[petsc-dev] Scalability of removing null spaces

Jed Brown jedbrown at mcs.anl.gov
Sun Jul 22 13:19:52 CDT 2012

We recommend to people that they just call MatSetNullSpace() and solve the
singular system. What if reductions are very expensive? Are there Krylov
methods that accommodate a pipelined or deferred null space removal?
Shouldn't be hard to do, but I haven't seen papers on it.
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