I think I figured it out ;) After thinking about your suggestion, Prof. Bangerth. It came to my mind, that the result of my max_rank variable is stored on a specific processor due to MPI_Reduce. That means I cannot access these data parts without being currently at the correspinding processor rank. For instance I store my results on rank 0, if I want to check the max_rank data on processor rank 3, it is empty. That is why I cannot get any output, because when rank 3 owns everything output works fine.
Now my question how can I store the data on all processors? Or how am I able to at least store my max_rank variable on all processors? BR, Seyed Ali -- The deal.II project is located at http://www.dealii.org/ For mailing list/forum options, see https://groups.google.com/d/forum/dealii?hl=en --- You received this message because you are subscribed to the Google Groups "deal.II User Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to dealii+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.