Mark Shannon <ma...@dcs.gla.ac.uk> added the comment: Please reopen this bug as the fix is wrong.
This fix merely hides the symptoms of _PyType_Lookup returning a dead object, by calling PyType_Modified() frequently, thus ensuring the type method cache is almost always invalidated. This results in a significant slow down in pystones (~4%) due to a large slowdown (~60%) in _PyType_Lookup. I don't know what the root cause is, but it could be: A failure to call PyType_Modified() at the correct point (probably somewhere in iobase.c) or it could be: Deallocation not conforming to topographical ordering (ie. instance first then class), due to a cycle involving a borrowed reference. (Or it could be something else) ---------- nosy: +Mark.Shannon _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue12149> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
