Hello, I am profiling a finite element Navier-Stokes solver. It uses the Jacobian-free Newton Krylov method and a custom preconditoner LU-SGS (a matrix-free version of Symmetic Gauss-Seidel ). The log summary is attached. Four events are registered. compute_rhs is compute rhs (used by MatMult_MFFD). SURFINT and VOLINT are parts of compute_rhs. LU-SGS is the custom preconditioner. I didn't call PetscLogFlops so these flops are zeros.
I'm wondering, is the percent time of the events reasonable in the table? I see 69% time is spent on matmult_mffd. Is it expected in matrix-free method? What might be a good starting point of profiling this solver? Thank you in advance. Song Gao
log_summary
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