Create S/M/L load-balanced PE-layouts for high-res physgrid (ne120np4.pg2) WC-cases on Cori-KNL

[amametjanov]

Physgrid (pg2) is now default in low-resolution WC runs. High-resolution WC-compset was recently added in #4551. Previous PE-layouts for ne120np4 need to be adjusted to account for pg2: e.g. for V1-vs-V2 benchmarking comparison.

[ndkeen]

Finally getting to this. I have ndk/machinefiles/cori-knl-pe-layouts-ne120pg2

I decided to keep 2 different sets for MPASSI and CICE. I kept the same node counts, but needed to use fewer MPI's per node for the MPASSI layouts as it requires more memory.

Using simple 5-day SMS test which doesn't include IO, here are estimated SYPD:

      Nodes   CICE   MPASSI
T     43      .32    .29
S     85      .55    .52
M    169     1.0     .84
L    338     1.6     1.4
X   1024     2.4     2.2

For the X size, recall there is 50% discount on cori for jobs with node counts at or above 1024.

Example test:

  SMS.ne120pg2_r0125_oRRS18to6v3.F2010.cori-knl_intel
  SMS.ne120pg2_r0125_oRRS18to6v3.F2010-CICE.cori-knl_intel

We could slightly improve the MPASSI layouts if we generated more MPAS ICE partition files.