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SubjectRe: Nick's scheduler v16 - reaim


Cliff White wrote:

>>
>>
>>>>I'm starting to do some large SMP / NUMA testing. Fixed and changed quite
>>>>a bit. It isn't too bad, although I'm only testing dbench, tbench, and
>>>>volanomark at the moment.
>>>>
>>>>These SMP and NUMA changes are not tied to my interactivity stuff, so its
>>>>possible they could get included if they turn out well. If you find any
>>>>problems with it (high end or interactivity), please let me know.
>>>>
>>>>
>
>Results from reaim aren't encouraging.
>patch was applied against 2.6.0-test8 - the result
>is PLM #2232
>
>STP id kernal name Max JPM Max User Pct elevator
>281932 nick_v16 4923.08 60 0.00 AS
>281933 nick_v16 5196.06 68 5.54 deadline
>281722 linux-2.6.0-test8 5432.77 92 9.38 deadline
>281792 2.6.0-test8-mm1 5384.41 92 8.56 deadline
>281790 2.6.0-test8-mm1 5392.65 88 8.7 AS
>
>The kernel doesn't perform well at larger user numbers.
>Notice the different in max users.
>Compare the graphs for jobs per minute, the usual graph
>is quite flat, see:
>http://khack.osdl.org/stp/281932/results/jpm.png
>
>With the v16 scheduler, jobs per minute falls off rapidly
>as user number increases giving graph with a steep slope,
>not good.
>http://khack.osdl.org/stp/281790/results/jpm.png
>Further results: http://www.developer.osdl.org/reaim/index.html
>

Hi Cliff,

Yeah, unfortunately this graph has been a feature of my scheduler for
quite a while :( I think it is caused either by too much balancing
or timeslices getting too small because there are a lot of threads
blocking. Anyway, if you had the time to test this one would be really
good.

http://www.kerneltrap.org/~npiggin/v16/sched-rollup-nopolicy-v16.gz

Nick

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