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<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
Hi, I was wondering if anyone has experience on what combinations are more efficient to solve a Poisson problem derived from a 7 point stencil on a single mesh (serial).</div>
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I've been doing some tests of multigrid and cholesky on a 50^3 mesh. <b>-pc_type mg</b> takes about 75% more time than
<b>-pc_type cholesky -pc_factor_mat_solver_type cholmod</b> for the case I'm testing.</div>
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I'm new to PETSc so any suggestions are most welcome and appreciated,</div>
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Marcos<br>
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