Use 512 NUM_THREADS for OpenBLAS

[ViralBShah]

In line with https://github.com/JuliaPackaging/Yggdrasil/blob/master/O/OpenBLAS/common.jl

[staticfloat]

I think it’s worth mentioning in the comment where someone should look for the code that actually limits the number of threads.

[ViralBShah]

I think it’s worth mentioning in the comment where someone should look for the code that actually limits the number of threads.

Within openblas? Within Julia we have removed that restriction at the moment. My thought is we can experiment a little bit to see how that feels before bringing the newly discussed limit back.

[staticfloat]

Within Julia we have removed that restriction at the moment.

I thought that we wanted to re-introduce a maximum of e.g. 32, unless an environment variable is set to override that default.

[ViralBShah]

Within Julia we have removed that restriction at the moment.

I thought that we wanted to re-introduce a maximum of e.g. 32, unless an environment variable is set to override that default.

Yes, we discussed doing that. My thought was that since we are early enough in the 1.8 cycle, we can see how things feel for now with the large limits and get some regression testing in, and introduce the 32 max threads a little closer to release (or at least wait a few weeks).

Should we open an issue and put it on the milestone to make sure we don't forget?