Messages in this thread | | | Date | Tue, 5 Aug 2003 22:23:54 -0700 | From | Andrew Morton <> | Subject | Re: 2.6.0-test2-mm3 osdl-aim-7 regression |
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Cliff White <cliffw@osdl.org> wrote: > > > I see 2.6.0-test2-mm4 is already in our queue, so this may be > Old News. ( serves me right for taking a weekend off ) > Performance of -mm3 falls off on the 4-cpu machines. > > 2-cpu ssytems > Kernel JPM > 2.6.0-test2-mm3 1313.53 > linux-2.6.0-test2 1320.68 (0.54 % +) > > 4-cpu systems > 2.6.0-test2-mm3 4824.96 > linux-2.6.0-test2 5381.20 ( 11.53 % + ) > > Full details at > http://developer.osdl.org/cliffw/reaim/index.html > code at > bk://developer.osdl.org/osdl-aim-7 >
OK, I can reproduce this on 4way.
Binary searching (insert gratuitous rant about benchmarks that take more than two minutes to complete) reveals that the slowdown is due to sched-2.6.0-test2-mm2-A3.
So mm4 with everthing up to but not including sched-2.6.0-test2-mm2-A3:
Max Jobs per Minute 1467.06 Max Jobs per Minute 1478.82 Max Jobs per Minute 1473.36
3853.55s user 264.31s system 370% cpu 18:31.95 total
After adding sched-2.6.0-test2-mm2-A3:
Max Jobs per Minute 1375.63 Max Jobs per Minute 1278.40 Max Jobs per Minute 1293.11
4416.70s user 275.61s system 374% cpu 20:53.58 total
A 10% regression there, mainly user time.
The test is:
- build bk://developer.osdl.org/osdl-aim-7
- cd src
- time ./reaim -s4 -q -t -i4 -f./workfile.new_dbase -r3 -b -l./reaim.config
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