I'm making a big mistake then. I thought step-4 and step-40's only difference are parallel distributed triangulation and handing ghost dofs. Thank you.
Best, Wayne 在2023年2月23日星期四 UTC+8 22:32:39<Wolfgang Bangerth> 写道： > > yy.wayne: > > > I'm using mumps and superludist through Trilinos' Amesos wrapper > directly. > > The code is simple, just step4 with TrilinosWrappers:SparseMatrix and > > LinearAlgebra::distributed:Vector. > > Here's the result from my virtual machine for a 98k DoFs problem. > > Snipaste_2023-02-23_18-31-08.png > > > > I've test a 300k+ DoFs problem with Amesos_mumps on server as well. > > Multiple processes is not faster than one process. > > It's not clear to me what you are doing. step-4 is not parallel, and > unless > you extended it like we show in step-40, for example, all that happens > when > you run the program with > mpirun -np 4 ./step-4 > is that the same program is run four times on four different processes, > but > all these four copies do is run the exact same instructions. This might > also > explain why you see the output printed multiple times. If that is so, you > shouldn't be surprised that that takes exactly as long as running one > instance. > > If you want to test these kinds of solvers, start with step-40. > > Best > W. > > -- > ------------------------------------------------------------------------ > Wolfgang Bangerth email: bang...@colostate.edu > 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/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. To view this discussion on the web visit https://groups.google.com/d/msgid/dealii/895445e9-c71f-4a14-a5d8-5c2e24919686n%40googlegroups.com.
