Chaste Commit::ca8ccdedf819b6e02855bc0e8e6f50bdecbc5208
PCBlockDiagonal.cpp
1/*
2
3Copyright (c) 2005-2024, University of Oxford.
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10This file is part of Chaste.
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12Redistribution and use in source and binary forms, with or without
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14 * Redistributions of source code must retain the above copyright notice,
15 this list of conditions and the following disclaimer.
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19 * Neither the name of the University of Oxford nor the names of its
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23THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
24AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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32OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33
34*/
35
36#include <iostream>
37
38#include "PetscVecTools.hpp" // Includes Ublas so must come first
39#include "PCBlockDiagonal.hpp"
40#include "Exception.hpp"
41#include "Warnings.hpp"
42
43#ifdef TRACE_KSP
44#include "Timer.hpp"
45#endif
46
48{
49#ifdef TRACE_KSP
50 mPCContext.mScatterTime = 0.0;
51 mPCContext.mA1PreconditionerTime = 0.0;
52 mPCContext.mA2PreconditionerTime = 0.0;
53 mPCContext.mGatherTime = 0.0;;
54#endif
55
56 PCBlockDiagonalCreate(rKspObject);
58}
59
60PCBlockDiagonal::~PCBlockDiagonal()
61{
62#ifdef TRACE_KSP
64 {
65 std::cout << " -- Block diagonal preconditioner profile information: " << std::endl;
66 std::cout << "\t mScatterTime: " << mPCContext.mScatterTime << std::endl;
67 std::cout << "\t mA1PreconditionerTime: " << mPCContext.mA1PreconditionerTime << std::endl;
68 std::cout << "\t mA2PreconditionerTime: " << mPCContext.mA2PreconditionerTime << std::endl;
69 std::cout << "\t mGatherTime: " << mPCContext.mGatherTime << std::endl;
70 }
71#endif
72
75
78
81
84
87}
88
90{
91 KSPGetPC(rKspObject, &mPetscPCObject);
92
93 Mat system_matrix, dummy;
94#if (PETSC_VERSION_MAJOR==3 && PETSC_VERSION_MINOR>=5)
95 KSPGetOperators(rKspObject, &system_matrix, &dummy);
96#else
97 MatStructure flag;
98 KSPGetOperators(rKspObject, &system_matrix, &dummy, &flag);
99#endif
100
101 PetscInt num_rows, num_columns;
102 MatGetSize(system_matrix, &num_rows, &num_columns);
103 assert(num_rows==num_columns);
104
105 PetscInt num_local_rows, num_local_columns;
106 MatGetLocalSize(system_matrix, &num_local_rows, &num_local_columns);
107
108 // Odd number of rows: impossible in Bidomain.
109 // Odd number of local rows: impossible if V_m and phi_e for each node are stored in the same processor.
110 if ((num_rows%2 != 0) || (num_local_rows%2 != 0))
111 {
112 TERMINATE("Wrong matrix parallel layout detected in PCBlockDiagonal."); // LCOV_EXCL_LINE
113 }
114
115 // Allocate memory
116 unsigned subvector_num_rows = num_rows/2;
117 unsigned subvector_local_rows = num_local_rows/2;
118 mPCContext.x1_subvector = PetscTools::CreateVec(subvector_num_rows, subvector_local_rows);
119 mPCContext.x2_subvector = PetscTools::CreateVec(subvector_num_rows, subvector_local_rows);
120 mPCContext.y1_subvector = PetscTools::CreateVec(subvector_num_rows, subvector_local_rows);
121 mPCContext.y2_subvector = PetscTools::CreateVec(subvector_num_rows, subvector_local_rows);
122
123 // Create scatter contexts
124 {
125 // Needed by SetupInterleavedVectorScatterGather in order to find out parallel layout.
