Actual source code: isltog.c
petsc-3.10.5 2019-03-28
2: #include <petsc/private/isimpl.h>
3: #include <petsc/private/hashmapi.h>
4: #include <petscsf.h>
5: #include <petscviewer.h>
7: PetscClassId IS_LTOGM_CLASSID;
8: static PetscErrorCode ISLocalToGlobalMappingGetBlockInfo_Private(ISLocalToGlobalMapping,PetscInt*,PetscInt**,PetscInt**,PetscInt***);
10: typedef struct {
11: PetscInt *globals;
12: } ISLocalToGlobalMapping_Basic;
14: typedef struct {
15: PetscHMapI globalht;
16: } ISLocalToGlobalMapping_Hash;
19: PetscErrorCode ISGetPointRange(IS pointIS, PetscInt *pStart, PetscInt *pEnd, const PetscInt **points)
20: {
21: PetscInt numCells, step = 1;
22: PetscBool isStride;
26: *pStart = 0;
27: *points = NULL;
28: ISGetLocalSize(pointIS, &numCells);
29: PetscObjectTypeCompare((PetscObject) pointIS, ISSTRIDE, &isStride);
30: if (isStride) {ISStrideGetInfo(pointIS, pStart, &step);}
31: *pEnd = *pStart + numCells;
32: if (!isStride || step != 1) {ISGetIndices(pointIS, points);}
33: return(0);
34: }
36: PetscErrorCode ISRestorePointRange(IS pointIS, PetscInt *pStart, PetscInt *pEnd, const PetscInt **points)
37: {
38: PetscInt step = 1;
39: PetscBool isStride;
43: PetscObjectTypeCompare((PetscObject) pointIS, ISSTRIDE, &isStride);
44: if (isStride) {ISStrideGetInfo(pointIS, pStart, &step);}
45: if (!isStride || step != 1) {ISGetIndices(pointIS, points);}
46: return(0);
47: }
49: PetscErrorCode ISGetPointSubrange(IS subpointIS, PetscInt pStart, PetscInt pEnd, const PetscInt *points)
50: {
54: if (points) {
55: ISSetType(subpointIS, ISGENERAL);
56: ISGeneralSetIndices(subpointIS, pEnd-pStart, &points[pStart], PETSC_USE_POINTER);
57: } else {
58: ISSetType(subpointIS, ISSTRIDE);
59: ISStrideSetStride(subpointIS, pEnd-pStart, pStart, 1);
60: }
61: return(0);
62: }
64: /* -----------------------------------------------------------------------------------------*/
66: /*
67: Creates the global mapping information in the ISLocalToGlobalMapping structure
69: If the user has not selected how to handle the global to local mapping then use HASH for "large" problems
70: */
71: static PetscErrorCode ISGlobalToLocalMappingSetUp(ISLocalToGlobalMapping mapping)
72: {
73: PetscInt i,*idx = mapping->indices,n = mapping->n,end,start;
77: if (mapping->data) return(0);
78: end = 0;
79: start = PETSC_MAX_INT;
81: for (i=0; i<n; i++) {
82: if (idx[i] < 0) continue;
83: if (idx[i] < start) start = idx[i];
84: if (idx[i] > end) end = idx[i];
85: }
86: if (start > end) {start = 0; end = -1;}
87: mapping->globalstart = start;
88: mapping->globalend = end;
89: if (!((PetscObject)mapping)->type_name) {
90: if ((end - start) > PetscMax(4*n,1000000)) {
91: ISLocalToGlobalMappingSetType(mapping,ISLOCALTOGLOBALMAPPINGHASH);
92: } else {
93: ISLocalToGlobalMappingSetType(mapping,ISLOCALTOGLOBALMAPPINGBASIC);
94: }
95: }
96: (*mapping->ops->globaltolocalmappingsetup)(mapping);
97: return(0);
98: }
100: static PetscErrorCode ISGlobalToLocalMappingSetUp_Basic(ISLocalToGlobalMapping mapping)
101: {
102: PetscErrorCode ierr;
103: PetscInt i,*idx = mapping->indices,n = mapping->n,end,start,*globals;
104: ISLocalToGlobalMapping_Basic *map;
107: start = mapping->globalstart;
108: end = mapping->globalend;
109: PetscNew(&map);
110: PetscMalloc1(end-start+2,&globals);
111: map->globals = globals;
112: for (i=0; i<end-start+1; i++) globals[i] = -1;
113: for (i=0; i<n; i++) {
114: if (idx[i] < 0) continue;
115: globals[idx[i] - start] = i;
116: }
117: mapping->data = (void*)map;
118: PetscLogObjectMemory((PetscObject)mapping,(end-start+1)*sizeof(PetscInt));
119: return(0);
120: }
122: static PetscErrorCode ISGlobalToLocalMappingSetUp_Hash(ISLocalToGlobalMapping mapping)
123: {
124: PetscErrorCode ierr;
125: PetscInt i,*idx = mapping->indices,n = mapping->n;
126: ISLocalToGlobalMapping_Hash *map;
129: PetscNew(&map);
130: PetscHMapICreate(&map->globalht);
131: for (i=0; i<n; i++ ) {
132: if (idx[i] < 0) continue;
133: PetscHMapISet(map->globalht,idx[i],i);
134: }
135: mapping->data = (void*)map;
136: PetscLogObjectMemory((PetscObject)mapping,2*n*sizeof(PetscInt));
137: return(0);
138: }
140: static PetscErrorCode ISLocalToGlobalMappingDestroy_Basic(ISLocalToGlobalMapping mapping)
141: {
142: PetscErrorCode ierr;
143: ISLocalToGlobalMapping_Basic *map = (ISLocalToGlobalMapping_Basic *)mapping->data;
146: if (!map) return(0);
147: PetscFree(map->globals);
148: PetscFree(mapping->data);
149: return(0);
150: }
152: static PetscErrorCode ISLocalToGlobalMappingDestroy_Hash(ISLocalToGlobalMapping mapping)
153: {
154: PetscErrorCode ierr;
155: ISLocalToGlobalMapping_Hash *map = (ISLocalToGlobalMapping_Hash*)mapping->data;
158: if (!map) return(0);
159: PetscHMapIDestroy(&map->globalht);
160: PetscFree(mapping->data);
161: return(0);
162: }
164: #define GTOLTYPE _Basic
165: #define GTOLNAME _Basic
166: #define GTOLBS mapping->bs
167: #define GTOL(g, local) do { \
168: local = map->globals[g/bs - start]; \
169: local = bs*local + (g % bs); \
170: } while (0)
172: #include <../src/vec/is/utils/isltog.h>
174: #define GTOLTYPE _Basic
175: #define GTOLNAME Block_Basic
176: #define GTOLBS 1
177: #define GTOL(g, local) do { \
178: local = map->globals[g - start]; \
179: } while (0)
180: #include <../src/vec/is/utils/isltog.h>
182: #define GTOLTYPE _Hash
183: #define GTOLNAME _Hash
184: #define GTOLBS mapping->bs
185: #define GTOL(g, local) do { \
186: (void)PetscHMapIGet(map->globalht,g/bs,&local); \
187: local = bs*local + (g % bs); \
188: } while (0)
189: #include <../src/vec/is/utils/isltog.h>
191: #define GTOLTYPE _Hash
192: #define GTOLNAME Block_Hash
193: #define GTOLBS 1
194: #define GTOL(g, local) do { \
195: (void)PetscHMapIGet(map->globalht,g,&local); \
196: } while (0)
197: #include <../src/vec/is/utils/isltog.h>
199: /*@
200: ISLocalToGlobalMappingDuplicate - Duplicates the local to global mapping object
202: Not Collective
204: Input Parameter:
205: . ltog - local to global mapping
207: Output Parameter:
208: . nltog - the duplicated local to global mapping
210: Level: advanced
212: Concepts: mapping^local to global
214: .seealso: ISLocalToGlobalMappingDestroy(), ISLocalToGlobalMappingCreate()
215: @*/
216: PetscErrorCode ISLocalToGlobalMappingDuplicate(ISLocalToGlobalMapping ltog,ISLocalToGlobalMapping* nltog)
217: {
222: ISLocalToGlobalMappingCreate(PetscObjectComm((PetscObject)ltog),ltog->bs,ltog->n,ltog->indices,PETSC_COPY_VALUES,nltog);
223: return(0);
224: }
226: /*@
227: ISLocalToGlobalMappingGetSize - Gets the local size of a local to global mapping
229: Not Collective
231: Input Parameter:
232: . ltog - local to global mapping
234: Output Parameter:
235: . n - the number of entries in the local mapping, ISLocalToGlobalMappingGetIndices() returns an array of this length
237: Level: advanced
239: Concepts: mapping^local to global
241: .seealso: ISLocalToGlobalMappingDestroy(), ISLocalToGlobalMappingCreate()
242: @*/
243: PetscErrorCode ISLocalToGlobalMappingGetSize(ISLocalToGlobalMapping mapping,PetscInt *n)
244: {
248: *n = mapping->bs*mapping->n;
249: return(0);
250: }
252: /*@C
253: ISLocalToGlobalMappingView - View a local to global mapping
255: Not Collective
257: Input Parameters:
258: + ltog - local to global mapping
259: - viewer - viewer
261: Level: advanced
263: Concepts: mapping^local to global
265: .seealso: ISLocalToGlobalMappingDestroy(), ISLocalToGlobalMappingCreate()
266: @*/
267: PetscErrorCode ISLocalToGlobalMappingView(ISLocalToGlobalMapping mapping,PetscViewer viewer)
268: {
269: PetscInt i;
270: PetscMPIInt rank;
271: PetscBool iascii;
276: if (!viewer) {
277: PetscViewerASCIIGetStdout(PetscObjectComm((PetscObject)mapping),&viewer);
278: }
281: MPI_Comm_rank(PetscObjectComm((PetscObject)mapping),&rank);
282: PetscObjectTypeCompare((PetscObject)viewer,PETSCVIEWERASCII,&iascii);
283: if (iascii) {
284: PetscObjectPrintClassNamePrefixType((PetscObject)mapping,viewer);
285: PetscViewerASCIIPushSynchronized(viewer);
286: for (i=0; i<mapping->n; i++) {
287: PetscViewerASCIISynchronizedPrintf(viewer,"[%d] %D %D\n",rank,i,mapping->indices[i]);
288: }
289: PetscViewerFlush(viewer);
290: PetscViewerASCIIPopSynchronized(viewer);
291: }
292: return(0);
293: }
295: /*@
296: ISLocalToGlobalMappingCreateIS - Creates a mapping between a local (0 to n)
297: ordering and a global parallel ordering.
