From: Alistair John Strachan <s0348365@sms.ed.ac.uk>
To: Erik Slagter <erik@slagter.name>
Cc: Keith Owens <kaos@ocs.com.au>, linux-kernel@vger.kernel.org
Subject: Re: md mirror / ext3 / dual core performance strange phenomenon?
Date: Mon, 14 Aug 2006 15:48:50 +0100 [thread overview]
Message-ID: <200608141548.51047.s0348365@sms.ed.ac.uk> (raw)
In-Reply-To: <1155561963.7809.30.camel@skylla.slagter.name>
On Monday 14 August 2006 14:26, Erik Slagter wrote:
> On ma, 2006-08-14 at 23:22 +1000, Keith Owens wrote:
> > >BUT... starting from -j4 (and upwards) the compile time suddenly goes to
> > >3.5 minutes!
> >
> > Nothing to do with the disks, it is a design flaw in the kernel build
> > system. If you want a useful parallel make using -j<n>, set <n> to 3,
> > 4 or 5 higher than the real number of parallel jobs that you want. The
> > exact value to add depends on which kernel tree you are building. See
> > http://marc.theaimsgroup.com/?l=linux-kernel&m=115553906404695&w=2
>
> Okay, so it basically means I shouldn't worry here.
>
> Sorry for bothering, I couldn't come up with a proper search term...
I find that for mainline, using an odd number of jobs works better. I can get
my X2 3800+ to full saturation with -j5.
--
Cheers,
Alistair.
Final year Computer Science undergraduate.
1F2 55 South Clerk Street, Edinburgh, UK.
next prev parent reply other threads:[~2006-08-14 14:49 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-14 13:12 Erik Slagter
2006-08-14 13:22 ` Keith Owens
2006-08-14 13:26 ` Erik Slagter
2006-08-14 14:48 ` Alistair John Strachan [this message]
2006-08-14 14:01 ` Alan Cox
2006-08-14 13:49 ` Erik Slagter
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