[Python-Dev] PEP 393 review

Sun Aug 28 22:23:42 CEST 2011

Am 28.08.2011 22:01, schrieb Antoine Pitrou:
>>> - the iobench results are between 2% acceleration (seek operations),
>> 16% slowdown for small-sized reads (4.31MB/s vs. 5.22 MB/s) and
>> 37% for large sized reads (154 MB/s vs. 235 MB/s). The speed
>> difference is probably in the UTF-8 decoder; I have already
>> restored the "runs of ASCII" optimization and am out of ideas for
>> further speedups. Again, having to scan the UTF-8 string twice
>> is probably one cause of slowdown.
>> I don't think it's the UTF-8 decoder because I see an even larger
> slowdown with simpler encodings (e.g. "-E latin1" or "-E utf-16le").

But those aren't used in iobench, are they?
Regards,
Martin