Messages in this thread | ![/](/images/icornerl.gif) | | Date | Thu, 23 Oct 2003 12:02:54 +1000 | From | Nick Piggin <> | Subject | Re: Nick's scheduler v16 - reaim |
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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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