`fre run`: gen-srun

[singhd789]

Everything needed for the srun command is defined in the layout information:

• for non-coupled model --> https://gitlab.gfdl.noaa.gov/m5/am5xml/-/blob/main/xml_include/xml_layouts.xml?ref_type=heads#L5-13
  • srun command will be srun --ntasks=576 --cpus-per-task=2 --export=ALL,OMP_NUM_THREADS=2 ./fms_am5f12e0r1_compile.x
• for a coupled mode like: https://gitlab.gfdl.noaa.gov/m5/am5xml/-/blob/main/xml_include/xml_layouts.xml?ref_type=heads#L35-43
  • srun command will be srun --ntasks=576 --cpus-per-task=2 --export=ALL,OMP_NUM_THREADS=2 ./fms_am5f11d11r0_compile.x : --ntasks=2021 --cpus-per-task=1 --export=ALL,OMP_NUM_THREADS=1 ./fms_am5f11d11r0_compile.x

Notes:

• whenever there is more than 1 rank feature defined, that means it's a coupled model
  • In a coupled model you define ranks for both atmosphere and ocean
• cpus-per-task and OMP_NUM_THREADS are both associated with the threads
• --export=ALL is usually always going to be defined
• for lnd and ice, the ranks and threads are basically going to be the same at atm. Ex:

    atm:
      ranks: '576'
      threads: 2
      layout: 4,24
      io_layout: 1,4
      mask_table: null
    lnd:
      ranks: null
      threads: null
      layout: 4,24
      io_layout: 1,4
      mask_table: null
    ocn:
      ranks: '2021'
      threads: 1
      layout: 64,42
      io_layout: 1,3
      mask_table: mask_table.667.64x42
    ice:
      ranks: null
      threads: null
      layout: 96,6
      io_layout: 1,3
      mask_table: null

For lnd --> (4)(24)(6) = 576
For ice --> (96)*(6)=576
(could it be better if ranks and threads are NOT defined for lnd and ocn??)