source: issm/trunk-jpl/src/c/modules/ModelProcessorx/ElementsAndVerticesPartitioning.cpp@ 15771

Last change on this file since 15771 was 15771, checked in by Mathieu Morlighem, 12 years ago

CHG: Diagnostic is now Stressbalance
File size: 4.9 KB
Line 
1/*!\file: ElementsAndVerticesPartitioning.cpp
2 * \brief: partition elements and nodes and vertices
3 */
4
5#ifdef HAVE_CONFIG_H
6 #include <config.h>
7#else
8#error "Cannot compile with HAVE_CONFIG_H symbol! run configure first!"
9#endif
10
11#include <string.h>
12#include "../../classes/classes.h"
13#include "../../shared/shared.h"
14#include "../MeshPartitionx/MeshPartitionx.h"
15#include "../ModelProcessorx/ModelProcessorx.h"
16
17void ElementsAndVerticesPartitioning(bool** pmy_elements, int** pmy_vertices, IoModel* iomodel){
18
19 int i;
20
21 int my_rank;
22 int num_procs;
23 int numberofelements2d;
24 int numberofvertices2d;
25 int numlayers;
26 int numrifts;
27 int numvertex_pairing;
28
29 /*output: */
30 bool *my_elements = NULL;
31 int *my_vertices = NULL;
32
33 /*intermediary: */
34 int *epart = NULL; //element partitioning.
35 int *npart = NULL; //node partitioning.
36 int elements_width; //number of columns in elements (2d->3, 3d->6)
37 int el1,el2;
38 int *elements2d = NULL;
39 int *vertex_pairing = NULL;
40 IssmDouble *riftinfo = NULL;
41
42 /*Get my_rank:*/
43 my_rank = IssmComm::GetRank();
44 num_procs = IssmComm::GetSize();
45
46 /*Fetch parameters: */
47 iomodel->Constant(&numberofelements2d,MeshNumberofelements2dEnum);
48 iomodel->Constant(&numberofvertices2d,MeshNumberofvertices2dEnum);
49 iomodel->Constant(&numlayers,MeshNumberoflayersEnum);
50 iomodel->Constant(&numrifts,RiftsNumriftsEnum);
51
52 /*First, check that partitioning has not yet been carryed out. Just check whether my_elements pointers is not already assigned a value: */
53 if (*pmy_elements)return;
54
55 /*Number of vertices per elements, needed to correctly retrieve data: */
56 /*Determine parallel partitioning of elements: we use Metis for now. First load the data, then partition*/
57 if(iomodel->dim==2){
58 elements_width=3; //tria elements
59 }
60 else{
61 elements_width=6; //penta elements
62 iomodel->FetchData(&elements2d,NULL,NULL,MeshElements2dEnum);
63 }
64
65 MeshPartitionx(&epart,&npart,iomodel->numberofelements,iomodel->numberofvertices,iomodel->elements,numberofelements2d,numberofvertices2d,elements2d,numlayers,elements_width,iomodel->dim,num_procs);
66
67 /*Free elements2d: */
68 xDelete<int>(elements2d);
69
70 /*Deal with rifts, they have to be included into one partition only, not several: */
71 if(numrifts){
72 iomodel->FetchData(&riftinfo,&numrifts,NULL,RiftsRiftstructEnum);
73 for(i=0;i<numrifts;i++){
74 el1=reCast<int>(*(riftinfo+RIFTINFOSIZE*i+2))-1; //matlab indexing to c indexing
75 el2=reCast<int>(*(riftinfo+RIFTINFOSIZE*i+3))-1; //matlab indexing to c indexing
76 epart[el2]=epart[el1]; //ensures that this pair of elements will be in the same partition, as well as the corresponding vertices;
77 }
78 iomodel->DeleteData(riftinfo,RiftsRiftstructEnum);
79 }
80
81 /*Used later on: */
82 my_vertices=xNewZeroInit<int>(iomodel->numberofvertices);
83 my_elements=xNewZeroInit<bool>(iomodel->numberofelements);
84
85 /*Start figuring out, out of the partition, which elements belong to this cpu: */
86 for (i=0;i<iomodel->numberofelements;i++){
87
88 /*!All elements have been partitioned above, only deal with elements for this cpu: */
89 if(my_rank==epart[i]){
90
91 my_elements[i]=true;
92
93 /*Now that we are here, we can also start building the list of vertices belonging to this cpu partition: we use
94 *the element index to do this. For each element n, we know index[n][0:2] holds the indices (matlab indexing)
95 into the vertices coordinates. If we start plugging 1 into my_vertices for each index[n][i] (i=0:2), then my_vertices
96 will hold which vertices belong to this partition*/
97 my_vertices[iomodel->elements[elements_width*i+0]-1]=1;
98 my_vertices[iomodel->elements[elements_width*i+1]-1]=1;
99 my_vertices[iomodel->elements[elements_width*i+2]-1]=1;
100
101 if(elements_width==6){
102 my_vertices[iomodel->elements[elements_width*i+3]-1]=1;
103 my_vertices[iomodel->elements[elements_width*i+4]-1]=1;
104 my_vertices[iomodel->elements[elements_width*i+5]-1]=1;
105 }
106 }
107 }
108
109 /*We might have vertex_pairing in which case, some vertices have to be cloned:
110 * penpair has 2 nodes that are poointing toward 2 vertices.
111 * The 2 vertices must be in the same cpu as the penpair*/
112 iomodel->FetchData(&vertex_pairing,&numvertex_pairing,NULL,StressbalanceVertexPairingEnum);
113 for(i=0;i<numvertex_pairing;i++){
114 if(my_vertices[vertex_pairing[2*i+0]-1] && !my_vertices[vertex_pairing[2*i+1]-1]){
115 my_vertices[vertex_pairing[2*i+1]-1]=2; //to know that these elements are not on the partition
116 }
117 }
118 xDelete<int>(vertex_pairing);
119 iomodel->FetchData(&vertex_pairing,&numvertex_pairing,NULL,MasstransportVertexPairingEnum);
120 for(i=0;i<numvertex_pairing;i++){
121 if(my_vertices[vertex_pairing[2*i+0]-1] && !my_vertices[vertex_pairing[2*i+1]-1]){
122 my_vertices[vertex_pairing[2*i+1]-1]=2; //to know that these elements are not on the partition
123 }
124 }
125 xDelete<int>(vertex_pairing);
126
127 /*Free ressources:*/
128 xDelete<int>(npart);
129 xDelete<int>(epart);
130
131 /*Assign output pointers:*/
132 *pmy_elements=my_elements;
133 *pmy_vertices=my_vertices;
134}
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