Re: [CFT][PATCH] new scheduler policy

Roger Luethi
2003-08-22T15:13:18Z

On Fri, 22 Aug 2003 23:08:40 +1000, Nick Piggin wrote:
> >I timed a pathological benchmark from hell I've been playing with lately.
> >Three consecutive runs following a fresh boot. Time is in seconds:
> >
> >2.4.21 821 21 25
> >2.6.0-test3-mm1 724 946 896
> >2.6.0-test3-mm1-nick 905 987 997
> >
> >Runtime with ideal scheduling: < 2 seconds (we're thrashing).
> >
>
> Cool. Can you post the benchmark source please?

http://hellgate.ch/code/ploc/thrash.c

A parallel kernel build can generate some decent thrashing, too, but I
wanted a short and simple test case that conveniently provides the
information I need for both logging daemon and post processing tool.

Note: The benchmark could trivially be made more evil which would prevent
2.4.21 from finishing over 30 times faster (as it often does). I
intentionally left it they way it is.

While everybody seems to be working on interactivity, I am currently
looking at this corner case. This should be pretty much orthogonal to your
own work.

Roger