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

[Renzo, Mathieu - (mrenzo)]

Order of 10s of hours (it also depends how many pulses a model encounters).

The memory requirements will depend on your spatial resolution and the nuclear reaction network mostly.  10GB should be sufficient unless you use large nuclear networks and/or very high resolution. In my experience the cpu is typically more stringent requirement than the memory.

From tiny keyboard

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From: Jeremy Sakstein <sakstein at hawaii.edu>
Sent: Wednesday, September 11, 2024 6:09 PM
To: Renzo, Mathieu - (mrenzo) <mrenzo at arizona.edu>
Cc: Jeremy Sakstein via Mesa-users <mesa-users at lists.mesastar.org>
Subject: Re: [EXT] [Mesa-users] Question about scaling of the PPISN test suite


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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<mailto: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

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From: Mesa-users <mesa-users-bounces at lists.mesastar.org<mailto:mesa-users-bounces at lists.mesastar.org>> on behalf of Jeremy Sakstein via Mesa-users <mesa-users at lists.mesastar.org<mailto:mesa-users at lists.mesastar.org>>
Sent: Wednesday, September 11, 2024 5:35 PM
To: mesa-users <mesa-users at lists.mesastar.org<mailto:mesa-users at lists.mesastar.org>>
Subject: [EXT] [Mesa-users] Question about scaling of the PPISN test suite


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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<http://www.jeremysakstein.com>
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