/[escript]/trunk/paso/src/Pattern_coupling.c
ViewVC logotype

Annotation of /trunk/paso/src/Pattern_coupling.c

Parent Directory Parent Directory | Revision Log Revision Log


Revision 2442 - (hide annotations)
Fri May 29 00:39:44 2009 UTC (10 years, 5 months ago) by artak
File MIME type: text/plain
File size: 8415 byte(s)
Some bugs are fixed.
1 jfenwick 1851
2     /*******************************************************
3     *
4     * Copyright (c) 2003-2008 by University of Queensland
5     * Earth Systems Science Computational Center (ESSCC)
6     * http://www.uq.edu.au/esscc
7     *
8     * Primary Business: Queensland, Australia
9     * Licensed under the Open Software License version 3.0
10     * http://www.opensource.org/licenses/osl-3.0.php
11     *
12     *******************************************************/
13    
14    
15     /**********************************************************************/
16    
17     /* Paso: Pattern: Paso_Pattern_coupling
18    
19     searches for a maximal independent set MIS in the matrix pattern
20     vertices in the maximal independent set are marked in mis_marker
21     nodes to be considered are marked by -1 on the input in mis_marker
22    
23     */
24     /**********************************************************************/
25    
26     /* Copyrights by ACcESS Australia 2003,2004,2005 */
27     /* Author: artak@uq.edu.au */
28    
29     /**************************************************************/
30    
31 phornby 1914 #include "PasoUtil.h"
32 phornby 1913 #include "Pattern_coupling.h"
33 artak 2381 #include <limits.h>
34 jfenwick 1851
35    
36     /***************************************************************/
37    
38     #define IS_AVAILABLE -1
39 artak 2442 #define IS_IN_SET -3 /* Week connection */
40     #define IS_REMOVED -4 /* strong */
41 jfenwick 1851
42 artak 1931 void Paso_Pattern_coup(Paso_SparseMatrix* A, index_t* mis_marker, double threshold) {
43 jfenwick 1851
44 artak 1881 dim_t i,j;
45 artak 2442 /*double sum;*/
46 artak 2107 index_t iptr,*index,*where_p,*diagptr;
47     bool_t passed=FALSE;
48 artak 1954 dim_t n=A->numRows;
49 artak 2107 diagptr=MEMALLOC(n,index_t);
50 artak 2122
51 jfenwick 1851 if (A->pattern->type & PATTERN_FORMAT_SYM) {
52 artak 2159 Paso_setError(TYPE_ERROR,"Paso_Pattern_coup: symmetric matrix pattern is not supported yet");
53 jfenwick 1851 return;
54     }
55    
56 artak 2107 #pragma omp parallel for private(i) schedule(static)
57     for (i=0;i<n;++i)
58     if(mis_marker[i]==IS_AVAILABLE)
59     mis_marker[i]=IS_IN_SET;
60 jfenwick 1851
61 artak 2107 #pragma omp parallel for private(i,index,where_p) schedule(static)
62     for (i=0;i<n;++i) {
63     diagptr[i]=A->pattern->ptr[i];
64     index=&(A->pattern->index[diagptr[i]]);
65     where_p=(index_t*)bsearch(&i,
66     index,
67     A->pattern->ptr[i + 1]-A->pattern->ptr[i],
68     sizeof(index_t),
69     Paso_comparIndex);
70     if (where_p==NULL) {
71 artak 2159 Paso_setError(VALUE_ERROR, "Paso_Pattern_coup: main diagonal element missing.");
72 artak 2107 } else {
73     diagptr[i]+=(index_t)(where_p-index);
74     }
75     }
76    
77    
78    
79     /*This loop cannot be parallelized, as order matters here.*/
