[petsc-users] Size of off-diagonal matrix

[John Fettig]

I'm having trouble understanding how the size of off-diagonal matrix
is determined in the MPIAIJ format.  For example, if I run on 2
processors the global size is 4177x4177, but the local matrices are

Rank 1:
2089x2089  (diagonal block)
2089x259  (off diagonal block)

Rank2:
2088x274  (off diagonal block)
2088x2088 (diagonal block)

Why isn't the off-diagonal block sized for all of the off-diagonal columns?

John