[petsc-users] Newbie Question - Really slow - PetscMemCpy

[Jed Brown]

On Thu, 22 Apr 2010 15:11:46 +0200, Jed Brown <jed at 59A2.org> wrote:
> Yes, if you call MatSeqBAIJSetPreallocation() with a MATSEQAIJ, then you
> have not preallocated anything.

But note that when you called MatCreateSeqBAIJ(), your sparsity was
actually used (and interpreted as BAIJ).  Since this still had poor
performance, there is still something wrong with the sparsity.

Jed