[Baypiggies] What garbage!

Aahz aahz at pythoncraft.com
Fri Feb 16 23:14:21 CET 2007

On Thu, Feb 15, 2007, Dennis Reinhardt wrote:
> At 02:21 PM 2/15/2007, Chad Netzer wrote:
>>Dennis, you said in your example, "The final time.sleep(2000) is to
>>allow time for garbage collection to reduce memory usage."  However,
>>that certainly will have no effect with CPython, nor do operating
>>system memory allocators work that way.
> I read at http://docs.python.org/lib/module-gc.html where it says
>          "tune the collection frequency"
> and other statements on this page to mean that the garbage collector makes 
> periodic sweeps of object references.  I do not see what the timing is.  I 
> did provide for a window in this code so that if such a sweep resulted in 
> lowering memory requirements, I had provided for time to go by.

Generally speaking, GC runs depend on object allocation/de-allocation,
not clock time.  GC will run when X number of objects have been created
without deallocating them.  (There are some subtleties involved, but
that's the essence.)  As Chad pointed out, this is separate from Python's
regular refcount mechanism.
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"I disrespectfully agree."  --SJM

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