[Numpy-discussion] Long-standing issue with using numpy in embedded CPython

[Robert Kern]

On Fri, Dec 9, 2011 at 13:18, Pierre Haessig <pierre.haessig at crans.org> wrote:
> Le 09/12/2011 09:31, Robert Kern a écrit :
>> We have some global state
>> that we need to keep, and this gets interfered with in a multiple
>> interpreter environment.
> I recently got interested in multiprocessing computation with numpy and
> now I get scare by your statement !
> Please don't tell me it is unsafe to launch multiple jobs (for instance
> with multiprocressing's Pool.map) just doing some ndarray arithmetic !
>
> That's why I'd like to understand better the issue raised by Yang. For
> instance, what does exactly "multiple CPython interpreters" stands for ?

Using multiprocessing is fine. That starts up multiple interpreters in
*different* processes. Yang is using a non-Python program that embeds
the CPython interpreter and starts up multiple copies of it in the
same process.

-- 
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