2: static char help[] = "Tests for bugs in A->offloadmask consistency for GPU matrices\n\n";

  4:  #include <petscmat.h>

  6: int main(int argc,char **args)
  7: {
  8:   Mat            A;
  9:   PetscInt       i,j,rstart,rend,m = 3;
 10:   PetscScalar    one = 1.0,zero = 0.0,negativeone = -1.0;
 11:   PetscReal      norm;
 12:   Vec            x,y;

 15:   PetscInitialize(&argc,&args,(char*)0,help);if (ierr) return ierr;
 16:   PetscOptionsGetInt(NULL,NULL,"-m",&m,NULL);

 18:   for (i=0; i<2; i++) {
 19:     /* Create the matrix and set it to contain explicit zero entries on the diagonal. */
 20:     MatCreate(PETSC_COMM_WORLD,&A);
 21:     MatSetSizes(A,PETSC_DECIDE,PETSC_DECIDE,m*m,m*m);
 22:     MatSetFromOptions(A);
 23:     MatSetUp(A);
 24:     MatGetOwnershipRange(A,&rstart,&rend);
 25:     MatCreateVecs(A,&x,&y);
 26:     VecSet(x,one);
 27:     VecSet(y,zero);
 28:     MatDiagonalSet(A,y,INSERT_VALUES);

 30:     /* Now set A to be the identity using various approaches.
 31:      * Note that there may be other approaches that should be added here. */
 32:     switch (i) {
 33:     case 0:
 34:       MatDiagonalSet(A,x,INSERT_VALUES);
 35:       break;
 36:     case 1:
 37:       for (j=rstart; j<rend; j++) {
 38:         MatSetValue(A,j,j,one,INSERT_VALUES);
 39:       }
 40:       MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);
 41:       MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);
 42:       break;
 43:     case 2:
 44:       for (j=rstart; j<rend; j++) {
 45:         MatSetValuesRow(A,j,&one);
 46:       }
 47:       MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);
 48:       MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);
 49:     default:
 50:       break;
 51:     }

 53:     /* Compute y <- A*x and verify that the difference between y and x is negligible, as it should be since A is the identity. */
 54:     MatMult(A,x,y);
 55:     VecAXPY(y,negativeone,x);
 56:     VecNorm(y,NORM_2,&norm);
 57:     if (norm > PETSC_SQRT_MACHINE_EPSILON) {
 58:       PetscPrintf(PETSC_COMM_WORLD,"Test %d: Norm of error is %g, but should be near 0.\n",i,(double)norm);
 59:     }

 61:     MatDestroy(&A);
 62:     VecDestroy(&x);
 63:     VecDestroy(&y);
 64:   }

 66:   PetscFinalize();
 67:   return ierr;
 68: }


 71: /*TEST

 73:    test:
 74:       suffix: aijviennacl_1
 75:       nsize: 1
 76:       args: -mat_type aijviennacl
 77:       requires: viennacl

 79:    test:
 80:       suffix: aijviennacl_2
 81:       nsize: 2
 82:       args: -mat_type aijviennacl
 83:       requires: viennacl

 85:    test:
 86:       suffix: aijcusparse_1
 87:       nsize: 1
 88:       args: -mat_type aijcusparse
 89:       requires: cuda

 91:    test:
 92:       suffix: aijcusparse_2
 93:       nsize: 2
 94:       args: -mat_type aijcusparse
 95:       requires: cuda
 96: TEST*/