[pypy-issue] [issue718] string.plit('\x00') takes 300% longer under pypy1.5 w/jit
Robert Collins
pypy-dev-issue at codespeak.net
Tue May 10 08:48:21 CEST 2011
New submission from Robert Collins <robertc at robertcollins.net>:
under cpython:
11:37 < lifeless> 3 0.000 0.000 0.280 0.093
journals.py:678(_tokens)
under pypy(1.5, 64-bit build, your official download)
11:38 < lifeless> 3 0.000 0.000 1.161 0.387
journals.py:678(_tokens)
_tokens is defined as
def _tokens():
return content.split('\x00')
content in the timed case is a 74MB bytestring consisting of \x00 separated fields;
the fields are highly redundant - for example one in 5 in the case that produced
this is 'add', another one in 5 is 'file', and the rest are 'dir', 'symlink' and
relative paths, and floats (as ascii). There are 3331176 fields
(len(content.split('\x00'))==3331176)
----------
effort: ???
messages: 2507
nosy: lifeless, pypy-issue
priority: bug
release: ???
status: unread
title: string.plit('\x00') takes 300% longer under pypy1.5 w/jit
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PyPy development tracker <pypy-dev-issue at codespeak.net>
<https://codespeak.net/issue/pypy-dev/issue718>
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