[petsc-users] Profile a matrix-free solver.

[Song Gao]

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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20160114/87145b98/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: log_summary
Type: application/octet-stream
Size: 9058 bytes
Desc: not available
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20160114/87145b98/attachment.obj>