Hi PETSc team: I just want to get some clarifications on the use of preconditioners in PETSc.
Suppose I provide the Pmat as the second argument in KSPSetOperators as a user-specified matrix and it is different from Amat, the actual matrix to be solved. When I specify a preconditioner, say ASM, what does that mean? I am assuming that we are doing a preonly-type thing for solving Pmat, is that right? There is no iterative solver applied to Pmat over the iterations. Best, Mike
