On Wed, Aug 31, 2011 at 07:52, Dominik Szczerba <dominik at itis.ethz.ch>wrote:
> I am getting the below cited error for a big linear problem. Would > that mean int overflow and indicate the need for > --with-64-bit-indices? > Yes, likely. > Obviously it will elevate the memory > requirements, but will it also reduce the performance? > Try it. Performance for sparse linear algebra is mostly limited by memory already. Using 64-bit indices increases the cost per nonzero in AIJ format, sizeof(PetscScalar)+sizeof(PetscInt), typically from 12 to 16 bytes. If you use BAIJ, the 64-bit indices will make much less difference. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20110831/91039e29/attachment.htm>
