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Merged revisions 70647,70652 via svnmerge from 

svn+ssh://pythondev@svn.python.org/python/trunk

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  r70647 | antoine.pitrou | 2009-03-28 20:10:13 +0100 (sam., 28 mars 2009) | 3 lines

  Publicize the GC untracking optimization
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  r70652 | antoine.pitrou | 2009-03-28 20:17:54 +0100 (sam., 28 mars 2009) | 3 lines

  Fix a typo and be more specific
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Antoine Pitrou 2009-03-28 19:20:09 +00:00
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Doc/whatsnew/2.7.rst
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@ -129,6 +129,18 @@ A few performance enhancements have been added:
(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`.)
.. ======================================================================