[Python-3000] Delayed reference counting idea

["Martin v. Löwis"]

Antoine Pitrou schrieb:
> Has it been measured what cache effects reference counting entails ?

I don't think so.

> With reference counting, each object is mutable from the point of view
> of the CPU cache (refcnt is always incremented and later decremented).
> This means almost every cache line containing Python objects - including
> functions, modules... - has to be written back when it is evicted, even
> if those objects are "constant".

Yes, though this is likely negligible wrt. to the overhead that locking
operations on refcount changes would have.

Regards,
Martin