"Young, Matthew, Adam" <[email protected]> writes: > Is there an advantage to using MatXAIJSetPreallocation (as Jed > suggested) or either of the SEQ/MPI preallocation routines (as Hui > originally considered) instead of calling MatSetUp to cover all cases?
If you don't preallocate, MatSetUp guesses: http://www.mcs.anl.gov/petsc/documentation/faq.html#efficient-assembly
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