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

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Revision 1720 - (show annotations)
Fri Aug 22 00:24:35 2008 UTC (11 years ago) by gross
File MIME type: text/plain
File size: 10543 byte(s)
PARAMETIS macro renamed to USE_PARAMETIS as set by scons
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: optimizes the distribution of DOFs across processors */
19 /* using ParMETIS. On return a new distribution is given and the globalDOF are relabled */
20 /* accordingly but the mesh has not been redesitributed yet */
21
22 /**************************************************************/
23
24 #include "Mesh.h"
25 #include "IndexList.h"
26 #ifdef _OPENMP
27 #include <omp.h>
28 #endif
29 #ifdef USE_PARMETIS
30 #include "parmetis.h"
31 #endif
32
33 /**************************************************************/
34
35 void Finley_Mesh_optimizeDOFDistribution(Finley_Mesh* in,dim_t *distribution) {
36
37 dim_t dim, i,j,k, myNumVertices,p, mpiSize, len, globalNumVertices,*partition_count=NULL, *new_distribution=NULL, *loc_partition_count=NULL;
38 bool_t *setNewDOFId=NULL;
39 index_t myFirstVertex, myLastVertex, firstVertex, lastVertex, *newGlobalDOFID=NULL;
40 size_t mpiSize_size;
41 index_t* partition=NULL;
42 Paso_Pattern *pattern=NULL;
43 Paso_MPI_rank myRank,dest,source,current_rank, rank;
44 Finley_IndexList* index_list=NULL;
45 float *xyz=NULL;
46 int c;
47
48 #ifdef PASO_MPI
49 MPI_Status status;
50 #endif
51
52 if (in==NULL) return;
53 if (in->Nodes == NULL) return;
54
55 myRank=in->MPIInfo->rank;
56 mpiSize=in->MPIInfo->size;
57 mpiSize_size=mpiSize*sizeof(dim_t);
58 dim=in->Nodes->numDim;
59 /* first step is to distribute the elements according to a global X of DOF */
60
61 myFirstVertex=distribution[myRank];
62 myLastVertex=distribution[myRank+1];
63 myNumVertices=myLastVertex-myFirstVertex;
64 globalNumVertices=distribution[mpiSize];
65 len=0;
66 for (p=0;p<mpiSize;++p) len=MAX(len,distribution[p+1]-distribution[p]);
67 partition=TMPMEMALLOC(len,index_t); /* len is used for the sending around of partition later on */
68 xyz=TMPMEMALLOC(myNumVertices*dim,float);
69 partition_count=TMPMEMALLOC(mpiSize+1,dim_t);
70 new_distribution=TMPMEMALLOC(mpiSize+1,dim_t);
71 newGlobalDOFID=TMPMEMALLOC(len,index_t);
72 setNewDOFId=TMPMEMALLOC(in->Nodes->numNodes,bool_t);
73 if (!(Finley_checkPtr(partition) || Finley_checkPtr(xyz) || Finley_checkPtr(partition_count) || Finley_checkPtr(partition_count) || Finley_checkPtr(newGlobalDOFID) || Finley_checkPtr(setNewDOFId))) {
74 dim_t *recvbuf=TMPMEMALLOC(mpiSize*mpiSize,dim_t);
75
76 /* set the coordinates: *?
77 /* it is assumed that at least one node on this processor provides a coordinate */
78 #pragma omp parallel for private(i,j,k)
79 for (i=0;i<in->Nodes->numNodes;++i) {
80 k=in->Nodes->globalDegreesOfFreedom[i]-myFirstVertex;
81 if ((k>=0) && (k<myNumVertices)) {
82 for (j=0;j<dim;++j) xyz[k*dim+j]=(float)(in->Nodes->Coordinates[INDEX2(j,i,dim)]);
83 }
84 }
85
86 index_list=TMPMEMALLOC(myNumVertices,Finley_IndexList);
87 /* ksteube CSR of DOF IDs */
88 /* create the adjacency structure xadj and adjncy */
89 if (! Finley_checkPtr(index_list)) {
90 #pragma omp parallel private(i)
91 {
92 #pragma omp for schedule(static)
93 for(i=0;i<myNumVertices;++i) {
94 index_list[i].extension=NULL;
95 index_list[i].n=0;
96 }
97 /* ksteube build CSR format */
98 /* insert contributions from element matrices into colums index index_list: */
99 Finley_IndexList_insertElementsWithRowRange(index_list, myFirstVertex, myLastVertex,
100 in->Elements,in->Nodes->globalDegreesOfFreedom,
101 in->Nodes->globalDegreesOfFreedom);
102 Finley_IndexList_insertElementsWithRowRange(index_list, myFirstVertex, myLastVertex,
103 in->FaceElements,in->Nodes->globalDegreesOfFreedom,
104 in->Nodes->globalDegreesOfFreedom);
105 Finley_IndexList_insertElementsWithRowRange(index_list, myFirstVertex, myLastVertex,
106 in->ContactElements,in->Nodes->globalDegreesOfFreedom,
107 in->Nodes->globalDegreesOfFreedom);
108 Finley_IndexList_insertElementsWithRowRange(index_list, myFirstVertex, myLastVertex,
109 in->Points,in->Nodes->globalDegreesOfFreedom,
110 in->Nodes->globalDegreesOfFreedom);
