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    SubjectRe: [2.4.17/18pre] VM and swap - it's really unusable
    On Fri, 11 Jan 2002, Mark Hahn wrote:

    > > overall performance seems far lower. For instance, without the patch
    > > the -j build finishes in ~10 minutes (2x933P3/256MB) but with the patch
    > please, PLEASE stop using "make -j"
    > for anything except the fork-bomb that it is.
    > pretending that it's a benchmark, especially one
    > to guide kernel tuning, is a travesty!

    Actually, it's as good a benchmark as any. Knowing
    how well the system is able to recover from heavy
    overload situations is useful to know if your
    server gets heavily overloaded at times.

    If one VM falls over horribly under half the load
    it takes to make another VM go slower, I know which
    one I'd want on my server.

    > if you want to simulate VM load, so something sane like
    > boot with mem=32M, or a simple "mmap(lots); mlockall" tool.

    ... and then you come up with something WAY less
    realistic than 'make -j' ;)))


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    -- Microsoft's "Competing with Linux" document

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