Andrea Lani <[email protected]> writes: > I want to use KSPGMRES
With what inside? Jacobi? Your outer solve was GMRES, which requires a linear preconditioner. That implies fully converging the subdomain solver when using an iterative method. This is likely to be inefficient, in which case you'd probably want to switch to FGMRES or GCR for the outer KSP. I don't know how difficult it will be to make BJacobi support GPUs. Could be easy, but someone has to write the code. Karl or Dominic, have you looked at this?
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