New submission from Yury Selivanov: The attached patch implements a free-list for single-digit longs. We already have free lists for many fundamental types, such as floats & unicode.
The patch improves performance in micro-benchmarks by 10-20%. It'll also lessen memory fragmentation issues. == Benchmarks == ### spectral_norm ### Min: 0.268018 -> 0.245042: 1.09x faster Avg: 0.289548 -> 0.257861: 1.12x faster Significant (t=18.82) Stddev: 0.01004 -> 0.00640: 1.5680x smaller -m timeit -s "loops=tuple(range(1000))" "for x in loops: x+x" with patch: 34.5 usec without patch: 45.9 usec == Why only single-digit? == I've also a patch that implements free-lists for 1-digit, 2-digits and 3-digits longs, and collects statistics on them. It looks like we only want to optimize 1-digit longs: * 2to3 benchmark (the first number is the number of all N-digit longs, the second number is the number of longs created via free-list): ===> d1_longs = 142384 124759 ===> d2_longs = 6872 6264 ===> d3_longs = 2907 2834 * richards: ===> d1_longs = 219630 219033 ===> d2_longs = 1455 1096 ===> d3_longs = 630 627 * spectral_norm: ===> d1_longs = 133928432 133927838 ===> d2_longs = 1471 1113 ===> d3_longs = 630 627 ---------- assignee: yselivanov components: Interpreter Core files: long_fl.patch keywords: patch messages: 260124 nosy: haypo, mark.dickinson, serhiy.storchaka, yselivanov priority: normal severity: normal stage: patch review status: open title: Implement free-list for single-digit longs type: performance versions: Python 3.6 Added file: http://bugs.python.org/file41900/long_fl.patch _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue26341> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com