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
