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/******************************************************* |
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* |
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* Copyright (c) 2003-2008 by University of Queensland |
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* Earth Systems Science Computational Center (ESSCC) |
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* http://www.uq.edu.au/esscc |
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* |
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* Primary Business: Queensland, Australia |
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* Licensed under the Open Software License version 3.0 |
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* http://www.opensource.org/licenses/osl-3.0.php |
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* |
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*******************************************************/ |
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|
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|
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/**************************************************************/ |
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|
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/* Paso: AMG preconditioner with reordering */ |
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|
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/**************************************************************/ |
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|
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/* Author: artak@access.edu.au */ |
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|
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/**************************************************************/ |
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|
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#include "Paso.h" |
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#include "Solver.h" |
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#include "PasoUtil.h" |
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#include "UMFPACK.h" |
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#include "Pattern_coupling.h" |
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|
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/**************************************************************/ |
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|
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/* free all memory used by AMG */ |
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|
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void Paso_Solver_AMG_free(Paso_Solver_AMG * in) { |
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if (in!=NULL) { |
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Paso_Solver_AMG_free(in->AMG_of_Schur); |
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Paso_Solver_GS_free(in->GS); |
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MEMFREE(in->inv_A_FF); |
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MEMFREE(in->A_FF_pivot); |
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Paso_SparseMatrix_free(in->A_FC); |
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Paso_SparseMatrix_free(in->A_CF); |
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MEMFREE(in->rows_in_F); |
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MEMFREE(in->rows_in_C); |
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MEMFREE(in->mask_F); |
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MEMFREE(in->mask_C); |
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MEMFREE(in->x_F); |
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MEMFREE(in->b_F); |
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MEMFREE(in->x_C); |
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MEMFREE(in->b_C); |
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MEMFREE(in); |
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} |
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} |
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|
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/**************************************************************/ |
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|
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/* constructs the block-block factorization of |
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|
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[ A_FF A_FC ] |
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A_p= |
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[ A_CF A_FF ] |
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|
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to |
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|
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[ I 0 ] [ A_FF 0 ] [ I invA_FF*A_FF ] |
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[ A_CF*invA_FF I ] [ 0 S ] [ 0 I ] |
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|
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|
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where S=A_FF-ACF*invA_FF*A_FC within the shape of S |
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|
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then AMG is applied to S again until S becomes empty |
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|
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*/ |
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Paso_Solver_AMG* Paso_Solver_getAMG(Paso_SparseMatrix *A_p,bool_t verbose,dim_t level) { |
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Paso_Solver_AMG* out=NULL; |
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dim_t n=A_p->numRows; |
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dim_t n_block=A_p->row_block_size; |
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index_t* mis_marker=NULL; |
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index_t* counter=NULL; |
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index_t iPtr,*index, *where_p, iPtr_s; |
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dim_t i,k,j,j0; |
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Paso_SparseMatrix * schur=NULL; |
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Paso_SparseMatrix * schur_withFillIn=NULL; |
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double time0,time1,time2,S; |
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|
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/* identify independend set of rows/columns */ |
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mis_marker=TMPMEMALLOC(n,index_t); |
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counter=TMPMEMALLOC(n,index_t); |
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out=MEMALLOC(1,Paso_Solver_AMG); |
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out->AMG_of_Schur=NULL; |
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out->inv_A_FF=NULL; |
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out->A_FF_pivot=NULL; |
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out->A_FC=NULL; |