126 Vec dummy_vec = PetscTools::CreateVec(num_rows, num_local_rows);
127
129
130 PetscTools::Destroy(dummy_vec);
131 }
132
133 // Get matrix sublock A11
134 {
135 // Work out local row range for subblock A11 (same as x1 or y1)
136 PetscInt low, high, global_size;
137 VecGetOwnershipRange(mPCContext.x1_subvector, &low, &high);
138 VecGetSize(mPCContext.x1_subvector, &global_size);
139 assert(global_size == num_rows/2);
140
141 IS A11_local_rows;
142 IS A11_columns;
143 ISCreateStride(PETSC_COMM_WORLD, high-low, 2*low, 2, &A11_local_rows);
144 ISCreateStride(PETSC_COMM_WORLD, global_size, 0, 2, &A11_columns);
145
146#if (PETSC_VERSION_MAJOR == 3 && PETSC_VERSION_MINOR >= 8) //PETSc 3.8 or later
147 MatCreateSubMatrix(system_matrix, A11_local_rows, A11_local_rows,
148 MAT_INITIAL_MATRIX, &mPCContext.A11_matrix_subblock);
149#else
150 MatGetSubMatrix(system_matrix, A11_local_rows, A11_local_rows,
151 MAT_INITIAL_MATRIX, &mPCContext.A11_matrix_subblock);
152#endif
153
154
155 ISDestroy(PETSC_DESTROY_PARAM(A11_local_rows));
156 ISDestroy(PETSC_DESTROY_PARAM(A11_columns));
157 }
158
159 // Get matrix sublock A22
160 {
161 // Work out local row range for subblock A22 (same as x2 or y2)
162 PetscInt low, high, global_size;
163 VecGetOwnershipRange(mPCContext.x2_subvector, &low, &high);
164 VecGetSize(mPCContext.x2_subvector, &global_size);
165 assert(global_size == num_rows/2);
166
167 IS A22_local_rows;
168 IS A22_columns;
169 ISCreateStride(PETSC_COMM_WORLD, high-low, 2*low+1, 2, &A22_local_rows);
170 ISCreateStride(PETSC_COMM_WORLD, global_size, 1, 2, &A22_columns);
171
172#if (PETSC_VERSION_MAJOR == 3 && PETSC_VERSION_MINOR >= 8) //PETSc 3.8 or later
173 MatCreateSubMatrix(system_matrix, A22_local_rows, A22_local_rows,
174 MAT_INITIAL_MATRIX, &mPCContext.A22_matrix_subblock);
175#else
176 MatGetSubMatrix(system_matrix, A22_local_rows, A22_local_rows,
177 MAT_INITIAL_MATRIX, &mPCContext.A22_matrix_subblock);
178#endif
179
180 ISDestroy(PETSC_DESTROY_PARAM(A22_local_rows));
181 ISDestroy(PETSC_DESTROY_PARAM(A22_columns));
182 }
183
184 // Register call-back function and its context
185 PCSetType(mPetscPCObject, PCSHELL);
186#if (PETSC_VERSION_MAJOR == 2 && PETSC_VERSION_MINOR == 2) //PETSc 2.2
187 PCShellSetApply(mPetscPCObject, PCBlockDiagonalApply, (void*) &mPCContext);
188#else
189 // Register PC context so it gets passed to PCBlockDiagonalApply
190 PCShellSetContext(mPetscPCObject, &mPCContext);
191
192 // Register call-back function
193 PCShellSetApply(mPetscPCObject, PCBlockDiagonalApply);
194#endif
195
196}
197
199{
200 // These options will get read by PCSetFromOptions
201// PetscTools::SetOption("-pc_hypre_boomeramg_max_iter", "1");
202// PetscTools::SetOption("-pc_hypre_boomeramg_strong_threshold", "0.0");
203// PetscTools::SetOption("-pc_hypre_type", "boomeramg");
204
205 // Set up amg preconditioner for block A11
206 PCCreate(PETSC_COMM_WORLD, &(mPCContext.PC_amg_A11));
207
208 // PCSetType(mPCContext.PC_amg_A11, PCBJACOBI);
209
210 // We are expecting an error from PETSC on systems that don't have the hypre library, so suppress it
211 // in case it aborts
212 PetscPushErrorHandler(PetscIgnoreErrorHandler, nullptr);
213 PetscErrorCode pc_set_error = PCSetType(mPCContext.PC_amg_A11, PCHYPRE);
