[petsc-users] Mat_CheckInode

[Debao Shao]

DA,



1, Will check_inode affect the runtime performance? For example, in my case, there are such different logs:

     [0] Mat_CheckInode(): Found 18602 nodes out of 18609 rows. Not using Inode routines

     [0] Mat_CheckInode(): Found 0 nodes of 0. Limit used: 5. Using Inode routines

     [0] Mat_CheckInode(): Found 14020 nodes out of 14020 rows. Not using Inode routines



2, Here is the log_summary, looks like PCSetup is big time-consuming function, the method I'm using is ILU(1) & GMRES, may I improve it?

     MatMult            30733 1.0 8.9553e+01 1.0 3.41e+10 1.0 0.0e+00 0.0e+00 0.0e+00  2  4  0  0  0   2  4  0  0  0   380

     MatMultAdd          9552 1.0 6.6610e+00 1.0 2.42e+09 1.0 0.0e+00 0.0e+00 0.0e+00  0  0  0  0  0   0  0  0  0  0   363

     MatSolve           36236 1.0 2.4699e+02 1.0 9.44e+10 1.0 0.0e+00 0.0e+00 0.0e+00  6 10  0  0  0   6 10  0  0  0   382

     MatLUFactorNum      2838 1.0 2.4328e+03 1.0 7.65e+11 1.0 0.0e+00 0.0e+00 0.0e+00 61 85  0  0  0  61 85  0  0  0   315

     MatILUFactorSym      173 1.0 1.3486e+02 1.0 0.00e+00 0.0 0.0e+00 0.0e+00 0.0e+00  3  0  0  0  0   3  0  0  0  0     0

     MatAssemblyBegin    5787 1.0 2.0547e-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

     MatAssemblyEnd      5787 1.0 5.3559e+00 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     30679 1.0 5.5968e+00 1.0 4.06e+09 1.0 0.0e+00 0.0e+00 0.0e+00  0  0  0  0  0   0  0  0  0  0   725

     KSPSetup            2838 1.0 1.8219e-02 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            5503 1.0 2.9136e+03 1.0 8.99e+11 1.0 0.0e+00 0.0e+00 0.0e+00 73100  0  0  0  73100  0  0  0   308

     PCSetUp             2838 1.0 2.5682e+03 1.0 7.65e+11 1.0 0.0e+00 0.0e+00 0.0e+00 64 85  0  0  0  64 85  0  0  0   298

     PCApply            36236 1.0 2.4709e+02 1.0 9.44e+10 1.0 0.0e+00 0.0e+00 0.0e+00  6 10  0  0  0   6 10  0  0  0   382

The matrix size is around 50000*50000, nnz is ~2000000



3, Will the fill of ilu affect the runtime performance?

     [0] MatILUFactorSymbolic_SeqAIJ(): Reallocs 0 Fill ratio:given 1 needed 1.11111

     [0] MatILUFactorSymbolic_SeqAIJ(): Reallocs 1 Fill ratio:given 1 needed 5.05

     [0] MatILUFactorSymbolic_SeqAIJ(): Reallocs 1 Fill ratio:given 1 needed 8.3410

How to set a proper value for fill, >8?



Thanks,

Debao

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