On 04/14/2012 08:10 PM, Robert Bradshaw wrote:
On Sat, Apr 14, 2012 at 1:56 AM, Stefan Behnel<stefan...@behnel.de> wrote:
Dag Sverre Seljebotn, 14.04.2012 10:41:
Greg Ewing wrote:
Dag Sverre Seljebotn wrote:
1) It doesn't work well with multiple interpreter states. Ok, nothing
works with that at the moment, but it is on the roadmap for Python
Is it really? I got the impression that it's not considered feasible,
since it would require massive changes to the entire implementation
and totally break the existing C API. Has someone thought of a way
around those problems?
I was just referring to the offhand comments in PEP3121, but I guess that PEP
had multiple reasons, and perhaps this particular arguøent had no
significance...
IIRC, the last status was that even after this PEP, Py3 still has serious
issues with keeping extension modules in separate interpreters. And this
probably isn't worth doing anything about because it won't work without a
major effort in all sorts of places. And I never heard that any extension
module even tried to support this.
I don't think we should invest too much thought into this direction.
A shame; short of getting rid of the GIL, multiple interpreter states
would be my favourite shared-memory parallel computation approach, as
they could share NumPy buffers (and other C-level structures), without
worrying about allocating in process-shared memory (and most data
structures, like std::map, won't even work (or, work portably and
reliably) in process-shared memory anyway).
Multiple seperate interpreter states would be a very nice way of getting
the benefits of multi-threading without the disadvantages.
I had never even heard of this PEP before this thread, but this
certainly seems reasonable to me. Aside from this, there is some value
with the inlined signature in that a pure C library can easily support
the ABI as well.
Yes -- I think both "sides" of this discussion prefer their approach out
of aesthetics more than performance :-)
I'll post a revamped CEP in a minute to at least try to sum them up.
Has anyone done any experiments/timings to see if having constants vs.
globals even matters?
It'd be interesting to see; won't have time myself until Monday earliest.
Dag
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