Re: ULE vs. 4BSD in RELENG_7

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
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