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To: Andrew Morton <akpm@osdl.org>
cc: Cliff White <cliffw@osdl.org>, linux-kernel@vger.kernel.org,
       Ingo Molnar <mingo@elte.hu>
Subject: Re: 2.6.0-test2-mm3 osdl-aim-7 regression 
In-Reply-To: Message from Andrew Morton <akpm@osdl.org> 
   of "Tue, 05 Aug 2003 22:23:54 PDT." <20030805222354.66dbdb8d.akpm@osdl.org> 
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Date: Wed, 06 Aug 2003 12:10:34 -0700
From: Cliff White <cliffw@osdl.org>
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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.

[Rant response]
For a short test run, you can run a small number of iterations like this:
./reaim -s2 -e10 -i2 -f./workfile.new_dbase

( 2->10 users, increment by 2)

That takes about 5 minutes on our 4-way.

Or, run one iteration with a large user count:

./reaim -s25 -e25 -f ./workifile.foo

cliffw


> 
> 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
> 
> 
>