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Subject: Re: [Lse-tech] 7.52 second kernel compile
From: Daniel Egger <degger@fhm.edu>
To: "Martin J. Bligh" <Martin.Bligh@us.ibm.com>
Cc: linux-kernel@vger.kernel.org
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Date: 16 Mar 2002 19:57:32 +0100
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Am Sam, 2002-03-16 um 18.37 schrieb Martin J. Bligh:

> BTW - the other tip that was in the big book of whizzy kernel
> compiles was to set gcc to use -pipe ... you might want to try
> that.

Interestingly -pipe doesn't give any measurable performance increases or
even leads to a minor decrease in compile speed in my latest tests on
bigger projects like the linux kernel or GIMP. I suspect that's because
of the caching nature of nowadays systems: the temporary products are
cached in memory and likely not to never end on a drive because they're
read and removed before the point the filesystem decides to physically
write the data.

I also benchmarked tmpfs mounts and it demonstrated - to my surprise -
small advantages slightly above the noise range; I suspect this is due
to the way it handles files in memory.
 
-- 
Servus,
       Daniel

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