Re: pc_factor_fill

[Zhifeng Sheng <z.sheng@xxxxxxxxxxxxxx>]

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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try


	*-pc_factor_fill <nfill>*


it works for me:)