Messages in this thread | | | Date | Fri, 12 Dec 2003 00:30:07 +1100 | From | Nick Piggin <> | Subject | Re: [CFT][RFC] HT scheduler |
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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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