80     for (i=0;i<n;++i) {
81     if (mis_marker[i]==IS_IN_SET) {
82     for (iptr=A->pattern->ptr[i];iptr<A->pattern->ptr[i+1]; ++iptr) {
83     j=A->pattern->index[iptr];
84     if (j!=i && ABS(A->val[iptr])>=threshold*ABS(A->val[diagptr[i]])) {
85     mis_marker[j]=IS_REMOVED;
86     }
87     }
88     }
89     }
90    
91    
92    
93     /*This loop cannot be parallelized, as order matters here.*/
94     for (i=0;i<n;i++) {
95     if (mis_marker[i]==IS_REMOVED) {
96 artak 2442 passed=TRUE;
97 artak 2107 for (iptr=A->pattern->ptr[i];iptr<A->pattern->ptr[i+1]; ++iptr) {
98     j=A->pattern->index[iptr];
99     if (mis_marker[j]==IS_IN_SET) {
100     if ((A->val[iptr]/A->val[diagptr[i]])>=-threshold) {
101     passed=TRUE;
102 artak 1902 }
103 artak 2107 else {
104     passed=FALSE;
105     break;
106 artak 1902 }
107 artak 2307 }
108 artak 2442 }
109     if (passed) mis_marker[i]=IS_IN_SET;
110 artak 1902 }
111 artak 2107 }
112 artak 2381 /* This check is to make sure we dont get some nusty rows which were not removed durring coarsening process.*/
113 artak 2122 /* TODO: we have to mechanism that this does not happend at all, and get rid of this 'If'. */
114 artak 2442 /*#pragma omp parallel for private(i,iptr,j,sum) schedule(static)
115 artak 2122 for (i=0;i<n;i++) {
116     if (mis_marker[i]==IS_REMOVED) {
117     sum=0;
118     for (iptr=A->pattern->ptr[i];iptr<A->pattern->ptr[i+1]; ++iptr) {
119     j=A->pattern->index[iptr];
120     if (mis_marker[j]==IS_REMOVED)
121     sum+=A->val[iptr];
122     }
123 artak 2381 if(ABS(sum)<1.e-25)
124 artak 2122 mis_marker[i]=IS_IN_SET;
125     }
126     }
127 artak 2442 */
128 artak 2122
129 jfenwick 1851 /* swap to TRUE/FALSE in mis_marker */
130     #pragma omp parallel for private(i) schedule(static)
131 artak 2107 for (i=0;i<n;i++) mis_marker[i]=(mis_marker[i]!=IS_IN_SET);
132    
133     MEMFREE(diagptr);
134 jfenwick 1851 }
135 artak 1890
136 artak 2381 /*
137     * Ruge-Stueben strength of connection mask.
138     *
139     */
140     void Paso_Pattern_RS(Paso_SparseMatrix* A, index_t* mis_marker, double theta)
141     {
142     dim_t i,n,j;
143     index_t iptr;
144     double threshold,min_offdiagonal;
145    
146     Paso_Pattern *out=NULL;
147    
148     Paso_IndexList* index_list=NULL;
149 artak 1890
150 artak 2381 index_list=TMPMEMALLOC(A->pattern->numOutput,Paso_IndexList);
151     if (! Paso_checkPtr(index_list)) {
152     #pragma omp parallel for private(i) schedule(static)
153     for(i=0;i<A->pattern->numOutput;++i) {
154     index_list[i].extension=NULL;
155     index_list[i].n=0;
156     }
157     }
158    
159    
160     n=A->numRows;
161     if (A->pattern->type & PATTERN_FORMAT_SYM) {
162     Paso_setError(TYPE_ERROR,"Paso_Pattern_RS: symmetric matrix pattern is not supported yet");
163     return;
164     }
165    
166     #pragma omp parallel for private(i,iptr,min_offdiagonal,threshold) schedule(static)
167     for (i=0;i<n;++i) {
168     if(mis_marker[i]==IS_AVAILABLE) {
169     min_offdiagonal = DBL_MAX;
170     for (iptr=A->pattern->ptr[i];iptr<A->pattern->ptr[i+1]; ++iptr) {
171     if(A->pattern->index[iptr] != i){
172     min_offdiagonal = MIN(min_offdiagonal,A->val[iptr]);
