Re: [CFT][RFC] HT scheduler

William Lee Irwin III
2003-12-11T13:33:43Z

William Lee Irwin III wrote:
>> 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.

On Fri, Dec 12, 2003 at 12:30:07AM +1100, Nick Piggin wrote:
> 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.

Volano is all one process address space so it could be ->page_table_lock;
any chance you could find which spin_lock() call the pounded chunk of the
lock section jumps back to?

-- wli