can multi-core improve single funciton?
robert.kern at gmail.com
Fri Feb 20 16:52:02 EST 2009
On 2009-02-20 13:20, Unknown wrote:
> On 2009-02-20, Aahz<aahz at pythoncraft.com> wrote:
>> Steven D'Aprano<steven at REMOVE.THIS.cybersource.com.au> wrote:
>>> As I understand it, there's very little benefit to multi-cores
>>> in Python due to the GIL.
>> As phrased, your statement is completely wrong. Here's a more
>> correct phrasing: "For threaded compute-bound applications
>> written in pure Python, there's very little benefit to
>> multiple cores." But threaded I/O-bound applications do
>> receive some benefit from multiple cores, and using multiple
>> processes certainly leverages multiple cores. If boosting the
>> performance of a threaded compute-bound application is
>> important, one can always write the critical parts in C/C++.
> Do the crunchy bits of scipy/numpy, scientific python, vtk and
> other compute-intensive libraries tend to release the GIL while
> they're busy "computing"?
Often. Not as often as they could, sometimes.
"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
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