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:   PetscInitialize(&argc,&args,(char*)0,help);
 17:   PetscOptionsGetInt(NULL,NULL,"-N",&N,NULL);
 18:   PetscOptionsGetInt(NULL,NULL,"-M",&M,NULL);
 19:   PetscOptionsGetString(NULL,NULL,"-mtype",mtype,sizeof(mtype),&flg);
 20:   PetscOptionsGetBool(NULL,NULL,"-no_inodes",&no_inodes,NULL);
 21:   MatCreateDense(PETSC_COMM_WORLD,PETSC_DECIDE,PETSC_DECIDE,M,N,NULL,&Ad);
 22:   MatSetRandom(Ad,NULL);
 23:   MatConvert(Ad,flg ? mtype : MATAIJ,MAT_INITIAL_MATRIX,&A);
 24:   MatProductCreate(A,A,NULL,&B);
 25:   MatProductSetType(B,MATPRODUCT_AtB);
 26:   MatProductSetAlgorithm(B,"default");
 27:   MatProductSetFill(B,PETSC_DEFAULT);
 28:   MatProductSetFromOptions(B);
 29:   MatProductSymbolic(B);
 30:   if (no_inodes) {
 31:     MatSetOption(B,MAT_USE_INODES,PETSC_FALSE);
 32:   }
 33:   MatProductNumeric(B);
 34:   MatTransposeMatMultEqual(A,A,B,10,&flg);
 35:   if (!flg) {
 36:     PetscPrintf(PETSC_COMM_WORLD,"Wrong MatTransposeMat");
 37:   }
 38:   KSPCreate(PETSC_COMM_WORLD,&ksp);
 39:   KSPSetOperators(ksp,B,B);
 40:   KSPGetPC(ksp,&pc);
 41:   PCSetType(pc,PCSOR);
 42:   PCSORSetOmega(pc,1.1);
 43:   KSPSetUp(ksp);
 44:   KSPView(ksp,NULL);
 45:   KSPGetPC(ksp,&pc);
 46:   MatCreateVecs(B,&y,&x);
 47:   VecSetRandom(x,NULL);
 48:   PCApply(pc,x,y);
 49:   KSPDestroy(&ksp);
 50:   VecDestroy(&x);
 51:   VecDestroy(&y);
 52:   MatDestroy(&B);
 53:   MatDestroy(&Ad);
 54:   MatDestroy(&A);
 55:   PetscFinalize();
 56:   return 0;
 57: }

 59: /*TEST

 61:     test:
 62:       nsize: 1
 63:       suffix: 1

 65:     test:
 66:       nsize: 1
 67:       suffix: 1_mpiaij
 68:       args: -mtype mpiaij

 70:     test:
 71:       nsize: 3
 72:       suffix: 2

 74: TEST*/