[petsc-users] Solve of subdomains without connections

[Qin Lu]

Hello,
 
I am using PETSc ksp solver to solve a problem on a physical domain. The domain is splitted to subdomains in such a way that there is no connections between them, but I still have to solve the whole domain as a single linear system. My questions are:
 
1. Does PETSc detect that the matrix is a block diagonal matrix and solve it efficiently?
2. In parallel solve, each subdoamin is assigned to a separate process. Does PETSc solve the system efficiently by avoiding all the unnecessary parallel message passing since there is no connections between processes?
 
Thanks,
Qin
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