On Tue, Aug 11, 2009 at 12:19 PM, Mikhail Kuzminsky<[email protected]> wrote: > If this results are for HyperThreading "ON", it may be not too strange > because of "virtual cores" competition. > > But if this results are for switched off Hyperthreading - it's strange. > I have usual good DFT scaling w/number of cores on G03 - about in 7 times > for 8 cores.
Yes, it is very strange and I still cannot explain it very well. Do you have scaling info for VASP? You did mention DFT codes so I was wondering. I still haven't found much info for VASP on Nehlems. Maybe it is some feature of this particular code. All the other tests make sense. And I just find it hard to believe that the Nehalem which has been so far touted to be such a good proc. can be outperformed by by one year old AMD Barcelonas.......I feel it's something I am doing wrong. -- Rahul _______________________________________________ Beowulf mailing list, [email protected] sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
