Re: [PATCH 2.6.20-rc4 0/4] futexes functionalities and improvements

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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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