[Mesa-users] Optimizing MESA for HPC server with 128 cores and 128Gb memory

[Rob Farmer]

Hi Levi,

First off you can't use mesa3335.net in a mesa model. Limitations in how
mesa handles arrays means the max number of isotopes is ~500 (depending on
the number of mesh points).

If your machine has 128 cores then you just do:
export OMP_NUM_THREADS=128

See Section 6 of
https://ui.adsabs.harvard.edu/abs/2019ApJS..243...10P/abstract for a
discussion of MESA's scaling with core counts. Short answer is that it is
not linear, so don't expect MESA to use all available CPUs all the time.

Rob


On Tue, 16 May 2023 at 10:41, Levi via Mesa-users <
mesa-users at lists.mesastar.org> wrote:

> Dear  MESA-users,
>
> I have a question about using MESA on high-performance computing systems.
> I want to use the large reaction network mesa3335.net to evolve a model,
> but my local computer shows insufficient memory. So we switched to a server
> with 128 cores and 128Gb of RAM, but it still doesn't work, MESA does not
> seem to fully utilize the CPU and memory.
>
> How do we properly configure MESA to leverage the computing resources of
> this server? Specifically, how can we set up the parameters to ensure MESA
> calls on the multiple cores and large memory available?
>
> Any guidance you can provide would be greatly appreciated. Thank you in
> advance for your time and assistance!
>
> Best,
> Levi
> _______________________________________________
> mesa-users at lists.mesastar.org
> https://lists.mesastar.org/mailman/listinfo/mesa-users
>
>
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