Bugs item #808596, was opened at 2003-09-18 15:48 Message generated for change (Settings changed) made by mwh You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=105470&aid=808596&group_id=5470
Category: None Group: Python 2.3 Status: Open Resolution: Later Priority: 2 Submitted By: Michael Hudson (mwh) Assigned to: Nobody/Anonymous (nobody) >Summary: apparently leaking snippet Initial Comment: Raymond Hettinger found that the following: fd, fname = tempfile.mkstemp() execfile(fname) leaks a reference. TrackRefs sez it's a string. Haven't dug any further. ---------------------------------------------------------------------- Comment By: Michael Hudson (mwh) Date: 2004-08-09 14:46 Message: Logged In: YES user_id=6656 Reopening, as it turned out interning filenames did do some good. Lowering priority as it isn't a real leak. It's still kinda annoying, though. ---------------------------------------------------------------------- Comment By: Michael Hudson (mwh) Date: 2004-08-03 11:25 Message: Logged In: YES user_id=6656 Done, in Python/compile.c revision 2.312. test_pkgimport turned out to be something else (sys.path_importer_cache), so I feel no need to try and be clever with dummy's refcounting today. ---------------------------------------------------------------------- Comment By: Raymond Hettinger (rhettinger) Date: 2004-08-02 16:11 Message: Logged In: YES user_id=80475 Not interning the filename seems cleanest. Like you, I do not expect that interning provided any real benefit here. ---------------------------------------------------------------------- Comment By: Michael Hudson (mwh) Date: 2004-08-02 13:56 Message: Logged In: YES user_id=6656 I've finally worked out what's going on here. It's because compiling the file interns the name of the file being compiled. Now that interned strings are mortal, this isn't a big deal, but it still results in a string being added to and removed from the interned strings dictionary with net result (almost all of the time) of incrementing the refcount on 'dummy' by one. Once in every thousand or so iterations this results in the interned string dictionary being resized and throwing all the references to dummy away, so this isn't a 'real' leak. OTOH, I'd still like to do something about this (as is, test_pkg appears to leak 10 references per run because of this). The simplest thing would be to just plain not intern the filename during compilation (I find it hard to believe that it's of any real benefit). The more invasive solution would be to not do refcounting on dummy (assuming that's even possible) which is a scarier change, but would stop similar problems with other tests (I have a feeling that test_pkgimport appears to be leaking references because of a different incarnation of the same problem). ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=105470&aid=808596&group_id=5470 _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