299: Not collective
301: Input Parameter:
302: . is - index set containing the global numbers for each local number
304: Output Parameter:
305: . mapping - new mapping data structure
307: Notes:
308: the block size of the IS determines the block size of the mapping
309: Level: advanced
311: Concepts: mapping^local to global
313: .seealso: ISLocalToGlobalMappingDestroy(), ISLocalToGlobalMappingCreate(), ISLocalToGlobalMappingSetFromOptions()
314: @*/
315: PetscErrorCode ISLocalToGlobalMappingCreateIS(IS is,ISLocalToGlobalMapping *mapping)
316: {
318: PetscInt n,bs;
319: const PetscInt *indices;
320: MPI_Comm comm;
321: PetscBool isblock;
327: PetscObjectGetComm((PetscObject)is,&comm);
328: ISGetLocalSize(is,&n);
329: PetscObjectTypeCompare((PetscObject)is,ISBLOCK,&isblock);
330: if (!isblock) {
331: ISGetIndices(is,&indices);
332: ISLocalToGlobalMappingCreate(comm,1,n,indices,PETSC_COPY_VALUES,mapping);
333: ISRestoreIndices(is,&indices);
334: } else {
335: ISGetBlockSize(is,&bs);
336: ISBlockGetIndices(is,&indices);
337: ISLocalToGlobalMappingCreate(comm,bs,n/bs,indices,PETSC_COPY_VALUES,mapping);
338: ISBlockRestoreIndices(is,&indices);
339: }
340: return(0);
341: }
343: /*@C
344: ISLocalToGlobalMappingCreateSF - Creates a mapping between a local (0 to n)
345: ordering and a global parallel ordering.
347: Collective
349: Input Parameter:
350: + sf - star forest mapping contiguous local indices to (rank, offset)
351: - start - first global index on this process
353: Output Parameter:
354: . mapping - new mapping data structure
356: Level: advanced
358: Concepts: mapping^local to global
360: .seealso: ISLocalToGlobalMappingDestroy(), ISLocalToGlobalMappingCreate(), ISLocalToGlobalMappingCreateIS(), ISLocalToGlobalMappingSetFromOptions()
361: @*/
362: PetscErrorCode ISLocalToGlobalMappingCreateSF(PetscSF sf,PetscInt start,ISLocalToGlobalMapping *mapping)
363: {
365: PetscInt i,maxlocal,nroots,nleaves,*globals,*ltog;
366: const PetscInt *ilocal;
367: MPI_Comm comm;
373: PetscObjectGetComm((PetscObject)sf,&comm);
374: PetscSFGetGraph(sf,&nroots,&nleaves,&ilocal,NULL);
375: if (ilocal) {
376: for (i=0,maxlocal=0; i<nleaves; i++) maxlocal = PetscMax(maxlocal,ilocal[i]+1);
377: }
378: else maxlocal = nleaves;
379: PetscMalloc1(nroots,&globals);
380: PetscMalloc1(maxlocal,<og);
381: for (i=0; i<nroots; i++) globals[i] = start + i;
382: for (i=0; i<maxlocal; i++) ltog[i] = -1;
383: PetscSFBcastBegin(sf,MPIU_INT,globals,ltog);
384: PetscSFBcastEnd(sf,MPIU_INT,globals,ltog);
385: ISLocalToGlobalMappingCreate(comm,1,maxlocal,ltog,PETSC_OWN_POINTER,mapping);
386: PetscFree(globals);
387: return(0);
388: }
390: /*@
391: ISLocalToGlobalMappingSetBlockSize - Sets the blocksize of the mapping
393: Not collective
395: Input Parameters:
396: . mapping - mapping data structure
397: . bs - the blocksize
399: Level: advanced
401: Concepts: mapping^local to global
403: .seealso: ISLocalToGlobalMappingDestroy(), ISLocalToGlobalMappingCreateIS()
404: @*/
405: PetscErrorCode ISLocalToGlobalMappingSetBlockSize(ISLocalToGlobalMapping mapping,PetscInt bs)
406: {
407: PetscInt *nid;
408: const PetscInt *oid;
409: PetscInt i,cn,on,obs,nn;
414: if (bs < 1) SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_ARG_WRONG,"Invalid block size %D",bs);
415: if (bs == mapping->bs) return(0);
416: on = mapping->n;
417: obs = mapping->bs;
418: oid = mapping->indices;
419: nn = (on*obs)/bs;
420: if ((on*obs)%bs) SETERRQ3(PETSC_COMM_SELF,PETSC_ERR_ARG_WRONG,"Block size %D is inconsistent with block size %D and number of block indices %D",bs,obs,on);
422: PetscMalloc1(nn,&nid);
423: ISLocalToGlobalMappingGetIndices(mapping,&oid);
424: for (i=0;i<nn;i++) {
425: PetscInt j;
426: for (j=0,cn=0;j<bs-1;j++) {
427: if (oid[i*bs+j] < 0) { cn++; continue; }
428: if (oid[i*bs+j] != oid[i*bs+j+1]-1) SETERRQ4(PETSC_COMM_SELF,PETSC_ERR_ARG_WRONG,"Block sizes %D and %D are incompatible with the block indices: non consecutive indices %D %D",bs,obs,oid[i*bs+j],oid[i*bs+j+1]);
429: }
430: if (oid[i*bs+j] < 0) cn++;
431: if (cn) {
432: if (cn != bs) SETERRQ3(PETSC_COMM_SELF,PETSC_ERR_ARG_WRONG,"Block sizes %D and %D are incompatible with the block indices: invalid number of negative entries in block %D",bs,obs,cn);
433: nid[i] = -1;
434: } else {
435: nid[i] = oid[i*bs]/bs;
436: }
437: }
438: ISLocalToGlobalMappingRestoreIndices(mapping,&oid);
440: mapping->n = nn;
441: mapping->bs = bs;
442: PetscFree(mapping->indices);
443: mapping->indices = nid;
444: mapping->globalstart = 0;
445: mapping->globalend = 0;
447: /* reset the cached information */
448: PetscFree(mapping->info_procs);
449: PetscFree(mapping->info_numprocs);
450: if (mapping->info_indices) {
451: PetscInt i;
453: PetscFree((mapping->info_indices)[0]);
454: for (i=1; i<mapping->info_nproc; i++) {
455: PetscFree(mapping->info_indices[i]);
456: }
457: PetscFree(mapping->info_indices);
458: }
459: mapping->info_cached = PETSC_FALSE;
461: if (mapping->ops->destroy) {
462: (*mapping->ops->destroy)(mapping);
463: }
464: return(0);
465: }
467: /*@
468: ISLocalToGlobalMappingGetBlockSize - Gets the blocksize of the mapping
469: ordering and a global parallel ordering.
471: Not Collective
473: Input Parameters:
474: . mapping - mapping data structure
476: Output Parameter:
477: . bs - the blocksize
479: Level: advanced
481: Concepts: mapping^local to global
483: .seealso: ISLocalToGlobalMappingDestroy(), ISLocalToGlobalMappingCreateIS()
484: @*/
485: PetscErrorCode ISLocalToGlobalMappingGetBlockSize(ISLocalToGlobalMapping mapping,PetscInt *bs)
486: {
489: *bs = mapping->bs;
490: return(0);
491: }
493: /*@
494: ISLocalToGlobalMappingCreate - Creates a mapping between a local (0 to n)
495: ordering and a global parallel ordering.
497: Not Collective, but communicator may have more than one process
499: Input Parameters:
500: + comm - MPI communicator
501: . bs - the block size
502: . n - the number of local elements divided by the block size, or equivalently the number of block indices
503: . indices - the global index for each local element, these do not need to be in increasing order (sorted), these values should not be scaled (i.e. multiplied) by the blocksize bs
504: - mode - see PetscCopyMode
506: Output Parameter:
507: . mapping - new mapping data structure
509: Notes:
510: There is one integer value in indices per block and it represents the actual indices bs*idx + j, where j=0,..,bs-1
512: For "small" problems when using ISGlobalToLocalMappingApply() and ISGlobalToLocalMappingApplyBlock(), the ISLocalToGlobalMappingType of ISLOCALTOGLOBALMAPPINGBASIC will be used;
513: this uses more memory but is faster; this approach is not scalable for extremely large mappings. For large problems ISLOCALTOGLOBALMAPPINGHASH is used, this is scalable.
514: Use ISLocalToGlobalMappingSetType() or call ISLocalToGlobalMappingSetFromOptions() with the option -islocaltoglobalmapping_type <basic,hash> to control which is used.
