> On 27 Jul 2016, at 03:54, Safin, Artur <aks084...@utdallas.edu> wrote: > > Barry, > >> Do you have a call to KSPSetFromOptions() before the call >> PCFieldSplitGetSubKSP()? I am guessing not which means that the PC does not >> yet know that it is of type fieldplit. > > Yes, I call KSPSetFromOptions() for the global matrix at the beginning of the > code. Should I also do it for the ksp I obtain from PCFieldSplitGetSubKSP()? > > The program has no problem doing fieldsplit for the global matrix; my issue > is that I cannot get it to recognize a fieldsplit within a fieldsplit.
I think the SubKSPs (and therefore SubPCs) are not set up until you call KSPSetUp(ksp) which your code does not do explicitly and is therefore done in KSPSolve. Cheers, Lawrence
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