On Thu, Apr 14, 2011 at 05:48, Shiyuan <gshy2014 at gmail.com> wrote:
> I have two matrices A, B of different nonzero-pattern. Their size is about > 60k*60k. I notices that MATAXPY() is extremely slow. What matrix format and what are you passing for MatStructure? With DIFFERENT_NONZERO_STRUCTURE, petsc-3.1 was not doing preallocation. This is fixed in petsc-dev. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20110414/c3b5d2d3/attachment.htm>
