Oh, that's my fault. I assumed usage of Petsc or Trilinos just means parallel computations by default.
Thanks, Huan On Fri, 2010-04-02 at 04:49 -0500, Wolfgang Bangerth wrote: > Huan, > > > I have a question on the example of step-31. When I ran the program, I > > found the processors worked pretty independently, or asynchronously -- > > from what I read in the output. The time step numbers can vary quite a > > lot on different processors. (I am assuming this is normal. please > > correct me if not.) However, each time step is determined by the CFL > > condition, which needs the global info of the velocity to get the > > maximal velocity. This would require the faster processors to wait for > > the slower ones to finish so that they can determine the next time step, > > which contradicts my observation. > > I would greatly appreciate your explanations or thoughts. > > I am not entirely sure what you refer to: step-31 is a sequential program > and does not use multiple processors. Or what do I miss? > > Best > W. > > ------------------------------------------------------------------------- > Wolfgang Bangerth email: [email protected] > www: http://www.math.tamu.edu/~bangerth/ _______________________________________________ dealii mailing list http://poisson.dealii.org/mailman/listinfo/dealii
