<div dir="ltr"><div dir="ltr"><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Jan 24, 2022 at 1:38 PM Junchao Zhang <<a href="mailto:junchao.zhang@gmail.com">junchao.zhang@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Mark, I think you can benchmark individual vector operations, and once we get reasonable profiling results, we can move to solvers etc.</div></blockquote><div><br></div><div>Can you suggest a code to run or are you suggesting making a vector benchmark code?</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div><br><div><div><div dir="ltr"><div dir="ltr">--Junchao Zhang</div></div></div><br></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Jan 24, 2022 at 12:09 PM Mark Adams <<a href="mailto:mfadams@lbl.gov" target="_blank">mfadams@lbl.gov</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div dir="ltr"><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Jan 24, 2022 at 12:44 PM Barry Smith <<a href="mailto:bsmith@petsc.dev" target="_blank">bsmith@petsc.dev</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div><br></div> 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<div><br></div><div><div>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</div><div><br></div><div>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?</div></div></div></blockquote><div><br></div><div>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.</div><div><br></div><div>But Crusher is clearly not crushing it. </div><div><br></div><div>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.</div><div><br></div><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div><div><br></div><div><br></div><div><br><blockquote type="cite"><div>On Jan 24, 2022, at 12:14 PM, Mark Adams <<a href="mailto:mfadams@lbl.gov" target="_blank">mfadams@lbl.gov</a>> wrote:</div><br><div><div dir="ltr"><div dir="ltr"><br></div><div dir="ltr"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br>
Mark, can we compare with Spock?<br></blockquote><div><br></div><div> Looks much better. This puts two processes/GPU because there are only 4.</div></div></div>
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