[K12OSN] TuxMath test on 8 core machine with teamed NICs 16GB RAM
Jim Kronebusch
jim at winonacotter.org
Thu Dec 6 16:18:28 UTC 2007
On Thu, 06 Dec 2007 11:07:22 -0500, James P. Kinney III wrote
> On Thu, 2007-12-06 at 10:30 -0500, Jim Kronebusch wrote:
> > On Thu, 06 Dec 2007 08:43:46 -0600, Tim Born wrote
> > > I'll bet your 8 cores were only using one. Sounds like the code doesn't
> > > know how to handle multiple cores.
> > > -tim
> >
> > I was wondering the same thing, but I don't know how to check which core a process is
> > running under.
>
> Under load run top and hit the #1 button to see all the cores loading
> profiles. Now hit "j" and look at the "P" column. This will show the
> last cpu number a process was running on.
>
> Of course the system will be slowly grinding to a halt so maybe only try
> this with the first 10 users.
Under top it tells me that "j" is an unknown command. However, for what its worth, I
was monitoring constantly with htop the CPU/RAM usage on a separate machine over ssh
while running the TuxMath tests. Htop shows all processors by default, and as the
instances of TuxMath increased, processor usage climbed on all 8 cores. When the system
was max'ed out all 8 cores shows 100% usage. So I assume that TuxMath was at least
starting different instances on each core, but I did not know how to look at the
individual TuxMath processes and determine which core they were running on. I also
don't know if TuxMath is capable of distributing the load of a single process over
multiple cores. Does that make sense?
Jim
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