Message 167977 - Python tracker

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In-reply-to
Author	pitrou
Recipients	ezio.melotti, pitrou, vstinner
Date	2012年08月11日.16:19:35
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1344701976.45.0.978427314848.issue15612@psf.upfronthosting.co.za>

Content
> _PyUnicodeWriter is almost always faster Actually, PyAccu is consistently faster for the "writer" case, while _PyUnicodeWriter is faster for the "writer-reader" case. This is not because of PyAccu, but because of the way StringIO uses it: when e.g. readline() is called, the PyAccu result is converted into a PyUCS4* buffer, then each readline() result is converted again by finding the max char in the sub-buffer. So I would suggest using PyAccu, but converting its result to a _PyUnicodeWriter rather than a PyUCS4* buffer.

Content

> _PyUnicodeWriter is almost always faster
Actually, PyAccu is consistently faster for the "writer" case, while _PyUnicodeWriter is faster for the "writer-reader" case.
This is not because of PyAccu, but because of the way StringIO uses it: when e.g. readline() is called, the PyAccu result is converted into a PyUCS4* buffer, then each readline() result is converted again by finding the max char in the sub-buffer.
So I would suggest using PyAccu, but converting its result to a _PyUnicodeWriter rather than a PyUCS4* buffer.

History
Date	User	Action	Args
2012年08月11日 16:19:36	pitrou	set	recipients: + pitrou, vstinner, ezio.melotti
2012年08月11日 16:19:36	pitrou	set	messageid: <1344701976.45.0.978427314848.issue15612@psf.upfronthosting.co.za>
2012年08月11日 16:19:35	pitrou	link	issue15612 messages
2012年08月11日 16:19:35	pitrou	create

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