[petsc-users] MatType BAIJ and Jacobi preconditioner

[Kirk, Benjamin (JSC-EG311)]

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?

Thanks,

-Ben