[petsc-users] Structured (DMDA) vs Unstructured (DMPlex) meshes

Miguel Angel Salazar de Troya miguel.salazar at corintis.com
Mon Jul 17 11:42:10 CDT 2023


I am trying to understand if I should make the effort to make my code use
structured meshes instead of unstructured ones. My domain is cartesian so
that is the first check for structured meshes. However, the problem size I
am looking at is ~20 million degrees of freedom. My understanding is that
for this problem size, most of the time is spent on the solver. In this
case, do structured meshes still have an advantage? Can they run Krylov
methods faster than when using structured meshes? What about other solvers
and preconditioners?

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