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    SubjectRe: [Lse-tech] 7.52 second kernel compile
    On 16 Mar 2002, Daniel Egger wrote:

    > 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.

    Yes. Last time I tested, -pipe was _always_ a loser, and writing to
    swap was measurably faster than writing to fs.


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