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    SubjectRe: [CFT][RFC] HT scheduler


    William Lee Irwin III wrote:

    >William Lee Irwin III wrote:
    >
    >>>If this thing is heavily threaded, it could be mm->page_table_lock.
    >>>
    >
    >On Fri, Dec 12, 2003 at 12:09:04AM +1100, Nick Piggin wrote:
    >
    >>I'm not sure how threaded it is, probably very. Would inline spinlocks
    >>help show up mm->page_table_lock?
    >>It really looks like .text.lock.futex though, doesn't it? Would that be
    >>the hashed futex locks? I wonder why it suddenly goes downhill past about
    >>140 rooms though.
    >>
    >
    >It will get contention anyway if they're all pounding on the same futex.
    >OTOH, if they're all threads in the same process, they can hit other
    >problems. I'll try to find out more about hackbench.
    >


    Oh, sorry I was talking about volanomark. hackbench AFAIK doesn't use
    futexes at all, just pipes, and is not threaded at all, so it looks like
    a different problem to the volanomark one.

    hackbench runs into trouble at large numbers of tasks too though.


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