Actual source code: saviennacl.cxx
petsc-3.13.6 2020-09-29
2: /* -------------------------------------------------------------------- */
4: /*
5: Include files needed for the ViennaCL Smoothed Aggregation preconditioner:
6: pcimpl.h - private include file intended for use by all preconditioners
7: */
8: #define PETSC_SKIP_SPINLOCK
9: #define PETSC_SKIP_IMMINTRIN_H_CUDAWORKAROUND 1
10: #include <petsc/private/pcimpl.h>
11: #include <../src/mat/impls/aij/seq/aij.h>
12: #include <../src/vec/vec/impls/dvecimpl.h>
13: #include <../src/mat/impls/aij/seq/seqviennacl/viennaclmatimpl.h>
14: #include <../src/vec/vec/impls/seq/seqviennacl/viennaclvecimpl.h>
15: #include <viennacl/linalg/amg.hpp>
17: /*
18: Private context (data structure) for the SAVIENNACL preconditioner.
19: */
20: typedef struct {
21: viennacl::linalg::amg_precond<viennacl::compressed_matrix<PetscScalar> > *SAVIENNACL;
22: } PC_SAVIENNACL;
25: /* -------------------------------------------------------------------------- */
26: /*
27: PCSetUp_SAVIENNACL - Prepares for the use of the SAVIENNACL preconditioner
28: by setting data structures and options.
30: Input Parameter:
31: . pc - the preconditioner context
33: Application Interface Routine: PCSetUp()
35: Notes:
36: The interface routine PCSetUp() is not usually called directly by
37: the user, but instead is called by PCApply() if necessary.
38: */
39: static PetscErrorCode PCSetUp_SAVIENNACL(PC pc)
40: {
41: PC_SAVIENNACL *sa = (PC_SAVIENNACL*)pc->data;
42: PetscBool flg = PETSC_FALSE;
43: PetscErrorCode ierr;
44: Mat_SeqAIJViennaCL *gpustruct;
47: PetscObjectTypeCompare((PetscObject)pc->pmat,MATSEQAIJVIENNACL,&flg);
48: if (!flg) SETERRQ(PetscObjectComm((PetscObject)pc),PETSC_ERR_SUP,"Currently only handles ViennaCL matrices");
49: if (pc->setupcalled != 0) {
50: try {
51: delete sa->SAVIENNACL;
52: } catch(char *ex) {
53: SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_LIB,"ViennaCL error: %s", ex);
54: }
55: }
56: try {
57: #if defined(PETSC_USE_COMPLEX)
58: gpustruct = NULL;
59: SETERRQ(PetscObjectComm((PetscObject)pc),PETSC_ERR_SUP,"No support for complex arithmetic in SAVIENNACL preconditioner");
60: #else
61: MatViennaCLCopyToGPU(pc->pmat);
62: gpustruct = (Mat_SeqAIJViennaCL*)(pc->pmat->spptr);
63:
64: viennacl::linalg::amg_tag amg_tag_sa_pmis;
65: amg_tag_sa_pmis.set_coarsening_method(viennacl::linalg::AMG_COARSENING_METHOD_MIS2_AGGREGATION);
66: amg_tag_sa_pmis.set_interpolation_method(viennacl::linalg::AMG_INTERPOLATION_METHOD_SMOOTHED_AGGREGATION);
67: ViennaCLAIJMatrix *mat = (ViennaCLAIJMatrix*)gpustruct->mat;
68: sa->SAVIENNACL = new viennacl::linalg::amg_precond<viennacl::compressed_matrix<PetscScalar> >(*mat, amg_tag_sa_pmis);
69: sa->SAVIENNACL->setup();
70: #endif
71: } catch(char *ex) {
72: SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_LIB,"ViennaCL error: %s", ex);
73: }
74: return(0);
75: }
77: /* -------------------------------------------------------------------------- */
78: /*
79: PCApply_SAVIENNACL - Applies the SAVIENNACL preconditioner to a vector.
