Ok, I managed to make a quick but working patch (sufficient to get working interpreter, it segfaults for extension modules). It uses the "ememoa" allocator (http://code.google.com/p/ememoa/) which seems a reasonable pool allocator. The patch: http://dpaste.org/K8en/. The main obstacle was that there isn't a single function/macro that can be used to initialize all PyObjects, so I had to initialize static PyObjects (mainly PyTypeObjects) by hand.
I used a naive quicksort algorithm as a benchmark: http://dpaste.org/qquh/ . The result is that after patching it runs 50% SLOWER. I profiled it and allocator methods used 35% time. So there is still 15% performance loss even if the allocator is poor. Anyway, I'd like to have working copy-on-write in CPython - in the presence of GIL I find it important to have multiprocess programs optimized (and I think it's a common idiom that a parent process prepares some big data structure, and child "worker" processes do some read-only quering). Artur _______________________________________________ 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