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out->A_CF=NULL; |
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out->rows_in_F=NULL; |
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out->rows_in_C=NULL; |
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out->mask_F=NULL; |
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out->mask_C=NULL; |
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out->x_F=NULL; |
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out->b_F=NULL; |
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out->x_C=NULL; |
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out->b_C=NULL; |
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out->A=Paso_SparseMatrix_getReference(A_p); |
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out->GS=Paso_Solver_getGS(A_p,verbose); |
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out->GS->sweeps=2; |
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out->level=level; |
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|
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if ( !(Paso_checkPtr(mis_marker) || Paso_checkPtr(out) || Paso_checkPtr(counter) ) ) { |
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/* identify independend set of rows/columns */ |
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time0=Paso_timer(); |
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#pragma omp parallel for private(i) schedule(static) |
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for (i=0;i<n;++i) mis_marker[i]=-1; |
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Paso_Pattern_RS(A_p,mis_marker,1/n); |
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/*Paso_Pattern_coup(A_p,mis_marker,1/n);*/ |
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time2=Paso_timer()-time0; |
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if (Paso_noError()) { |
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#pragma omp parallel for private(i) schedule(static) |
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for (i = 0; i < n; ++i) counter[i]=mis_marker[i]; |
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out->n=n; |
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out->n_block=n_block; |
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out->n_F=Paso_Util_cumsum(n,counter); |
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out->mask_F=MEMALLOC(n,index_t); |
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out->rows_in_F=MEMALLOC(out->n_F,index_t); |
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out->inv_A_FF=MEMALLOC(n_block*n_block*out->n_F,double); |
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out->A_FF_pivot=NULL; /* later use for block size>3 */ |
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if (! (Paso_checkPtr(out->mask_F) || Paso_checkPtr(out->inv_A_FF) || Paso_checkPtr(out->rows_in_F) ) ) { |
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#pragma omp parallel |
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{ |
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/* creates an index for F from mask */ |
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#pragma omp for private(i) schedule(static) |
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for (i = 0; i < out->n_F; ++i) out->rows_in_F[i]=-1; |
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#pragma omp for private(i) schedule(static) |
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for (i = 0; i < n; ++i) { |
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if (mis_marker[i]) { |
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out->rows_in_F[counter[i]]=i; |
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out->mask_F[i]=counter[i]; |
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} else { |
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out->mask_F[i]=-1; |
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} |
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} |
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/* Compute row-sum for getting rs(A_FF)*/ |
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#pragma omp for private(i,iPtr) schedule(static) |
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for (i = 0; i < out->n_F; ++i) { |
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out->inv_A_FF[i]=0; |
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for (iPtr=A_p->pattern->ptr[out->rows_in_F[i]];iPtr<A_p->pattern->ptr[out->rows_in_F[i] + 1]; ++iPtr) { |
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out->inv_A_FF[i]+=A_p->val[iPtr]; |
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} |
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} |
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|
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#pragma omp for private(i, where_p,iPtr,index) schedule(static) |
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for (i = 0; i < out->n_F; i++) { |
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/* find main diagonal */ |
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iPtr=A_p->pattern->ptr[out->rows_in_F[i]]; |
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index=&(A_p->pattern->index[iPtr]); |
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where_p=(index_t*)bsearch(&out->rows_in_F[i], |
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index, |
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A_p->pattern->ptr[out->rows_in_F[i] + 1]-A_p->pattern->ptr[out->rows_in_F[i]], |
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sizeof(index_t), |
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Paso_comparIndex); |
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if (where_p==NULL) { |
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Paso_setError(VALUE_ERROR, "Paso_Solver_getAMG: main diagonal element missing."); |
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} else { |
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iPtr+=(index_t)(where_p-index); |
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/* get inverse of A_FF block: */ |
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S=out->inv_A_FF[i]; |
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if (ABS(A_p->val[iPtr])>0.) { |
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if(ABS(S)>0.) |
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out->inv_A_FF[i]=1./S; |
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/* else |
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{ |
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fprintf(stderr,"ROWSUM OF ROW %d is 0\n",out->rows_in_F[i]); |
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S=0; |
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for (iPtr=A_p->pattern->ptr[out->rows_in_F[i]];iPtr<A_p->pattern->ptr[out->rows_in_F[i] + 1]; ++iPtr) { |
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if(A_p->val[iPtr]!=0) { |
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fprintf(stderr,"A_p[%d,%d]=%f ",out->rows_in_F[i],A_p->pattern->index[iPtr],A_p->val[iPtr]); |
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S+=A_p->val[iPtr]; |
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} |
