[petsc-users] Use block Jacobi preconditioner with SNES

[Ali Reza Khaz'ali]

>
> I mean directly build the preconditioner with the required block 
> diagonal structure. Then do don't need to use something like PCBJACOBI 
> or PCASM to extract the block diagonal operator from your original 
> operator.
>

I know the block structure. I saved the block sizes in SadeqSize array, 
and I was trying to tell PCBJACOBI to use it:

ierr = PCBJacobiSetTotalBlocks(Petsc_pc, 2*Nx*Ny*Nz, SadeqSize);

Which based on previous communications, it seems to be incompatible with 
SNES, and PCBJacobiSetTotalBlocks function returned an error.
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