multi core session
 

Hi everybody,

i am working with CCM+ on a intel quad core linux workstation, and have one star ccm+ licence and also licence for using two cores for solving. But i am a little bit confused, because when i solve a simulation, i can see on my system monitor that only two of the eight virtuell CPU's are running.
For the people who are wondering now, why there are 8 CPU's on a quad core, this is because every physical CPU is diveded into 2 virtuell CPU's.
So that means, although i have a two core licence star cmm+ is solving on two virtuell CPU's that means just one physical CPU.

I have already talked to the support,but they can't really help me.

I would like to know if anybody else have made these experience and maybe somebody know why it is like this.

Best regards,
Max

The OS should schedule the two threads onto two different physical cores. Some OSes can get confused as to what is/is not a real CPU (some Linux versions). In this case if you turn off the hyperthreading in the BIOS then all cores are real and the problem goes away.

I doubt that most CAE/HPC applications are heavily threaded enough to really gain from hyperthreading and thus it is no real loss.

Thanks Robert for helping me. After i have disabled hyperthreading it works fine :).


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