linux-kernel - Re: [UPDATED][PATCH][mmotm] Help Root Memory Cgroup Resource Counters Scale Better (v5)

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Date:	Sat, 15 Aug 2009 16:26:44 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Balbir Singh <balbir@...ux.vnet.ibm.com>
Cc:	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"lizf@...fujitsu.com" <lizf@...fujitsu.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	"menage@...gle.com" <menage@...gle.com>, xemul@...nvz.org,
	prarit@...hat.com, andi.kleen@...el.com,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [UPDATED][PATCH][mmotm] Help Root Memory Cgroup Resource
	Counters Scale Better (v5)


* Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:

> * Ingo Molnar <mingo@...e.hu> [2009-08-13 10:35:24]:
> 
> > 
> > * Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:
> > 
> > > Without Patch
> > > 
> > >  Performance counter stats for '/home/balbir/parallel_pagefault':
> > > 
> > >   5826093739340  cycles                   #    809.989 M/sec
> > >    408883496292  instructions             #      0.070 IPC
> > >      7057079452  cache-references         #      0.981 M/sec
> > >      3036086243  cache-misses             #      0.422 M/sec
> > 
> > > With this patch applied
> > > 
> > >  Performance counter stats for '/home/balbir/parallel_pagefault':
> > > 
> > >   5957054385619  cycles                   #    828.333 M/sec
> > >   1058117350365  instructions             #      0.178 IPC
> > >      9161776218  cache-references         #      1.274 M/sec
> > >      1920494280  cache-misses             #      0.267 M/sec
> > 
> > Nice how the instruction count and the IPC value incraesed, and the 
> > cache-miss count decreased.
> > 
> > Btw., a 'perf stat' suggestion: you can also make use of built-in 
> > error bars via repeating parallel_pagefault N times:
> > 
> >   aldebaran:~> perf stat --repeat 3 /bin/ls
> 
> Ingo, with the repeat experiements I see
> 
> 7192354.545647  task-clock-msecs         #     23.955 CPUs    ( +- 0.002% )
>          425627  context-switches         #      0.000 M/sec  ( +- 0.333% )
>             155  CPU-migrations           #      0.000 M/sec  ( +- 10.897% )
>        95336481  page-faults              #      0.013 M/sec  ( +- 0.085% )
>   5951929070187  cycles                   #    827.536 M/sec  ( +- 0.009% )
>   1058312583796  instructions             #      0.178 IPC    ( +- 0.076% )
>      9616609083  cache-references         #      1.337 M/sec  ( +- 2.536% )
>      1952367514  cache-misses             #      0.271 M/sec  ( +- 0.156% )
> 
>   300.246532761  seconds time elapsed   ( +-   0.002% )
> 
> Except for the CPU migrations and the cache references, all the 
> other parameters seem to be well within an acceptable error range.

Yeah, nice!

	Ingo
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