Re: Interesting scheduling times - NOT

Justin A. Kolodziej (4wg7kolodzie@vmsb.csd.mu.edu)
Thu, 24 Sep 1998 14:09:20 -0500


> > > Larry McVoy writes:
> > > > : As I've already said, you're probably not seeing the variance because
> > > > : you don't run with RT priority.
> > > >
> > > > Been there, tried it, the results have very low variance:
> > > >
> > > > RT: 5.42 (5.52 5.47 5.43 5.42 5.42 5.42 5.42 5.41 5.40 5.40 5.39)
> > > > !RT: 4.65 (4.86 4.85 4.84 4.83 4.66 4.65 4.61 4.55 4.55 4.54 4.54)

> > > > With 10 background processes:
> > > >
> > > > RT: 11.04 (11.13 11.11 11.11 11.07 11.07 11.04 11.04 11.00 11.00 10.98 10.98)
> > > > !RT: 6.76 (6.99 6.80 6.79 6.79 6.76 6.76 6.75 6.51 6.49 6.48 6.47)
> > >
> > > Interesting.

Which benchmark outputs data in this fashion? I tried lmbench 1.1 but
nothing resembles this.

I've tried Mr. Gooch's original test and find very little overall
variance there either. Sure, there are a few outliers from time to
time, but most of the numbers are in the same general area. I intend to
do my own independent tests but need to know what the other benchmark
being used is. I'll post the results (much) later. I'll even attempt
(ha ha) to analyze for free, although my statistics goes little farther
than standard deviation. If only I knew how to do an x-bar chart and...
what's that other one?

Anyway, I thought the debate was origianally about context switching on
a PPro being slow compared to everything else. Guess _that_ argument is
long gone.

-- 
Easiest Color To Solve On A Rubik's Cube:
        Black.  Simply remove all the little colored stickers on the
cube, and each of side of the cube will now be the original color of
the plastic underneath -- black.  According to the instructions, this
means the puzzle is solved.
                -- Steve Rubenstein

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