ULE vs. 4BSD in RELENG_7

gnn at freebsd.org gnn at freebsd.org
Wed Oct 24 06:49:30 PDT 2007

At Tue, 23 Oct 2007 21:06:39 -0400,
Josh Carroll wrote:
> I decided to do some testing of concurrent processes (rather than a
> single process that's multi-threaded). Specifically, I ran 4 ffmpeg
> (without the -threads option) commands at the same time. The
> difference was less than a percent:
> 4bsd:   439.92 real      1755.91 user         1.08 sys
> ule:      442.10 real      1754.65 user         1.34 sys
> The difference in user/sys is slight, but there. Not sure if that's
> pertinent, though, given it is such a small percentage.
> I also ran the same scenario with mencoder, with similar results:
> 4bsd:   377.96 real      1501.58 user         2.04 sys
> ule:      377.50 real      1501.68 user         1.93 sys
> I think this is important, as it shows an N-process workload on an
> N-processor system is the same between ULE and 4BSD, while a single
> process (N-threads) workload on an N-processor system seems to favor
> 4BSD (at least for media encoding). I'm still unsure why MySQL is so
> much better with ULE, given these results.
> Again, hope this information is useful!

First of all, yes it is and thanks for doing all this.

Second, the person who has been working on ULE is moving house so may
not respond for a bit, so don't worry, you're work is not being


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