Actual source code: iscomp.c
2: #include <petsc/private/isimpl.h>
3: #include <petscviewer.h>
5: /*@
6: ISEqual - Compares if two index sets have the same set of indices.
8: Collective on IS
10: Input Parameters:
11: . is1, is2 - The index sets being compared
13: Output Parameters:
14: . flg - output flag, either PETSC_TRUE (if both index sets have the
15: same indices), or PETSC_FALSE if the index sets differ by size
16: or by the set of indices)
18: Level: intermediate
20: Note:
21: Unlike ISEqualUnsorted(), this routine sorts the contents of the index sets before
22: the comparison is made, so the order of the indices on a processor is immaterial.
24: Each processor has to have the same indices in the two sets, for example,
25: $ Processor
26: $ 0 1
27: $ is1 = {0, 1} {2, 3}
28: $ is2 = {2, 3} {0, 1}
29: will return false.
31: .seealso: ISEqualUnsorted()
32: @*/
33: PetscErrorCode ISEqual(IS is1,IS is2,PetscBool *flg)
34: {
35: PetscInt sz1,sz2,*a1,*a2;
36: const PetscInt *ptr1,*ptr2;
37: PetscBool flag;
38: MPI_Comm comm;
39: PetscMPIInt mflg;
45: if (is1 == is2) {
46: *flg = PETSC_TRUE;
47: return 0;
48: }
50: MPI_Comm_compare(PetscObjectComm((PetscObject)is1),PetscObjectComm((PetscObject)is2),&mflg);
51: if (mflg != MPI_CONGRUENT && mflg != MPI_IDENT) {
52: *flg = PETSC_FALSE;
53: return 0;
54: }
56: ISGetSize(is1,&sz1);
57: ISGetSize(is2,&sz2);
58: if (sz1 != sz2) *flg = PETSC_FALSE;
59: else {
60: ISGetLocalSize(is1,&sz1);
61: ISGetLocalSize(is2,&sz2);
63: if (sz1 != sz2) flag = PETSC_FALSE;
64: else {
65: ISGetIndices(is1,&ptr1);
66: ISGetIndices(is2,&ptr2);
68: PetscMalloc1(sz1,&a1);
69: PetscMalloc1(sz2,&a2);
71: PetscArraycpy(a1,ptr1,sz1);
72: PetscArraycpy(a2,ptr2,sz2);
74: PetscIntSortSemiOrdered(sz1,a1);
75: PetscIntSortSemiOrdered(sz2,a2);
76: PetscArraycmp(a1,a2,sz1,&flag);
78: ISRestoreIndices(is1,&ptr1);
79: ISRestoreIndices(is2,&ptr2);
81: PetscFree(a1);
82: PetscFree(a2);
83: }
84: PetscObjectGetComm((PetscObject)is1,&comm);
85: MPIU_Allreduce(&flag,flg,1,MPIU_BOOL,MPI_MIN,comm);
86: }
87: return 0;
88: }
90: /*@
91: ISEqualUnsorted - Compares if two index sets have the same indices.
93: Collective on IS
95: Input Parameters:
96: . is1, is2 - The index sets being compared
98: Output Parameters:
99: . flg - output flag, either PETSC_TRUE (if both index sets have the
100: same indices), or PETSC_FALSE if the index sets differ by size
101: or by the set of indices)
103: Level: intermediate
105: Note:
106: Unlike ISEqual(), this routine does NOT sort the contents of the index sets before
107: the comparison is made, i.e., the order of indices is important.
109: .seealso: ISEqual()
110: @*/
111: PetscErrorCode ISEqualUnsorted(IS is1,IS is2,PetscBool *flg)
112: {
113: PetscInt sz1,sz2;
114: const PetscInt *ptr1,*ptr2;
115: PetscBool flag;
116: MPI_Comm comm;
117: PetscMPIInt mflg;
123: if (is1 == is2) {
124: *flg = PETSC_TRUE;
125: return 0;
126: }
128: MPI_Comm_compare(PetscObjectComm((PetscObject)is1),PetscObjectComm((PetscObject)is2),&mflg);
129: if (mflg != MPI_CONGRUENT && mflg != MPI_IDENT) {
130: *flg = PETSC_FALSE;
131: return 0;
132: }
134: ISGetSize(is1,&sz1);
135: ISGetSize(is2,&sz2);
136: if (sz1 != sz2) *flg = PETSC_FALSE;
137: else {
138: ISGetLocalSize(is1,&sz1);
139: ISGetLocalSize(is2,&sz2);
141: if (sz1 != sz2) flag = PETSC_FALSE;
142: else {
143: ISGetIndices(is1,&ptr1);
144: ISGetIndices(is2,&ptr2);
146: PetscArraycmp(ptr1,ptr2,sz1,&flag);
148: ISRestoreIndices(is1,&ptr1);
149: ISRestoreIndices(is2,&ptr2);
150: }
151: PetscObjectGetComm((PetscObject)is1,&comm);
152: MPIU_Allreduce(&flag,flg,1,MPIU_BOOL,MPI_MIN,comm);
153: }
154: return 0;
155: }