ULE vs. 4BSD in RELENG_7

[gnn at freebsd.org]

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
ignored.

Best,
George