[petsc-users] Understanding log summary
Barry Smith
bsmith at mcs.anl.gov
Fri May 19 13:02:05 CDT 2017
> On May 19, 2017, at 9:25 AM, Zou, Ling <ling.zou at inl.gov> wrote:
>
> Hi All,
>
> In terms of code performance, sometimes people would ask for info about total non-linear iteration numbers, total linear iteration numbers, etc. I suppose all these could be found in the log summary. For the attached log summary, can I say?
> total non-linear iteration number = 573
> total linear iteration number = 2321
Yes,
The log file is kind of funny. It spends 62% of the time in MatFDColorApply() which is computing the Jacobian via differencing and coloring, this is a lot of time. You might consider lagging the Jacobian; that is not recompute the Jacobian for each new linear solve. You can use -snes_lag_jacobian 2 or -snes_lag_jacobian 3 etc and see how this affects the run time.
Barry
> MatMult MF
>
> Thank you.
>
> Ling
>
>
>
> ------------------------------------------------------------------------------------------------------------------------
> Event Count Time (sec) Flops --- Global --- --- Stage --- Total
> Max Ratio Max Ratio Max Ratio Mess Avg len Reduct %T %F %M %L %R %T %F %M %L %R Mflop/s
> ------------------------------------------------------------------------------------------------------------------------
>
> --- Event Stage 0: Main Stage
>
> VecDot 607 1.0 1.8729e-04 1.0 1.95e+05 1.0 0.0e+00 0.0e+00 0.0e+00 0 0 0 0 0 0 0 0 0 0 1040
> VecMDot 2321 1.0 1.1075e-03 1.0 2.87e+06 1.0 0.0e+00 0.0e+00 0.0e+00 0 5 0 0 0 0 5 0 0 0 2590
> VecNorm 5422 1.0 1.2229e-03 1.0 1.74e+06 1.0 0.0e+00 0.0e+00 0.0e+00 0 3 0 0 0 0 3 0 0 0 1423
> VecScale 5822 1.0 1.2764e-03 1.0 9.37e+05 1.0 0.0e+00 0.0e+00 0.0e+00 0 2 0 0 0 0 2 0 0 0 734
> VecCopy 14334 1.0 1.8302e-03 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
> VecSet 1231 1.0 3.0700e-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
> VecAXPY 14961 1.0 3.3679e-03 1.0 4.82e+06 1.0 0.0e+00 0.0e+00 0.0e+00 0 9 0 0 0 0 9 0 0 0 1430
> VecWAXPY 20842 1.0 5.5537e-03 1.0 4.00e+06 1.0 0.0e+00 0.0e+00 0.0e+00 0 8 0 0 0 0 8 0 0 0 721
> VecMAXPY 2894 1.0 1.4292e-03 1.0 3.62e+06 1.0 0.0e+00 0.0e+00 0.0e+00 0 7 0 0 0 0 7 0 0 0 2536
> VecSetRandom 34 1.0 1.0322e-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
> VecReduceArith 1146 1.0 2.9907e-04 1.0 3.68e+05 1.0 0.0e+00 0.0e+00 0.0e+00 0 1 0 0 0 0 1 0 0 0 1230
> VecReduceComm 573 1.0 9.2384e-05 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
> VecNormalize 2894 1.0 1.9604e-03 1.0 1.39e+06 1.0 0.0e+00 0.0e+00 0.0e+00 0 3 0 0 0 0 3 0 0 0 712
> SNESJacobianEval 573 1.0 2.2410e+00 1.0 5.60e+06 1.0 0.0e+00 0.0e+00 0.0e+00 62 11 0 0 0 62 11 0 0 0 2
> MatMult MF 2928 1.0 5.7922e-01 1.0 2.83e+06 1.0 0.0e+00 0.0e+00 0.0e+00 16 5 0 0 0 16 5 0 0 0 5
> MatMult 2928 1.0 5.7963e-01 1.0 2.83e+06 1.0 0.0e+00 0.0e+00 0.0e+00 16 5 0 0 0 16 5 0 0 0 5
> MatSolve 2894 1.0 7.3171e-03 1.0 1.76e+07 1.0 0.0e+00 0.0e+00 0.0e+00 0 33 0 0 0 0 33 0 0 0 2405
> MatLUFactorNum 573 1.0 1.4733e-02 1.0 1.71e+07 1.0 0.0e+00 0.0e+00 0.0e+00 0 32 0 0 0 0 32 0 0 0 1158
> MatILUFactorSym 1 1.0 2.4543e-05 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
> MatAssemblyBegin 1147 1.0 7.9204e-05 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
> MatAssemblyEnd 1147 1.0 2.5825e-03 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
> MatGetRowIJ 2 1.0 6.3280e-06 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
> MatGetOrdering 1 1.0 1.5754e-05 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
> MatZeroEntries 573 1.0 5.7120e-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
> MatFDColorCreate 1 1.0 2.0541e-05 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
> MatFDColorSetUp 1 1.0 1.6103e-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
> MatFDColorApply 573 1.0 2.2386e+00 1.0 5.60e+06 1.0 0.0e+00 0.0e+00 0.0e+00 62 11 0 0 0 62 11 0 0 0 2
> MatFDColorFunc 11460 1.0 2.2264e+00 1.0 1.85e+06 1.0 0.0e+00 0.0e+00 0.0e+00 62 3 0 0 0 62 3 0 0 0 1
> MatColoringApply 1 1.0 3.9990e-05 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
> KSPGMRESOrthog 2321 1.0 2.9685e-03 1.0 5.75e+06 1.0 0.0e+00 0.0e+00 0.0e+00 0 11 0 0 0 0 11 0 0 0 1935
> KSPSetUp 573 1.0 2.3291e-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
> KSPSolve 573 1.0 5.0164e-01 1.0 4.50e+07 1.0 0.0e+00 0.0e+00 0.0e+00 14 85 0 0 0 14 85 0 0 0 90
> PCSetUp 573 1.0 1.5172e-02 1.0 1.71e+07 1.0 0.0e+00 0.0e+00 0.0e+00 0 32 0 0 0 0 32 0 0 0 1124
> PCApply 2894 1.0 7.8614e-03 1.0 1.76e+07 1.0 0.0e+00 0.0e+00 0.0e+00 0 33 0 0 0 0 33 0 0 0 2239
> ------------------------------------------------------------------------------------------------------------------------
>
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