On Fri, Jan 27, 2012 at 09:24:10PM -0500, Joe Landman wrote: > > Are you talking about the latency of 1 core on 1 system talking to 1 > > core on one system, or the kind of latency that real MPI programs see, > > running on all of the cores on a system and talking to many other > > systems? I assure you that the latter is not 0.8 for any IB system. > > I am looking at these things from a "best of all possible cases" > scenario. So when someone comes at me with new "best of all possible > cases" numbers, I can compare. Sadly this seems to be the state of many > OEM/integrators/manufacturers.
The point I've been trying to make for the past 8 years is that one of the two chip families you're looking at doesn't degrade as much as the other from the "best of all possible cases" to a real cluster running a real code. > In storage, we see small disk form factor SSDs marketed generally, with > statments like 50k IOPs, and 500 MB/s. And if you knew that one family of SSDs had a wildly different ratio of peak alleged perf to real application performance, would you ignore that? I suspect not. -- greg _______________________________________________ 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
