[osg-users] CPU Performance issues with AMD 2700 vs Intel Corei7 4770S

[François Cami]

Hi,

On Tue, Apr 2, 2019 at 8:52 AM Robert Osfield <robert.osfield at gmail.com> wrote:
>
> Hi Chris,
>
> On Mon, 1 Apr 2019 at 21:41, Chris Hanson <xenon at alphapixel.com> wrote:
> > I don't have any modern Apples to Apples comparisons to cite.
> >
> > I do know, that if you recall, we ran into threading issues when dealing with the massive plenoptic display IG back in 2015 or so on AMD cards, and it needed special assistance from AMD to unclog it.
>
> In this case I have a AMD CPU with a NVidia graphics card so a bit of
> different set of things that could cause issues.
>
> One test I did yesterday afternoon was to try clang-7 on my new AMD
> system but didn't see any performance notable difference.

Could it be the inter-CCX latency specific to Ryzen?
https://community.amd.com/thread/215519

In this case you might want to use taskset. The following should limit
the command to the first CCX if HT is enabled:
taskset -c 0-7 <osgApp>

Cheers
François

> > Do you know Graham Sellers at AMD? Maybe we could get some advising from him.
>
> I don't know Graham, is he on the graphics or CPU side?
>
> Cheers,
> Robert.
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