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").
Those haven't been ported to the new API, yet. Consider, for example, d9821affc9ee. Before that, I got 253 MB/s on the 4096 units read test; with that change, I get 610 MB/s. The trunk gives me 488 MB/s, so this is a 25% speedup for PEP 393. Regards, Martin _______________________________________________ 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
