On Wed, Dec 7, 2011 at 06:31, Bogdan Dita <bogdan at lmn.pub.ro> wrote:
> A few weeks ago i posted a question regarding a problem with the > optimised version of PETSc, what i mean is that I obtained a higher > solving time with the optimised version then with the debug > version(~10-15% higher). > What do you get from 'mpicc -show'? MPICH2 has a tendency to put optimization flags into the wrappers. It's possible that the "optimized" build of PETSc is effectively using -O2 (from MPICH2) and -g3 (from PETSc with-debugging=1), which might be faster than -O2 (from MPICH2) -O (from PETSc with-debugging=0, taking precedence) that you get when you. You can use PETSc's --COPTFLAGS to set your own optimization flags for PETSc. Let us know if this works. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20111207/ca7b6515/attachment.htm>
