Message 280256 - Python tracker

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In-reply-to
Author	vstinner
Recipients	ethan.furman, vstinner
Date	2016年11月07日.23:08:21
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1478560101.77.0.456510195055.issue28637@psf.upfronthosting.co.za>

Content
The changeset 223731925d06 of the issue issue #28082 "use IntFlag for re constants" made Python startup 34% slower: - rev 5637c9b4dd4c: Median +- std dev: 19.5 ms +- 0.0 ms - rev 223731925d06: Median +- std dev: 26.2 ms +- 0.0 ms The change adds "import enum" in Lib/re.py, so the enum module is imported, whereas it wasn't before. It seems like importing enum takes 6.7 ms. I propose to revert the change 223731925d06 in Python 3.6 and reopen the issue #28082 to try to find another solution for the re module which doesn't impact Python startup performance.

Content

The changeset 223731925d06 of the issue issue #28082 "use IntFlag for re constants" made Python startup 34% slower:
- rev 5637c9b4dd4c: Median +- std dev: 19.5 ms +- 0.0 ms
- rev 223731925d06: Median +- std dev: 26.2 ms +- 0.0 ms
The change adds "import enum" in Lib/re.py, so the enum module is imported, whereas it wasn't before. It seems like importing enum takes 6.7 ms.
I propose to revert the change 223731925d06 in Python 3.6 and reopen the issue #28082 to try to find another solution for the re module which doesn't impact Python startup performance.

History
Date	User	Action	Args
2016年11月07日 23:08:21	vstinner	set	recipients: + vstinner, ethan.furman
2016年11月07日 23:08:21	vstinner	set	messageid: <1478560101.77.0.456510195055.issue28637@psf.upfronthosting.co.za>
2016年11月07日 23:08:21	vstinner	link	issue28637 messages
2016年11月07日 23:08:21	vstinner	create

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