On Mon, Jan 24, 2022 at 12:44 PM Barry Smith <bsm...@petsc.dev> wrote:
> > Here except for VecNorm the GPU is used effectively in that most of the > time is time is spent doing real work on the GPU > > VecNorm 402 1.0 4.4100e-01 6.1 1.69e+09 1.0 0.0e+00 0.0e+00 > 4.0e+02 0 1 0 0 20 9 1 0 0 33 30230 225393 0 0.00e+00 0 > 0.00e+00 100 > > Even the dots are very effective, only the VecNorm flop rate over the full > time is much much lower than the vecdot. Which is somehow due to the use of > the GPU or CPU MPI in the allreduce? > The VecNorm GPU rate is relatively high on Crusher and the CPU rate is about the same as the other vec ops. I don't know what to make of that. But Crusher is clearly not crushing it. Junchao: Perhaps we should ask Kokkos if they have any experience with Crusher that they can share. They could very well find some low level magic. > > > On Jan 24, 2022, at 12:14 PM, Mark Adams <mfad...@lbl.gov> wrote: > > > >> Mark, can we compare with Spock? >> > > Looks much better. This puts two processes/GPU because there are only 4. > <jac_out_001_kokkos_Spock_6_1_notpl.txt> > > >