Actual source code: ex29.c

petsc-3.12.1 2019-10-22
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  2: static char help[] = "Tests VecSetValues() and VecSetValuesBlocked() on MPI vectors.\n\
  3: Where at least a couple of mallocs will occur in the stash code.\n\n";

  5:  #include <petscvec.h>

  7: int main(int argc,char **argv)
  8: {
 10:   PetscMPIInt    size;
 11:   PetscInt       i,j,r,n = 50,repeat = 1,bs;
 12:   PetscScalar    val,*vals,zero=0.0;
 13:   PetscBool      inv = PETSC_FALSE, subset = PETSC_FALSE,flg;
 14:   Vec            x,y;

 16:   PetscInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr;
 17:   MPI_Comm_size(PETSC_COMM_WORLD,&size);
 18:   bs   = size;

 20:   PetscOptionsGetInt(NULL,NULL,"-repeat",&repeat,NULL);
 21:   PetscOptionsGetBool(NULL,NULL,"-subset",&subset,NULL);
 22:   PetscOptionsGetBool(NULL,NULL,"-invert",&inv,NULL);
 23:   PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL);
 24:   PetscOptionsGetInt(NULL,NULL,"-bs",&bs,NULL);
 25:   VecCreate(PETSC_COMM_WORLD,&x);
 26:   VecSetSizes(x,PETSC_DECIDE,n*bs);
 27:   VecSetBlockSize(x,bs);
 28:   VecSetFromOptions(x);
 29:   VecDuplicate(x,&y);

 31:   if (subset) {VecSetOption(x,VEC_SUBSET_OFF_PROC_ENTRIES,PETSC_TRUE);}

 33:   for (r=0; r<repeat; r++) {
 34:     /* Assemble the full vector on the first and last iteration, otherwise don't set any values */
 35:     for (i=0; i<n*bs*(!r || !(repeat-1-r)); i++) {
 36:       val  = i*1.0;
 37:       VecSetValues(x,1,&i,&val,INSERT_VALUES);
 38:     }
 39:     VecAssemblyBegin(x);
 40:     VecAssemblyEnd(x);
 41:     if (!r) {VecCopy(x,y);} /* Save result of first assembly */
 42:   }

 44:   VecView(x,PETSC_VIEWER_STDOUT_WORLD);
 45:   VecEqual(x,y,&flg);
 46:   if (!flg) {PetscPrintf(PETSC_COMM_WORLD,"Vectors from repeat assembly do not match.");}

 48:   /* Create a new vector because the old stash is a subset. */
 49:   VecDestroy(&x);
 50:   VecDuplicate(y,&x);
 51:   if (subset) {VecSetOption(x,VEC_SUBSET_OFF_PROC_ENTRIES,PETSC_TRUE);}

 53:   /* Now do the blocksetvalues */
 54:   VecSet(x,zero);
 55:   PetscMalloc1(bs,&vals);
 56:   for (r=0; r<repeat; r++) {
 57:     PetscInt up = n*(!r || !(repeat-1-r));
 58:     /* Assemble the full vector on the first and last iteration, otherwise don't set any values */
 59:     for (i=0; i<up; i++) {
 60:       PetscInt ii = inv ? up - i - 1 : i;
 61:       for (j=0; j<bs; j++) vals[j] = (ii*bs+j)*1.0;
 62:       VecSetValuesBlocked(x,1,&ii,vals,INSERT_VALUES);
 63:     }
 64:     VecAssemblyBegin(x);
 65:     VecAssemblyEnd(x);
 66:     if (!r) {VecCopy(x,y);} /* Save result of first assembly */
 67:   }

 69:   VecView(x,PETSC_VIEWER_STDOUT_WORLD);
 70:   VecEqual(x,y,&flg);
 71:   if (!flg) {PetscPrintf(PETSC_COMM_WORLD,"Vectors from repeat block assembly do not match.");}

 73:   VecDestroy(&x);
 74:   VecDestroy(&y);
 75:   PetscFree(vals);
 76:   PetscFinalize();
 77:   return ierr;
 78: }



 82: /*TEST

 84:    test:
 85:       nsize: 3
 86:       args: -n 126

 88:    test:
 89:       suffix: bts_test_inv_error
 90:       nsize: 3
 91:       args: -n 4 -invert -bs 2
 92:       output_file: output/ex29_test_inv_error.out

 94:    test:
 95:       suffix: bts
 96:       nsize: 3
 97:       args: -n 126 -vec_assembly_legacy
 98:       output_file: output/ex29_1.out

100:    test:
101:       suffix: bts_2
102:       nsize: 3
103:       args: -n 126 -vec_assembly_legacy -repeat 2
104:       output_file: output/ex29_1.out

106:    test:
107:       suffix: bts_2_subset
108:       nsize: 3
109:       args: -n 126 -vec_assembly_legacy -repeat 2 -subset
110:       output_file: output/ex29_1.out

112:    test:
113:       suffix: bts_2_subset_proper
114:       nsize: 3
115:       args: -n 126 -vec_assembly_legacy -repeat 5 -subset
116:       output_file: output/ex29_1.out

118: TEST*/