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Your $HOME and $WORK directories (on glade) are the same path on cheyenne and derecho. Therefore, it is recommended to create a new directory (in $HOME or $WORK) for cases you will run on derecho, to not confuse them with cases built on cheyenne (which will not run on derecho).  Derecho and cheyenne have separate $SCRATCH directories.$SCRATCH directories. New PE-layouts are still being developed. We are working on updating these compsets. One way to increase performance is to use this namelist setting:

You will need to ssh into 

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https://docs.google.com/presentation/d/1BAYI9NdyAnZzU3KLat0CK2sQj34XE_K5Wan9zL8rsQ0/edit?usp=sharing

CESM2.2 on Derecho

Note, the pe-layout of existing compsets in the new code base of CESM2 for derecho (cesm2.2.2) have not been adjusted to the new computer, and running out of the box can lead to large differences in computer costs compared to running on cheyenne. 

phys_loadbalance = 1

(A) Download a copy of the model source code to your own directory

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> cd components/clm
> git fetch origin
> git checkout release-cesm2.2.01/hist_opt

Note, the pe-layout of existing compsets in the new code base of CESM2 for derecho (cesm2.2.2) have not been adjusted to the new computer, and running out of the box can lead to large differences in computer costs compared to running on cheyenne. 

phys_loadbalance = 1

If you want to run a regional refined model simulation on derecho, you may use the following sandbox that will provide the same performance on derecho as it did on cheyenne:

/glade/work/fvitt/cesm/cesm2.2.2_musica

(B) Create a new case

2. Use the code in the model directory $CESM_ROOT to create a new case called $CASENAME:

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