From: Linda Walsh <lkml@tlinx.org>
To: Jesper Juhl <jesper.juhl@gmail.com>
Cc: Magnus Damm <magnus.damm@gmail.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: FWIW: Re: SMP and 101% cpu max?
Date: Tue, 07 Mar 2006 18:50:37 -0800 [thread overview]
Message-ID: <440E467D.70804@tlinx.org> (raw)
In-Reply-To: <9a8748490603070507h48e2fe02qbf9da7956e794161@mail.gmail.com>
FYI, running/compiling 2.6.15.5 on a 2x(1GHzxP-III), 1GB
times for "make" -jn bzImage (no modules):
(using export TIMEFORMAT="%2Rsec %2Uusr %2Ssys (%P%% cpu)" )
-j1: 815.80sec 745.64usr 78.74sys (100.00% cpu)
-j2: 445.17sec 778.68usr 86.22sys (100.00% cpu)
-j3: 444.89sec 781.66usr 87.84sys (100.00% cpu)
-j4: 443.08sec 781.81usr 87.97sys (100.00% cpu)
-j5: 445.98sec 782.53usr 87.51sys (100.00% cpu)
-----
I am not seeing the symptom you are describing. The load
increases proportionately to the 'job limit', but it doesn't
radically change the overall cpu required. As I have
only 2 cpu's, I can't expect much benefit beyond 2x, with
actual approaching closer to 1.8x.
-l
Jesper Juhl wrote:
> On 3/7/06, Magnus Damm <magnus.damm@gmail.com> wrote:
>
>> With 128MB and 256MB configurations, a majority of the tests never
>> make it over 101% CPU usage when I run "make -j 2 bzImage", building a
>> allnoconfig kernel. With 64MB memory, everything seems to be working
>> as expected. Also, running "make bzImage" works as expected too.
>>
> Hmm, I wonder if it's related to the problem I reported here :
> http://lkml.org/lkml/2006/2/28/219
> Where I need to run make -j 5 or higher to load both cores of my Athlon X2.
>
next prev parent reply other threads:[~2006-03-08 2:50 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-07 12:34 SMP and 101% cpu max? Magnus Damm
2006-03-07 13:07 ` Jesper Juhl
2006-03-07 13:20 ` [PATCH] IRQ: prevent enabling of previously disabled interrupt Bryan Holty
2006-03-07 23:58 ` Andrew Morton
2006-03-08 1:53 ` SMP and 101% cpu max? Magnus Damm
2006-03-08 2:50 ` Linda Walsh [this message]
2006-03-08 3:04 ` FWIW: " Magnus Damm
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