Re: kernel-x64-smp-multiprocessor-time util problem

From: Bernd Petrovitsch
Date: Wed Jun 21 2006 - 04:40:10 EST


On Wed, 2006-06-21 at 03:17 -0500, art@xxxxxxxxxx wrote:
> Quoting Bernd Petrovitsch <bernd@xxxxxxxxx>:
> > On Mon, 2006-06-19 at 18:04 -0500, art@xxxxxxxxxx wrote:
> >> on dual core amd-athlon under 64bit-smp core
> >>
> >> kernel compilation time:
> >>
> >> time make -j 8
> >> ...
> >> LD [M] sound/usb/snd-usb-lib.ko
> >> LD [M] sound/usb/usx2y/snd-usb-usx2y.ko
> >>
> >> real 18m0.948s
> >> user 26m6.270s ------bad
> >> sys 4m22.256s ------?bad
> >> [xxx@localhost linux-2.6.17]$
> >> --- real-clock time is ~18 min -- user and system time doubled?
> >
> > How many virtual CPUs (i.e. HT is "2 CPUs") do you have in that machine?
[...]
> 1 CPU 2 cores = 2 (amd athlon x2 4200+)

What does "real" really measure?
What does "user" and "sys" really measure?

Bernd
--
Firmix Software GmbH http://www.firmix.at/
mobil: +43 664 4416156 fax: +43 1 7890849-55
Embedded Linux Development and Services

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