Dear all, I use petsc to solve a nonlinear convection-diffusion type equation in porous media. The built linear system's size is 30000 and its resolution lasts about a hour on a single processor machine (my laptop...). I run for that a hundred time steps and have in average 4 Newton iterations per time step. So a hour seems huge to me with the optimized version of Petsc. I tryed to profile my code with the options "-log_summary" and "-info". What i get out of it is that the first time step lasts about 15min representing 25% of the total time and i think its not normal. The thing is, these 15min happen at the second call of the petsc routine "VecScatterCreate()" right after the first Newton residual.
Any idea? Thanks. Stephane _________________________________________________________________ Show them the way! Add maps and directions to your party invites. http://www.microsoft.com/windows/windowslive/products/events.aspx -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20090224/c695a2bf/attachment.htm>
