pc_factor_fill

[Barry Smith]

   PCFactorSetFill() after calling KSPSetPC()

    Barry

   If you are using multiple different KSP's you might look at  
KSPSetOptionsPrefix()
to allow using command line options to set different values for  
different solvers.

On Nov 22, 2007, at 5:46 AM, Waad Subber wrote:

> Hello PETSc Users,
>
> I have a serial code to solve multiple matrices. I am using LU  
> factorization. When I run the code  with the (-info) option, it  
> gives me different values for (pc_factor_fill) depending on the  
> input matrix. I am wondering if I can set these values for the  
> (pc_factor_fill) inside the code instead of running it with runtime  
> option, for it is one code with multiple inputs.
>
> Thanks a lot
>
> Waad
>
>
> For Matrix No.1
>
> [5] MatLUFactorSymbolic_SeqAIJ(): Reallocs 3 Fill ratio:given 0  
> needed 2.96
> [5] MatLUFactorSymbolic_SeqAIJ(): Run with -pc_factor_fill 2.96 or use
> [5] MatLUFactorSymbolic_SeqAIJ(): PCFactorSetFill(pc,2.96);
> [5] MatLUFactorSymbolic_SeqAIJ(): for best performance.
>
> For Matrix No.2
>
> [9] MatLUFactorSymbolic_SeqAIJ(): Reallocs 3 Fill ratio:given 0  
> needed 2.42069
> [9] MatLUFactorSymbolic_SeqAIJ(): Run with -pc_factor_fill 2.42069  
> or use
> [9] MatLUFactorSymbolic_SeqAIJ(): PCFactorSetFill(pc,2.42069);
> [9] MatLUFactorSymbolic_SeqAIJ(): for best performance.
>
> For Matrix No. n
>
> [8] MatLUFactorSymbolic_SeqAIJ(): Reallocs 3 Fill ratio:given 0  
> needed 1.87742
> [8] MatLUFactorSymbolic_SeqAIJ(): Run with -pc_factor_fill 1.87742  
> or use
> [8] MatLUFactorSymbolic_SeqAIJ(): PCFactorSetFill(pc,1.87742);
> [8] MatLUFactorSymbolic_SeqAIJ(): for best performance.
>
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