New submission from Yury Selivanov <yseliva...@gmail.com>: asyncio.Task now uses asyncio.iscoroutine() to give a comprehensible error if a user creates a Task for a non-awaitable type.
The problem is that iscoroutine() is quite expensive for non-native coroutines (like the ones compiled with Cython), as it uses `isinstance(obj, collections.abc.Coroutine)` call. This makes 'loop.create_task(cython_coroutine)' 20% slower than 'loop.create_task(python_coroutine)'. The PR adds a positive type cache to the iscoroutine() function and to the asyncio.Task C implementation. Both caches make 'loop.create_task()' equally fast for all kinds of coroutines. ---------- components: asyncio messages: 308515 nosy: asvetlov, yselivanov priority: normal severity: normal status: open title: Optimize asyncio.iscoroutine() for non-native coroutines versions: Python 3.7 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue32357> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
