Message 292235 - Python tracker

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In-reply-to
Author	serhiy.storchaka
Recipients	orent, serhiy.storchaka, vstinner
Date	2017年04月24日.18:55:59
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1493060159.65.0.375482277072.issue30156@psf.upfronthosting.co.za>

Content
The regression was added by the fix for issue26811. PR 1272 applies the alternate patch from issue26811. This doesn't harm the performance. $ ./python.patched -m perf timeit -q --compare-to ./python.default -s "from collections import namedtuple; P = namedtuple('P', 'x y'); p = P(1, 2)" --duplicate 1000 "p.x" Mean +- std dev: [python.default] 128 ns +- 7 ns -> [python.patched] 121 ns +- 7 ns: 1.05x faster (-5%) I thought about tests, but I don't know what is the best place for them. Seems other environment variables that controls debug output are not tested too.

Content

The regression was added by the fix for issue26811. PR 1272 applies the alternate patch from issue26811. This doesn't harm the performance.
$ ./python.patched -m perf timeit -q --compare-to ./python.default -s "from collections import namedtuple; P = namedtuple('P', 'x y'); p = P(1, 2)" --duplicate 1000 "p.x"
Mean +- std dev: [python.default] 128 ns +- 7 ns -> [python.patched] 121 ns +- 7 ns: 1.05x faster (-5%)
I thought about tests, but I don't know what is the best place for them. Seems other environment variables that controls debug output are not tested too.

History
Date	User	Action	Args
2017年04月24日 18:55:59	serhiy.storchaka	set	recipients: + serhiy.storchaka, vstinner, orent
2017年04月24日 18:55:59	serhiy.storchaka	set	messageid: <1493060159.65.0.375482277072.issue30156@psf.upfronthosting.co.za>
2017年04月24日 18:55:59	serhiy.storchaka	link	issue30156 messages
2017年04月24日 18:55:59	serhiy.storchaka	create

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