214 if (pc_set_error != 0)
215 {
216 WARNING("PETSc hypre preconditioning library is not installed"); // LCOV_EXCL_LINE
217 }
218 // Stop supressing error
219 PetscPopErrorHandler();
220
221#if (PETSC_VERSION_MAJOR==3 && PETSC_VERSION_MINOR<=5)
222 PetscTools::SetOption("-pc_hypre_type", "euclid");
223 PetscTools::SetOption("-pc_hypre_euclid_levels", "0");
224#else
225/* euclid was removed in 3.6. Use the previously-commented-out alternative */
226 PetscTools::SetOption("-pc_hypre_type", "boomeramg");
227 PetscTools::SetOption("-pc_hypre_boomeramg_max_iter", "1");
228 PetscTools::SetOption("-pc_hypre_boomeramg_strong_threshold", "0.0");
229 PetscTools::SetOption("-pc_hypre_boomeramg_coarsen_type", "HMIS");
230#endif
231
232#if (PETSC_VERSION_MAJOR==3 && PETSC_VERSION_MINOR>=5)
233 // Attempt to emulate SAME_PRECONDITIONER below
234 PCSetReusePreconditioner(mPCContext.PC_amg_A11, PETSC_TRUE);
236#else
238#endif
239 PCSetFromOptions(mPCContext.PC_amg_A11);
240 PCSetUp(mPCContext.PC_amg_A11);
241
242 // Set up amg preconditioner for block A22
243 PCCreate(PETSC_COMM_WORLD, &(mPCContext.PC_amg_A22));
244
245 /* Full AMG in the block */
246 PetscPushErrorHandler(PetscIgnoreErrorHandler, nullptr);
247 PCSetType(mPCContext.PC_amg_A22, PCHYPRE);
248 // Stop supressing error
249 PetscPopErrorHandler();
250
251 //PCHYPRESetType(mPCContext.PC_amg_A22, "boomeramg");
252 PetscTools::SetOption("-pc_hypre_type", "boomeramg");
253 PetscTools::SetOption("-pc_hypre_boomeramg_max_iter", "1");
254 PetscTools::SetOption("-pc_hypre_boomeramg_strong_threshold", "0.0");
255 PetscTools::SetOption("-pc_hypre_boomeramg_coarsen_type", "HMIS");
256 //PetscTools::SetOption("-pc_hypre_boomeramg_relax_type_all","Jacobi");
257 //PetscTools::SetOption("-pc_hypre_boomeramg_max_levels","10");
258 //PetscTools::SetOption("-pc_hypre_boomeramg_agg_nl", "1");
259 //PetscTools::SetOption("-pc_hypre_boomeramg_print_statistics","");
260 //PetscTools::SetOption("-pc_hypre_boomeramg_interp_type","standard");
261 //PetscTools::SetOption("-pc_hypre_boomeramg_interp_type","ext+i");
262
263 // PCHYPRESetType(mPCContext.PC_amg_A22, "euclid");
264
265 /* Block Jacobi with AMG at each block */
266 // PCSetType(mPCContext.PC_amg_A22, PCBJACOBI);
267
268 // PetscTools::SetOption("-sub_pc_type", "hypre");
269
270 // PetscTools::SetOption("-sub_pc_hypre_type", "boomeramg");
271 // PetscTools::SetOption("-sub_pc_hypre_boomeramg_max_iter", "1");
272 // PetscTools::SetOption("-sub_pc_hypre_boomeramg_strong_threshold", "0.0");
273
274 // PetscTools::SetOption("-pc_hypre_type", "boomeramg");
275 // PetscTools::SetOption("-pc_hypre_boomeramg_max_iter", "1");
276 // PetscTools::SetOption("-pc_hypre_boomeramg_strong_threshold", "0.0");
277
278 /* Additive Schwarz with AMG at each block */
279// PCSetType(mPCContext.PC_amg_A22, PCASM);
280
281// PetscTools::SetOption("-pc_asm_type", "basic");
282// PetscTools::SetOption("-pc_asm_overlap", "1");
283
284// PetscTools::SetOption("-sub_ksp_type", "preonly");
285
286// PetscTools::SetOption("-sub_pc_type", "hypre");
287
288// PetscTools::SetOption("-sub_pc_hypre_type", "boomeramg");
289// PetscTools::SetOption("-sub_pc_hypre_boomeramg_max_iter", "1");
