[Mesa-users] [EXT] Question about scaling of the PPISN test suite

[Jeremy Sakstein]

Thanks Mathieu,

This is very helpful.

Do you happen to recall how long a run took on 8 cores?

Also, I meant to ask above: do you have any recommendations for the memory
for PPISN? I usually request 10GB but this is again not based on detailed
experiments.

Cheers,

Jeremy

On Wed, Sep 11, 2024 at 3:05 PM Renzo, Mathieu - (mrenzo) <
mrenzo at arizona.edu> wrote:

> Hi Jeremy,
>
> The maximum efficiency will likely be sensitive to your specific setup and
> MESA version, and the experiment I did with MESA 11123 are probably not
> informative anymore/at all. For what it's worth, i ran most of my grids
> back then using 8 cores, so that I could fill nodes of the cluster with an
> integer number of models (and threw away many failing models).
>
> It also depends on the size and dimensions (as in number of parameters you
> vary) in your grid: the rule of thumb is that for a given number of
> available cores, fewer cores per model to run more models in parallel gets
> you the grid faster (see for example Rob Farmer's examples setting
> OMP_NUM_THREADS=1 https://cococubed.com/mesa_market/many_jobs.html
> <https://urldefense.com/v3/__https://cococubed.com/mesa_market/many_jobs.html__;!!PvDODwlR4mBZyAb0!VkkzZKyZJvimPltkyP-lGErTtUlxkRslra616PYal-kcdXZ14nvuyM3pI_PAKQAbH2WPjKR5fRW9UUPiAOo$>
> ).
>
> All that being said, 19 cores is probably a lot (and a number that will
> probably not optimize the number of models you can fit on each node of a
> cluster). But you'll have to profile your setup yourself and consider the
> number of core per node available at the computing facility you have access
> to.
>
> Hope this helps!
> Mathieu
>
> From tiny keyboard
>
> ------------------------------
> *From:* Mesa-users <mesa-users-bounces at lists.mesastar.org> on behalf of
> Jeremy Sakstein via Mesa-users <mesa-users at lists.mesastar.org>
> *Sent:* Wednesday, September 11, 2024 5:35 PM
> *To:* mesa-users <mesa-users at lists.mesastar.org>
> *Subject:* [EXT] [Mesa-users] Question about scaling of the PPISN test
> suite
>
>
>
> * External Email *
> ------------------------------
> Hi everyone,
>
> I am planning to run a large grid of models using a work directory based
> on the PPISN test suite.
>
> Has anyone experimented with the efficiency of parallelization for this? I
> typically run on 19 threads but this is not based on anything quantitative.
>
> I'd like to make the runtime as efficient as possible.
>
> Cheers,
>
> Jeremy
>
> --
> Jeremy Sakstein (He/Him/His)
> Assistant Professor of Theoretical Physics
> Department of Physics & Astronomy
> University of Hawaiʻi at Mānoa
> Watanabe Hall
> 2505 Correa Road
> Honolulu, HI, 96822, USA
> http://www.jeremysakstein.com
> <https://urldefense.com/v3/__http://www.jeremysakstein.com/__;!!PvDODwlR4mBZyAb0!VkkzZKyZJvimPltkyP-lGErTtUlxkRslra616PYal-kcdXZ14nvuyM3pI_PAKQAbH2WPjKR5fRW9x89RKeY$>
>


-- 
Jeremy Sakstein (He/Him/His)
Assistant Professor of Theoretical Physics
Department of Physics & Astronomy
University of Hawaiʻi at Mānoa
Watanabe Hall
2505 Correa Road
Honolulu, HI, 96822, USA
http://www.jeremysakstein.com
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