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

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Message-ID: <87d472gyw9.fsf@basil.nowhere.org>
Date:	Tue, 11 Aug 2009 17:20:54 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Prarit Bhargava <prarit@...hat.com>
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)

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
>
> 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.

Is the compilation stable over multiple runs?

Still it looks like the patch is clearly needed.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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