[deal.II] Multigrid in 3D questions

2022-03-03 Thread Lucas Myers
Hi folks, I'm trying to solve a 3D problem in parallel using an AMG preconditioner, but the performance is bad. I'm wondering if I can get some advice from someone who has experience choosing and tuning multigrid preconditioners, particularly for problems in 3D. For context: - The problem

Re: [deal.II] Error while building deal..II 9.2.0 - regd.

2022-03-03 Thread Wolfgang Bangerth
On 3/3/22 03:48, PUNITH M wrote: */apps/libs/Trillions-13.2/lib/libkokkoscore.a(Kokkos_Profiling.cpp.o): requires dynamic R_X86_64_32 reloc which may overflow at runtime; recompile with -fPIC* You will need to install Trilinos with shared libraries. Nothing should be built with static librari

[deal.II] Re: Assemble function, long time

2022-03-03 Thread Bruno Turcksin
Hermes, There is a couple of things that you could do but it probably won't give you a significant speed up. Are you sure that you are running in Release mode and not in Debug? Do you evaluate complicated functions in the assembly? A couple changes that could help: - don't use *fe.system_to_com

[deal.II] Error while building deal..II 9.2.0 - regd.

2022-03-03 Thread PUNITH M
Hello All, I'm trying to build deal.II 9.2.0 but it throwing an error like this */apps/libs/Trillions-13.2/lib/libkokkoscore.a(Kokkos_Profiling.cpp.o): requires dynamic R_X86_64_32 reloc which may overflow at runtime; recompile with -fPIC* I' ve used make option like this *cmake -DCMAKE_INSTALL

[deal.II] Assemble function, long time

2022-03-03 Thread Hermes Sampedro
Dear all, I am experiencing long times when computing the assembling and I would like to ask if this is common or there is something wrong with my implementation. My model is built in a similar way as step-29 and step-40 (using complex values ad solving with a direct solver using distributed p

[deal.II] Assembling

2022-03-03 Thread Hermes Sampedro
Dear all, I am experiencing long time to computee the assembling and I would like to ask if this is common or there is something wrong with my implementation. My model is built in a similar way as step-29 and step-40 (using complex values ad solving with a direct solver using distributed paral