linux-kernel - Re: [PATCH v4 0/6] sched: use runnable load based balance

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Date:	Fri, 03 May 2013 16:54:27 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	mingo@...hat.com, tglx@...utronix.de, akpm@...ux-foundation.org,
	arjan@...ux.intel.com, bp@...en8.de, pjt@...gle.com,
	namhyung@...nel.org, efault@....de, morten.rasmussen@....com,
	vincent.guittot@...aro.org, gregkh@...uxfoundation.org,
	preeti@...ux.vnet.ibm.com, viresh.kumar@...aro.org,
	linux-kernel@...r.kernel.org, len.brown@...el.com,
	rafael.j.wysocki@...el.com, jkosina@...e.cz,
	clark.williams@...il.com, tony.luck@...el.com,
	keescook@...omium.org, mgorman@...e.de, riel@...hat.com
Subject: Re: [PATCH v4 0/6] sched: use runnable load based balance

On 05/03/2013 03:55 PM, Alex Shi wrote:
> Just find a benchmark named as pthread_cond_broadcast. 
> http://kristiannielsen.livejournal.com/13577.html. will play with it. :)
>> > 

I tried the pthread_cond_broadcast with/without my latest patchset,
seems no clear performance change.
 without the patch, finished 30000 threads need 0.39 ~ 0.49 seconds in
ten times testing,
 with the patch, finished 30000 thread need 0.38 ~ 0.47 seconds in ten
times testing.

I try to give more threads in testing, but when thread number increased
to 40000, the testing become extremely slow and gdb find it busy on
thread creating.


[New Thread 0x7fe470411700 (LWP 24629)]
[New Thread 0x7fe470512700 (LWP 24628)]
[New Thread 0x7fe470613700 (LWP 24627)]
[New Thread 0x7fe470714700 (LWP 24626)]



-- 
Thanks
    Alex
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