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SubjectRe: [PATCH 2.6.20-rc4 0/4] futexes functionalities and improvements
Hi,

Ingo Molnar a écrit :
> yeah. As an alternative, it might be a good idea to pthread-ify
> hackbench.c - that should replicate the Volano workload pretty
> accurately. I've attached hackbench.c. (it's process based right now, so
> it wont trigger contended futex ops)

Ok, thanks. I've adapted your test, Ingo, and do some measures. (I've only
replaced fork with pthread_create, I didn't use condvar or barrier for the first
synchronization).
The modified hackbench is available here:

http://www.bullopensource.org/posix/pi-futex/hackbench_pth.c

I've run this bench 1000 times with pipe and 800 groups.
Here are the results:

Test1 - with simple list (i.e. without any futex patches)
=========================================================
Iterations=1000
Latency (s) min max avg stddev
26.67 27.89 27.14 0.19

Test2 - with plist (i.e. with only patch 1/4 as is)
===================================================
Iterations=1000
Latency (s) min max avg stddev
26.87 28.18 27.30 0.18

Test3 - with plist but all SHED_OTHER registered
with the same priority (MAX_RT_PRIO)
(i.e. with modified patch 1/4, patch not yet posted here)
=========================================================
Iterations=1000
Latency (s) min max avg stddev
26.74 27.84 27.16 0.18


--
Pierre
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