Increasing nb of cores per node degrade drastically the performance of cp2k.popt

[Maria Shadrina]

The CPU is Intel-Xeon-E5462 (Harpertown). Is that normal situation for
this type of xeon processors?

Best regards, Maria.


>
> this happens a lot with CPUs that have very limited memory bandwith.
> the quickstep algorithm is very demanding in terms of memory bandwidth.
>
>
>
> what type of xeon processors exactly? that makes all the difference.
> the 56xx (westmere) and 55xx (nehalem) series ones for example have
> _much_ more memory bandwidth than 54xx (harpertown) series ones.
>
> cheers,
>      axel.