Actual source code: ex95.c

  1: static char help[] = "Testing MatMerge_SeqsToMPI().\n\n";

 3:  #include petscmat.h

  7: int main(int argc,char **argv)
  8: {
  9:   Mat            A,B;
 10:   MatScalar      a[1],alpha;
 11:   PetscMPIInt    size,rank;
 12:   PetscInt       m,n,i,col, prid;

 15:   PetscInitialize(&argc,&argv,(char *)0,help);
 16:   MPI_Comm_size(PETSC_COMM_WORLD,&size);
 17:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
 18:   prid = size;
 19:   PetscOptionsGetInt(PETSC_NULL,"-prid",&prid,PETSC_NULL);

 21:   m = n = 10*size;
 22:   MatCreate(PETSC_COMM_SELF,PETSC_DETERMINE,PETSC_DETERMINE,m,n,&A);
 23:   MatSetType(A,MATSEQAIJ);

 25:   a[0] = rank+1;
 26:   for (i=0; i<m-rank; i++){
 27:     col = i+rank;
 28:     MatSetValues(A,1,&i,1,&col,a,INSERT_VALUES);
 29:   }
 30:   MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);
 31:   MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);
 32: 
 33:   if (rank == prid){
 34:     PetscPrintf(PETSC_COMM_SELF,"[%d] A: \n",rank);
 35:     MatView(A,PETSC_VIEWER_STDOUT_SELF);
 36:   }

 38:   /* Test MatMerge_SeqsToMPI */
 39:   MatMerge_SeqsToMPI(PETSC_COMM_WORLD,A,PETSC_DECIDE,PETSC_DECIDE,MAT_INITIAL_MATRIX,&B);

 41:   /* Test MAT_REUSE_MATRIX */
 42:   alpha = 0.1;
 43:   for (i=0; i<3; i++){
 44:     MatScale(&alpha,A);
 45:     MatMerge_SeqsToMPI(PETSC_COMM_WORLD,A,PETSC_DECIDE,PETSC_DECIDE,MAT_REUSE_MATRIX,&B);
 46:   }
 47:   MatView(B, PETSC_VIEWER_STDOUT_WORLD);
 48:   MatDestroy(B);
 49:   MatDestroy(A);
 50: 
 51:   PetscFinalize();
 52:   return(0);
 53: }