290// PetscTools::SetOption("-sub_pc_hypre_boomeramg_strong_threshold", "0.0");
291
292#if (PETSC_VERSION_MAJOR==3 && PETSC_VERSION_MINOR>=5)
293 // Attempt to emulate SAME_PRECONDITIONER below
294 PCSetReusePreconditioner(mPCContext.PC_amg_A22, PETSC_TRUE);
296#else
298#endif
299 PCSetFromOptions(mPCContext.PC_amg_A22);
300 PCSetUp(mPCContext.PC_amg_A22);
301}
302
303#if (PETSC_VERSION_MAJOR == 3 && PETSC_VERSION_MINOR >= 1) //PETSc 3.1 or later
304PetscErrorCode PCBlockDiagonalApply(PC pc_object, Vec x, Vec y)
305{
306 void* pc_context;
307
308 PCShellGetContext(pc_object, &pc_context);
309#else
310PetscErrorCode PCBlockDiagonalApply(void* pc_context, Vec x, Vec y)
311{
312#endif
313
314 // Cast the context pointer to PCBlockDiagonalContext
316 assert(block_diag_context!=nullptr);
317
318 /*
319 * Scatter x = [x1 x2]'
320 */
321#ifdef TRACE_KSP
322 Timer::Reset();
323#endif
324
325 PetscVecTools::DoInterleavedVecScatter(x, block_diag_context->A11_scatter_ctx, block_diag_context->x1_subvector, block_diag_context->A22_scatter_ctx, block_diag_context->x2_subvector);
326
327#ifdef TRACE_KSP
328 block_diag_context->mScatterTime += Timer::GetElapsedTime();
329#endif
330
331 /*
332 * y1 = AMG(A11)*x1
333 * y2 = AMG(A22)*x2
334 */
335#ifdef TRACE_KSP
336 Timer::Reset();
337#endif
338 PCApply(block_diag_context->PC_amg_A11, block_diag_context->x1_subvector, block_diag_context->y1_subvector);
339#ifdef TRACE_KSP
340 block_diag_context->mA1PreconditionerTime += Timer::GetElapsedTime();
341#endif
342
343#ifdef TRACE_KSP
344 Timer::Reset();
345#endif
346 PCApply(block_diag_context->PC_amg_A22, block_diag_context->x2_subvector, block_diag_context->y2_subvector);
347#ifdef TRACE_KSP
348 block_diag_context->mA2PreconditionerTime += Timer::GetElapsedTime();
349#endif
350
351 /*
352 * Gather y = [y1 y2]'
353 */
354//PETSc-3.x.x or PETSc-2.3.3
355#ifdef TRACE_KSP
356 Timer::Reset();
357#endif
358
359 PetscVecTools::DoInterleavedVecGather(y, block_diag_context->A11_scatter_ctx, block_diag_context->y1_subvector, block_diag_context->A22_scatter_ctx, block_diag_context->y2_subvector);
360
361#ifdef TRACE_KSP
362 block_diag_context->mGatherTime += Timer::GetElapsedTime();
363#endif
364 return 0;
365}
#define TERMINATE(message)
#define PETSC_DESTROY_PARAM(x)
void PCBlockDiagonalCreate(KSP &rKspObject)
PCBlockDiagonal(KSP &rKspObject)
PCBlockDiagonalContext mPCContext
static void Destroy(Vec &rVec)
static bool AmMaster()
static Vec CreateVec(int size, int localSize=PETSC_DECIDE, bool ignoreOffProcEntries=true)
static void SetOption(const char *pOptionName, const char *pOptionValue)
static void DoInterleavedVecScatter(Vec interleavedVec, VecScatter firstVariableScatterContext, Vec firstVariableVec, VecScatter secondVariableScatterContext, Vec secondVariableVec)
static void DoInterleavedVecGather(Vec interleavedVec, VecScatter firstVariableScatterContext, Vec firstVariableVec, VecScatter secondVariableScatterContext, Vec secondVariableVec)
static void SetupInterleavedVectorScatterGather(Vec interleavedVec, VecScatter &rFirstVariableScatterContext, VecScatter &rSecondVariableScatterContext)
static double GetElapsedTime()
Definition Timer.cpp:54
static void Reset()
Definition Timer.cpp:44