516: Level: advanced
518: Concepts: mapping^local to global
520: .seealso: ISLocalToGlobalMappingDestroy(), ISLocalToGlobalMappingCreateIS(), ISLocalToGlobalMappingSetFromOptions(), ISLOCALTOGLOBALMAPPINGBASIC, ISLOCALTOGLOBALMAPPINGHASH
521: ISLocalToGlobalMappingSetType(), ISLocalToGlobalMappingType
522: @*/
523: PetscErrorCode ISLocalToGlobalMappingCreate(MPI_Comm comm,PetscInt bs,PetscInt n,const PetscInt indices[],PetscCopyMode mode,ISLocalToGlobalMapping *mapping)
524: {
526: PetscInt *in;
532: *mapping = NULL;
533: ISInitializePackage();
535: PetscHeaderCreate(*mapping,IS_LTOGM_CLASSID,"ISLocalToGlobalMapping","Local to global mapping","IS",
536: comm,ISLocalToGlobalMappingDestroy,ISLocalToGlobalMappingView);
537: (*mapping)->n = n;
538: (*mapping)->bs = bs;
539: (*mapping)->info_cached = PETSC_FALSE;
540: (*mapping)->info_free = PETSC_FALSE;
541: (*mapping)->info_procs = NULL;
542: (*mapping)->info_numprocs = NULL;
543: (*mapping)->info_indices = NULL;
544: (*mapping)->info_nodec = NULL;
545: (*mapping)->info_nodei = NULL;
547: (*mapping)->ops->globaltolocalmappingapply = NULL;
548: (*mapping)->ops->globaltolocalmappingapplyblock = NULL;
549: (*mapping)->ops->destroy = NULL;
550: if (mode == PETSC_COPY_VALUES) {
551: PetscMalloc1(n,&in);
552: PetscMemcpy(in,indices,n*sizeof(PetscInt));
553: (*mapping)->indices = in;
554: PetscLogObjectMemory((PetscObject)*mapping,n*sizeof(PetscInt));
555: } else if (mode == PETSC_OWN_POINTER) {
556: (*mapping)->indices = (PetscInt*)indices;
557: PetscLogObjectMemory((PetscObject)*mapping,n*sizeof(PetscInt));
558: }
559: else SETERRQ(comm,PETSC_ERR_SUP,"Cannot currently use PETSC_USE_POINTER");
560: return(0);
561: }
563: PetscFunctionList ISLocalToGlobalMappingList = NULL;
566: /*@
567: ISLocalToGlobalMappingSetFromOptions - Set mapping options from the options database.
569: Not collective
571: Input Parameters:
572: . mapping - mapping data structure
574: Level: advanced
576: @*/
577: PetscErrorCode ISLocalToGlobalMappingSetFromOptions(ISLocalToGlobalMapping mapping)
578: {
579: PetscErrorCode ierr;
580: char type[256];
581: ISLocalToGlobalMappingType defaulttype = "Not set";
582: PetscBool flg;
586: ISLocalToGlobalMappingRegisterAll();
587: PetscObjectOptionsBegin((PetscObject)mapping);
588: PetscOptionsFList("-islocaltoglobalmapping_type","ISLocalToGlobalMapping method","ISLocalToGlobalMappingSetType",ISLocalToGlobalMappingList,(char*)(((PetscObject)mapping)->type_name) ? ((PetscObject)mapping)->type_name : defaulttype,type,256,&flg);
589: if (flg) {
590: ISLocalToGlobalMappingSetType(mapping,type);
591: }
592: PetscOptionsEnd();
593: return(0);
594: }
596: /*@
597: ISLocalToGlobalMappingDestroy - Destroys a mapping between a local (0 to n)
598: ordering and a global parallel ordering.
600: Note Collective
602: Input Parameters:
603: . mapping - mapping data structure
605: Level: advanced
607: .seealso: ISLocalToGlobalMappingCreate()
608: @*/
609: PetscErrorCode ISLocalToGlobalMappingDestroy(ISLocalToGlobalMapping *mapping)
610: {
614: if (!*mapping) return(0);
616: if (--((PetscObject)(*mapping))->refct > 0) {*mapping = 0;return(0);}
617: PetscFree((*mapping)->indices);
618: PetscFree((*mapping)->info_procs);
619: PetscFree((*mapping)->info_numprocs);
620: if ((*mapping)->info_indices) {
621: PetscInt i;
623: PetscFree(((*mapping)->info_indices)[0]);
624: for (i=1; i<(*mapping)->info_nproc; i++) {
625: PetscFree(((*mapping)->info_indices)[i]);
626: }
627: PetscFree((*mapping)->info_indices);
628: }
629: if ((*mapping)->info_nodei) {
630: PetscFree(((*mapping)->info_nodei)[0]);
631: }
632: PetscFree((*mapping)->info_nodei);
633: PetscFree((*mapping)->info_nodec);
634: if ((*mapping)->ops->destroy) {
635: (*(*mapping)->ops->destroy)(*mapping);
636: }
637: PetscHeaderDestroy(mapping);
638: *mapping = 0;
639: return(0);
640: }
642: /*@
643: ISLocalToGlobalMappingApplyIS - Creates from an IS in the local numbering
644: a new index set using the global numbering defined in an ISLocalToGlobalMapping
645: context.
647: Not collective
649: Input Parameters:
650: + mapping - mapping between local and global numbering
651: - is - index set in local numbering
653: Output Parameters:
654: . newis - index set in global numbering
656: Level: advanced
658: Concepts: mapping^local to global
660: .seealso: ISLocalToGlobalMappingApply(), ISLocalToGlobalMappingCreate(),
661: ISLocalToGlobalMappingDestroy(), ISGlobalToLocalMappingApply()
662: @*/
663: PetscErrorCode ISLocalToGlobalMappingApplyIS(ISLocalToGlobalMapping mapping,IS is,IS *newis)
664: {
666: PetscInt n,*idxout;
667: const PetscInt *idxin;
674: ISGetLocalSize(is,&n);
675: ISGetIndices(is,&idxin);
676: PetscMalloc1(n,&idxout);
677: ISLocalToGlobalMappingApply(mapping,n,idxin,idxout);
678: ISRestoreIndices(is,&idxin);
679: ISCreateGeneral(PetscObjectComm((PetscObject)is),n,idxout,PETSC_OWN_POINTER,newis);
680: return(0);
681: }
683: /*@
684: ISLocalToGlobalMappingApply - Takes a list of integers in a local numbering
685: and converts them to the global numbering.
687: Not collective
689: Input Parameters:
690: + mapping - the local to global mapping context
691: . N - number of integers
692: - in - input indices in local numbering
694: Output Parameter:
695: . out - indices in global numbering
697: Notes:
698: The in and out array parameters may be identical.
700: Level: advanced
702: .seealso: ISLocalToGlobalMappingApplyBlock(), ISLocalToGlobalMappingCreate(),ISLocalToGlobalMappingDestroy(),
703: ISLocalToGlobalMappingApplyIS(),AOCreateBasic(),AOApplicationToPetsc(),
704: AOPetscToApplication(), ISGlobalToLocalMappingApply()
706: Concepts: mapping^local to global
707: @*/
708: PetscErrorCode ISLocalToGlobalMappingApply(ISLocalToGlobalMapping mapping,PetscInt N,const PetscInt in[],PetscInt out[])
709: {
710: PetscInt i,bs,Nmax;
714: bs = mapping->bs;
715: Nmax = bs*mapping->n;
716: if (bs == 1) {
717: const PetscInt *idx = mapping->indices;
718: for (i=0; i<N; i++) {
719: if (in[i] < 0) {
720: out[i] = in[i];
721: continue;
722: }
723: if (in[i] >= Nmax) SETERRQ3(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"Local index %D too large %D (max) at %D",in[i],Nmax-1,i);
724: out[i] = idx[in[i]];
725: }
726: } else {
727: const PetscInt *idx = mapping->indices;
728: for (i=0; i<N; i++) {
729: if (in[i] < 0) {
730: out[i] = in[i];
731: continue;
732: }
733: if (in[i] >= Nmax) SETERRQ3(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"Local index %D too large %D (max) at %D",in[i],Nmax-1,i);
734: out[i] = idx[in[i]/bs]*bs + (in[i] % bs);
735: }
736: }
737: return(0);
738: }
740: /*@
741: ISLocalToGlobalMappingApplyBlock - Takes a list of integers in a local block numbering and converts them to the global block numbering
743: Not collective
745: Input Parameters:
746: + mapping - the local to global mapping context
747: . N - number of integers
748: - in - input indices in local block numbering
750: Output Parameter:
751: . out - indices in global block numbering
753: Notes:
754: The in and out array parameters may be identical.
756: Example:
757: If the index values are {0,1,6,7} set with a call to ISLocalToGlobalMappingCreate(PETSC_COMM_SELF,2,2,{0,3}) then the mapping applied to 0
758: (the first block) would produce 0 and the mapping applied to 1 (the second block) would produce 3.
760: Level: advanced
762: .seealso: ISLocalToGlobalMappingApply(), ISLocalToGlobalMappingCreate(),ISLocalToGlobalMappingDestroy(),
763: ISLocalToGlobalMappingApplyIS(),AOCreateBasic(),AOApplicationToPetsc(),
764: AOPetscToApplication(), ISGlobalToLocalMappingApply()
766: Concepts: mapping^local to global
767: @*/
768: PetscErrorCode ISLocalToGlobalMappingApplyBlock(ISLocalToGlobalMapping mapping,PetscInt N,const PetscInt in[],PetscInt out[])
769: {
773: {
774: PetscInt i,Nmax = mapping->n;
775: const PetscInt *idx = mapping->indices;
777: for (i=0; i<N; i++) {
778: if (in[i] < 0) {
779: out[i] = in[i];
780: continue;
781: }
782: if (in[i] >= Nmax) SETERRQ3(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"Local block index %D too large %D (max) at %D",in[i],Nmax-1,i);
783: out[i] = idx[in[i]];
784: }
785: }
786: return(0);
787: }
789: /*@
790: ISGlobalToLocalMappingApply - Provides the local numbering for a list of integers
791: specified with a global numbering.
793: Not collective
795: Input Parameters:
796: + mapping - mapping between local and global numbering
797: . type - IS_GTOLM_MASK - replaces global indices with no local value with -1
798: IS_GTOLM_DROP - drops the indices with no local value from the output list
799: . n - number of global indices to map
800: - idx - global indices to map
802: Output Parameters:
803: + nout - number of indices in output array (if type == IS_GTOLM_MASK then nout = n)
804: - idxout - local index of each global index, one must pass in an array long enough
805: to hold all the indices. You can call ISGlobalToLocalMappingApply() with
806: idxout == NULL to determine the required length (returned in nout)
807: and then allocate the required space and call ISGlobalToLocalMappingApply()
808: a second time to set the values.
