[petsc-users] Reusing A00 block with Schur complement

[Mike Welland]

My A00 block in an SNES solve with a Schur complement preconditioner is
constant, and I'd like to exploit this for computational speedup. I'm
running PETSc through a FEM package (Firedrake) so only have ready access
to the options database (I believe that to be the command line arguments)

Is this automatically recognized or is there an option I can set?
Thanks
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