<div dir="ltr"><div><div><div><div>Attached is the -log_view output (from firedrake). Event Stage 1: Linear_solver is where I assemble and solve the linear system of equations.<br><br></div>I am using the HYPRE BoomerAMG preconditioner so log_view cannot "see into" the exact steps, but based on what it can see, how do I distinguish between these various setup and timing phases?<br><br></div>For example, when I look at these lines:<br><br>PCSetUp 1 1.0 2.2858e+00 1.0 0.00e+00 0.0 0.0e+00 0.0e+00 0.0e+00 9 0 0 0 0 11 0 0 0 0 0<br>PCApply 38 1.0 1.4102e+01 1.0 0.00e+00 0.0 0.0e+00 0.0e+00 0.0e+00 56 0 0 0 0 66 0 0 0 0 0<br>KSPSetUp 1 1.0 9.9111e-04 1.0 0.00e+00 0.0 0.0e+00 0.0e+00 0.0e+00 0 0 0 0 0 0 0 0 0 0 0<br>KSPSolve 1 1.0 1.7529e+01 1.0 2.44e+09 1.0 0.0e+00 0.0e+00 0.0e+00 70 7 0 0 0 82 7 0 0 0 139<br>SNESSolve 1 1.0 2.1056e+01 1.0 3.75e+10 1.0 0.0e+00 0.0e+00 0.0e+00 84100 0 0 0 99100 0 0 0 1781<br>SNESFunctionEval 1 1.0 1.0763e+00 1.0 1.07e+10 1.0 0.0e+00 0.0e+00 0.0e+00 4 29 0 0 0 5 29 0 0 0 9954<br>SNESJacobianEval 1 1.0 2.4495e+00 1.0 2.43e+10 1.0 0.0e+00 0.0e+00 0.0e+00 10 65 0 0 0 12 65 0 0 0 9937<br><br></div>So how do I break down "mesh setup", "matrix setup", and "solve time" phases? I am guessing "PCSetUp" has to do with one of the first two phases, but how would I categorize the rest of the events? I see that HYPRE doesn't have as much information as the other PCs like GAMG and ML but can one still breakdown the timing phases through log_view alone?<br><br></div><div>Thanks,<br></div><div>Justin<br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Aug 30, 2016 at 11:14 PM, Jed Brown <span dir="ltr"><<a href="mailto:jed@jedbrown.org" target="_blank">jed@jedbrown.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">Mark Adams <<a href="mailto:mfadams@lbl.gov">mfadams@lbl.gov</a>> writes:<br>
<br>
>><br>
>><br>
>> Anyway, what I really wanted to say is, it's good to know that these<br>
>> "dynamic range/performance spectrum/static scaling" plots are designed to<br>
>> go past the sweet spots. I also agree that it would be interesting to see a<br>
>> time vs dofs*iterations/time plot. Would it then also be useful to look at<br>
>> the step to setting up the preconditioner?<br>
>><br>
>><br>
> Yes, I generally split up timing between "mesh setup" (symbolic<br>
> factorization of LU), "matrix setup" (eg, factorizations), and solve time.<br>
> The degree of amortization that you get for the two setup phases depends on<br>
> your problem and so it is useful to separate them.<br>
<br>
</span>Right, there is nothing wrong with splitting up the phases, but if you<br>
never show a spectrum for the total, then I will be suspicious. And if<br>
you only show "per iteration" instead of for a complete solve, then I<br>
will assume that you're only doing that because convergence is unusably<br>
slow.<br>
</blockquote></div><br></div>