[gmx-developers] gromacs @ AMD Interlagos

[David van der Spoel]

On 2012-05-01 09:19, David van der Spoel wrote:
> Hi,
>
> we have done some very preliminary benchmarks on AMD Interlagos nodes, 4
> CPUs with 12 cores each. After hearing a report that in fact on these
> machines 2 cores share an FPU and a SSE unit, a colleague tested a
> simple protein in water:
>
> ... after a short 1 ns test run, the 24 (2x12) core solution
> outperformed the 48 core one (16.3 ns/day vs. 1.4 ns/day). Restraint on
> protein heavy atoms, NVT, waters mobile, ca. 38000 atoms.
>
> Can anyone confirm this result? It seems excessive to me.
>
What this would imply, if confirmed, is that we would need to allocate 
only half the number of threads on this architecture, compared to the 
number of cores.

-- 
David van der Spoel, Ph.D., Professor of Biology
Dept. of Cell & Molec. Biol., Uppsala University.
Box 596, 75124 Uppsala, Sweden. Phone:	+46184714205.
spoel at xray.bmc.uu.se    http://folding.bmc.uu.se