Re: [CFT][RFC] HT scheduler

Nick Piggin
2003-12-12T08:59:33Z

Nick Piggin wrote:

>
> w26 does ALL this, while sched.o is 3K smaller than Ingo's shared
> runqueue
> patch on NUMA and SMP, and 1K smaller on UP (although sched.c is 90 lines
> longer). kernbench system time is down nearly 10% on the NUMAQ, so it
> isn't
> hurting performance either.

Hackbench performance on the NUMAQ is improved by nearly 50% at large
numbers of tasks due to a better scaling factor (which I think is slightly
"more" linear too). It is also improved by nearly 25% (4.08 vs 3.15) on
OSDLs 8 ways at small number of tasks, due to a better constant factor.

http://www.kerneltrap.org/~npiggin/w26/hbench.png

And yeah hackbench kills the NUMAQ after about 350 rooms. This is due to
memory shortages. All the processes are getting stuck in shrink_caches,
get_free_pages, etc.