On Mon, Mar 26, 2007 at 09:38:43AM -0700, Gilad Shainer wrote: > This is yet another example of "fair" comparison. Unlike Qlogic, > Mellanox offer a family of products for PCIe servers, and there are > multiple MPI versions that support those products. The performance > depends on the hardware you pick and the software you use.
There are 4 MPIs that support InfiniPath's InfiniBand extension. The servers basically were identical in this comparison: 3 Ghz dual/dual Woodcrests. If you'd like to suggest a better MPI to HP, please do so. > Why don't you look at > http://www.clustermonkey.net//content/view/178/33/? You didn't say where you got the InfiniPath Fluent numbers. If it's my whitepaper, I was not running version 6.3 of Fluent. Also, my number was not run with HP-MPI. But in another month, I'll have a new whitepaper with a Fluent chart, run with 6.3 and HP-MPI. > This shows that Mellanox SDR beats Qlogic, even on a latency sensitive > applications, and that was before ConnectX. Fluent isn't latency sensitive at the L problem size. Real customer runs with Fluent are much larger than the L problem size. (I just spent a few days visiting with a Formula 1 racing team, so this is fresh in my mind.) > As for the overhead portion, this paper does not compare hardware to > hardware overhead, and it is greatly influenced by the MPI software > implementation. If you'd like to suggest to Doug how your number could be improved, please do so. You've had since September 2005. > But who cares what exactly did they measured, right?..... Anyway, it > is very reasonable to believe that On-loading architecture has lower > CPU overhead than Off-loading one... You're correct, "everybody knows" that onload must have higher overhead. Why bother testing it? "Everybody knows" that the cpu with the highest Ghz is fastest. -- greg _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
