[petsc-users] Question about preallocation and getOwnership functions

[Jed Brown]

"Young, Matthew, Adam" <may at bu.edu> 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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