Hello, On Mon, 1 Apr 2013 01:14:11 +0200 Alfredo Solano MartÃnez <asol...@icai.es> wrote: > > The logic would then be something like this: > - when increasing the refcount, a thread writes only to its own subcounter, > creating one first if necessary. > - similarly, when decreasing the refcount, there is no need to access other > subcounters until that subcounter reaches zero. > - when a subcounter gets to zero, delete it, and read the other subcounters > to check if it was the last one.
But then you will decrement another subcounter, right? Meaning you need a lock around all increments / decrements. > Unfortunately, in a crude test of mine there is already a severe performance > degradation, and that is without rwlocks. Yes, there will be. Given how often INCREF and DECREF are called, any complication of their implementation will significantly decrease single-threaded performance. See also http://mail.python.org/pipermail/python-ideas/2009-November/006599.html Regards Antoine. _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com