== '''How to make a parallel run for nemo v3_3''' ==

[[PageOutline]]

[[BR]]
   
=== 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: [[BR]]
 {{{
 ./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: : [[BR]]
 {{{
 #-- 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: : [[BR]]
 {{{
 #-- 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,
}}}