Do I need to have CPU throttling turned off just to build ATLAS or all the time?

Question

I am installing NumPy on Ubuntu 14.04.1 and it the install first requires that I install ATLAS. For this I am told I need to disable CPU throttling. My question is do I just need to disable it for the build or all the time?

Thanks.

Answer 1

You only have to turn it off during the installation phase. It interferes with the performance tests and measurements during the install phase.

The related section in the installation guide states:

CPU throttling makes pretty much all timings completely random, and so any ATLAS install will be junk. Therefore, before installing ATLAS, turn off CPU throttling.