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

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Message-ID: <20090814020122.GL5087@balbir.in.ibm.com>
Date:	Fri, 14 Aug 2009 07:31:23 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Ingo Molnar <mingo@...e.hu>
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)

* 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.


-- 
	Balbir
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