Chris Colbert wrote:
> alright i made the change and here is the code:
>
> cdef double count(int n) nogil:
> cdef int i, j, k
> cdef double out
> for i from 0 <= i < n:
> for j from 0 <= j < n:
> out = 0
> for k from 0 <= k < n:
> out += k
>
> return out
>
>
> def myinterface():
> cdef int n = 10000000
> cdef double out
> out = count(n)
> return out
<SNIP>
> i presume this is because myinterface() doesn't release the gil, and
> thus waits for count() to return.
>
> How do I work this so that I can run a c-function outside the gil and
> thus make use of the multi-cores on my machine?
When you do
cdef double count(int n) nogil
it merely declared that the function /can/ be run without the GIL, but
it doesn't explicitly release it. Do this:
def myinterface():
...
with nogil:
out = count(n)
return out
--
Dag Sverre
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