Message 157614 - Python tracker

➜

This issue tracker has been migrated to GitHub, and is currently read-only.
For more information, see the GitHub FAQs in the Python's Developer Guide.

Author	skrah
Recipients	benjamin.peterson, pitrou, python-dev, serhiy.storchaka, skrah, vstinner
Date	2012-04-05.20:03:55
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<20120405200355.GA19303@sleipnir.bytereef.org>
In-reply-to	<1333655183.56.0.678322448275.issue14249@psf.upfronthosting.co.za>

Content
On 64-bit Linux with gcc-4.4 I get: Unpatched: $ ./python -m timeit -s 'import codecs; d = codecs.utf_16_be_decode; x = (" " * 1000).encode("utf-16be")' 'd(x)' 100000 loops, best of 3: 4.1 usec per loop $ ./python -m timeit -s 'import codecs; d = codecs.utf_16_be_decode; x = ("\u263A" * 1000).encode("utf-16be")' 'd(x)' 100000 loops, best of 3: 5.87 usec per loop 2c514c382a2a: $ ./python -m timeit -s 'import codecs; d = codecs.utf_16_be_decode; x = (" " * 1000).encode("utf-16be")' 'd(x)' 100000 loops, best of 3: 3.68 usec per loop $ ./python -m timeit -s 'import codecs; d = codecs.utf_16_be_decode; x = ("\u263A" * 1000).encode("utf-16be")' 'd(x)' 100000 loops, best of 3: 4.72 usec per loop utf16_decoder_shift_3.patch: $ ./python -m timeit -s 'import codecs; d = codecs.utf_16_be_decode; x = (" " * 1000).encode("utf-16be")' 'd(x)' 100000 loops, best of 3: 2.23 usec per loop $ ./python -m timeit -s 'import codecs; d = codecs.utf_16_be_decode; x = ("\u263A" * 1000).encode("utf-16be")' 'd(x)' 100000 loops, best of 3: 3.11 usec per loop

On 64-bit Linux with gcc-4.4 I get:

Unpatched:

$ ./python -m timeit -s 'import codecs; d = codecs.utf_16_be_decode; x = (" " * 1000).encode("utf-16be")' 'd(x)'
100000 loops, best of 3: 4.1 usec per loop
$ ./python -m timeit -s 'import codecs; d = codecs.utf_16_be_decode; x = ("\u263A" * 1000).encode("utf-16be")' 'd(x)'
100000 loops, best of 3: 5.87 usec per loop

2c514c382a2a:

$ ./python -m timeit -s 'import codecs; d = codecs.utf_16_be_decode; x = (" " * 1000).encode("utf-16be")' 'd(x)'
100000 loops, best of 3: 3.68 usec per loop
$ ./python -m timeit -s 'import codecs; d = codecs.utf_16_be_decode; x = ("\u263A" * 1000).encode("utf-16be")' 'd(x)'
100000 loops, best of 3: 4.72 usec per loop

utf16_decoder_shift_3.patch:

$ ./python -m timeit -s 'import codecs; d = codecs.utf_16_be_decode; x = (" " * 1000).encode("utf-16be")' 'd(x)'
100000 loops, best of 3: 2.23 usec per loop
$ ./python -m timeit -s 'import codecs; d = codecs.utf_16_be_decode; x = ("\u263A" * 1000).encode("utf-16be")' 'd(x)'
100000 loops, best of 3: 3.11 usec per loop

History
Date	User	Action	Args
2012-04-05 20:03:56	skrah	set	recipients: + skrah, pitrou, vstinner, benjamin.peterson, python-dev, serhiy.storchaka
2012-04-05 20:03:55	skrah	link	issue14249 messages
2012-04-05 20:03:55	skrah	create