Message 280552 - Python tracker

Message280552

Author	vstinner
Recipients	ethan.furman, gregory.p.smith, gvanrossum, ned.deily, python-dev, serhiy.storchaka, terry.reedy, vinay.sajip, vstinner, wolma
Date	2016-11-10.23:28:11
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1478820491.4.0.669105632628.issue28637@psf.upfronthosting.co.za>
In-reply-to

Content
Oh nice, python_startup benchmark at Nov 10 (rev at 8ebaa546a033) is now faster than python_startup at Feb 29 (rev dfeadfb4c8cc): new 16.8 ms, old 19.5. And it's much before when I opened the issue: 26.6 ms. Thanks. https://speed.python.org/timeline/#/?exe=4&ben=python_startup&env=1&revs=50&equid=off&quarts=on&extr=on The main difference is the removal of "import re" from Lib/site.py. If I added back "import re", python_startup comes back to 24.2 ms +- 0.0 ms. I understand that "import re" adds 7.4 ms. Any additional import has an important cost of python startup performance :-/

Content

Oh nice, python_startup benchmark at Nov 10 (rev at 8ebaa546a033) is now faster than python_startup at Feb 29 (rev dfeadfb4c8cc): new 16.8 ms, old 19.5. And it's much before when I opened the issue: 26.6 ms. Thanks.

https://speed.python.org/timeline/#/?exe=4&ben=python_startup&env=1&revs=50&equid=off&quarts=on&extr=on

The main difference is the removal of "import re" from Lib/site.py. If I added back "import re", python_startup comes back to 24.2 ms +- 0.0 ms. I understand that "import re" adds 7.4 ms. Any additional import has an important cost of python startup performance :-/

History
Date	User	Action	Args
2016-11-10 23:28:11	vstinner	set	recipients: + vstinner, gvanrossum, terry.reedy, gregory.p.smith, vinay.sajip, ned.deily, ethan.furman, python-dev, serhiy.storchaka, wolma
2016-11-10 23:28:11	vstinner	set	messageid: <1478820491.4.0.669105632628.issue28637@psf.upfronthosting.co.za>
2016-11-10 23:28:11	vstinner	link	issue28637 messages
2016-11-10 23:28:11	vstinner	create