/[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 2555 - (hide annotations)
Mon Jul 27 01:50:16 2009 UTC (10 years, 6 months ago) by artak
File MIME type: text/plain
File size: 12205 byte(s)
Pattern_free for Aggregiation coarsening is added.
1 jfenwick 1851
2     /*******************************************************
3     *
4 jfenwick 2548 * Copyright (c) 2003-2009 by University of Queensland
5 jfenwick 1851 * 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 artak 2475 #pragma omp parallel for private(i,iptr,min_offdiagonal,threshold,j) schedule(static)
166 artak 2381 for (i=0;i<n;++i) {
167     if(mis_marker[i]==IS_AVAILABLE) {
168     min_offdiagonal = DBL_MAX;
169     for (iptr=A->pattern->ptr[i];iptr<A->pattern->ptr[i+1]; ++iptr) {
170     if(A->pattern->index[iptr] != i){
171     min_offdiagonal = MIN(min_offdiagonal,A->val[iptr]);
172     }
173     }
174 artak 2475
175 artak 2381 threshold = theta*min_offdiagonal;
176     for (iptr=A->pattern->ptr[i];iptr<A->pattern->ptr[i+1]; ++iptr) {
177     j=A->pattern->index[iptr];
178     if(A->val[iptr]<=threshold) {
179     if(j!=i) {
180     Paso_IndexList_insertIndex(&(index_list[i]),j);
181 artak 2552 /*Paso_IndexList_insertIndex(&(index_list[j]),i);*/
182 artak 2381 }
183     }
184     }
185     }
186     }
187    
188 artak 2475
189 artak 2381 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 artak 2450 /*Paso_Pattern_mis(out,mis_marker);*/
199     Paso_Pattern_greedy(out,mis_marker);
200 gross 2551 Paso_Pattern_free(out);
201 artak 2381 }
202    
203     void Paso_Pattern_Aggregiation(Paso_SparseMatrix* A, index_t* mis_marker, double theta)
204     {
205     dim_t i,j,n;
206     index_t iptr;
207     double diag,eps_Aii,val;
208     double* diags;
209    
210    
211     Paso_Pattern *out=NULL;
212     Paso_IndexList* index_list=NULL;
213    
214     n=A->numRows;
215     diags=MEMALLOC(n,double);
216    
217     index_list=TMPMEMALLOC(A->pattern->numOutput,Paso_IndexList);
218     if (! Paso_checkPtr(index_list)) {
219     #pragma omp parallel for private(i) schedule(static)
220     for(i=0;i<A->pattern->numOutput;++i) {
221     index_list[i].extension=NULL;
222     index_list[i].n=0;
223     }
224     }
225    
226     if (A->pattern->type & PATTERN_FORMAT_SYM) {
227 artak 2447 Paso_setError(TYPE_ERROR,"Paso_Pattern_Aggregiation: symmetric matrix pattern is not supported yet");
228 artak 2381 return;
229     }
230    
231    
232 artak 2552 #pragma omp parallel for private(i,iptr,diag) schedule(static)
233 artak 2381 for (i=0;i<n;++i) {
234     diag = 0;
235     for (iptr=A->pattern->ptr[i];iptr<A->pattern->ptr[i+1]; ++iptr) {
236 artak 2447 if(A->pattern->index[iptr] == i){
237 artak 2381 diag+=A->val[iptr];
238     }
239     }
240     diags[i]=ABS(diag);
241     }
242    
243    
244     #pragma omp parallel for private(i,iptr,j,val,eps_Aii) schedule(static)
245     for (i=0;i<n;++i) {
246     if (mis_marker[i]==IS_AVAILABLE) {
247     eps_Aii = theta*theta*diags[i];
248     val=0.;
249     for (iptr=A->pattern->ptr[i];iptr<A->pattern->ptr[i+1]; ++iptr) {
250     j=A->pattern->index[iptr];
251     val=A->val[iptr];
252     if(j!= i) {
253     if(val*val>=eps_Aii * diags[j]) {
254     Paso_IndexList_insertIndex(&(index_list[i]),j);
255     }
256     }
257     }
258     }
259     }
260    
261     out=Paso_IndexList_createPattern(0, A->pattern->numOutput,index_list,0,A->pattern->numInput,0);
262    
263     /* clean up */
264     if (index_list!=NULL) {
265     #pragma omp parallel for private(i) schedule(static)
266     for(i=0;i<A->pattern->numOutput;++i) Paso_IndexList_free(index_list[i].extension);
267     }
268    
269     TMPMEMFREE(index_list);
270     MEMFREE(diags);
271    
272 artak 2475
273 artak 2450 /*Paso_Pattern_mis(out,mis_marker);*/
274     Paso_Pattern_greedy(out,mis_marker);
275 artak 2555 Paso_Pattern_free(out);
276 artak 2381
277 artak 2450 }
278 artak 2381
279 artak 2450 /* Greedy algorithm */
