I want to solve Stokes equation using user defined schur complement preconditioner. So I'm reading and testing snes/examples/tutorial/ex55.c, and ex70.c. In these examples, there are comments about the usage, for example:
mpiexec -n 2 ./stokes -nx 32 -ny 48 -fieldsplit_1_user_pc. However the option -fieldsplit_1_user_pc is not recognized by the executable. The output of the above command is: residual u = 2.6315e-05 residual p = 0.000229872 residual [u,p] = 0.000231373 discretization error u = 0.00633503 discretization error p = 0.121534 discretization error [u,p] = 0.121699 WARNING! There are options you set that were not used! WARNING! could be spelling mistake, etc! Option left: name:-fieldsplit_1_user_pc (no value) I'm wondering what's going on. Is that because I need some specific options during my configuring of the package? By the way, the version of PETSc I'm using is 3.4.4. Best, Hui
