From: "Hemmann, Volker Armin" <volker.armin.hemmann@tu-clausthal.de>
To: gentoo-amd64@lists.gentoo.org
Subject: Re: [gentoo-amd64] Re: Unexpected side effect of GCC 4
Date: Mon, 6 Nov 2006 13:05:31 +0100 [thread overview]
Message-ID: <200611061305.31763.volker.armin.hemmann@tu-clausthal.de> (raw)
In-Reply-To: <200611061148.52817.prh@gotadsl.co.uk>
On Monday 06 November 2006 12:48, Peter Humphrey wrote:
> On Monday 06 November 2006 10:47, Hemmann, Volker Armin wrote:
> > Set Portage_NICENESS to 19, MAKEOPTS ot -jX with X maximum number of
> > cores and activate ccache with at least 4GB and you don't need tempfs to
> > install KDE (all of it), in less than 10h.
>
> Are you implying that setting X > number of cores will slow it down? I
> have -j5 with two single CPUs, and KDE (part of it) takes far longer than
> that.
lets ask the other way round. Why should it speed up anything to have X>number
of cores? Instead of a single thread per core, compiling happily, you have
two or more competing for one core and regularly kick out each others data
from the cache.
--
gentoo-amd64@gentoo.org mailing list
next prev parent reply other threads:[~2006-11-06 12:09 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-05 8:45 [gentoo-amd64] Unexpected side effect of GCC 4 Peter Humphrey
2006-11-05 10:12 ` [gentoo-amd64] " Duncan
2006-11-05 11:50 ` Peter Humphrey
2006-11-05 12:10 ` Peter Humphrey
2006-11-06 8:17 ` Duncan
2006-11-06 8:29 ` Hemmann, Volker Armin
2006-11-06 15:57 ` Duncan
2006-11-06 7:50 ` Duncan
2006-11-06 8:48 ` Peter Humphrey
2006-11-06 16:01 ` Duncan
2006-11-06 16:06 ` Peter Humphrey
2006-11-06 8:41 ` Duncan
2006-11-06 10:47 ` Hemmann, Volker Armin
2006-11-06 11:48 ` Peter Humphrey
2006-11-06 12:05 ` Hemmann, Volker Armin [this message]
2006-11-06 12:49 ` Jack Lloyd
2006-11-06 12:59 ` Hemmann, Volker Armin
2006-11-06 13:06 ` Jack Lloyd
2006-11-06 15:06 ` Peter Humphrey
2006-11-06 11:44 ` Peter Humphrey
2006-11-06 15:51 ` Duncan
2006-11-08 11:19 ` Peter Humphrey
2006-11-08 15:17 ` Duncan
2006-11-10 10:14 ` Peter Humphrey
2006-11-05 13:24 ` Hemmann, Volker Armin
2006-11-05 23:26 ` Duncan
2006-11-08 10:14 ` [gentoo-amd64] " Peter Humphrey
2006-11-08 11:06 ` [gentoo-amd64] " Duncan
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