New submission from STINNER Victor: This issue tracks changes to support the "fast call" calling convention in functions:
* PyObject_CallFunctionObjArgs() * PyObject_CallMethodObjArgs() * _PyObject_CallMethodIdObjArgs() A "stack" of Python objects is created to pass arguments to _PyObject_FastCall(). The goal is to avoid the creation of a temporary tuple to call functions. The patch serie changes slots (typeobject.c), so calling Python slots from Python should avoid completely the creation of temporary tuples to pass parameters. Microbenchmark on a simple class with an __int__() method, call int(o): int(o): Median +- std dev: [ref] 239 ns +- 13 ns -> [patch] 219 ns +- 14 ns: 1.10x faster (-9%) Microbenchmark on a simple class with an __getitem__() method, call o[100]: o[100]: Median +- std dev: [ref] 211 ns +- 11 ns -> [patch] 172 ns +- 11 ns: 1.23x faster (-19%) Comparison between Python 2.7, 3.5, 3.7 and 3.7+patch, 3.5 is used as the reference: int(o) ====== Median +- std dev: [3.5] 271 ns +- 15 ns -> [3.7] 239 ns +- 13 ns: 1.13x faster (-12%) Median +- std dev: [3.5] 271 ns +- 15 ns -> [patch] 219 ns +- 14 ns: 1.24x faster (-19%) Median +- std dev: [3.5] 271 ns +- 15 ns -> [2.7] 401 ns +- 21 ns: 1.48x slower (+48%) o[100] ====== Median +- std dev: [3.5] 206 ns +- 5 ns -> [3.7] 211 ns +- 11 ns: 1.02x slower (+2%) Not significant! Median +- std dev: [3.5] 206 ns +- 5 ns -> [patch] 172 ns +- 11 ns: 1.20x faster (-17%) Median +- std dev: [3.5] 206 ns +- 5 ns -> [2.7] 254 ns +- 15 ns: 1.23x slower (+23%) ---------- messages: 282748 nosy: haypo priority: normal severity: normal status: open title: Modify PyObject_CallFunction() to use fast call internally type: performance versions: Python 3.7 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue28915> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
