linux-kernel - Re: Ten percent test

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Message-Id: <1176092271.6355.16.camel@Homer.simpson.net>
Date:	Mon, 09 Apr 2007 06:17:51 +0200
From:	Mike Galbraith <efault@....de>
To:	Gene Heskett <gene.heskett@...il.com>
Cc:	linux-kernel@...r.kernel.org, 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 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

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