Messages in this thread | | | Date | Tue, 07 Mar 2006 18:50:37 -0800 | From | Linda Walsh <> | Subject | FWIW: Re: SMP and 101% cpu max? |
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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. > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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