810: Notes:
811: Either nout or idxout may be NULL. idx and idxout may be identical.
813: For "small" problems when using ISGlobalToLocalMappingApply() and ISGlobalToLocalMappingApplyBlock(), the ISLocalToGlobalMappingType of ISLOCALTOGLOBALMAPPINGBASIC will be used;
814: this uses more memory but is faster; this approach is not scalable for extremely large mappings. For large problems ISLOCALTOGLOBALMAPPINGHASH is used, this is scalable.
815: Use ISLocalToGlobalMappingSetType() or call ISLocalToGlobalMappingSetFromOptions() with the option -islocaltoglobalmapping_type <basic,hash> to control which is used.
817: Level: advanced
819: Developer Note: The manual page states that idx and idxout may be identical but the calling
820: sequence declares idx as const so it cannot be the same as idxout.
822: Concepts: mapping^global to local
824: .seealso: ISLocalToGlobalMappingApply(), ISGlobalToLocalMappingApplyBlock(), ISLocalToGlobalMappingCreate(),
825: ISLocalToGlobalMappingDestroy()
826: @*/
827: PetscErrorCode ISGlobalToLocalMappingApply(ISLocalToGlobalMapping mapping,ISGlobalToLocalMappingMode type,PetscInt n,const PetscInt idx[],PetscInt *nout,PetscInt idxout[])
828: {
833: if (!mapping->data) {
834: ISGlobalToLocalMappingSetUp(mapping);
835: }
836: (*mapping->ops->globaltolocalmappingapply)(mapping,type,n,idx,nout,idxout);
837: return(0);
838: }
840: /*@
841: ISGlobalToLocalMappingApplyIS - Creates from an IS in the global numbering
842: a new index set using the local numbering defined in an ISLocalToGlobalMapping
843: context.
845: Not collective
847: Input Parameters:
848: + mapping - mapping between local and global numbering
849: . type - IS_GTOLM_MASK - replaces global indices with no local value with -1
850: IS_GTOLM_DROP - drops the indices with no local value from the output list
851: - is - index set in global numbering
853: Output Parameters:
854: . newis - index set in local numbering
856: Level: advanced
858: Concepts: mapping^local to global
860: .seealso: ISGlobalToLocalMappingApply(), ISLocalToGlobalMappingCreate(),
861: ISLocalToGlobalMappingDestroy()
862: @*/
863: PetscErrorCode ISGlobalToLocalMappingApplyIS(ISLocalToGlobalMapping mapping,ISGlobalToLocalMappingMode type,IS is,IS *newis)
864: {
866: PetscInt n,nout,*idxout;
867: const PetscInt *idxin;
874: ISGetLocalSize(is,&n);
875: ISGetIndices(is,&idxin);
876: if (type == IS_GTOLM_MASK) {
877: PetscMalloc1(n,&idxout);
878: } else {
879: ISGlobalToLocalMappingApply(mapping,type,n,idxin,&nout,NULL);
880: PetscMalloc1(nout,&idxout);
881: }
882: ISGlobalToLocalMappingApply(mapping,type,n,idxin,&nout,idxout);
883: ISRestoreIndices(is,&idxin);
884: ISCreateGeneral(PetscObjectComm((PetscObject)is),nout,idxout,PETSC_OWN_POINTER,newis);
885: return(0);
886: }
888: /*@
889: ISGlobalToLocalMappingApplyBlock - Provides the local block numbering for a list of integers
890: specified with a block global numbering.
892: Not collective
894: Input Parameters:
895: + mapping - mapping between local and global numbering
896: . type - IS_GTOLM_MASK - replaces global indices with no local value with -1
897: IS_GTOLM_DROP - drops the indices with no local value from the output list
898: . n - number of global indices to map
899: - idx - global indices to map
901: Output Parameters:
902: + nout - number of indices in output array (if type == IS_GTOLM_MASK then nout = n)
903: - idxout - local index of each global index, one must pass in an array long enough
904: to hold all the indices. You can call ISGlobalToLocalMappingApplyBlock() with
905: idxout == NULL to determine the required length (returned in nout)
906: and then allocate the required space and call ISGlobalToLocalMappingApplyBlock()
907: a second time to set the values.
909: Notes:
910: Either nout or idxout may be NULL. idx and idxout may be identical.
912: For "small" problems when using ISGlobalToLocalMappingApply() and ISGlobalToLocalMappingApplyBlock(), the ISLocalToGlobalMappingType of ISLOCALTOGLOBALMAPPINGBASIC will be used;
913: this uses more memory but is faster; this approach is not scalable for extremely large mappings. For large problems ISLOCALTOGLOBALMAPPINGHASH is used, this is scalable.
914: Use ISLocalToGlobalMappingSetType() or call ISLocalToGlobalMappingSetFromOptions() with the option -islocaltoglobalmapping_type <basic,hash> to control which is used.
916: Level: advanced
918: Developer Note: The manual page states that idx and idxout may be identical but the calling
919: sequence declares idx as const so it cannot be the same as idxout.
921: Concepts: mapping^global to local
923: .seealso: ISLocalToGlobalMappingApply(), ISGlobalToLocalMappingApply(), ISLocalToGlobalMappingCreate(),
924: ISLocalToGlobalMappingDestroy()
925: @*/
926: PetscErrorCode ISGlobalToLocalMappingApplyBlock(ISLocalToGlobalMapping mapping,ISGlobalToLocalMappingMode type,
927: PetscInt n,const PetscInt idx[],PetscInt *nout,PetscInt idxout[])
928: {
933: if (!mapping->data) {
934: ISGlobalToLocalMappingSetUp(mapping);
935: }
936: (*mapping->ops->globaltolocalmappingapplyblock)(mapping,type,n,idx,nout,idxout);
937: return(0);
938: }
941: /*@C
942: ISLocalToGlobalMappingGetBlockInfo - Gets the neighbor information for each processor and
943: each index shared by more than one processor
945: Collective on ISLocalToGlobalMapping
947: Input Parameters:
948: . mapping - the mapping from local to global indexing
950: Output Parameter:
951: + nproc - number of processors that are connected to this one
952: . proc - neighboring processors
953: . numproc - number of indices for each subdomain (processor)
954: - indices - indices of nodes (in local numbering) shared with neighbors (sorted by global numbering)
956: Level: advanced
958: Concepts: mapping^local to global
960: Fortran Usage:
961: $ ISLocalToGlobalMpngGetInfoSize(ISLocalToGlobalMapping,PetscInt nproc,PetscInt numprocmax,ierr) followed by
962: $ ISLocalToGlobalMappingGetInfo(ISLocalToGlobalMapping,PetscInt nproc, PetscInt procs[nproc],PetscInt numprocs[nproc],
963: PetscInt indices[nproc][numprocmax],ierr)
964: There is no ISLocalToGlobalMappingRestoreInfo() in Fortran. You must make sure that procs[], numprocs[] and
965: indices[][] are large enough arrays, either by allocating them dynamically or defining static ones large enough.
968: .seealso: ISLocalToGlobalMappingDestroy(), ISLocalToGlobalMappingCreateIS(), ISLocalToGlobalMappingCreate(),
969: ISLocalToGlobalMappingRestoreInfo()
970: @*/
971: PetscErrorCode ISLocalToGlobalMappingGetBlockInfo(ISLocalToGlobalMapping mapping,PetscInt *nproc,PetscInt *procs[],PetscInt *numprocs[],PetscInt **indices[])
972: {
977: if (mapping->info_cached) {
978: *nproc = mapping->info_nproc;
979: *procs = mapping->info_procs;
980: *numprocs = mapping->info_numprocs;
981: *indices = mapping->info_indices;
982: } else {
983: ISLocalToGlobalMappingGetBlockInfo_Private(mapping,nproc,procs,numprocs,indices);
984: }
985: return(0);
986: }
988: static PetscErrorCode ISLocalToGlobalMappingGetBlockInfo_Private(ISLocalToGlobalMapping mapping,PetscInt *nproc,PetscInt *procs[],PetscInt *numprocs[],PetscInt **indices[])
989: {
991: PetscMPIInt size,rank,tag1,tag2,tag3,*len,*source,imdex;
992: PetscInt i,n = mapping->n,Ng,ng,max = 0,*lindices = mapping->indices;
993: PetscInt *nprocs,*owner,nsends,*sends,j,*starts,nmax,nrecvs,*recvs,proc;
994: PetscInt cnt,scale,*ownedsenders,*nownedsenders,rstart,nowned;
995: PetscInt node,nownedm,nt,*sends2,nsends2,*starts2,*lens2,*dest,nrecvs2,*starts3,*recvs2,k,*bprocs,*tmp;
996: PetscInt first_procs,first_numprocs,*first_indices;
997: MPI_Request *recv_waits,*send_waits;
998: MPI_Status recv_status,*send_status,*recv_statuses;
999: MPI_Comm comm;
1000: PetscBool debug = PETSC_FALSE;
1003: PetscObjectGetComm((PetscObject)mapping,&comm);
1004: MPI_Comm_size(comm,&size);
1005: MPI_Comm_rank(comm,&rank);
1006: if (size == 1) {
1007: *nproc = 0;
1008: *procs = NULL;
1009: PetscNew(numprocs);
1010: (*numprocs)[0] = 0;
1011: PetscNew(indices);
1012: (*indices)[0] = NULL;
1013: /* save info for reuse */
1014: mapping->info_nproc = *nproc;
1015: mapping->info_procs = *procs;
1016: mapping->info_numprocs = *numprocs;
1017: mapping->info_indices = *indices;
1018: mapping->info_cached = PETSC_TRUE;
1019: return(0);
1020: }
1022: PetscOptionsGetBool(((PetscObject)mapping)->options,NULL,"-islocaltoglobalmappinggetinfo_debug",&debug,NULL);
1024: /*
1025: Notes on ISLocalToGlobalMappingGetBlockInfo
1027: globally owned node - the nodes that have been assigned to this processor in global
1028: numbering, just for this routine.
