Bug#547207: Is still reproduceable? [ogg123: widely different CPU usage between invocations]
maxy at debian.org
Sun Jan 29 18:49:46 UTC 2012
Hola Florian Weimer!
El 29/01/2012 a las 18:39 escribiste:
> > Please tell us if you can reproduce it in a squeeze, wheezy, or sid
> > installation.
> On squeeze, I still see this:
> Cpu0 : 19.6%us, 27.2%sy, 0.0%ni, 53.2%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Which tool are you using to gather this data for a particular process?
> This is on a Core i7 X980. Decoding Ogg Vorbis shouldn't need 50% of
> one core on this CPU.
Ok, I'm testing this in a quad core with squeeze and it uses ~10% cpu (kernel
2.6.32-5-amd64), which is 40% of one of the processors.
In a similar machine (core 2 duo with squeeze) with kernel
3.2.0-0.bpo.1-686-pae it uses ~12% cpu, which is 24% of one of the processors.
My machine is an i5 running sid in amd64 and it uses ~1.5% cpu which is 6% of
one of the processors.
Just for fun, I also tested ogg123 in a atom single core machine running
squeeze, kernel 2.6.32-5-686, eating 2% of the cpu. :)
The vorbis-tools package is the same in the four machines, so I think the
problem is not in the vorbis-tools package. Seeing this results I think the
problem might be a issue with threads migrating between cpus, which shouldn't
It would be great if you could test it with the kernel 3.2.0 from
"If you optimize everything, you will always be unhappy."
-- Donald Knuth
Saludos /\/\ /\ >< `/
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