Actual source code: ex34.c

petsc-3.13.4 2020-08-01
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  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;
 10:   PetscInt       N = 10, M = 3;
 11:   PetscBool      no_inodes=PETSC_TRUE,flg;
 12:   KSP            ksp;
 13:   PC             pc;
 14:   Vec            x,y;
 15:   char           mtype[256];

 17:   PetscInitialize(&argc,&args,(char*)0,help);if (ierr) return ierr;
 18:   PetscOptionsGetInt(NULL,NULL,"-N",&N,NULL);
 19:   PetscOptionsGetInt(NULL,NULL,"-M",&M,NULL);
 20:   PetscOptionsGetString(NULL,NULL,"-mtype",mtype,256,&flg);
 21:   PetscOptionsGetBool(NULL,NULL,"-no_inodes",&no_inodes,NULL);
 22:   MatCreateDense(PETSC_COMM_WORLD,PETSC_DECIDE,PETSC_DECIDE,M,N,NULL,&Ad);
 23:   MatSetRandom(Ad,NULL);
 24:   MatConvert(Ad,flg ? mtype : MATAIJ,MAT_INITIAL_MATRIX,&A);
 25:   MatProductCreate(A,A,NULL,&B);
 26:   MatProductSetType(B,MATPRODUCT_AtB);
 27:   MatProductSetAlgorithm(B,"default");
 28:   MatProductSetFill(B,PETSC_DEFAULT);
 29:   MatProductSetFromOptions(B);
 30:   MatProductSymbolic(B);
 31:   if (no_inodes) {
 32:     MatSetOption(B,MAT_USE_INODES,PETSC_FALSE);
 33:   }
 34:   MatProductNumeric(B);
 35:   MatTransposeMatMultEqual(A,A,B,10,&flg);
 36:   if (!flg) {
 37:     PetscPrintf(PETSC_COMM_WORLD,"Wrong MatTransposeMat");
 38:   }
 39:   KSPCreate(PETSC_COMM_WORLD,&ksp);
 40:   KSPSetOperators(ksp,B,B);
 41:   KSPGetPC(ksp,&pc);
 42:   PCSetType(pc,PCSOR);
 43:   PCSORSetOmega(pc,1.1);
 44:   KSPSetUp(ksp);
 45:   KSPView(ksp,NULL);
 46:   KSPGetPC(ksp,&pc);
 47:   MatCreateVecs(B,&y,&x);
 48:   VecSetRandom(x,NULL);
 49:   PCApply(pc,x,y);
 50:   KSPDestroy(&ksp);
 51:   VecDestroy(&x);
 52:   VecDestroy(&y);
 53:   MatDestroy(&B);
 54:   MatDestroy(&Ad);
 55:   MatDestroy(&A);
 56:   PetscFinalize();
 57:   return ierr;
 58: }

 60: /*TEST

 62:     test:
 63:       nsize: 1
 64:       suffix: 1

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

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

 75: TEST*/