New submission from Raymond Hettinger: The Modules/_randommodule.c implements the 32-bit version of the MersenneTwister and its struct uses (unsigned long) for each of the 624 elements of the state vector.
On a 32-bit build, the unsigned longs are 4 bytes. However, on a 64-bit build, they are 8 bytes each eventhough only the bottom 32-bits are used. This causes the random object to be twice as big as necessary. sys.getsizeof(_random.Random()) reports 5016 bytes. This wastes memory, grinds the cache, and slows performance. The (unsigned long) declaration should probably be replaced with (uint32_t). ---------- assignee: rhettinger messages: 236262 nosy: rhettinger, serhiy.storchaka priority: normal severity: normal status: open title: Random objects twice as big as necessary on 64-bit builds type: resource usage versions: Python 2.7, Python 3.4, Python 3.5 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue23488> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
