About threads in python

Stefan Behnel stefan_ml at behnel.de
Thu Apr 21 10:09:20 EDT 2011

dutche, 21.04.2011 15:19:
> Here's the thing...I had to make a program with threads and after
> finished, I found some posts and articles in Google about Python and
> threads, raising the question about if it really implements thread
> programming or not, because of GIL and the way Python needs to lock
> some objects.
> I have now in my program something about 8 threads and each of them
> runs different code based on some directives, these codes relies
> sometimes in C api, using classes like zipfile and tarfile, and others
> relies only in python code.

What do you mean by "relies sometimes on C api"? Do you mean that it uses 
binary modules, as opposed to Python modules?

> My question is about the efficiency of threads in python, does anybody
> has something to share?

 From your (rather unspecific) description, I gather that you are doing 
mostly I/O operations. Threading is an acceptable programming model for 
that, and Python supports it just fine. The GIL is usually released for I/O 
operations by the runtime, so if your program is I/O bound, you will get 
full threading concurrency.


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