tree c999f6d2abd7ed6b5d8e0b0e44dca1981c1845c9
parent 263de47419167786c9ab6d93fa2f3e32e8e75fe1
author Sameer Agarwal <sameeragarwal@google.com> 1378186120 -0700
committer Sameer Agarwal <sameeragarwal@google.com> 1378186919 -0700

ITERATIVE_SCHUR works with no f-blocks.

When the Schur complement is of size zero,
i.e. none of the parameter blocks interact
with each other, the ITERATIVE_SCHUR linear
solver crashes due to some checks that are
triggered in the SCHUR_JACOBI preconditioner.

This patch adds logic to detect this condition
and to deal with it and adds tests that verify
the fix.

Thanks to Soohyun Bae for reporting this bug.

Change-Id: If29ddf32463cbb1960414fff0e29bbf0d2ee7989