Hello, thank you for the answer. I suppose, that the next step will be an solver for general systems, like TrilinosWrappers::SolverBicgstab or TrilinosWrappers::SolverGMRES ?
M 2016-07-21 21:39 GMT+02:00 Bruno Turcksin <bruno.turck...@gmail.com>: > Marek, > > On Thursday, July 21, 2016 at 3:17:48 PM UTC-4, Marek Čapek wrote: >> >> >> Hello, >> I have set up the Navier-Stokes-Cahn-Hilliard system in way of >> step-40 with TrilinosWrappers backend. >> I have assembled the phase-field part of system in reasonable time 3s, >> however >> the solve with Amesos_Superludist lasted cca 700s. >> I have cca 32768 cells, >> 71874 dofs for Cahn-Hilliard part of system, cca 2000-3000 dofs per >> computer core >> I have used together 32 cores as the Navier Stokes part has 2773956 dofs >> (approximately 85000 dofs per core). I have heard that reasonable limit >> of the size >> of linear system for any direct solver is 100 000 unknows. >> > You are solving a system of more than 2.7 millions of unknowns with a > direct solver but you say yourself that a reasonable limit for a direct > solver is 100 000 unknowns (this rule of thumb does not scale linearly with > the number of processors). Your system is too big to be efficiently solved > using a direct solver. I think that the performance you get from SuperLU is > pretty good. > > Best, > > Bruno > > -- > 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. > -- 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.
