[Numpy-discussion] Numpy: controlling ATLAS multithreading

Ralf Gommers ralf.gommers@googlemail....
Wed Mar 23 08:26:47 CDT 2011

On Wed, Mar 23, 2011 at 10:11 AM, Mark Dixon <m.c.dixon@leeds.ac.uk> wrote:
> Hi,
> I've built Numpy 1.5.1 against a copy of ATLAS 3.8.3 and LAPACK 3.3.0,
> it's passing all tests and is looking good. Great.
> I note that Numpy preferentially links against the multi-threaded ATLAS
> libraries; however, we sometimes want to constrain a process to a single
> thread, and sometimes not. I see that ATLAS doesn't have the capability of
> setting the maximum number of threads used with, say, an environment
> variable.
> So, here comes the long-shot question:
> Does Numpy have the capability to choose between the single-threaded and
> multi-threaded ATLAS libraries at runtime? Or do I need to make this
> decision at build time?

You need to decide at build time.


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