Tasks vs threads

[TCNasa]

I need some help in running CESM faster. Typically my runs use 12 tasks for all of CESM components. I'm not sure I understand the relationship of tasks vs threads.
Each of my nodes has 12 cpus available. Do I need to assign more tasks or more threads to run CESM faster?

Thanks.

 

[jedwards]

Tasks are generally much faster than threads but it's highly system dependent. If you are running anything other than a fully coupled component set it generally makes sense to run each component sequentially using all of the available tasks. For fully coupled (B) compsets you can run the ocn concurrently with the other components.

 

[TCNasa]

So what settings do I change to assign more than 1 task to each component? And how does that affect my MAX_TASK settings?

 

[jedwards]

You failed to mention what version of cesm you are using. Here is the documentation for cesm2.1

 

[TCNasa]

I"m using 2.2

 

[jedwards]

cesm2.2