[Mesa-users] Regarding number of threads in M1

[ABHIJNAN KAR 20064]

Yeah,I am setting it in capital letters. I set it to 6/8/16/32 but the
computation time is not changing significantly. So I am wondering about the
number of threads in M1.Also supposedly there is no control over the number
of threads terminal is using. Even after setting the variable to 16, in
activity monitor it shows 6 threads are being used by terminal.

On Thu, 26 Jan 2023, 21:28 Evan Bauer, <evan.bauer.astro at gmail.com> wrote:

> Hi Abhijnan,
>
> The environment variable that MESA uses to set the number of threads is
> OMP_NUM_THREADS (this is case sensitive, so make sure you're setting it
> with all capital letters). Is this the exact variable you are setting?
> Setting omp_number_of_threads will not get picked up by MESA.
>
> Cheers,
> Evan
>
> On Jan 26, 2023, at 3:14 AM, ABHIJNAN KAR 20064 <
> abhijnank20 at iiserbpr.ac.in> wrote:
>
> Also, another thing I noticed, even though I am setting the number of
> threads to 16,in the activity monitor it is showing that the terminal is
> only using 6 threads.
>
> On 26-Jan-2023, at 1:07 PM, ABHIJNAN KAR 20064 <abhijnank20 at iiserbpr.ac.in>
> wrote:
>
> Thanks for the reply! I tested with various omp_number_of_threads. I set
> it to 6,8,16,32 but the computation time was more or less similar(for 287
> steps).It took around 5 mins for 287 steps . The lowest time was 4.77
> minutes with threads= 8. Setting the threads to 6 or 16 didn't improve
> computation time, rather it got a bit slow(by few seconds).
>
> On 26-Jan-2023, at 11:30 AM, Francis Timmes <fxt44 at mac.com> wrote:
>
> do the experiment and say what you find!
>
> the m1 pro has 10 cpu cores, two efficiency cores and eight high
> performance cores.
> there is a base model with 8 cpu cores, two efficiency cores and six high
> performance cores.
> another experiment to do is set the number of threads to the number of
> high performance cores,
> as a check on the two efficiency cores slowing down a run.
>
> fxt
>
>
>
>
> On Jan 25, 2023, at 12:47 PM, ABHIJNAN KAR 20064 <
> abhijnank20 at iiserbpr.ac.in> wrote:
>
> Hello users,
> I usually set omp_number_of_threads to 8 in my 8 core M1 macbook
> air.However, it seems that mesa run is slow on my machine using
> omp_numer_of_threads= 8.My question, can I set it to 16 ,as in general
> number_of_threads= 2* no of cores ?
> Regards,
> Abhijnan Kar(He/his/him)
> BS-MS,IISER Berhampur
>
>
>
>
>
>
> _______________________________________________
> mesa-users at lists.mesastar.org
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>
>
>
> Regards,
> Abhijnan Kar(He/his/him)
> BS-MS,IISER Berhampur
>
>
>
>
>
>
>
> Regards,
> Abhijnan Kar(He/his/him)
> BS-MS,IISER Berhampur
>
>
>
>
>
>
> _______________________________________________
> mesa-users at lists.mesastar.org
> https://lists.mesastar.org/mailman/listinfo/mesa-users
>
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>
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