Actual source code: ex41.c


  2: static char help[] = "Tests MatIncreaseOverlap() - the parallel case. This example\n\
  3: is similar to ex40.c; here the index sets used are random. Input arguments are:\n\
  4:   -f <input_file> : file to load.  For example see $PETSC_DIR/share/petsc/datafiles/matrices\n\
  5:   -nd <size>      : > 0  no of domains per processor \n\
  6:   -ov <overlap>   : >=0  amount of overlap between domains\n\n";

  8: #include <petscmat.h>

 10: int main(int argc,char **args)
 11: {
 12:   PetscInt       nd = 2,ov=1,i,j,m,n,*idx,lsize;
 13:   PetscMPIInt    rank;
 14:   PetscBool      flg;
 15:   Mat            A,B;
 16:   char           file[PETSC_MAX_PATH_LEN];
 17:   PetscViewer    fd;
 18:   IS             *is1,*is2;
 19:   PetscRandom    r;
 20:   PetscScalar    rand;

 22:   PetscInitialize(&argc,&args,(char*)0,help);
 23:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
 24:   PetscOptionsGetString(NULL,NULL,"-f",file,sizeof(file),NULL);
 25:   PetscOptionsGetInt(NULL,NULL,"-nd",&nd,NULL);
 26:   PetscOptionsGetInt(NULL,NULL,"-ov",&ov,NULL);

 28:   /* Read matrix and RHS */
 29:   PetscViewerBinaryOpen(PETSC_COMM_WORLD,file,FILE_MODE_READ,&fd);
 30:   MatCreate(PETSC_COMM_WORLD,&A);
 31:   MatSetType(A,MATMPIAIJ);
 32:   MatLoad(A,fd);
 33:   PetscViewerDestroy(&fd);

 35:   /* Read the matrix again as a seq matrix */
 36:   PetscViewerBinaryOpen(PETSC_COMM_SELF,file,FILE_MODE_READ,&fd);
 37:   MatCreate(PETSC_COMM_SELF,&B);
 38:   MatSetType(B,MATSEQAIJ);
 39:   MatLoad(B,fd);
 40:   PetscViewerDestroy(&fd);

 42:   /* Create the Random no generator */
 43:   MatGetSize(A,&m,&n);
 44:   PetscRandomCreate(PETSC_COMM_SELF,&r);
 45:   PetscRandomSetFromOptions(r);

 47:   /* Create the IS corresponding to subdomains */
 48:   PetscMalloc1(nd,&is1);
 49:   PetscMalloc1(nd,&is2);
 50:   PetscMalloc1(m ,&idx);

 52:   /* Create the random Index Sets */
 53:   for (i=0; i<nd; i++) {
 54:     for (j=0; j<rank; j++) {
 55:       PetscRandomGetValue(r,&rand);
 56:     }
 57:     PetscRandomGetValue(r,&rand);
 58:     lsize = (PetscInt)(rand*m);
 59:     for (j=0; j<lsize; j++) {
 60:       PetscRandomGetValue(r,&rand);
 61:       idx[j] = (PetscInt)(rand*m);
 62:     }
 63:     ISCreateGeneral(PETSC_COMM_SELF,lsize,idx,PETSC_COPY_VALUES,is1+i);
 64:     ISCreateGeneral(PETSC_COMM_SELF,lsize,idx,PETSC_COPY_VALUES,is2+i);
 65:   }

 67:   MatIncreaseOverlap(A,nd,is1,ov);
 68:   MatIncreaseOverlap(B,nd,is2,ov);

 70:   /* Now see if the serial and parallel case have the same answers */
 71:   for (i=0; i<nd; ++i) {
 72:     PetscInt sz1,sz2;
 73:     ISEqual(is1[i],is2[i],&flg);
 74:     ISGetSize(is1[i],&sz1);
 75:     ISGetSize(is2[i],&sz2);
 77:   }

 79:   /* Free Allocated Memory */
 80:   for (i=0; i<nd; ++i) {
 81:     ISDestroy(&is1[i]);
 82:     ISDestroy(&is2[i]);
 83:   }
 84:   PetscRandomDestroy(&r);
 85:   PetscFree(is1);
 86:   PetscFree(is2);
 87:   MatDestroy(&A);
 88:   MatDestroy(&B);
 89:   PetscFree(idx);
 90:   PetscFinalize();
 91:   return 0;
 92: }

 94: /*TEST

 96:    build:
 97:       requires: !complex

 99:    test:
100:       nsize: 3
101:       requires: datafilespath double !defined(PETSC_USE_64BIT_INDICES) !complex
102:       args: -f ${DATAFILESPATH}/matrices/arco1 -nd 3 -ov 1

104: TEST*/