[PyQt] Multi-tasking and GIL

[Arnold Krille]

Hi,

On Tuesday 04 August 2009 11:45:49 NARCISO, Rui wrote:
> I have a quad-core linux machine and I would like to take advantage of all
> these extra cores to perform multiple heavy tasks simultaneously.
> If i understood it correctly, the GIL will prevent me from multi-threading
> this heavy tasks in order to make them run in parallel.
> My question is then, how to do this? Will QProcess be the solution? (the
> heavy tasks can either be ran by direct python acess through a run()
> function or in stand-alone when launched from the command line)

There are at least two solutions:

1) If the work-threads need to use python, run them as independant processes 
(via QProcess or process-module). Communication can then go via std-io, named 
pipes, sockets or if you don't want to invent everything from scratch, via 
dbus or similar protocols.
2) If the heavy work heavy enough to allow writing it in C++, create all the 
work-stuff as C++ classes and use them in python via SIP. That way the real 
running of the C++-code should unlock the GIL.

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Have fun,

Arnold
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