Messages in this thread | | | Date | Wed, 1 Jan 2003 11:05:50 -0500 (EST) | From | Bill Davidsen <> | Subject | Re: Impact of scheduler tunables on interactive response (was Re: [BENCHMARK] scheduler tunables with contest - prio_bonus_ratio) |
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On Wed, 1 Jan 2003, scott thomason wrote:
> I wrote a program that emulates a varying but constant set of loads > with a fixed amount of sleep() time in the hopes that it would appear > "interactive" to the estimator. The program measures the time it > takes to process each iteration (minus the time it spends sleeping). > Then I tried seven different configurations of the tunables while the > system was under load. The kernel was 2.5.53-mm2. The load was a > continuously looping kernel make -j4 clean/make -j4 bzImage, and a > continuously looping copy of a 100MB file. My system is a dual AMD > MP2000 with 1GB RAM.
This sounds very like my resp2 (www.unyuug.org/benchmarks/) program I announced on this list some months ago, but resp2 generates loads of a specific type so that you can determine of changes affect i/o load, swapping load, CPU load, etc.
> > *IF* the test program is valid--something I would like feedback > on!--the results show that you can attack the background load with > aggressive tunable settings to achieve low interactive response > times, contrary to the direction Andrew had suggested taking for > tunable settings. > > The seven tunable configurations, a graph of the results, and the raw > data are here: > > http://www.thomasons.org/int_res.html > > Tab-delimited text and OpenOffice spreadsheets of the data are here: > > http://www.thomasons.org/int_res.txt > http://www.thomasons.org/int_res.sxc > > I would like to assemble a small suite of tools that can be used to > measure the impact of kernel changes on interactive performance, > starting with Mark Hahn's/Andrew's "realfeel" microbenchmark and > moving up thru whatever else may be necessary to gauge real-life > impact. Your comments and direction are very welcome.
Note: the context switching benchmark is at the same URL. I have posted some output recently, haven't had a of feedback other than some folks mailing results to me without copying the list.
-- bill davidsen <davidsen@tmr.com> CTO, TMR Associates, Inc Doing interesting things with little computers since 1979.
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