/[escript]/trunk/paso/src/Pattern_coupling.c
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Contents of /trunk/paso/src/Pattern_coupling.c

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Revision 1907 - (show annotations)
Wed Oct 22 11:41:18 2008 UTC (12 years ago) by phornby
File MIME type: text/plain
File size: 6472 byte(s)
Mesh_read.c - remove a debug printout introduced by me (oops).

Pattern_coupling.c - remove declaration of naib where it was not used, and remove naib frpm
omp pragmas where it was not declared, and not used.

Apparently cognac.ivec.org did not like this??


1
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 #include "mpi_C.h"
32 #include "Paso.h"
33 #include "PasoUtil.h"
34 #include "Pattern.h"
35 #include "Solver.h"
36
37
38 /***************************************************************/
39
40 #define IS_AVAILABLE -1
41 #define IS_IN_MIS_NOW -2
42 #define IS_IN_MIS -3
43 #define IS_CONNECTED_TO_MIS -4
44
45
46
47 void Paso_Pattern_coup(Paso_SparseMatrix* A, index_t* mis_marker) {
48
49 index_t index_offset=(A->pattern->type & PATTERN_FORMAT_OFFSET1 ? 1:0);
50 dim_t i,j;
51 double threshold=0.05;
52 index_t iptr,*index,*where_p,diagptr;
53 bool_t flag;
54 dim_t n=A->pattern->numOutput;
55 if (A->pattern->type & PATTERN_FORMAT_SYM) {
56 Paso_setError(TYPE_ERROR,"Paso_Pattern_mis: symmetric matrix pattern is not supported yet");
57 return;
58 }
59
60 /* is there any vertex available ?*/
61 while (Paso_Util_isAny(n,mis_marker,IS_AVAILABLE)) {
62
63 #pragma omp parallel for private(i,iptr,flag) schedule(static)
64 for (i=0;i<n;++i) {
65 if (mis_marker[i]==IS_AVAILABLE) {
66 flag=IS_IN_MIS;
67 diagptr=A->pattern->ptr[i];
68 index=&(A->pattern->index[diagptr]);
69 where_p=(index_t*)bsearch(&i,
70 index,
71 A->pattern->ptr[i + 1]-A->pattern->ptr[i],
72 sizeof(index_t),
73 Paso_comparIndex);
74 if (where_p==NULL) {
75 Paso_setError(VALUE_ERROR, "Paso_Solver_getAMG: main diagonal element missing.");
76 } else {
77 diagptr+=(index_t)(where_p-index);
78 }
79 for (iptr=A->pattern->ptr[i]-index_offset;iptr<A->pattern->ptr[i+1]-index_offset; ++iptr) {
80 j=A->pattern->index[iptr]-index_offset;
81 if (j!=i && A->val[iptr]>=threshold*A->val[diagptr]) {
82 flag=IS_AVAILABLE;
83 break;
84 }
85 }
86 mis_marker[i]=flag;
87 }
88 }
89
90 #pragma omp parallel for private(i,iptr) schedule(static)
91 for (i=0;i<n;i++) {
92 if (mis_marker[i]==IS_AVAILABLE) {
93 diagptr=A->pattern->ptr[i];
94 index=&(A->pattern->index[diagptr]);
95 where_p=(index_t*)bsearch(&i,
96 index,
97 A->pattern->ptr[i + 1]-A->pattern->ptr[i],
98 sizeof(index_t),
99 Paso_comparIndex);
100 if (where_p==NULL) {
101 Paso_setError(VALUE_ERROR, "Paso_Solver_getAMG: main diagonal element missing.");
102 } else {
103 diagptr+=(index_t)(where_p-index);
104 }
105 for (iptr=A->pattern->ptr[i]-index_offset;iptr<A->pattern->ptr[i+1]-index_offset; ++iptr) {
106 j=A->pattern->index[iptr]-index_offset;
107 if (j!=i && mis_marker[j]==IS_IN_MIS && (A->val[iptr]/A->val[diagptr])>=-threshold){
108 mis_marker[i]=IS_IN_MIS;
109 }
110 else {
111 mis_marker[i]=IS_CONNECTED_TO_MIS;
112 }
113 }
114 }
115 }
116 }
117 /* swap to TRUE/FALSE in mis_marker */
118 #pragma omp parallel for private(i) schedule(static)
119 for (i=0;i<n;i++) mis_marker[i]=(mis_marker[i]==IS_IN_MIS);
120 }
121
122 /*
123 *
124 * Return a strength of connection mask using the classical
125 * strength of connection measure by Ruge and Stuben.
126 *
127 * Specifically, an off-diagonal entry A[i.j] is a strong
128 * connection if:
129 *
130 * -A[i,j] >= theta * max( -A[i,k] ) where k != i
131 *
132 * Otherwise, the connection is weak.
133 *
134 */
135 void Paso_Pattern_RS(Paso_SparseMatrix* A, index_t* mis_marker, double theta)
136 {
137 index_t index_offset=(A->pattern->type & PATTERN_FORMAT_OFFSET1 ? 1:0);
138 dim_t i,j;
139 index_t iptr;
140 double threshold,min_offdiagonal;
141 bool_t flag;
142 dim_t n=A->pattern->numOutput;
143 if (A->pattern->type & PATTERN_FORMAT_SYM) {
144 Paso_setError(TYPE_ERROR,"Paso_Pattern_RS: symmetric matrix pattern is not supported yet");
145 return;
146 }
147
148 /* is there any vertex available ?*/
149 if (Paso_Util_isAny(n,mis_marker,IS_AVAILABLE)) {
150
151 #pragma omp parallel for private(i,iptr,min_offdiagonal,threshold) schedule(static)
152 for (i=0;i<n;++i) {
153 min_offdiagonal = A->val[A->pattern->ptr[i]-index_offset];
154 for (iptr=A->pattern->ptr[i]-index_offset;iptr<A->pattern->ptr[i+1]-index_offset; ++iptr) {
155 if(A->pattern->index[iptr] != i){
156 min_offdiagonal = MIN(min_offdiagonal,A->val[iptr-index_offset]);
157 }
158 }
159
160 threshold = theta*min_offdiagonal;
161 mis_marker[i]=IS_CONNECTED_TO_MIS;
162 #pragma omp parallel for private(iptr) schedule(static)
163 for (iptr=A->pattern->ptr[i]-index_offset;iptr<A->pattern->ptr[i+1]-index_offset; ++iptr) {
164 if(-1.*(A->val[iptr-index_offset]) <= threshold){
165 mis_marker[i]=IS_IN_MIS;
166 }
167 }
168 }
169 }
170 /* swap to TRUE/FALSE in mis_marker */
171 #pragma omp parallel for private(i) schedule(static)
172 for (i=0;i<n;i++) mis_marker[i]=(mis_marker[i]==IS_IN_MIS);
173 }
174 #undef IS_AVAILABLE
175 #undef IS_IN_MIS_NOW
176 #undef IS_IN_MIS
177 #undef IS_CONNECTED_TO_MIS

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