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Re: [K12OSN] TuxMath test on 8 core machine with teamed NICs 16GB RAM



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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