[petsc-users] structure of A

[Massoud Rezavand]

Dear PETSc team,

Sorry if my question is more related to math.
Using PETSc, how important is the structure of the matrix A for
performance? I mean mainly the diagonal and off-diagonal parts.

For example, solving with a matrix which is dense in diagonal part and
sparse in off-diagonal part is faster than with a matrix in which the
non-zeros are distributed randomly?

Thanks in advance.

Massoud
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