280     void Paso_Pattern_greedy(Paso_Pattern* pattern, index_t* mis_marker) {
281    
282     dim_t i,j;
283     /*double sum;*/
284     index_t iptr;
285     bool_t passed=FALSE;
286     dim_t n=pattern->numOutput;
287    
288     if (pattern->type & PATTERN_FORMAT_SYM) {
289     Paso_setError(TYPE_ERROR,"Paso_Pattern_greedy: symmetric matrix pattern is not supported yet");
290     return;
291     }
292    
293 artak 2475 /* We do not need this loop if we set IS_IN_MIS=IS_AVAILABLE. */
294 artak 2450 #pragma omp parallel for private(i) schedule(static)
295     for (i=0;i<n;++i)
296     if(mis_marker[i]==IS_AVAILABLE)
297     mis_marker[i]=IS_IN_SET;
298    
299    
300     for (i=0;i<n;++i) {
301     if (mis_marker[i]==IS_IN_SET) {
302     for (iptr=pattern->ptr[i];iptr<pattern->ptr[i+1]; ++iptr) {
303     j=pattern->index[iptr];
304     mis_marker[j]=IS_REMOVED;
305     }
306     }
307     }
308    
309    
310    
311     for (i=0;i<n;i++) {
312     if (mis_marker[i]==IS_REMOVED) {
313     passed=TRUE;
314     for (iptr=pattern->ptr[i];iptr<pattern->ptr[i+1]; ++iptr) {
315     j=pattern->index[iptr];
316     if (mis_marker[j]==IS_REMOVED) {
317     passed=TRUE;
318     }
319     else {
320     passed=FALSE;
321     break;
322     }
323     }
324     }
325     if (passed) mis_marker[i]=IS_IN_SET;
326     }
327    
328     /* swap to TRUE/FALSE in mis_marker */
329     #pragma omp parallel for private(i) schedule(static)
330     for (i=0;i<n;i++) mis_marker[i]=(mis_marker[i]!=IS_IN_SET);
331    
332 artak 2381 }
333    
334    
335 artak 2475 void Paso_Pattern_greedy_color(Paso_Pattern* pattern, index_t* mis_marker) {
336 artak 2381
337 artak 2475 dim_t i,j;
338     /*double sum;*/
339     index_t iptr;
340     index_t num_colors;
341     index_t* colorOf;
342     register index_t color;
343     bool_t passed=FALSE;
344     dim_t n=pattern->numOutput;
345 artak 2381
346 artak 2475
347     colorOf=MEMALLOC(n,index_t);
348    
349     if (pattern->type & PATTERN_FORMAT_SYM) {
350     Paso_setError(TYPE_ERROR,"Paso_Pattern_greedy: symmetric matrix pattern is not supported yet");
351     return;
352     }
353    
354     Paso_Pattern_color(pattern,&num_colors,colorOf);
355    
356     /* We do not need this loop if we set IS_IN_MIS=IS_AVAILABLE. */
357     #pragma omp parallel for private(i) schedule(static)
358     for (i=0;i<n;++i)
359     if(mis_marker[i]==IS_AVAILABLE)
360     mis_marker[i]=IS_IN_SET;
361    
362     #pragma omp barrier
363     for (color=0;color<num_colors;++color) {
364     #pragma omp parallel for schedule(static) private(i,iptr,j)
365     for (i=0;i<n;++i) {
366     if (colorOf[i]==color) {
367     if (mis_marker[i]==IS_IN_SET) {
368     for (iptr=pattern->ptr[i];iptr<pattern->ptr[i+1]; ++iptr) {
369     j=pattern->index[iptr];
370     if (colorOf[j]<color)
371     mis_marker[j]=IS_REMOVED;
372     }
373     }
374     }
375     }
376     }
377    
378    
379     #pragma omp barrier
380     for (color=0;color<num_colors;++color) {
381     #pragma omp parallel for schedule(static) private(i,iptr,j)
382     for (i=0;i<n;i++) {
383     if (colorOf[i]==color) {
384     if (mis_marker[i]==IS_REMOVED) {
385     passed=TRUE;
386     for (iptr=pattern->ptr[i];iptr<pattern->ptr[i+1]; ++iptr) {
387     j=pattern->index[iptr];
388     if (colorOf[j]<color && passed) {
389     if (mis_marker[j]==IS_REMOVED) {
390     passed=TRUE;
391     }
392     else {
393     passed=FALSE;
394     /*break;*/
395     }
396     }
397     }
398     }
399     if (passed) mis_marker[i]=IS_IN_SET;
400     }
401     }
402     }
403    
404     /* swap to TRUE/FALSE in mis_marker */
405     #pragma omp parallel for private(i) schedule(static)
406     for (i=0;i<n;i++) mis_marker[i]=(mis_marker[i]!=IS_IN_SET);
407    
408     MEMFREE(colorOf);
409     }
410    
411    
412    
413 jfenwick 1851 #undef IS_AVAILABLE
414 artak 1975 #undef IS_IN_SET
415     #undef IS_REMOVED

  ViewVC Help
Powered by ViewVC 1.1.26