/[escript]/trunk/finley/src/Mesh_prepare.c
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Contents of /trunk/finley/src/Mesh_prepare.c

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Revision 1388 - (show annotations)
Fri Jan 11 07:45:58 2008 UTC (11 years, 9 months ago) by trankine
File MIME type: text/plain
File size: 5158 byte(s)
And get the *(&(*&(* name right
1
2 /* $Id$ */
3
4 /*******************************************************
5 *
6 * Copyright 2003-2007 by ACceSS MNRF
7 * Copyright 2007 by University of Queensland
8 *
9 * http://esscc.uq.edu.au
10 * Primary Business: Queensland, Australia
11 * Licensed under the Open Software License version 3.0
12 * http://www.opensource.org/licenses/osl-3.0.php
13 *
14 *******************************************************/
15
16 /**************************************************************/
17
18 /* Finley: Mesh: prepares the mesh for further calculations */
19
20 /**************************************************************/
21
22 #include "Mesh.h"
23
24 /**************************************************************/
25
26 void Finley_Mesh_prepare(Finley_Mesh* in, bool_t optimize) {
27 dim_t newGlobalNumDOFs=0, numReducedNodes=0,i;
28 index_t* distribution=NULL, *maskReducedNodes=NULL, *indexReducedNodes=NULL;
29 if (in==NULL) return;
30 if (in->Nodes == NULL) return;
31
32 /* first step is to distribute the elements according to a global distribution of DOF */
33
34 distribution=TMPMEMALLOC(in->MPIInfo->size+1,index_t);
35 if (! Finley_checkPtr(distribution)) {
36 /* first we create dense labeling for the DOFs */
37 newGlobalNumDOFs=Finley_NodeFile_createDenseDOFLabeling(in->Nodes);
38
39 /* create a distribution of the global DOFs and determine
40 the MPI_rank controling the DOFs on this processor */
41 Paso_MPIInfo_setDistribution(in->MPIInfo,0,newGlobalNumDOFs-1,distribution);
42
43 /* now the mesh is re-distributed according to the mpiRankOfDOF vector */
44 /* this will redistribute the Nodes and Elements including overlap and will create an element coloring
45 but will not create any mappings (see later in this function) */
46 if (Finley_noError()) Finley_Mesh_distributeByRankOfDOF(in,distribution);
47 }
48
49 /* at this stage we are able to start an optimization of the DOF distribution using ParaMetis */
50 /* on return distribution is altered and new DOF ids have been assigned */
51 if (Finley_noError() && optimize && in->MPIInfo->size>1) {
52
53 Finley_Mesh_optimizeDOFDistribution(in,distribution);
54
55 if (Finley_noError()) Finley_Mesh_distributeByRankOfDOF(in,distribution);
56
57 }
58 /* now a local labeling of the DOF is introduced */
59 if (Finley_noError() && optimize) {
60 Finley_Mesh_optimizeDOFLabeling(in,distribution);
61 }
62 /* rearrange elements with the attempt to bring elements closer to memory locations of the nodes (distributed shared memory!): */
63 if (Finley_noError()) Finley_Mesh_optimizeElementOrdering(in);
64
65
66 /* create the global indices */
67 if (Finley_noError()) {
68 maskReducedNodes=TMPMEMALLOC(in->Nodes->numNodes,index_t);
69 indexReducedNodes=TMPMEMALLOC(in->Nodes->numNodes,index_t);
70 if (! ( Finley_checkPtr(maskReducedNodes) || Finley_checkPtr(indexReducedNodes) ) ) {
71
72 #pragma omp parallel for private(i) schedule(static)
73 for (i=0;i<in->Nodes->numNodes;++i) maskReducedNodes[i]=-1;
74
75 Finley_Mesh_markNodes(maskReducedNodes,0,in,1);
76
77 numReducedNodes=Finley_Util_packMask(in->Nodes->numNodes,maskReducedNodes,indexReducedNodes);
78
79 Finley_NodeFile_createDenseNodeLabeling(in->Nodes);
80 Finley_NodeFile_createDenseReducedNodeLabeling(in->Nodes,maskReducedNodes);
81 Finley_NodeFile_createDenseReducedDOFLabeling(in->Nodes,maskReducedNodes);
82 /* create the missing mappings */
83 if (Finley_noError()) Finley_Mesh_createNodeFileMappings(in,numReducedNodes,indexReducedNodes,distribution);
84 }
85
86 TMPMEMFREE(maskReducedNodes);
87 TMPMEMFREE(indexReducedNodes);
88 }
89
90 TMPMEMFREE(distribution);
91
92 return;
93 }
94
95 /* */
96 /* tries to reduce the coloring for all element files: */
97 /* */
98 void Finley_Mesh_createColoring(Finley_Mesh* in, index_t *node_localDOF_map) {
99 if (Finley_noError()) Finley_ElementFile_createColoring(in->Elements,in->Nodes->numNodes,node_localDOF_map);
100 if (Finley_noError()) Finley_ElementFile_createColoring(in->FaceElements,in->Nodes->numNodes,node_localDOF_map);
101 if (Finley_noError()) Finley_ElementFile_createColoring(in->Points,in->Nodes->numNodes,node_localDOF_map);
102 if (Finley_noError()) Finley_ElementFile_createColoring(in->ContactElements,in->Nodes->numNodes,node_localDOF_map);
103 }
104 /* */
105 /* redistribute elements to minimize communication during assemblage */
106 /* */
107 void Finley_Mesh_optimizeElementOrdering(Finley_Mesh* in) {
108 if (Finley_noError()) Finley_ElementFile_optimizeOrdering(&(in->Elements));
109 if (Finley_noError()) Finley_ElementFile_optimizeOrdering(&(in->FaceElements));
110 if (Finley_noError()) Finley_ElementFile_optimizeOrdering(&(in->Points));
111 if (Finley_noError()) Finley_ElementFile_optimizeOrdering(&(in->ContactElements));
112 }

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