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    SubjectRe: Scheduler ( was: Just a second ) ...

    On Tue, 18 Dec 2001, Mike Kravetz wrote:
    > On Tue, Dec 18, 2001 at 02:09:16PM +0000, Alan Cox wrote:
    > > The scheduler is eating 40-60% of the machine on real world 8 cpu workloads.
    > > That isn't going to go away by sticking heads in sand.
    > Can you be more specific as to the workload you are referring to?
    > As someone who has been playing with the scheduler for a while,
    > I am interested in all such workloads.

    Well, careful: depending on what "%" means, a 8-cpu machine has either
    "100% max" or "800% max".

    So are we talking about "we spend 40-60% of all CPU cycles in the
    scheduler" or are we talking about "we spend 40-60% of the CPU power of
    _one_ CPU out of 8 in the scheduler".

    Yes, 40-60% sounds like a lot ("Wow! About half the time is spent in the
    scheduler"), but I bet it's 40-60% of _one_ CPU, which really translates
    to "The worst scheduler case I've ever seen under a real load spent 5-8%
    of the machine CPU resources on scheduling".

    And let's face it, 5-8% is bad, but we're not talking "half the CPU power"


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