Actual source code: ex34.c


  2: static char help[] = "Tests solving linear system with KSPFGMRES + PCSOR (omega != 1) on a matrix obtained from MatTransposeMatMult.\n\n";

  4: #include <petscksp.h>

  6: int main(int argc, char **args)
  7: {
  8:   Mat       A, Ad, B;
  9:   PetscInt  N = 10, M = 3;
 10:   PetscBool no_inodes = PETSC_TRUE, flg;
 11:   KSP       ksp;
 12:   PC        pc;
 13:   Vec       x, y;
 14:   char      mtype[256];

 16:   PetscFunctionBeginUser;
 17:   PetscCall(PetscInitialize(&argc, &args, (char *)0, help));
 18:   PetscCall(PetscOptionsGetInt(NULL, NULL, "-N", &N, NULL));
 19:   PetscCall(PetscOptionsGetInt(NULL, NULL, "-M", &M, NULL));
 20:   PetscCall(PetscOptionsGetString(NULL, NULL, "-mtype", mtype, sizeof(mtype), &flg));
 21:   PetscCall(PetscOptionsGetBool(NULL, NULL, "-no_inodes", &no_inodes, NULL));
 22:   PetscCall(MatCreateDense(PETSC_COMM_WORLD, PETSC_DECIDE, PETSC_DECIDE, M, N, NULL, &Ad));
 23:   PetscCall(MatSetRandom(Ad, NULL));
 24:   PetscCall(MatConvert(Ad, flg ? mtype : MATAIJ, MAT_INITIAL_MATRIX, &A));
 25:   PetscCall(MatProductCreate(A, A, NULL, &B));
 26:   PetscCall(MatProductSetType(B, MATPRODUCT_AtB));
 27:   PetscCall(MatProductSetAlgorithm(B, "default"));
 28:   PetscCall(MatProductSetFill(B, PETSC_DEFAULT));
 29:   PetscCall(MatProductSetFromOptions(B));
 30:   PetscCall(MatProductSymbolic(B));
 31:   if (no_inodes) PetscCall(MatSetOption(B, MAT_USE_INODES, PETSC_FALSE));
 32:   PetscCall(MatProductNumeric(B));
 33:   PetscCall(MatTransposeMatMultEqual(A, A, B, 10, &flg));
 34:   if (!flg) PetscCall(PetscPrintf(PETSC_COMM_WORLD, "Wrong MatTransposeMat"));
 35:   PetscCall(KSPCreate(PETSC_COMM_WORLD, &ksp));
 36:   PetscCall(KSPSetOperators(ksp, B, B));
 37:   PetscCall(KSPGetPC(ksp, &pc));
 38:   PetscCall(PCSetType(pc, PCSOR));
 39:   PetscCall(PCSORSetOmega(pc, 1.1));
 40:   PetscCall(KSPSetUp(ksp));
 41:   PetscCall(KSPView(ksp, NULL));
 42:   PetscCall(KSPGetPC(ksp, &pc));
 43:   PetscCall(MatCreateVecs(B, &y, &x));
 44:   PetscCall(VecSetRandom(x, NULL));
 45:   PetscCall(PCApply(pc, x, y));
 46:   PetscCall(KSPDestroy(&ksp));
 47:   PetscCall(VecDestroy(&x));
 48:   PetscCall(VecDestroy(&y));
 49:   PetscCall(MatDestroy(&B));
 50:   PetscCall(MatDestroy(&Ad));
 51:   PetscCall(MatDestroy(&A));
 52:   PetscCall(PetscFinalize());
 53:   return 0;
 54: }

 56: /*TEST

 58:     test:
 59:       nsize: 1
 60:       suffix: 1

 62:     test:
 63:       nsize: 1
 64:       suffix: 1_mpiaij
 65:       args: -mtype mpiaij

 67:     test:
 68:       nsize: 3
 69:       suffix: 2

 71: TEST*/