1030: nontrivial globally owned node - node assigned to this processor that is on a subdomain
1031: boundary (i.e. is has more than one local owner)
1033: locally owned node - node that exists on this processors subdomain
1035: nontrivial locally owned node - node that is not in the interior (i.e. has more than one
1036: local subdomain
1037: */
1038: PetscObjectGetNewTag((PetscObject)mapping,&tag1);
1039: PetscObjectGetNewTag((PetscObject)mapping,&tag2);
1040: PetscObjectGetNewTag((PetscObject)mapping,&tag3);
1042: for (i=0; i<n; i++) {
1043: if (lindices[i] > max) max = lindices[i];
1044: }
1045: MPIU_Allreduce(&max,&Ng,1,MPIU_INT,MPI_MAX,comm);
1046: Ng++;
1047: MPI_Comm_size(comm,&size);
1048: MPI_Comm_rank(comm,&rank);
1049: scale = Ng/size + 1;
1050: ng = scale; if (rank == size-1) ng = Ng - scale*(size-1); ng = PetscMax(1,ng);
1051: rstart = scale*rank;
1053: /* determine ownership ranges of global indices */
1054: PetscMalloc1(2*size,&nprocs);
1055: PetscMemzero(nprocs,2*size*sizeof(PetscInt));
1057: /* determine owners of each local node */
1058: PetscMalloc1(n,&owner);
1059: for (i=0; i<n; i++) {
1060: proc = lindices[i]/scale; /* processor that globally owns this index */
1061: nprocs[2*proc+1] = 1; /* processor globally owns at least one of ours */
1062: owner[i] = proc;
1063: nprocs[2*proc]++; /* count of how many that processor globally owns of ours */
1064: }
1065: nsends = 0; for (i=0; i<size; i++) nsends += nprocs[2*i+1];
1066: PetscInfo1(mapping,"Number of global owners for my local data %D\n",nsends);
1068: /* inform other processors of number of messages and max length*/
1069: PetscMaxSum(comm,nprocs,&nmax,&nrecvs);
1070: PetscInfo1(mapping,"Number of local owners for my global data %D\n",nrecvs);
1072: /* post receives for owned rows */
1073: PetscMalloc1((2*nrecvs+1)*(nmax+1),&recvs);
1074: PetscMalloc1(nrecvs+1,&recv_waits);
1075: for (i=0; i<nrecvs; i++) {
1076: MPI_Irecv(recvs+2*nmax*i,2*nmax,MPIU_INT,MPI_ANY_SOURCE,tag1,comm,recv_waits+i);
1077: }
1079: /* pack messages containing lists of local nodes to owners */
1080: PetscMalloc1(2*n+1,&sends);
1081: PetscMalloc1(size+1,&starts);
1082: starts[0] = 0;
1083: for (i=1; i<size; i++) starts[i] = starts[i-1] + 2*nprocs[2*i-2];
1084: for (i=0; i<n; i++) {
1085: sends[starts[owner[i]]++] = lindices[i];
1086: sends[starts[owner[i]]++] = i;
1087: }
1088: PetscFree(owner);
1089: starts[0] = 0;
1090: for (i=1; i<size; i++) starts[i] = starts[i-1] + 2*nprocs[2*i-2];
1092: /* send the messages */
1093: PetscMalloc1(nsends+1,&send_waits);
1094: PetscMalloc1(nsends+1,&dest);
1095: cnt = 0;
1096: for (i=0; i<size; i++) {
1097: if (nprocs[2*i]) {
1098: MPI_Isend(sends+starts[i],2*nprocs[2*i],MPIU_INT,i,tag1,comm,send_waits+cnt);
1099: dest[cnt] = i;
1100: cnt++;
1101: }
1102: }
1103: PetscFree(starts);
1105: /* wait on receives */
1106: PetscMalloc1(nrecvs+1,&source);
1107: PetscMalloc1(nrecvs+1,&len);
1108: cnt = nrecvs;
1109: PetscMalloc1(ng+1,&nownedsenders);
1110: PetscMemzero(nownedsenders,ng*sizeof(PetscInt));
1111: while (cnt) {
1112: MPI_Waitany(nrecvs,recv_waits,&imdex,&recv_status);
1113: /* unpack receives into our local space */
1114: MPI_Get_count(&recv_status,MPIU_INT,&len[imdex]);
1115: source[imdex] = recv_status.MPI_SOURCE;
1116: len[imdex] = len[imdex]/2;
1117: /* count how many local owners for each of my global owned indices */
1118: for (i=0; i<len[imdex]; i++) nownedsenders[recvs[2*imdex*nmax+2*i]-rstart]++;
1119: cnt--;
1120: }
1121: PetscFree(recv_waits);
1123: /* count how many globally owned indices are on an edge multiplied by how many processors own them. */
1124: nowned = 0;
1125: nownedm = 0;
1126: for (i=0; i<ng; i++) {
1127: if (nownedsenders[i] > 1) {nownedm += nownedsenders[i]; nowned++;}
1128: }
1130: /* create single array to contain rank of all local owners of each globally owned index */
1131: PetscMalloc1(nownedm+1,&ownedsenders);
1132: PetscMalloc1(ng+1,&starts);
1133: starts[0] = 0;
1134: for (i=1; i<ng; i++) {
1135: if (nownedsenders[i-1] > 1) starts[i] = starts[i-1] + nownedsenders[i-1];
1136: else starts[i] = starts[i-1];
1137: }
1139: /* for each nontrival globally owned node list all arriving processors */
1140: for (i=0; i<nrecvs; i++) {
1141: for (j=0; j<len[i]; j++) {
1142: node = recvs[2*i*nmax+2*j]-rstart;
1143: if (nownedsenders[node] > 1) ownedsenders[starts[node]++] = source[i];
1144: }
1145: }
1147: if (debug) { /* ----------------------------------- */
1148: starts[0] = 0;
1149: for (i=1; i<ng; i++) {
1150: if (nownedsenders[i-1] > 1) starts[i] = starts[i-1] + nownedsenders[i-1];
1151: else starts[i] = starts[i-1];
1152: }
1153: for (i=0; i<ng; i++) {
1154: if (nownedsenders[i] > 1) {
1155: PetscSynchronizedPrintf(comm,"[%d] global node %D local owner processors: ",rank,i+rstart);
1156: for (j=0; j<nownedsenders[i]; j++) {
1157: PetscSynchronizedPrintf(comm,"%D ",ownedsenders[starts[i]+j]);
1158: }
1159: PetscSynchronizedPrintf(comm,"\n");
1160: }
1161: }
1162: PetscSynchronizedFlush(comm,PETSC_STDOUT);
1163: } /* ----------------------------------- */
1165: /* wait on original sends */
1166: if (nsends) {
1167: PetscMalloc1(nsends,&send_status);
1168: MPI_Waitall(nsends,send_waits,send_status);
1169: PetscFree(send_status);
1170: }
1171: PetscFree(send_waits);
1172: PetscFree(sends);
1173: PetscFree(nprocs);
1175: /* pack messages to send back to local owners */
1176: starts[0] = 0;
1177: for (i=1; i<ng; i++) {
1178: if (nownedsenders[i-1] > 1) starts[i] = starts[i-1] + nownedsenders[i-1];
1179: else starts[i] = starts[i-1];
1180: }
1181: nsends2 = nrecvs;
1182: PetscMalloc1(nsends2+1,&nprocs); /* length of each message */
1183: for (i=0; i<nrecvs; i++) {
1184: nprocs[i] = 1;
1185: for (j=0; j<len[i]; j++) {
1186: node = recvs[2*i*nmax+2*j]-rstart;
1187: if (nownedsenders[node] > 1) nprocs[i] += 2 + nownedsenders[node];
1188: }
1189: }
1190: nt = 0;
1191: for (i=0; i<nsends2; i++) nt += nprocs[i];
1193: PetscMalloc1(nt+1,&sends2);
1194: PetscMalloc1(nsends2+1,&starts2);
1196: starts2[0] = 0;
1197: for (i=1; i<nsends2; i++) starts2[i] = starts2[i-1] + nprocs[i-1];
1198: /*
1199: Each message is 1 + nprocs[i] long, and consists of
1200: (0) the number of nodes being sent back
1201: (1) the local node number,
1202: (2) the number of processors sharing it,
1203: (3) the processors sharing it
1204: */
1205: for (i=0; i<nsends2; i++) {
1206: cnt = 1;
1207: sends2[starts2[i]] = 0;
1208: for (j=0; j<len[i]; j++) {
1209: node = recvs[2*i*nmax+2*j]-rstart;
1210: if (nownedsenders[node] > 1) {
1211: sends2[starts2[i]]++;
1212: sends2[starts2[i]+cnt++] = recvs[2*i*nmax+2*j+1];
1213: sends2[starts2[i]+cnt++] = nownedsenders[node];
1214: PetscMemcpy(&sends2[starts2[i]+cnt],&ownedsenders[starts[node]],nownedsenders[node]*sizeof(PetscInt));
1215: cnt += nownedsenders[node];
1216: }
1217: }
1218: }
1220: /* receive the message lengths */
1221: nrecvs2 = nsends;
1222: PetscMalloc1(nrecvs2+1,&lens2);
1223: PetscMalloc1(nrecvs2+1,&starts3);
1224: PetscMalloc1(nrecvs2+1,&recv_waits);
1225: for (i=0; i<nrecvs2; i++) {
1226: MPI_Irecv(&lens2[i],1,MPIU_INT,dest[i],tag2,comm,recv_waits+i);
1227: }
1229: /* send the message lengths */
1230: for (i=0; i<nsends2; i++) {
1231: MPI_Send(&nprocs[i],1,MPIU_INT,source[i],tag2,comm);
1232: }
1234: /* wait on receives of lens */
1235: if (nrecvs2) {
1236: PetscMalloc1(nrecvs2,&recv_statuses);
1237: MPI_Waitall(nrecvs2,recv_waits,recv_statuses);
