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

[Daniel Dittmar]

robert wrote:
> (IPython is only a special "python network terminal" as already said.)

Sorry, I thought of IronPython, the .NET variant.

> Does Jython really eliminate the GIL? What happens when different 

Yes.

> threads alter/read a dict concurrently - the basic operation in python, 
> which is usually not protected by locks. Does Jython use a dict data 
> type (and other collection types) which lock during _each_ access? in 
> case - that may be very expensive.

True, though Java synchronization has gotten better and better. Still, 
Sun introduced non locking hash tables, so it was a problem. It'd be 
interesting to know which kind of dict is used in Jython for attribute 
access.
> 
> 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.


Daniel