Thank you Dr WolfGang for your reply. I do not know if I was clear in my email. I was only intending to check with you about this critical number of elements on the base mesh only when I am trying to generate hanging node mesh from the base mesh using p4est.
When I debug with ddt, the stack trace shows execute_coarsening_refinement calls p8est_refine which calls p8est_refine_ext which calles p8est_is_valid and finally it calls p8est_comm_sync_flag after it which it calls PMPI_Abort() and my code get aborted. This happens whenever I run more than 8procs. Here in this case, I have a base mesh with 64 elements and I try to adaptively refine to generate hanging node mesh using triangulation.execute_coarsening_and_refinement() after marking some cells for refinement. Thanks for your help Regards Phani On Sun, Dec 10, 2017 at 10:59 PM, Wolfgang Bangerth <[email protected]> wrote: > On 12/10/2017 08:38 PM, Phani Motamarri wrote: > >> >> I was just wondering in a MPI run, is there a critical number of >> finite-elements to be present in the base mesh on each processor when doing >> an adaptive refinement of the base mesh using p4est in deal ii. I had a >> base uniform mesh of 64 elements and when I try to do adaptive refinement >> using triangulation.execute_coarsening_and_refinement(), the code gets >> stuck at this function call when I run more than 8 processors. However, if >> the base mesh has 512 elements, the code gets stuck at the same function >> call when I run on 16 processors. >> > > No, there is no critical number. We have computed cases with one coarse > mesh cell and 10,000 processors, and with 30,000 coarse mesh cells and one > processor. > > You'll have to figure out in more detail what "stuck" concretely means. > For example, are all processors at the same location of your code, or are > one or more waiting in one location and the rest in another (the classical > case of a "deadlock"). > > Best > W. > > -- > ------------------------------------------------------------------------ > Wolfgang Bangerth email: [email protected] > www: http://www.math.colostate.edu/~bangerth/ > > -- > The deal.II project is located at http://www.dealii.org/ > For mailing list/forum options, see https://groups.google.com/d/fo > rum/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 [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- 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 [email protected]. For more options, visit https://groups.google.com/d/optout.