1238: PetscFree(recv_statuses);
1239: }
1240: PetscFree(recv_waits);
1242: starts3[0] = 0;
1243: nt = 0;
1244: for (i=0; i<nrecvs2-1; i++) {
1245: starts3[i+1] = starts3[i] + lens2[i];
1246: nt += lens2[i];
1247: }
1248: if (nrecvs2) nt += lens2[nrecvs2-1];
1250: PetscMalloc1(nt+1,&recvs2);
1251: PetscMalloc1(nrecvs2+1,&recv_waits);
1252: for (i=0; i<nrecvs2; i++) {
1253: MPI_Irecv(recvs2+starts3[i],lens2[i],MPIU_INT,dest[i],tag3,comm,recv_waits+i);
1254: }
1256: /* send the messages */
1257: PetscMalloc1(nsends2+1,&send_waits);
1258: for (i=0; i<nsends2; i++) {
1259: MPI_Isend(sends2+starts2[i],nprocs[i],MPIU_INT,source[i],tag3,comm,send_waits+i);
1260: }
1262: /* wait on receives */
1263: if (nrecvs2) {
1264: PetscMalloc1(nrecvs2,&recv_statuses);
1265: MPI_Waitall(nrecvs2,recv_waits,recv_statuses);
1266: PetscFree(recv_statuses);
1267: }
1268: PetscFree(recv_waits);
1269: PetscFree(nprocs);
1271: if (debug) { /* ----------------------------------- */
1272: cnt = 0;
1273: for (i=0; i<nrecvs2; i++) {
1274: nt = recvs2[cnt++];
1275: for (j=0; j<nt; j++) {
1276: PetscSynchronizedPrintf(comm,"[%d] local node %D number of subdomains %D: ",rank,recvs2[cnt],recvs2[cnt+1]);
1277: for (k=0; k<recvs2[cnt+1]; k++) {
1278: PetscSynchronizedPrintf(comm,"%D ",recvs2[cnt+2+k]);
1279: }
1280: cnt += 2 + recvs2[cnt+1];
1281: PetscSynchronizedPrintf(comm,"\n");
1282: }
1283: }
1284: PetscSynchronizedFlush(comm,PETSC_STDOUT);
1285: } /* ----------------------------------- */
1287: /* count number subdomains for each local node */
1288: PetscMalloc1(size,&nprocs);
1289: PetscMemzero(nprocs,size*sizeof(PetscInt));
1290: cnt = 0;
1291: for (i=0; i<nrecvs2; i++) {
1292: nt = recvs2[cnt++];
1293: for (j=0; j<nt; j++) {
1294: for (k=0; k<recvs2[cnt+1]; k++) nprocs[recvs2[cnt+2+k]]++;
1295: cnt += 2 + recvs2[cnt+1];
1296: }
1297: }
1298: nt = 0; for (i=0; i<size; i++) nt += (nprocs[i] > 0);
1299: *nproc = nt;
1300: PetscMalloc1(nt+1,procs);
1301: PetscMalloc1(nt+1,numprocs);
1302: PetscMalloc1(nt+1,indices);
1303: for (i=0;i<nt+1;i++) (*indices)[i]=NULL;
1304: PetscMalloc1(size,&bprocs);
1305: cnt = 0;
1306: for (i=0; i<size; i++) {
1307: if (nprocs[i] > 0) {
1308: bprocs[i] = cnt;
1309: (*procs)[cnt] = i;
1310: (*numprocs)[cnt] = nprocs[i];
1311: PetscMalloc1(nprocs[i],&(*indices)[cnt]);
1312: cnt++;
1313: }
1314: }
1316: /* make the list of subdomains for each nontrivial local node */
1317: PetscMemzero(*numprocs,nt*sizeof(PetscInt));
1318: cnt = 0;
1319: for (i=0; i<nrecvs2; i++) {
1320: nt = recvs2[cnt++];
1321: for (j=0; j<nt; j++) {
1322: for (k=0; k<recvs2[cnt+1]; k++) (*indices)[bprocs[recvs2[cnt+2+k]]][(*numprocs)[bprocs[recvs2[cnt+2+k]]]++] = recvs2[cnt];
1323: cnt += 2 + recvs2[cnt+1];
1324: }
1325: }
1326: PetscFree(bprocs);
1327: PetscFree(recvs2);
1329: /* sort the node indexing by their global numbers */
1330: nt = *nproc;
1331: for (i=0; i<nt; i++) {
1332: PetscMalloc1((*numprocs)[i],&tmp);
1333: for (j=0; j<(*numprocs)[i]; j++) tmp[j] = lindices[(*indices)[i][j]];
1334: PetscSortIntWithArray((*numprocs)[i],tmp,(*indices)[i]);
1335: PetscFree(tmp);
1336: }
1338: if (debug) { /* ----------------------------------- */
1339: nt = *nproc;
1340: for (i=0; i<nt; i++) {
1341: PetscSynchronizedPrintf(comm,"[%d] subdomain %D number of indices %D: ",rank,(*procs)[i],(*numprocs)[i]);
1342: for (j=0; j<(*numprocs)[i]; j++) {
1343: PetscSynchronizedPrintf(comm,"%D ",(*indices)[i][j]);
1344: }
1345: PetscSynchronizedPrintf(comm,"\n");
1346: }
1347: PetscSynchronizedFlush(comm,PETSC_STDOUT);
1348: } /* ----------------------------------- */
1350: /* wait on sends */
1351: if (nsends2) {
1352: PetscMalloc1(nsends2,&send_status);
1353: MPI_Waitall(nsends2,send_waits,send_status);
1354: PetscFree(send_status);
1355: }
1357: PetscFree(starts3);
1358: PetscFree(dest);
1359: PetscFree(send_waits);
1361: PetscFree(nownedsenders);
1362: PetscFree(ownedsenders);
1363: PetscFree(starts);
1364: PetscFree(starts2);
1365: PetscFree(lens2);
1367: PetscFree(source);
1368: PetscFree(len);
1369: PetscFree(recvs);
1370: PetscFree(nprocs);
1371: PetscFree(sends2);
1373: /* put the information about myself as the first entry in the list */
1374: first_procs = (*procs)[0];
1375: first_numprocs = (*numprocs)[0];
1376: first_indices = (*indices)[0];
1377: for (i=0; i<*nproc; i++) {
1378: if ((*procs)[i] == rank) {
1379: (*procs)[0] = (*procs)[i];
1380: (*numprocs)[0] = (*numprocs)[i];
1381: (*indices)[0] = (*indices)[i];
1382: (*procs)[i] = first_procs;
1383: (*numprocs)[i] = first_numprocs;
1384: (*indices)[i] = first_indices;
1385: break;
1386: }
1387: }
1389: /* save info for reuse */
1390: mapping->info_nproc = *nproc;
1391: mapping->info_procs = *procs;
1392: mapping->info_numprocs = *numprocs;
1393: mapping->info_indices = *indices;
1394: mapping->info_cached = PETSC_TRUE;
1395: return(0);
1396: }
1398: /*@C
1399: ISLocalToGlobalMappingRestoreBlockInfo - Frees the memory allocated by ISLocalToGlobalMappingGetBlockInfo()
1401: Collective on ISLocalToGlobalMapping
1403: Input Parameters:
1404: . mapping - the mapping from local to global indexing
1406: Output Parameter:
1407: + nproc - number of processors that are connected to this one
1408: . proc - neighboring processors
1409: . numproc - number of indices for each processor
1410: - indices - indices of local nodes shared with neighbor (sorted by global numbering)
1412: Level: advanced
1414: .seealso: ISLocalToGlobalMappingDestroy(), ISLocalToGlobalMappingCreateIS(), ISLocalToGlobalMappingCreate(),
1415: ISLocalToGlobalMappingGetInfo()
1416: @*/
1417: PetscErrorCode ISLocalToGlobalMappingRestoreBlockInfo(ISLocalToGlobalMapping mapping,PetscInt *nproc,PetscInt *procs[],PetscInt *numprocs[],PetscInt **indices[])
1418: {
1423: if (mapping->info_free) {
1424: PetscFree(*numprocs);
1425: if (*indices) {
1426: PetscInt i;
1428: PetscFree((*indices)[0]);
1429: for (i=1; i<*nproc; i++) {
1430: PetscFree((*indices)[i]);
1431: }
1432: PetscFree(*indices);
1433: }
1434: }
1435: *nproc = 0;
1436: *procs = NULL;
1437: *numprocs = NULL;
1438: *indices = NULL;
1439: return(0);
1440: }
1442: /*@C
1443: ISLocalToGlobalMappingGetInfo - Gets the neighbor information for each processor and
1444: each index shared by more than one processor
1446: Collective on ISLocalToGlobalMapping
1448: Input Parameters:
1449: . mapping - the mapping from local to global indexing
1451: Output Parameter:
1452: + nproc - number of processors that are connected to this one
1453: . proc - neighboring processors
1454: . numproc - number of indices for each subdomain (processor)
1455: - indices - indices of nodes (in local numbering) shared with neighbors (sorted by global numbering)
1457: Level: advanced
1459: Concepts: mapping^local to global
1461: Notes: The user needs to call ISLocalToGlobalMappingRestoreInfo when the data is no longer needed.
1463: Fortran Usage:
1464: $ ISLocalToGlobalMpngGetInfoSize(ISLocalToGlobalMapping,PetscInt nproc,PetscInt numprocmax,ierr) followed by
1465: $ ISLocalToGlobalMappingGetInfo(ISLocalToGlobalMapping,PetscInt nproc, PetscInt procs[nproc],PetscInt numprocs[nproc],
1466: PetscInt indices[nproc][numprocmax],ierr)
1467: There is no ISLocalToGlobalMappingRestoreInfo() in Fortran. You must make sure that procs[], numprocs[] and
1468: indices[][] are large enough arrays, either by allocating them dynamically or defining static ones large enough.
