Re: Hyperthreading and physical/logical CPU identification

[Andrew Theurer]

> > I would very much like to believe that in this configuration,
> > I am only
> > running on 2 physical, 4 logical processors, but I am getting a 31%
> > improvement (netbench) when hyperthreading is enabled.  Thats
> > why I want to
> > confirm I am really only using 2 physical, 4 logical
> > processors.  Is there
> > any way I can do this? (dmesg? /proc/cpuinfo?)
>
> Well the two alternatives are, either A) turning on hyperthreading enabled
> the two virtual processors or B) turning on hyperthreading somehow enabled
> the other two processors, right?
>
> I would think B would be highly unlikely.
>
> Anyone else who actually has HT hardware care to comment? ;-)
>
> Regards -- Andy

Yes, those are the two alternatives.  I agree B is unlikely, but honestly I 
thought a 31% improvement from hyperthreading seemed unlikely as well.  
Believe me, I am hoping situaiton A is the correct one!

-Andrew