodLength?

  RebuildFrequency=1Y
  

On brodie

• Enable multi NQS class :

  #-- PBS Class (required on brodie mono/multi)
  JobClass=multi
  

• Enable run multi processors option in ORCA2_LIM/IGCM00/config.card: :
  

  #-- Run Options :
  JobRunOptions='"-np "${BATCH_NUM_PROC_TOT}"'
  

On vargas

• Change MPI send type in namelist

     cn_mpi_send =  'I'      !  mpi send/recieve type   ='S', 'B', or 'I' for standard send,