[Python-ideas] Keep free list of popular iterator objects
anthonyfk at gmail.com
Sun Sep 15 21:19:30 CEST 2013
Well, don't I feel the fool. Thanks. :-)
On 2013-09-15 1:18 PM, "Tim Peters" <tim.peters at gmail.com> wrote:
> [ Kyle Fisher]
> > ...
> > Even if the iterator freelist isn't in first-level cache, I'm almost
> > it would exist within last-level cache. Do you know what the cost of
> > fetching from this is compared to grabbing a lock like the current
> > _Py_Malloc does?
> It's infinitely more expensive than grabbing a lock ;-) As Antoine
> noted earlier in this thread, while obmalloc.c is sprinkled with
> LOCK() and UNLOCK() macros, they all expand to "nothing" - obmalloc.c
> doesn't actually grab any locks (it relies on the GIL to serialize
> For example, LOCK is defined thusly:
> #define LOCK() SIMPLELOCK_LOCK(_malloc_lock)
> and above that there's:
> #define SIMPLELOCK_LOCK(lock) /* acquire released lock */
> Just FYI ;-)
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