2009/1/28 Antoine Pitrou <solip...@pitrou.net>: > Paul Moore <p.f.moore <at> gmail.com> writes: >> >> It would be helpful to limit this cost as much as possible - maybe >> that's simply ensuring that the default encoding for open is (in the >> majority of cases) a highly-optimised one whose costs *don't* dominate >> in the way you describe > > As I pointed out, utf-8, utf-16 and latin1 decoders have already been > optimized > in py3k. For *pure ASCII* input, utf-8 decoding is blazingly fast (1GB/s > here). > The dataset for iobench isn't pure ASCII though, and that's why it's not as > fast.
Ah, thanks. Although you said your data was 95% ASCII, and you're getting decode speeds of 250MB/s. That's 75% slowdown for 5% of the data! Surely that's not right??? > People are invited to test their own workloads with the io-c branch and report > performance figures (and possible bugs). There are so many possibilities that > the benchmark figures given by a generic tool can only be indicative. At the moment, I don't have the time to download and build the branch, and in any case as I only have Visual Studio Express, I don't get the PGO optimisations, making any tests I do highly suspect. Paul. PS Can anyone comment on why Python defaults to utf-8 on Windows? That seems like a highly suspect default... _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
