[Mesa-users] MESA multithreaded performance

[Meisel, Zach]

For what it’s worth, for X-ray bursts I find diminishing returns beyond 4 cores.

-Zach

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Zach Meisel
Associate Professor of Physics & Astronomy
Director, Edwards Accelerator Laboratory
Ohio University
Email: meisel at ohio.edu
Web: http://inpp.ohio.edu/~meisel

From: Rob Farmer via Mesa-users<mailto:mesa-users at lists.mesastar.org>
Sent: Thursday, July 2, 2020 10:23 AM
To: Jeremy Sakstein<mailto:sakstein at hawaii.edu>
Cc: Nicholas.Herrington at myport.ac.uk<mailto:Nicholas.Herrington at myport.ac.uk>; mesa-users at lists.mesastar.org<mailto:mesa-users at lists.mesastar.org>
Subject: Re: [Mesa-users] MESA multithreaded performance

Hi,

There is a discussion of this in section 6 of https://ui.adsabs.harvard.edu/abs/2019ApJS..243...10P

The short answer depends on the problem, but you're probably maxing the benefit at ~12 threads for most problems.  I would usually say if you're running one mesa problem at a time get a faster cpu, if you're running multiple mesas at once then get more cores.

Rob

On Thu, 2 Jul 2020 at 16:01, Jeremy Sakstein <sakstein at hawaii.edu<mailto:sakstein at hawaii.edu>> wrote:
Hi Nick,

In my experience this depends on what type of star you are running. Using both r12266 and r12778 I found:

solar mass main-sequence/RGB before helium burning/low-Z blue loops worked best with about 4 cores.

RSP test_suite cases didn't seem to use more than two cores even when I requested more.

Big jobs like the PPISN test_suite worked best with 16 cores.

I hope this helps, I'm sure people who have tested this more systematically than me have a better idea.

Cheers,

Jeremy



On Thu, Jul 2, 2020 at 9:54 AM Nicholas Herrington via Mesa-users <mesa-users at lists.mesastar.org<mailto:mesa-users at lists.mesastar.org>> wrote:
Hi all

I just had a quick question. I am upgrading my Linux machine and I’m just wondering from people’s experience does MESA favour more cpu cores or faster single core, if that makes sense?

Trying to decide between two CPUs of same generation, one has less cores but higher clock speeds and the other has more cores but lower clock speeds.

Thanks
Nick
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