173     }
174     }
175    
176     threshold = theta*min_offdiagonal;
177     for (iptr=A->pattern->ptr[i];iptr<A->pattern->ptr[i+1]; ++iptr) {
178     j=A->pattern->index[iptr];
179     if(A->val[iptr]<=threshold) {
180     if(j!=i) {
181     Paso_IndexList_insertIndex(&(index_list[i]),j);
182 artak 2442 Paso_IndexList_insertIndex(&(index_list[j]),i);
183 artak 2381 }
184     }
185     }
186     }
187     }
188    
189     out=Paso_IndexList_createPattern(0, A->pattern->numOutput,index_list,0,A->pattern->numInput,0);
190    
191     /* clean up */
192     if (index_list!=NULL) {
193     #pragma omp parallel for private(i) schedule(static)
194     for(i=0;i<A->pattern->numOutput;++i) Paso_IndexList_free(index_list[i].extension);
195     }
196     TMPMEMFREE(index_list);
197    
198     Paso_Pattern_mis(out,mis_marker);
199     }
200    
201     void Paso_Pattern_Aggregiation(Paso_SparseMatrix* A, index_t* mis_marker, double theta)
202     {
203     dim_t i,j,n;
204     index_t iptr;
205     double diag,eps_Aii,val;
206     double* diags;
207    
208    
209     Paso_Pattern *out=NULL;
210     Paso_IndexList* index_list=NULL;
211    
212     n=A->numRows;
213     diags=MEMALLOC(n,double);
214    
215     index_list=TMPMEMALLOC(A->pattern->numOutput,Paso_IndexList);
216     if (! Paso_checkPtr(index_list)) {
217     #pragma omp parallel for private(i) schedule(static)
218     for(i=0;i<A->pattern->numOutput;++i) {
219     index_list[i].extension=NULL;
220     index_list[i].n=0;
221     }
222     }
223    
224     if (A->pattern->type & PATTERN_FORMAT_SYM) {
225     Paso_setError(TYPE_ERROR,"Paso_Pattern_RS: symmetric matrix pattern is not supported yet");
226     return;
227     }
228    
229    
230     #pragma omp parallel for private(i,iptr,diag) schedule(static)
231     for (i=0;i<n;++i) {
232     diag = 0;
233     for (iptr=A->pattern->ptr[i];iptr<A->pattern->ptr[i+1]; ++iptr) {
234     if(A->pattern->index[iptr] != i){
235     diag+=A->val[iptr];
236     }
237     }
238     diags[i]=ABS(diag);
239     }
240    
241    
242     #pragma omp parallel for private(i,iptr,j,val,eps_Aii) schedule(static)
243     for (i=0;i<n;++i) {
244     if (mis_marker[i]==IS_AVAILABLE) {
245     eps_Aii = theta*theta*diags[i];
246     val=0.;
247     for (iptr=A->pattern->ptr[i];iptr<A->pattern->ptr[i+1]; ++iptr) {
248     j=A->pattern->index[iptr];
249     val=A->val[iptr];
250     if(j!= i) {
251     if(val*val>=eps_Aii * diags[j]) {
252     Paso_IndexList_insertIndex(&(index_list[i]),j);
253     }
254     }
255     }
256     }
257     }
258    
259     out=Paso_IndexList_createPattern(0, A->pattern->numOutput,index_list,0,A->pattern->numInput,0);
260    
261     /* clean up */
262     if (index_list!=NULL) {
263     #pragma omp parallel for private(i) schedule(static)
264     for(i=0;i<A->pattern->numOutput;++i) Paso_IndexList_free(index_list[i].extension);
265     }
266    
267     TMPMEMFREE(index_list);
268     MEMFREE(diags);
269    
270     Paso_Pattern_mis(out,mis_marker);
271    
272    
273     }
274    
275    
276    
277    
278    
279 jfenwick 1851 #undef IS_AVAILABLE
280 artak 1975 #undef IS_IN_SET
281     #undef IS_REMOVED

  ViewVC Help
Powered by ViewVC 1.1.26