[Mesa-users] Regarding number of threads in M1

[Evan Bauer]

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
>>>> https://lists.mesastar.org/mailman/listinfo/mesa-users
>>>> 
>>> 
>> 
>> Regards,
>> Abhijnan Kar(He/his/him)
>> BS-MS,IISER Berhampur
>> 
>> 
>> 
>> 
>> 
>> 
> 
> Regards,
> Abhijnan Kar(He/his/him)
> BS-MS,IISER Berhampur
> 
> 
> 
> 
> 
> 
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