111 }
112
113 /* create the local matrix pattern */
114 pattern=Finley_IndexList_createPattern(0,myNumVertices,index_list,0,globalNumVertices,0);
115
116 /* clean up index list */
117 if (index_list!=NULL) {
118 #pragma omp parallel for private(i)
119 for(i=0;i<myNumVertices;++i) Finley_IndexList_free(index_list[i].extension);
120 }
121
122 if (Finley_noError()) {
123
124 #ifdef USE_PARMETIS
125
126 if (in->MPIInfo->size>1) {
127 int i;
128 int wgtflag = 0;
129 int numflag = 0; /* pattern->ptr is C style: starting from 0 instead of 1 */
130 int ncon = 1;
131 int edgecut;
132 int options[2];
133 float *tpwgts = TMPMEMALLOC(ncon*mpiSize,float);
134 float *ubvec = TMPMEMALLOC(ncon,float);
135 for (i=0; i<ncon*mpiSize; i++) tpwgts[i] = 1.0/(float)mpiSize;
136 for (i=0; i<ncon; i++) ubvec[i] = 1.05;
137 options[0] = 0;
138 options[1] = 15;
139 ParMETIS_V3_PartGeomKway(distribution,
140 pattern->ptr,
141 pattern->index,
142 NULL,
143 NULL,
144 &wgtflag,
145 &numflag,
146 &dim,
147 xyz,
148 &ncon,
149 &mpiSize,
150 tpwgts,
151 ubvec,
152 options,
153 &edgecut,
154 partition, /* new CPU ownership of elements */
155 &(in->MPIInfo->comm));
156 printf("ParMETIS number of edges cut by partitioning: %d\n", edgecut);
157 TMPMEMFREE(ubvec);
158 TMPMEMFREE(tpwgts);
159 } else {
160 for (i=0;i<myNumVertices;++i) partition[i]=0; /* CPU 0 owns it */
161 }
162 #else
163 for (i=0;i<myNumVertices;++i) partition[i]=myRank; /* CPU 0 owns it */
164 #endif
165
166 }
167
168 Paso_Pattern_free(pattern);
169
170 /* create a new distributioin and labeling of the DOF */
171 memset(new_distribution,0,mpiSize_size);
172 #pragma omp parallel private(loc_partition_count)
173 {
174 loc_partition_count=THREAD_MEMALLOC(mpiSize,dim_t);
175 memset(loc_partition_count,0,mpiSize_size);
176 #pragma omp for private(i)
177 for (i=0;i<myNumVertices;++i) loc_partition_count[partition[i]]++ ;
178 #pragma omp critical
179 {
180 for (i=0;i<mpiSize;++i) new_distribution[i]+=loc_partition_count[i];
181 }
182 THREAD_MEMFREE(loc_partition_count);
183 }
184 #ifdef PASO_MPI
185 /* recvbuf will be the concatenation of each CPU's contribution to new_distribution */
186 MPI_Allgather(new_distribution, mpiSize, MPI_INT, recvbuf, mpiSize, MPI_INT, in->MPIInfo->comm);
187 #else
188 for (i=0;i<mpiSize;++i) recvbuf[i]=new_distribution[i];
189 #endif
190 new_distribution[0]=0;
191 for (rank=0; rank<mpiSize;rank++) {
192 c=0;
193 for (i=0;i<myRank;++i) c+=recvbuf[rank+mpiSize*i];
194 for (i=0;i<myNumVertices;++i) {
195 if (rank==partition[i]) {
196 newGlobalDOFID[i]=new_distribution[rank]+c;
197 c++;
198 }
199 }
200 for (i=myRank+1;i<mpiSize;++i) c+=recvbuf[rank+mpiSize*i];
201 new_distribution[rank+1]=new_distribution[rank]+c;
202 }
203 TMPMEMFREE(recvbuf);
204
205 /* now the overlap needs to be created by sending the partition around*/
206
207 dest=Paso_MPIInfo_mod(mpiSize, myRank + 1);
208 source=Paso_MPIInfo_mod(mpiSize, myRank - 1);
209 current_rank=myRank;
210 #pragma omp parallel for private(i)
211 for (i=0;i<in->Nodes->numNodes;++i) setNewDOFId[i]=TRUE;
212
213 for (p=0; p< mpiSize; ++p) {
214
215 firstVertex=distribution[current_rank];
216 lastVertex=distribution[current_rank+1];
217 #pragma omp parallel for private(i,j,k)
218 for (i=0;i<in->Nodes->numNodes;++i) {
219 k=in->Nodes->globalDegreesOfFreedom[i];
220 if (setNewDOFId[i] && (firstVertex<=k) && (k<lastVertex)) {
221 in->Nodes->globalDegreesOfFreedom[i]=newGlobalDOFID[k-firstVertex];
222 setNewDOFId[i]=FALSE;
223 }
224 }
225
226 if (p<mpiSize-1) { /* the final send can be skipped */
227 #ifdef PASO_MPI
228 MPI_Sendrecv_replace(newGlobalDOFID,len, MPI_INT,
229 dest, in->MPIInfo->msg_tag_counter,
230 source, in->MPIInfo->msg_tag_counter,
231 in->MPIInfo->comm,&status);
232 #endif
233 in->MPIInfo->msg_tag_counter++;
234 current_rank=Paso_MPIInfo_mod(mpiSize, current_rank-1);
235 }
236 }
237 for (i=0;i<mpiSize+1;++i) distribution[i]=new_distribution[i];
238
239
240 }
241 TMPMEMFREE(index_list);
242 }
243 TMPMEMFREE(newGlobalDOFID);
244 TMPMEMFREE(setNewDOFId);
245 TMPMEMFREE(new_distribution);
246 TMPMEMFREE(partition_count);
247 TMPMEMFREE(partition);
248 TMPMEMFREE(xyz);
249 return;
250 }

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