How to run CESM2.0.1 faster with FATES on?

M

Mingjun

Mingjun
New Member
Hi, there!

I am confused of the running speed of CESM2.0.1. The configuration I used is B1850 and the resolution is f19_g17. I also turn the FATES on and make the ice evloved. I am not familiar with the pe setting. My current setting is attached. The speed is 2.4 year/day. I need a nearly 5000-year simulation. The speed is too slow for me...

p.s. I also do not understand the relationship between the NTASKS of atm and ocn. If I set them in the same number, there would be errors (like POP aborting... Stopping in ecosys_driver:ecosys_driver_init). When NTASKS of atm is 2 times as ocn, the experiment would run successfully.

Any suggestions would be helpful for me. Thanks for your time!!
 

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jedwards

CSEG and Liaisons
Staff member
First - why are you using cesm 2.0.1? The cmip6 release is 2.1.5, I recommend you update to that.
Second in your pelayout you have ocn and ice components on the same tasks. You might do better if you change
the values to
ROOTPE_ICE= 28,ROOTPE_OCN=112,NTASKS_ICE=84

I try to obey the following rules when setting pelayouts for B (allactive) cases.

NTASKS_ATM=NTASKS_CPL
NTASKS_ICE+NTASKS_LND=NTASKS_ATM
NTASKS_ROF=NTASKS_LND
ROOTPE_ICE=NTASKS_LND
ROOTPE_OCN=NTASKS_ATM
 
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