[petsc-dev] Is the ASM preconditioner algebraic or geometric in the context of DMPlex (unstructured) ?

[markwinpe]

Dear PETSc’s developers,
      In the context of unstructured applications developed by PETSc’s DMPlex, if the ASM is used for preconditioning, is it algebraic (based on matrix graph) or geometric (based on Metis partition)?  
    When the ASM preconditioner is associated with a specific DM object, I found there is  only the implementation of DMCreateDomainDecomposition for DA in PCSetUp_ASM, and there is no implementation for DMPlex. So I guess the ASM is algebraic for DMPlex, is that right ? 




Best,


Wenpeng
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