New submission from Sergey Fedoseev <fedoseev.ser...@gmail.com>:
There are several cases in CPython sources when PyList_AsTuple() is used with just created list and immediately after that this list is Py_DECREFed. This operation can be performed more effectively since refcount of items is not changed. For example it gives such speed-up for BUILD_TUPLE_UNPACK: Before: $ python -m perf timeit -s "l = [None]*10**6" "(*l,)" ..................... Mean +- std dev: 8.75 ms +- 0.10 ms After: $ python -m perf timeit -s "l = [None]*10**6" "(*l,)" ..................... Mean +- std dev: 5.41 ms +- 0.07 ms ---------- messages: 335901 nosy: sir-sigurd priority: normal severity: normal status: open title: add internal API function to effectively convert just created list to tuple type: performance versions: Python 3.8 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue36031> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
