28 Jan
2009
28 Jan
'09
12:30 a.m.
On Tue, Jan 27, 2009 at 6:15 PM, Antoine Pitrou
It's some arbitrary text composed of 95% ASCII characters and 5% non-ASCII. On this specific example, utf8 decodes at around 250 MB/s, latin1 at almost 1 GB/s (on the same machine on which I ran the benchmarks).
For the "10MB whole contents at once" test, we then have: (assuming the code does no pipelining of disk I/O with decoding) 10MB / 980MB/s to read from disk = 10 ms 10MB / 250MB/s to decode to utf8 = 40 ms 10MB / (10ms + 40ms) = 200 MB/s In practice, your results shows around 90 MB/s. That's at least vaguely in the same ballpark. -- Daniel Stutzbach, Ph.D. President, Stutzbach Enterprises, LLC http://stutzbachenterprises.com