1471: .seealso: ISLocalToGlobalMappingDestroy(), ISLocalToGlobalMappingCreateIS(), ISLocalToGlobalMappingCreate(),
1472: ISLocalToGlobalMappingRestoreInfo()
1473: @*/
1474: PetscErrorCode ISLocalToGlobalMappingGetInfo(ISLocalToGlobalMapping mapping,PetscInt *nproc,PetscInt *procs[],PetscInt *numprocs[],PetscInt **indices[])
1475: {
1477: PetscInt **bindices = NULL,*bnumprocs = NULL,bs = mapping->bs,i,j,k;
1481: ISLocalToGlobalMappingGetBlockInfo(mapping,nproc,procs,&bnumprocs,&bindices);
1482: if (bs > 1) { /* we need to expand the cached info */
1483: PetscCalloc1(*nproc,&*indices);
1484: PetscCalloc1(*nproc,&*numprocs);
1485: for (i=0; i<*nproc; i++) {
1486: PetscMalloc1(bs*bnumprocs[i],&(*indices)[i]);
1487: for (j=0; j<bnumprocs[i]; j++) {
1488: for (k=0; k<bs; k++) {
1489: (*indices)[i][j*bs+k] = bs*bindices[i][j] + k;
1490: }
1491: }
1492: (*numprocs)[i] = bnumprocs[i]*bs;
1493: }
1494: mapping->info_free = PETSC_TRUE;
1495: } else {
1496: *numprocs = bnumprocs;
1497: *indices = bindices;
1498: }
1499: return(0);
1500: }
1502: /*@C
1503: ISLocalToGlobalMappingRestoreInfo - Frees the memory allocated by ISLocalToGlobalMappingGetInfo()
1505: Collective on ISLocalToGlobalMapping
1507: Input Parameters:
1508: . mapping - the mapping from local to global indexing
1510: Output Parameter:
1511: + nproc - number of processors that are connected to this one
1512: . proc - neighboring processors
1513: . numproc - number of indices for each processor
1514: - indices - indices of local nodes shared with neighbor (sorted by global numbering)
1516: Level: advanced
1518: .seealso: ISLocalToGlobalMappingDestroy(), ISLocalToGlobalMappingCreateIS(), ISLocalToGlobalMappingCreate(),
1519: ISLocalToGlobalMappingGetInfo()
1520: @*/
1521: PetscErrorCode ISLocalToGlobalMappingRestoreInfo(ISLocalToGlobalMapping mapping,PetscInt *nproc,PetscInt *procs[],PetscInt *numprocs[],PetscInt **indices[])
1522: {
1526: ISLocalToGlobalMappingRestoreBlockInfo(mapping,nproc,procs,numprocs,indices);
1527: return(0);
1528: }
1530: /*@C
1531: ISLocalToGlobalMappingGetNodeInfo - Gets the neighbor information for each node
1533: Collective on ISLocalToGlobalMapping
1535: Input Parameters:
1536: . mapping - the mapping from local to global indexing
1538: Output Parameter:
1539: + nnodes - number of local nodes (same ISLocalToGlobalMappingGetSize())
1540: . count - number of neighboring processors per node
1541: - indices - indices of processes sharing the node (sorted)
1543: Level: advanced
1545: Concepts: mapping^local to global
1547: Notes: The user needs to call ISLocalToGlobalMappingRestoreInfo when the data is no longer needed.
1549: .seealso: ISLocalToGlobalMappingDestroy(), ISLocalToGlobalMappingCreateIS(), ISLocalToGlobalMappingCreate(),
1550: ISLocalToGlobalMappingGetInfo(), ISLocalToGlobalMappingRestoreNodeInfo()
1551: @*/
1552: PetscErrorCode ISLocalToGlobalMappingGetNodeInfo(ISLocalToGlobalMapping mapping,PetscInt *nnodes,PetscInt *count[],PetscInt **indices[])
1553: {
1554: PetscInt n;
1559: ISLocalToGlobalMappingGetSize(mapping,&n);
1560: if (!mapping->info_nodec) {
1561: PetscInt i,m,n_neigh,*neigh,*n_shared,**shared;
1563: PetscCalloc1(n+1,&mapping->info_nodec); /* always allocate to flag setup */
1564: PetscMalloc1(n,&mapping->info_nodei);
1565: ISLocalToGlobalMappingGetInfo(mapping,&n_neigh,&neigh,&n_shared,&shared);
1566: for (i=0,m=0;i<n;i++) { mapping->info_nodec[i] = 1; m++; }
1567: for (i=1;i<n_neigh;i++) {
1568: PetscInt j;
1570: m += n_shared[i];
1571: for (j=0;j<n_shared[i];j++) mapping->info_nodec[shared[i][j]] += 1;
1572: }
1573: if (n) { PetscMalloc1(m,&mapping->info_nodei[0]); }
1574: for (i=1;i<n;i++) mapping->info_nodei[i] = mapping->info_nodei[i-1] + mapping->info_nodec[i-1];
1575: PetscMemzero(mapping->info_nodec,n*sizeof(PetscInt));
1576: for (i=0;i<n;i++) { mapping->info_nodec[i] = 1; mapping->info_nodei[i][0] = neigh[0]; }
1577: for (i=1;i<n_neigh;i++) {
1578: PetscInt j;
1580: for (j=0;j<n_shared[i];j++) {
1581: PetscInt k = shared[i][j];
1583: mapping->info_nodei[k][mapping->info_nodec[k]] = neigh[i];
1584: mapping->info_nodec[k] += 1;
1585: }
1586: }
1587: for (i=0;i<n;i++) { PetscSortRemoveDupsInt(&mapping->info_nodec[i],mapping->info_nodei[i]); }
1588: ISLocalToGlobalMappingRestoreInfo(mapping,&n_neigh,&neigh,&n_shared,&shared);
1589: }
1590: if (nnodes) *nnodes = n;
1591: if (count) *count = mapping->info_nodec;
1592: if (indices) *indices = mapping->info_nodei;
1593: return(0);
1594: }
1596: /*@C
1597: ISLocalToGlobalMappingRestoreNodeInfo - Frees the memory allocated by ISLocalToGlobalMappingGetNodeInfo()
1599: Collective on ISLocalToGlobalMapping
1601: Input Parameters:
1602: . mapping - the mapping from local to global indexing
1604: Output Parameter:
1605: + nnodes - number of local nodes
1606: . count - number of neighboring processors per node
1607: - indices - indices of processes sharing the node (sorted)
1609: Level: advanced
1611: .seealso: ISLocalToGlobalMappingDestroy(), ISLocalToGlobalMappingCreateIS(), ISLocalToGlobalMappingCreate(),
1612: ISLocalToGlobalMappingGetInfo()
1613: @*/
1614: PetscErrorCode ISLocalToGlobalMappingRestoreNodeInfo(ISLocalToGlobalMapping mapping,PetscInt *nnodes,PetscInt *count[],PetscInt **indices[])
1615: {
1618: if (nnodes) *nnodes = 0;
1619: if (count) *count = NULL;
1620: if (indices) *indices = NULL;
1621: return(0);
1622: }
1624: /*@C
1625: ISLocalToGlobalMappingGetIndices - Get global indices for every local point that is mapped
1627: Not Collective
1629: Input Arguments:
1630: . ltog - local to global mapping
1632: Output Arguments:
1633: . array - array of indices, the length of this array may be obtained with ISLocalToGlobalMappingGetSize()
1635: Level: advanced
1637: Notes:
1638: ISLocalToGlobalMappingGetSize() returns the length the this array
1640: .seealso: ISLocalToGlobalMappingCreate(), ISLocalToGlobalMappingApply(), ISLocalToGlobalMappingRestoreIndices(), ISLocalToGlobalMappingGetBlockIndices(), ISLocalToGlobalMappingRestoreBlockIndices()
1641: @*/
1642: PetscErrorCode ISLocalToGlobalMappingGetIndices(ISLocalToGlobalMapping ltog,const PetscInt **array)
1643: {
1647: if (ltog->bs == 1) {
1648: *array = ltog->indices;
1649: } else {
1650: PetscInt *jj,k,i,j,n = ltog->n, bs = ltog->bs;
1651: const PetscInt *ii;
1654: PetscMalloc1(bs*n,&jj);
1655: *array = jj;
1656: k = 0;
1657: ii = ltog->indices;
1658: for (i=0; i<n; i++)
1659: for (j=0; j<bs; j++)
1660: jj[k++] = bs*ii[i] + j;
1661: }
1662: return(0);
1663: }
1665: /*@C
1666: ISLocalToGlobalMappingRestoreIndices - Restore indices obtained with ISLocalToGlobalMappingGetIndices()
1668: Not Collective
1670: Input Arguments:
1671: + ltog - local to global mapping
1672: - array - array of indices
1674: Level: advanced
1676: .seealso: ISLocalToGlobalMappingCreate(), ISLocalToGlobalMappingApply(), ISLocalToGlobalMappingGetIndices()
1677: @*/
1678: PetscErrorCode ISLocalToGlobalMappingRestoreIndices(ISLocalToGlobalMapping ltog,const PetscInt **array)
1679: {
1683: if (ltog->bs == 1 && *array != ltog->indices) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_BADPTR,"Trying to return mismatched pointer");
1685: if (ltog->bs > 1) {
1687: PetscFree(*(void**)array);
1688: }
1689: return(0);
1690: }
1692: /*@C
1693: ISLocalToGlobalMappingGetBlockIndices - Get global indices for every local block
1695: Not Collective
1697: Input Arguments:
1698: . ltog - local to global mapping
1700: Output Arguments:
1701: . array - array of indices
1703: Level: advanced
1705: .seealso: ISLocalToGlobalMappingCreate(), ISLocalToGlobalMappingApply(), ISLocalToGlobalMappingRestoreBlockIndices()
1706: @*/
1707: PetscErrorCode ISLocalToGlobalMappingGetBlockIndices(ISLocalToGlobalMapping ltog,const PetscInt **array)
1708: {
1712: *array = ltog->indices;
1713: return(0);
1714: }
1716: /*@C
