Dear Petsc developers,
in my application I have to solve millions of linear and non-linear
systems with small matrices (2x2, 3x3,..., 10x10).
I consider them as dense, and use SNES with KSP method PREONLY, and LU
preconditioner.
I found that when KSPSolve is called only 25% of time is spend in
Hello all,
I finally implemented the TS routine operating in several DAs at the same
time, hacking it as you suggested. I still have a problem with my algorithm
though. It is not DMDA related so there's that.
My algorithm needs to update u,v,w with information from the updated
T,S,rho. My problem
Respected Petsc developers
Hi,
I am currently using SNES to solve some non-linear PDEs. The model is a
two-dimensional X-Y geometry. Because the magnitude of different physical
variables is too large, it is difficult to find the direction in Krylov
subspace, and the residual descends very slowly or
Thank you, Lawrence.
Cool! That's perfect!
Bests,
Marco Cisternino
Da: Lawrence Mitchell
Inviato: martedì 24 settembre 2019 13:59
A: Marco Cisternino
Cc: petsc-users
Oggetto: Re: [petsc-users] Multiple linear solver defined at command line
Dear Marco,
Good morning,
in my code I need to solve 2 linear systems. I would like to use different
solvers for the 2 systems and most of all I would like to choose the single
solver by flags from command line, is it possible?
I can call PetscInitialize/PetscFinalize multiple times passing PetscInitialize