> On Jan 8, 2015, at 7:59 PM, Mark Adams <[email protected]> wrote: > > > > On Thu, Jan 8, 2015 at 7:04 PM, Barry Smith <[email protected]> wrote: > > > On Jan 8, 2015, at 2:47 PM, Mark Adams <[email protected]> wrote: > > > > I have a project that needs to show a plan for moving the the new ORNL > > machine SUMMIT > > Isn't Summit IBM PowerN + Nvidia GPUs with a huge percentage of the > available floating point performance only available from the GPUs? Thus > utilizing the machine means much more utilizing GPUs than utilizing "threads" > on the PowerN? > > No, they have very small grids but lots of parallelism because most of the > data is in particles. like 10K particles per cell. So we just need to run > on the CPU.
Huhh? I don't think one can just run on the CPU's of this machine. You are throwing away 90+ percent of the machine! Did someone in authority tell you it is fine to just use the CPUs in this machine? Hell, I need to talk to them :-) Barry > > > > > and I wanted to see if there is any writeup or data with respect to thread > > performance in PETSc. > > We've never run the thread code of PETSc on PowerN (I suspect it would be > fairly good but PowerN systems are too expensive to buy to test with :-)). > > Well this is your lucky day! I should be able to get access to the P9 of > SUMMIT :)
