Re: [BProc] dual processor slowness

[Steven J. <py...@li...>]

Greetings,

It is probably worth cat /proc/cpuinfo. I found that some dual xeons with
some kernel versions don't actually disable hyperthreading even if
that is set in BIOS unless ACPI is enabled.

Otherwise, I'm out of ideas.

G'day,
sjames


-------------------------steven james, director of research, linux labs
... ........ ..... ....                    230 peachtree st nw ste 2701
the original linux labs                             atlanta.ga.us 30303
      -since 1995                              http://www.linuxlabs.com
                                              office & fax 866.545.6306
-----------------------------------------------------------------------


On Tue, 20 Jul 2004, Luke Palmer wrote:

> Nope, I've got it off in the BIOS for everything except the master.
> I've heard the linux scheduler can't tell the fake CPUs from the real
> ones, and can get two processes stuck on the same physical CPU.  That
> would have explained it though...
>
> Any other ideas?
> -Luke
>
> On Tue, 2004-07-20 at 14:09, Steven James wrote:
> > Greetings,
> >
> > Any chance hyperthreading is turned on?
> >
> > G'day,
> > sjames
> >
> >
> > -------------------------steven james, director of research, linux labs
> > ... ........ ..... ....                    230 peachtree st nw ste 2701
> > the original linux labs                             atlanta.ga.us 30303
> >       -since 1995                              http://www.linuxlabs.com
> >                                               office & fax 866.545.6306
> > -----------------------------------------------------------------------
> >
> >
> > On Tue, 20 Jul 2004, Luke Palmer wrote:
> >
> > > Hi everyone,
> > >
> > > My cluster is made up of dual Xeon nodes with 2GB memory.  We formerly
> > > ran openMosix, which actually worked quite well other than the one hour
> > > uptimes...  Anyway, we observe that when placing two processes on a
> > > node, they run about half as fast as they would were a single process
> > > placed on a node.  If I look at ps or top, both processes stay at 99.9%
> > > or so, and the load averages stay just shy of 2, but the wall clock
> > > doesn't lie...
> > >
> > > I'm running the most recent clustermatic stuff, so nodes and master have
> > > 2.4.22-cm36smp kernels over Fedora Core 1.  This didn't used to happen
> > > with openMosix for the exact same executables.  Any ideas of things to
> > > look at?
> > >
> > > Thanks
> > > -Luke
> > >
> > >
> > >
> > >
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