Performance in Task Manager only 40%

[HomaPumpen]

Hello,

we have installed CFD on a Dell workstation with 16 cores and 64GB RAM. I am looking at the Task Manager during simluation and I can see that CFD is using all 16 cores but the overall performance is about 40% only. even the fan speed of the workstation is not going up.

What can I do to make the machine use all of the capacities?

Thanks,

Martin

[HomaPumpen]

One additional infromation: It is a 8 core CPU and it is showing 16 cores due to hyper threading.

[scott.werner]

Martin,

For each SimCFDSolver.exe process, we set the Priority to Low. We do this so your system is usable during solving. You can increase the priority on each SimCFDSolver.exe process by: Task Manager > Right Click on Process Name > Set Priority. Warning: You can crank up the priority of a non-system process so high that it can cause the system to become unstable and non-responsive because the system processes don't get enough time (http://stackoverflow.com/questions/8658469/does-changing-the-process-priority-in-windows-task-manage...

[HomaPumpen]

Thanks for the quik response.

One more question: Do I hve to switch of the hyper threading?  Is there a diference in stability and calculation speed with and without hyper threading?

Martin

[apolo_vanderberg]

Martin,

The main reason you see that value in the Task Manager is that we are only running 1 solver / physical core.

8cores means 8solvers. Each solver will use ~100% of the core its assigned to. So as far as windows will report due to hyperthreading taht <100% is utilized as it shows all 16cores, and only 8 of which are being taxed fully. So for your machine if we were running at full speed we would read 50% utilization via taskmanager.

There are some instances where disabling HT can improve performance of the solver. With HT turned off you would then see this percentage go up to 80/90%

Apolo