81: Input Parameters:
82: . pc - the preconditioner context
83: . x - input vector
85: Output Parameter:
86: . y - output vector
88: Application Interface Routine: PCApply()
89: */
90: static PetscErrorCode PCApply_SAVIENNACL(PC pc,Vec x,Vec y)
91: {
92: PC_SAVIENNACL *sac = (PC_SAVIENNACL*)pc->data;
93: PetscErrorCode ierr;
94: PetscBool flg1,flg2;
95: viennacl::vector<PetscScalar> const *xarray=NULL;
96: viennacl::vector<PetscScalar> *yarray=NULL;
99: /*how to apply a certain fixed number of iterations?*/
100: PetscObjectTypeCompare((PetscObject)x,VECSEQVIENNACL,&flg1);
101: PetscObjectTypeCompare((PetscObject)y,VECSEQVIENNACL,&flg2);
102: if (!(flg1 && flg2)) SETERRQ(PetscObjectComm((PetscObject)pc),PETSC_ERR_SUP, "Currently only handles ViennaCL vectors");
103: if (!sac->SAVIENNACL) {
104: PCSetUp_SAVIENNACL(pc);
105: }
106: VecViennaCLGetArrayRead(x,&xarray);
107: VecViennaCLGetArrayWrite(y,&yarray);
108: try {
109: #if !defined(PETSC_USE_COMPLEX)
110: *yarray = *xarray;
111: sac->SAVIENNACL->apply(*yarray);
112: #endif
113: } catch(char * ex) {
114: SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_LIB,"ViennaCL error: %s", ex);
115: }
116: VecViennaCLRestoreArrayRead(x,&xarray);
117: VecViennaCLRestoreArrayWrite(y,&yarray);
118: PetscObjectStateIncrease((PetscObject)y);
119: return(0);
120: }
121: /* -------------------------------------------------------------------------- */
122: /*
123: PCDestroy_SAVIENNACL - Destroys the private context for the SAVIENNACL preconditioner
124: that was created with PCCreate_SAVIENNACL().
126: Input Parameter:
127: . pc - the preconditioner context
129: Application Interface Routine: PCDestroy()
130: */
131: static PetscErrorCode PCDestroy_SAVIENNACL(PC pc)
132: {
133: PC_SAVIENNACL *sac = (PC_SAVIENNACL*)pc->data;
137: if (sac->SAVIENNACL) {
138: try {
139: delete sac->SAVIENNACL;
140: } catch(char * ex) {
141: SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_LIB,"ViennaCL error: %s", ex);
142: }
143: }
145: /*
146: Free the private data structure that was hanging off the PC
147: */
148: PetscFree(pc->data);
149: return(0);
150: }
152: static PetscErrorCode PCSetFromOptions_SAVIENNACL(PetscOptionItems *PetscOptionsObject,PC pc)
153: {
157: PetscOptionsHead(PetscOptionsObject,"SAVIENNACL options");
158: PetscOptionsTail();
159: return(0);
160: }
162: /* -------------------------------------------------------------------------- */
165: /*MC
166: PCSAViennaCL - A smoothed agglomeration algorithm that can be used via the CUDA, OpenCL, and OpenMP backends of ViennaCL
168: Level: advanced
170: .seealso: PCCreate(), PCSetType(), PCType (for list of available types), PC
172: M*/
174: PETSC_EXTERN PetscErrorCode PCCreate_SAVIENNACL(PC pc)
175: {
176: PC_SAVIENNACL *sac;
180: /*
181: Creates the private data structure for this preconditioner and
182: attach it to the PC object.
183: */
184: PetscNewLog(pc,&sac);
185: pc->data = (void*)sac;
187: /*
188: Initialize the pointer to zero
189: Initialize number of v-cycles to default (1)
190: */
191: sac->SAVIENNACL = 0;
193: /*
194: Set the pointers for the functions that are provided above.
195: Now when the user-level routines (such as PCApply(), PCDestroy(), etc.)
196: are called, they will automatically call these functions. Note we
197: choose not to provide a couple of these functions since they are
198: not needed.
199: */
200: pc->ops->apply = PCApply_SAVIENNACL;
201: pc->ops->applytranspose = 0;
202: pc->ops->setup = PCSetUp_SAVIENNACL;
203: pc->ops->destroy = PCDestroy_SAVIENNACL;
204: pc->ops->setfromoptions = PCSetFromOptions_SAVIENNACL;
205: pc->ops->view = 0;
206: pc->ops->applyrichardson = 0;
207: pc->ops->applysymmetricleft = 0;
208: pc->ops->applysymmetricright = 0;
209: return(0);
210: }