Exploiting Dual Core's with Py_NewInterpreter's separated GIL ?

Steve Holden steve at holdenweb.com
Sat Nov 4 04:50:11 CET 2006

robert wrote:
> Daniel Dittmar wrote:
>>robert wrote:
>>>garbage is collected earliest, when the refcount went to 0. If it ever 
>>>went to 0, no one will ever use such object again. Thus GC should not 
>>>be different at all.
>>Since Python 2.?, there's a mark-and-sweep garbage collection in 
>>addition to the reference counting scheme. This was put into Python to 
>>be able to reclaim object cycles.
> still that only walks on objects which have already zero refcount. Cannot imagine any additional problems with the GIL.
If I understand you correctly, then you are suffering a misapprehension. 
Any object whose reference count goes to zero will immediately be 
reclaimed. The mark-sweep garbage collector is used to detect objects 
that are taking part in cycles - sets of objects that only refer to each 
other without being bound to a name in any current namespace or to any 
container object bound to such a name.

In other words, it detects (and reclaims) objects with non-zero 
reference counts which nevertheless can be reclaimed without ill effect 
on the program.

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