linux-kernel - Re: Help Resource Counters Scale better (v4)

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Message-ID: <4A818C7D.7010307@redhat.com>
Date:	Tue, 11 Aug 2009 11:21:33 -0400
From:	Prarit Bhargava <prarit@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	balbir@...ux.vnet.ibm.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	"menage@...gle.com" <menage@...gle.com>, andi.kleen@...el.com,
	Pavel Emelianov <xemul@...nvz.org>,
	"lizf@...fujitsu.com" <lizf@...fujitsu.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: Help Resource Counters Scale better (v4)



Andi Kleen wrote:
> Prarit Bhargava <prarit@...hat.com> writes:
>   
>> On a 64p/32G system running 2.6.31-git2-rc5, with RESOURCE_COUNTERS
>>     
>
> This is CONFIG_RESOURCE_COUNTERS off at compile time right?
>
>   
>> off, "time make -j64" results in
>>     

^^^ yes.  It is off.

>> real    4m54.972s
>> user    90m13.456s
>> sys     50m19.711s
>>
>> On the same system, running 2.6.31-git2-rc5, with RESOURCE_COUNTERS on,
>> plus Balbir's "Help Resource Counters Scale Better (v3)" patch, and
>> this patch, results in
>>
>> real    4m18.607s
>> user    84m58.943s
>> sys     50m52.682s
>>     
>
> Hmm, so resource counters on with the patch is faster than
> CONFIG_RESOURCE_COUNTERS compiled out in real time? That seems
> counterintuitive. At best I would expect the patch to break even, but
> not be actually faster.
>   

That is only after one run.  I'm doing 10 reboot and build runs right 
now and will average them out.  I'll ping back here with results.

>
> Still it looks like the patch is clearly needed.
>
>   

P.
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