[Qt-interest] QThread and multi-core

[NARCISO, Rui]

So if I understand correctly, I should use QThreads instead of python threads and since I use no locking, only signals/slots to communicate with my Gui, I could have as many parallel QThreads as the ones I launch ? Or is the number of QThreads limited somehow?

-----Message d'origine-----
De : qt-interest-bounces at trolltech.com
[mailto:qt-interest-bounces at trolltech.com]De la part de Arnold Krille
Envoyé : vendredi 3 avril 2009 14:15
À : qt-interest at trolltech.com
Objet : Re: [Qt-interest] QThread and multi-core


On Friday 03 April 2009 13:21:59 NARCISO, Rui wrote:
> Is there any way with python thread or even QThread to force the threads to
> be executed on a CPU which is not the main CPU ?
> I have a quad core and only CPU 1 is being used for the threads I create.

That is natively possible in QThread (unless you use extensive locking and the 
gui-thread holds the lock) and should happen automaticly. Actually you don't 
want to decide which core your thread runs on, the systems scheduler is better 
suited for that.
But its not really possible in python. Because of the big interpreter lock, 
you can run different threads in "parallel" but as only one python-instance can 
run at a time only one thread running python-code can be active at a time. If 
the secondary threads are native QThreads, or do big external things and 
release the BIL, they can truly run parallel, otherwise its not possible to 
the best of my knowledge.

Have fun,

Arnold

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