> On 20/04/16 16:52, John Hearns wrote: > >> I would be grateful for pointers towards HPL performance figures for >> Broadwell (v4) processors. >> >> I ask as I am getting some very good values and I want to do a sanity >> check! > > Dell has some HPL and STREAM benchmark numbers here (found with a quick > google): > > http://en.community.dell.com/techcenter/high-performance-computing/b/general_hpc/archive/2016/03/31/measuring-performance-of-intel-broadwell-processors-with-high-performance-computing-benchmarks
Expect the author is a bit confused about calculating % of peak and in one case (E2650) seems be reporting a result of 878 GFLOPS vs a theoretical peak of 844. He states in Figure 1 that the E2650 result is 127% efficient which I assume is based on his bogus 356 GFLOP theoretical maximum, thus the actual number he reports in Figure 1 is 878 GFLOPS, (1.27x346x2 processors) Basically I don't trust these numbers. I assume the rest of the data are equally wrong. Being an old school kind of dude a link to the raw output is always nice and some run-time data like HT (on off) and number of threads etc. is helpful. > > Others from Boston in the UK: > > https://www.boston.co.uk/blog/2016/04/06/intel-xeon-e5-2600-v4-codename-broadwell-launch-and-preliminary-bench.aspx They report 859 GFLOPS for the E5-2650, again above peak, but they seem to state that HT is on. How many threads do they use for the test? I assumed that enabling HT hurt HPL numbers (at least in my MPI tests it does). Is it possible that for these tests, HT helps performance (a bit), but in the case of the Dell blog, including the HT "cores" means doubling the peak number which would make the result look bad? Sigh. -- Doug > > All the best, > Chris > -- > Christopher Samuel Senior Systems Administrator > VLSCI - Victorian Life Sciences Computation Initiative > Email: sam...@unimelb.edu.au Phone: +61 (0)3 903 55545 > http://www.vlsci.org.au/ http://twitter.com/vlsci > > _______________________________________________ > Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing > To change your subscription (digest mode or unsubscribe) visit > http://www.beowulf.org/mailman/listinfo/beowulf > > -- > Mailscanner: Clean > -- Doug -- Mailscanner: Clean _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
