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From: Steven Cole <scole@lanl.gov>
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Date: Tue, 12 Dec 2000 15:09:02 -0700
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Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>, linux-kernel@vger.kernel.org
To: Linus Torvalds <torvalds@transmeta.com>
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Subject: Re: UP 2.2.18 makes kernels 3% faster than UP 2.4.0-test12
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On Tuesday 12 December 2000 13:38, Linus Torvalds wrote:
> On Tue, 12 Dec 2000, Steven Cole wrote:
> > Task: make -j3 bzImage for 2.4.0-test12-pre7 kernel tree.
>
> Actually, do it with
>
> 	make -j3 'MAKE=make -j3' bzImage
>
> A single "-j3" won't do much. It will only build three directories at a
> time, and you'll never see much load. But doing it recursively means that
> you'll build three at a time all the way out to the leaf directories, and
> you should see loads up to 20+, and much more memory pressure too.
>
> 		Linus

Ok, repeated the tests with make -j3 'MAKE=make -j3' bzImage

I ran xosview to monitor the load.

The load values for 2.2.18 seemed to stay higher longer than
for 2.4.0-test12. I recorded the peak load observed.

For comparison, with make -j3 bzImage, the peak load was much
lower, about 2.7.

Task: make -j3 'MAKE=make -j3' bzImage for 2.4.0-test12-pre7 kernel tree.
Numbers are seconds to build.
New results:

 1       2       3      ave.
143     143     143     143     Running 2.2.18 SMP
19.1    17.5    19.2    18.6    Max load observed with xosview

142     141     141     141.3   Running 2.4.0-test12-pre7 SMP
16.2    16.8    15.2    16.1    Max load observed with xosview

Steven
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