Actual source code: ex86.c

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

  3: #include <petscmat.h>
  4: int main(int argc,char **argv)
  5: {
  6:   Mat            seqmat,mpimat;
  7:   PetscMPIInt    rank;
  8:   PetscScalar    value[3],*vals;
  9:   PetscInt       i,col[3],n=5,bs=1;

 11:   PetscInitialize(&argc,&argv,(char*)0,help);
 12:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
 13:   PetscOptionsGetInt(NULL,NULL,"-bs",&bs,NULL);

 15:   /* Create seqaij matrices of size (n+rank) by n */
 16:   MatCreate(PETSC_COMM_SELF,&seqmat);
 17:   MatSetSizes(seqmat,(n+rank)*bs,PETSC_DECIDE,PETSC_DECIDE,n*bs);
 18:   MatSetFromOptions(seqmat);
 19:   MatSeqAIJSetPreallocation(seqmat,3*bs,NULL);
 20:   MatSeqBAIJSetPreallocation(seqmat,bs,3,NULL);

 22:   if (bs == 1) {
 23:     value[0] = -1.0; value[1] = 2.0; value[2] = -1.0;
 24:     for (i=1; i<n-1; i++) {
 25:       col[0] = i-1; col[1] = i; col[2] = i+1;
 26:       MatSetValues(seqmat,1,&i,3,col,value,INSERT_VALUES);
 27:     }
 28:     i = n - 1; col[0] = n - 2; col[1] = n - 1;
 29:     MatSetValues(seqmat,1,&i,2,col,value,INSERT_VALUES);

 31:     i = 0; col[0] = 0; col[1] = 1; value[0] = 2.0; value[1] = -1.0;
 32:     MatSetValues(seqmat,1,&i,2,col,value,INSERT_VALUES);
 33:   } else {
 34:     PetscInt *rows,*cols,j;
 35:     PetscMalloc3(bs*bs,&vals,bs,&rows,bs,&cols);
 36:     /* diagonal blocks */
 37:     for (i=0; i<bs*bs; i++) vals[i] = 2.0;
 38:     for (i=0; i<n*bs; i+=bs) {
 39:       for (j=0; j<bs; j++) {rows[j] = i+j; cols[j] = i+j;}
 40:       MatSetValues(seqmat,bs,rows,bs,cols,vals,INSERT_VALUES);
 41:     }
 42:     /* off-diagonal blocks */
 43:     for (i=0; i<bs*bs; i++) vals[i] = -1.0;
 44:     for (i=0; i<(n-1)*bs; i+=bs) {
 45:       for (j=0; j<bs; j++) {rows[j] = i+j; cols[j] = i+bs+j;}
 46:       MatSetValues(seqmat,bs,rows,bs,cols,vals,INSERT_VALUES);
 47:     }

 49:     PetscFree3(vals,rows,cols);
 50:   }
 51:   MatAssemblyBegin(seqmat,MAT_FINAL_ASSEMBLY);
 52:   MatAssemblyEnd(seqmat,MAT_FINAL_ASSEMBLY);
 53:   if (rank == 0) {
 54:     PetscPrintf(PETSC_COMM_SELF,"[%d] seqmat:\n",rank);
 55:     MatView(seqmat,PETSC_VIEWER_STDOUT_SELF);
 56:   }

 58:   MatCreateMPIMatConcatenateSeqMat(PETSC_COMM_WORLD,seqmat,PETSC_DECIDE,MAT_INITIAL_MATRIX,&mpimat);
 59:   MatCreateMPIMatConcatenateSeqMat(PETSC_COMM_WORLD,seqmat,PETSC_DECIDE,MAT_REUSE_MATRIX,&mpimat);
 60:   MatView(mpimat,PETSC_VIEWER_STDOUT_WORLD);

 62:   MatDestroy(&seqmat);
 63:   MatDestroy(&mpimat);
 64:   PetscFinalize();
 65:   return 0;
 66: }

 68: /*TEST

 70:    test:
 71:       nsize: 3

 73:    test:
 74:       suffix: 2
 75:       nsize: 3
 76:       args: -mat_type baij

 78:    test:
 79:       suffix: 3
 80:       nsize: 3
 81:       args: -mat_type baij -bs 2

 83: TEST*/