Hi Ben, Just wanted to ping you on this. Do you think it will be possible to get a thing node with HT disabled for a day or two? Also, an unrelated question -- I saw there is an IBM XL compiler on dowd, but it does not have a valid license. Is there another compiler that works on that node? I need something a little more recent than the default gcc 4.4. I've tried unsuccessfully to build a more recent version of gcc. Thanks, Paul On Mon, Apr 27, 2015 at 4:00 PM, Paul Romano <[email protected]> wrote:
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. <[email protected]> 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 <[email protected]> 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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