[petsc-users] how to simultaneously perform the partition of the unstructured mesh and reduction bandwidth of the resulting sparsematrix

[Jed Brown]

丁老师 <ztdepyahoo at 163.com> writes:

> which petsc function perform the reordering of the matrix

MatGetOrdering() gives you the permutation vectors.

You should be doing this reordering with the *mesh*.  You can represent
mesh connectivity in a matrix and use MatPartitioning and
MatGetOrdering, but you should use the result to redistribute the mesh
before assembling the matrices containing your physics.
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