1717: ISLocalToGlobalMappingRestoreBlockIndices - Restore indices obtained with ISLocalToGlobalMappingGetBlockIndices()
1719: Not Collective
1721: Input Arguments:
1722: + ltog - local to global mapping
1723: - array - array of indices
1725: Level: advanced
1727: .seealso: ISLocalToGlobalMappingCreate(), ISLocalToGlobalMappingApply(), ISLocalToGlobalMappingGetIndices()
1728: @*/
1729: PetscErrorCode ISLocalToGlobalMappingRestoreBlockIndices(ISLocalToGlobalMapping ltog,const PetscInt **array)
1730: {
1734: if (*array != ltog->indices) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_BADPTR,"Trying to return mismatched pointer");
1735: *array = NULL;
1736: return(0);
1737: }
1739: /*@C
1740: ISLocalToGlobalMappingConcatenate - Create a new mapping that concatenates a list of mappings
1742: Not Collective
1744: Input Arguments:
1745: + comm - communicator for the new mapping, must contain the communicator of every mapping to concatenate
1746: . n - number of mappings to concatenate
1747: - ltogs - local to global mappings
1749: Output Arguments:
1750: . ltogcat - new mapping
1752: Note: this currently always returns a mapping with block size of 1
1754: Developer Note: If all the input mapping have the same block size we could easily handle that as a special case
1756: Level: advanced
1758: .seealso: ISLocalToGlobalMappingCreate()
1759: @*/
1760: PetscErrorCode ISLocalToGlobalMappingConcatenate(MPI_Comm comm,PetscInt n,const ISLocalToGlobalMapping ltogs[],ISLocalToGlobalMapping *ltogcat)
1761: {
1762: PetscInt i,cnt,m,*idx;
1766: if (n < 0) SETERRQ1(comm,PETSC_ERR_ARG_OUTOFRANGE,"Must have a non-negative number of mappings, given %D",n);
1770: for (cnt=0,i=0; i<n; i++) {
1771: ISLocalToGlobalMappingGetSize(ltogs[i],&m);
1772: cnt += m;
1773: }
1774: PetscMalloc1(cnt,&idx);
1775: for (cnt=0,i=0; i<n; i++) {
1776: const PetscInt *subidx;
1777: ISLocalToGlobalMappingGetSize(ltogs[i],&m);
1778: ISLocalToGlobalMappingGetIndices(ltogs[i],&subidx);
1779: PetscMemcpy(&idx[cnt],subidx,m*sizeof(PetscInt));
1780: ISLocalToGlobalMappingRestoreIndices(ltogs[i],&subidx);
1781: cnt += m;
1782: }
1783: ISLocalToGlobalMappingCreate(comm,1,cnt,idx,PETSC_OWN_POINTER,ltogcat);
1784: return(0);
1785: }
1787: /*MC
1788: ISLOCALTOGLOBALMAPPINGBASIC - basic implementation of the ISLocalToGlobalMapping object. When ISGlobalToLocalMappingApply() is
1789: used this is good for only small and moderate size problems.
1791: Options Database Keys:
1792: + -islocaltoglobalmapping_type basic - select this method
1794: Level: beginner
1796: .seealso: ISLocalToGlobalMappingCreate(), ISLocalToGlobalMappingSetType(), ISLOCALTOGLOBALMAPPINGHASH
1797: M*/
1798: PETSC_EXTERN PetscErrorCode ISLocalToGlobalMappingCreate_Basic(ISLocalToGlobalMapping ltog)
1799: {
1801: ltog->ops->globaltolocalmappingapply = ISGlobalToLocalMappingApply_Basic;
1802: ltog->ops->globaltolocalmappingsetup = ISGlobalToLocalMappingSetUp_Basic;
1803: ltog->ops->globaltolocalmappingapplyblock = ISGlobalToLocalMappingApplyBlock_Basic;
1804: ltog->ops->destroy = ISLocalToGlobalMappingDestroy_Basic;
1805: return(0);
1806: }
1808: /*MC
1809: ISLOCALTOGLOBALMAPPINGHASH - hash implementation of the ISLocalToGlobalMapping object. When ISGlobalToLocalMappingApply() is
1810: used this is good for large memory problems.
1812: Options Database Keys:
1813: + -islocaltoglobalmapping_type hash - select this method
1816: Notes:
1817: This is selected automatically for large problems if the user does not set the type.
1819: Level: beginner
1821: .seealso: ISLocalToGlobalMappingCreate(), ISLocalToGlobalMappingSetType(), ISLOCALTOGLOBALMAPPINGHASH
1822: M*/
1823: PETSC_EXTERN PetscErrorCode ISLocalToGlobalMappingCreate_Hash(ISLocalToGlobalMapping ltog)
1824: {
1826: ltog->ops->globaltolocalmappingapply = ISGlobalToLocalMappingApply_Hash;
1827: ltog->ops->globaltolocalmappingsetup = ISGlobalToLocalMappingSetUp_Hash;
1828: ltog->ops->globaltolocalmappingapplyblock = ISGlobalToLocalMappingApplyBlock_Hash;
1829: ltog->ops->destroy = ISLocalToGlobalMappingDestroy_Hash;
1830: return(0);
1831: }
1834: /*@C
1835: ISLocalToGlobalMappingRegister - Adds a method for applying a global to local mapping with an ISLocalToGlobalMapping
1837: Not Collective
1839: Input Parameters:
1840: + sname - name of a new method
1841: - routine_create - routine to create method context
1843: Notes:
1844: ISLocalToGlobalMappingRegister() may be called multiple times to add several user-defined mappings.
1846: Sample usage:
1847: .vb
1848: ISLocalToGlobalMappingRegister("my_mapper",MyCreate);
1849: .ve
1851: Then, your mapping can be chosen with the procedural interface via
1852: $ ISLocalToGlobalMappingSetType(ltog,"my_mapper")
1853: or at runtime via the option
1854: $ -islocaltoglobalmapping_type my_mapper
1856: Level: advanced
1858: .keywords: ISLocalToGlobalMappingType, register
1860: .seealso: ISLocalToGlobalMappingRegisterAll(), ISLocalToGlobalMappingRegisterDestroy(), ISLOCALTOGLOBALMAPPINGBASIC, ISLOCALTOGLOBALMAPPINGHASH
1862: @*/
1863: PetscErrorCode ISLocalToGlobalMappingRegister(const char sname[],PetscErrorCode (*function)(ISLocalToGlobalMapping))
1864: {
1868: ISInitializePackage();
1869: PetscFunctionListAdd(&ISLocalToGlobalMappingList,sname,function);
1870: return(0);
1871: }
1873: /*@C
1874: ISLocalToGlobalMappingSetType - Builds ISLocalToGlobalMapping for a particular global to local mapping approach.
1876: Logically Collective on ISLocalToGlobalMapping
1878: Input Parameters:
1879: + ltog - the ISLocalToGlobalMapping object
1880: - type - a known method
1882: Options Database Key:
1883: . -islocaltoglobalmapping_type <method> - Sets the method; use -help for a list
1884: of available methods (for instance, basic or hash)
1886: Notes:
1887: See "petsc/include/petscis.h" for available methods
1889: Normally, it is best to use the ISLocalToGlobalMappingSetFromOptions() command and
1890: then set the ISLocalToGlobalMapping type from the options database rather than by using
1891: this routine.
1893: Level: intermediate
1895: Developer Note: ISLocalToGlobalMappingRegister() is used to add new types to ISLocalToGlobalMappingList from which they
1896: are accessed by ISLocalToGlobalMappingSetType().
1898: .keywords: ISLocalToGlobalMapping, set, method
1900: .seealso: PCSetType(), ISLocalToGlobalMappingType, ISLocalToGlobalMappingRegister(), ISLocalToGlobalMappingCreate()
1902: @*/
1903: PetscErrorCode ISLocalToGlobalMappingSetType(ISLocalToGlobalMapping ltog, ISLocalToGlobalMappingType type)
1904: {
1905: PetscErrorCode ierr,(*r)(ISLocalToGlobalMapping);
1906: PetscBool match;
1912: PetscObjectTypeCompare((PetscObject)ltog,type,&match);
1913: if (match) return(0);
1915: PetscFunctionListFind(ISLocalToGlobalMappingList,type,&r);
1916: if (!r) SETERRQ1(PetscObjectComm((PetscObject)ltog),PETSC_ERR_ARG_UNKNOWN_TYPE,"Unable to find requested ISLocalToGlobalMapping type %s",type);
1917: /* Destroy the previous private LTOG context */
1918: if (ltog->ops->destroy) {
1919: (*ltog->ops->destroy)(ltog);
1920: ltog->ops->destroy = NULL;
1921: }
1922: PetscObjectChangeTypeName((PetscObject)ltog,type);
1923: (*r)(ltog);
1924: return(0);
1925: }
1927: PetscBool ISLocalToGlobalMappingRegisterAllCalled = PETSC_FALSE;
1929: /*@C
1930: ISLocalToGlobalMappingRegisterAll - Registers all of the local to global mapping components in the IS package.
1932: Not Collective
1934: Level: advanced
1936: .keywords: IS, register, all
1937: .seealso: ISRegister(), ISLocalToGlobalRegister()
1938: @*/
1939: PetscErrorCode ISLocalToGlobalMappingRegisterAll(void)
1940: {
1944: if (ISLocalToGlobalMappingRegisterAllCalled) return(0);
1945: ISLocalToGlobalMappingRegisterAllCalled = PETSC_TRUE;
1947: ISLocalToGlobalMappingRegister(ISLOCALTOGLOBALMAPPINGBASIC, ISLocalToGlobalMappingCreate_Basic);
1948: ISLocalToGlobalMappingRegister(ISLOCALTOGLOBALMAPPINGHASH, ISLocalToGlobalMappingCreate_Hash);
1949: return(0);
1950: }