Hi Ben,

One aspect of the study I'm performing is to look at any potential differences between the situation you just described, i.e. only using as many threads as there are physical cores with HT enabled, and actually disabling HT altogether, so unfortunately binding to the first hardware thread won't suffice. Once I have everything scripted and ready to go, it shouldn't take more than a day or two to perform the actual runs.

Best,

Paul

On Sun, Apr 26, 2015 at 9:54 PM, Allen, Benjamin S. <bsallen@alcf.anl.gov> wrote:

Hi Paul,

Will running your application with taskset or numactl suffice, eg: taskset -c 0-35 cmd or numactl -C 0-35 cmd? Thus pinning the application to the first hardware thread on each core.

If not how long do you think you'll need a machine with HT disabled?

Ben

> On Apr 25, 2015, at 7:31 AM, Paul Romano <promano@anl.gov> wrote:
>
> Hi,
>
> I'm currently doing some studies on the impact of hardware threading on code performance for nuclear reactor neutronic calculations. I was wondering if it might be possible to have one of the thing nodes configured with hardware threading disabled for the sake of running comparisons.
>
> Thanks,
> Paul
>

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