[Python-checkins] r70653 - in python/branches/py3k: Doc/whatsnew/2.7.rst

Sat Mar 28 20:20:09 CET 2009

Author: antoine.pitrou
Date: Sat Mar 28 20:20:09 2009
New Revision: 70653
Log:
Merged revisions 70647,70652 via svnmerge from 
svn+ssh://pythondev@svn.python.org/python/trunk
........
 r70647 | antoine.pitrou | 2009年03月28日 20:10:13 +0100 (sam., 28 mars 2009) | 3 lines
 
 Publicize the GC untracking optimization
........
 r70652 | antoine.pitrou | 2009年03月28日 20:17:54 +0100 (sam., 28 mars 2009) | 3 lines
 
 Fix a typo and be more specific
........
Modified:
 python/branches/py3k/ (props changed)
 python/branches/py3k/Doc/whatsnew/2.7.rst
Modified: python/branches/py3k/Doc/whatsnew/2.7.rst
==============================================================================

--- python/branches/py3k/Doc/whatsnew/2.7.rst	(original)
+++ python/branches/py3k/Doc/whatsnew/2.7.rst	Sat Mar 28 20:20:09 2009
@@ -129,6 +129,18 @@
 (Suggested by Martin von Loewis and implemented by Antoine Pitrou;
 :issue:`4074`.)
 
+* The garbage collector tries to avoid tracking simple containers which
+ can't be part of a cycle. As of now, this is true for tuples and dicts
+ containing atomic types (such as ints, strings, etc.). Transitively, a dict
+ containing tuples of atomic types won't be tracked either. This helps bring
+ down the individual cost of each garbage collection, since it decreases the
+ number of objects to be considered and traversed by the collector.
+
+ To help diagnosing this optimization, a new function in the :mod:`gc`
+ module, :func:`is_tracked`, returns True if a given instance is tracked
+ by the garbage collector, False otherwise.
+ (Contributed by Antoine Pitrou; :issue:`4688`.)
+
 
 .. ======================================================================
 
