On Mon, Jan 24, 2022 at 2:11 PM Junchao Zhang <junchao.zh...@gmail.com> wrote:
> > > On Mon, Jan 24, 2022 at 12:55 PM Mark Adams <mfad...@lbl.gov> wrote: > >> >> >> On Mon, Jan 24, 2022 at 1:38 PM Junchao Zhang <junchao.zh...@gmail.com> >> wrote: >> >>> Mark, I think you can benchmark individual vector operations, and once >>> we get reasonable profiling results, we can move to solvers etc. >>> >> >> Can you suggest a code to run or are you suggesting making a vector >> benchmark code? >> > Make a vector benchmark code, testing vector operations that would be used > in your solver. > Also, we can run MatMult() to see if the profiling result is reasonable. > Only once we get some solid results on basic operations, it is useful to > run big codes. > So we have to make another throw-away code? Why not just look at the vector ops in Mark's actual code? Matt > >> >>> >>> --Junchao Zhang >>> >>> >>> On Mon, Jan 24, 2022 at 12:09 PM Mark Adams <mfad...@lbl.gov> wrote: >>> >>>> >>>> >>>> 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> >>>>> >>>>> >>>>> -- What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead. -- Norbert Wiener https://www.cse.buffalo.edu/~knepley/ <http://www.cse.buffalo.edu/~knepley/>