"Kirk, Benjamin (JSC-EG311)" <benjamin.kirk-1 at nasa.gov> writes:
> I've got a BAIJ matrix with block size 5 for a compressible flow > application. > > I am curious, when using -pc_type Jacobi what is actually applied as > the "diagonal" in the preconditioner? > > That is, for block matrix K, I assume the Jacobi preconditioner > extracts the diagonal values K_ii, but is this the scalar diagonal, or > the 5x5 block-diagonal matrix? -pc_type jacobi : scalar diagonal -pc_type pbjacobi: point-block diagonal (the 5x5 blocks)
