Hello. When I use PETSc, when I use PETSc, the program can run smoothly when calculating the coarse grid(getARGV(“-global”, 128)). When the grid is refined(getARGV(“-global”, 2048)), PETSc calculates very slowly and reports an error. why?
space.edp (1.7 KB)
Use more MPI processes, or switch to a preconditioned iterative method instead of an exact LU solver.
Thank you for your answer. I tried the iterative method, which can be calculated, but when the grid is refined to h = 1 / 256, an error will still be reported; Can you provide the example of adding MPI process under PETSc mentioned above? thank you
ff-mpirun -n X script.edp , with an increasing X.
That means the problem is too big for your machine, you’ll need to switch to a cluster.
