OMP_NUM_THREADS warning

[adiegel]

Hi All,

I just updated my Firedrake install and now I am getting the warning message:

firedrake:WARNING OMP_NUM_THREADS is not set or is set to a value greater than 1, we suggest setting OMP_NUM_THREADS=1 to improve performance

How do I set the number of threads?

Thanks!

[rckirby]

It's an environment variable and can be set on the command line or in your profile/shell startup.

…

On Fri, Jul 9, 2021 at 12:55 PM adiegel ***@***.***> wrote: Hi All, I just updated my Firedrake install and now I am getting the warning message: firedrake:WARNING OMP_NUM_THREADS is not set or is set to a value greater than 1, we suggest setting OMP_NUM_THREADS=1 to improve performance How do I set the number of threads? Thanks! — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#2145>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AA4XUL75NTBSSGEQK4OOLM3TW4Z2TANCNFSM5ADGFI6A> .

[adiegel]

Thanks, @rckirby. After your quick response, I found this numpy/numpy#11826 which gave me the exact command I needed.

[hw454]

Hi I'm having this issue also. I can rectify it using: 'export OMP_NUMTHREADS=1' on command line but I'm having to do this everytime I activate the environment.
Is there a way to update the virtual environment so that this is set automatically every time I activate?

[connorjward]

You could in theory modify the firedrake/bin/activate file to include the export OMP_NUM_THREADS=1 line, but the more standard way to do this is to add the line to your ~/.bashrc file (assuming you're using Bash). That way this variable gets set every time you launch a terminal and persists across Firedrake installations.

Also, it would be better to open a new issue referencing this one rather than posting at the bottom.