Hi,
I am trying to use block Jacobi preconditioner in SNES (SNESNEWTONLS).
However, PCBJacobiGetSubKSP function returns an error stating "Object is
in wrong state, Must call KSPSetUp() or PCSetUp() first". When I add
KSPSetUp, I got and error from them as: "Must call
DMShellSetGlobalVector() or DMShellSetCreateGlobalVector()", and if
PCSetUp is added, "Object is in wrong state, Matrix must be set first"
error is printed.
Below is a part of my code. It is run serially. Any help is much
appreciated.
ierr = SNESGetKSP(snes, &Petsc_ksp);
CHKERRQ(ierr);
ierr = KSPGetPC(Petsc_ksp, &Petsc_pc);
CHKERRQ(ierr);
ierr = KSPSetTolerances(Petsc_ksp, 1.e-3, 1e-3, PETSC_DEFAULT, 20000);
CHKERRQ(ierr);
ierr = SNESSetTolerances(snes, 1e-1, 1e-1, 1e-1, 2000, 2000);
CHKERRQ(ierr);
ierr = SNESSetType(snes, SNESNEWTONLS);
CHKERRQ(ierr);
ierr = KSPSetType(Petsc_ksp, KSPGMRES);
CHKERRQ(ierr);
ierr = PCSetType(Petsc_pc, PCBJACOBI);
CHKERRQ(ierr);
ierr = PCSetType(Petsc_pc, PCBJACOBI);
CHKERRQ(ierr);
ierr = PCBJacobiSetTotalBlocks(Petsc_pc, 2*Nx*Ny*Nz, SadeqSize);
CHKERRQ(ierr);
SNESSetUp(snes);
CHKERRQ(ierr);
ierr = PCBJacobiGetSubKSP(Petsc_pc, &nLocal, &Firstly, &subKSP);
CHKERRQ(ierr);
for (i = 0; i < nLocal; i++) {
ierr = KSPGetPC(subKSP[i], &SubPc);
CHKERRQ(ierr);
ierr = PCSetType(SubPc, PCLU);
CHKERRQ(ierr);
ierr = PCFactorSetMatSolverPackage(SubPc, "mkl_pardiso");
CHKERRQ(ierr);
ierr = KSPSetType(subKSP[i], KSPPREONLY);
CHKERRQ(ierr);
ierr = KSPSetTolerances(subKSP[i], 1.e-6, PETSC_DEFAULT,
PETSC_DEFAULT, PETSC_DEFAULT);
CHKERRQ(ierr);
}
ierr = SNESSolve(snes, NULL, Petsc_X);
CHKERRQ(ierr);
--
Ali Reza Khaz’ali
Assistant Professor of Petroleum Engineering,
Department of Chemical Engineering
Isfahan University of Technology
Isfahan, Iran
