linux-kernel - Re: Ten percent test

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Message-id: <200704090116.37329.gene.heskett@gmail.com>
Date:	Mon, 09 Apr 2007 01:16:33 -0400
From:	Gene Heskett <gene.heskett@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Mike Galbraith <efault@....de>, Ingo Molnar <mingo@...e.hu>,
	Con Kolivas <kernel@...ivas.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	ck list <ck@....kolivas.org>
Subject: Re: Ten percent test

On Monday 09 April 2007, Mike Galbraith wrote:
>On Sun, 2007-04-08 at 13:56 -0400, Gene Heskett wrote:
>> On Sunday 08 April 2007, Mike Galbraith wrote:
>> >On Sun, 2007-04-08 at 07:33 -0400, Gene Heskett wrote:
>> >> That seems to be the killer loading here, building a kernel (make
>> >> -j3) doesn't seem to lag it all that bad.  One session of gzip
>> >> -best makes it fall plumb over though, which was a disappointment.
>> >
>> >Can you make a testcase that doesn't require amanda?
>> >
>> >	-Mike
>>
>> Sure.  Try 'tar czf nameofarchive.tar.gz /path/to-dir-to-be-backed-up'
>>
>> Or, from the runtar log from this morning, and this is all one line:
>>
>> runtar.20070408022016.debug:running: /bin/tar: 'gtar' '--create'
>> '--file' '-' '--directory' '/usr/dlds-rpms' '--one-file-system'
>> '--listed-incremental'
>> '/usr/local/var/amanda/gnutar-lists/coyote_usr_dlds-rpms_1.new'
>> '--sparse' '--ignore-failed-read' '--totals' '--exclude-from'
>> '/tmp/amanda/sendbackup._usr_dlds-rpms.20070408022016.exclude' '.'
>>
>> and amanda will if requested, pipe that output through a |gzip -best,
>> and its this process that brings the machine to the table begging for
>> scraps like a puppy.  Tar by itself can be felt but isn't bad.
>
>So tar -cvf - / | gzip --best | tar -tvzf - should reproduce the
>problem?
>
>	-Mike

That looks as if it should demo it pretty well if I understand correctly 
everything you're doing there.

-- 
Cheers, Gene
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
In /users3 did Kubla Kahn
A stately pleasure dome decree,
Where /bin, the sacred river ran
Through Test Suites measureless to Man
Down to a sunless C.
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