Re: [CFT][RFC] HT scheduler

William Lee Irwin III
2003-12-11T11:53:54Z

On Thu, Dec 11, 2003 at 07:57:31PM +1100, Nick Piggin wrote:
> 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?
> 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%
> __wake_up 1.1% 1.3%
> futex_wait 0.7% 2.8%
> futex_wake 0.7% 0.5%
> .text.lock.dev 0.6% 0.2%
> rwsem_down_read_failed 0.5%
> unqueue_me 3.2%

If this thing is heavily threaded, it could be mm->page_table_lock.

-- wli