On Fri, Dec 9, 2011 at 12:31 AM, Robert Kern <[email protected]> wrote: > On Thu, Dec 8, 2011 at 23:15, Yang Zhang <[email protected]> wrote: >> On Tue, Oct 4, 2011 at 12:05 PM, Yang Zhang <[email protected]> wrote: >>> On Tue, Oct 4, 2011 at 1:28 AM, Robin <[email protected]> wrote: >>>> On Mon, Oct 3, 2011 at 9:42 PM, Yang Zhang <[email protected]> wrote: >>>>> It turns out that there's a long-standing problem in numpy that >>>>> prevents it from being used in embedded CPython environments: >>>> >>>> Just wanted to make the point for reference that in general Numpy does >>>> work fine in (non-threaded) embedded CPython situations, see for >>>> example pymex [1] which embeds Python + Numpy in a Matlab mex file and >>>> works really well. >>>> >>>> This seems to a be a problem specific to Jepp. >>>> >>>> Just wanted to mention it in case it puts someone off trying something >>>> unnecessarily in the future. >>> >>> My (second-hand) understanding is that this is a problem with having >>> multiple CPython interpreters, which both Jepp and numpy utilize, >>> incompatibly - is that right? I.e., if either one were restricted to >>> using a single CPython interpreter, we wouldn't see this problem? >>> >>> I'm curious how to disable threads in numpy (not an ideal solution). >>> Googling seems to point me to setting NPY_ALLOW_THREADS to >>> 0....somewhere. >> >> Anyone? > > numpy does not use multiple interpreters. The threading options have > nothing to do with multiple interpreters, and will not let you use > multiple CPython interpreters in your application. The problem is that > Python does not have good isolation between multiple interpreters for > extension modules. Many extension modules happen to work in this > environment, but numpy is not one of them. We have some global state > that we need to keep, and this gets interfered with in a multiple > interpreter environment.
Thanks for the clarification. Alas. So is there no simple workaround to making numpy work in environments such as Jepp? > > -- > Robert Kern > > "I have come to believe that the whole world is an enigma, a harmless > enigma that is made terrible by our own mad attempt to interpret it as > though it had an underlying truth." > -- Umberto Eco > _______________________________________________ > NumPy-Discussion mailing list > [email protected] > http://mail.scipy.org/mailman/listinfo/numpy-discussion -- Yang Zhang http://yz.mit.edu/ _______________________________________________ NumPy-Discussion mailing list [email protected] http://mail.scipy.org/mailman/listinfo/numpy-discussion
