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    SubjectRe: [CFT][RFC] HT scheduler
    Date
    In message <3FD8317B.4060207@cyberone.com.au> you write:
    >
    >
    > Nick Piggin wrote:
    >
    > >
    > > Don't ask me why it runs out of steam at 150 rooms. hackbench does
    > > something similar. I think it might be due to some resource running
    > > short, or a scalability problem somewhere else.
    >
    >
    > OK, it is spinning on .text.lock.futex. The following results are
    > top 10 profiles from a 120 rooms run and a 150 rooms run. The 150
    > room run managed only 24.8% the throughput of the 120 room run.
    >
    > Might this be a JVM problem?

    Not if hackbench is showing it.

    > I'm using Sun Java HotSpot(TM) Server VM (build 1.4.2_01-b06, mixed mode)
    >
    > ROOMS 120 150
    > PROFILES
    > total 100.0% 100.0%
    > default_idle 81.0% 66.8%
    > .text.lock.rwsem 4.6% 1.3%
    > schedule 1.9% 1.4%
    > .text.lock.futex 1.5% 19.1%

    Increase FUTEX_HASHBITS?

    Rusty.
    --
    Anyone who quotes me in their sig is an idiot. -- Rusty Russell.
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