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} |
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fprintf(stderr,"\n SUMMMMMMM %f\n",S); |
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} |
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*/ } else { |
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Paso_setError(ZERO_DIVISION_ERROR, "Paso_Solver_getAMG: Break-down in AMG decomposition: non-regular main diagonal block."); |
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} |
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} |
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} |
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} /* end parallel region */ |
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|
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if( Paso_noError()) { |
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/* if there are no nodes in the coarse level there is no more work to do */ |
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out->n_C=n-out->n_F; |
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/*if (level>0) {*/ |
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if (out->n_C>10) { |
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out->rows_in_C=MEMALLOC(out->n_C,index_t); |
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out->mask_C=MEMALLOC(n,index_t); |
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if (! (Paso_checkPtr(out->mask_C) || Paso_checkPtr(out->rows_in_C) ) ) { |
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/* creates an index for C from mask */ |
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#pragma omp parallel for private(i) schedule(static) |
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for (i = 0; i < n; ++i) counter[i]=! mis_marker[i]; |
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Paso_Util_cumsum(n,counter); |
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#pragma omp parallel |
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{ |
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#pragma omp for private(i) schedule(static) |
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for (i = 0; i < out->n_C; ++i) out->rows_in_C[i]=-1; |
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#pragma omp for private(i) schedule(static) |
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for (i = 0; i < n; ++i) { |
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if (! mis_marker[i]) { |
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out->rows_in_C[counter[i]]=i; |
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out->mask_C[i]=counter[i]; |
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} else { |
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out->mask_C[i]=-1; |
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} |
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} |
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} /* end parallel region */ |
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/* get A_CF block: */ |
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out->A_CF=Paso_SparseMatrix_getSubmatrix(A_p,out->n_C,out->n_F,out->rows_in_C,out->mask_F); |
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if (Paso_noError()) { |
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/* get A_FC block: */ |
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out->A_FC=Paso_SparseMatrix_getSubmatrix(A_p,out->n_F,out->n_C,out->rows_in_F,out->mask_C); |
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/* get A_CC block: */ |
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if (Paso_noError()) { |
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schur=Paso_SparseMatrix_getSubmatrix(A_p,out->n_C,out->n_C,out->rows_in_C,out->mask_C); |
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|
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/*find the pattern of the schur complement with fill in*/ |
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schur_withFillIn=Paso_SparseMatrix_alloc(A_p->type,Paso_Pattern_binop(PATTERN_FORMAT_DEFAULT, schur->pattern, Paso_Pattern_multiply(PATTERN_FORMAT_DEFAULT,out->A_CF->pattern,out->A_FC->pattern)),1,1); |
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|
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/* copy values over*/ |
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#pragma omp for private(i,iPtr,iPtr_s,j,j0) schedule(static) |
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for (i = 0; i < schur_withFillIn->numRows; ++i) { |
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for (iPtr=schur_withFillIn->pattern->ptr[i];iPtr<schur_withFillIn->pattern->ptr[i + 1]; ++iPtr) { |
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j=schur_withFillIn->pattern->index[iPtr]; |
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schur_withFillIn->val[iPtr]=0.; |
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for (iPtr_s=schur->pattern->ptr[i];iPtr_s<schur->pattern->ptr[i + 1]; ++iPtr_s){ |
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j0=schur->pattern->index[iPtr_s]; |
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if (j==j0) { |
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schur_withFillIn->val[iPtr]=schur->val[iPtr_s]; |
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break; |
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} |
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} |
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} |
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} |
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time0=Paso_timer()-time0; |
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|
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if (Paso_noError()) { |
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time1=Paso_timer(); |
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/* update A_CC block to get Schur complement and then apply AMG to it */ |
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Paso_Solver_updateIncompleteSchurComplement(schur_withFillIn,out->A_CF,out->inv_A_FF,out->A_FF_pivot,out->A_FC); |
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time1=Paso_timer()-time1; |
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out->AMG_of_Schur=Paso_Solver_getAMG(schur_withFillIn,verbose,level+1); |
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|
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/*Paso_SparseMatrix_free(schur);*/ |
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/* Paso_SparseMatrix_free(schur_withFillIn);*/ |
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} |
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/* allocate work arrays for AMG application */ |
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if (Paso_noError()) { |
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out->x_F=MEMALLOC(n_block*out->n_F,double); |
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out->b_F=MEMALLOC(n_block*out->n_F,double); |
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out->x_C=MEMALLOC(n_block*out->n_C,double); |
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out->b_C=MEMALLOC(n_block*out->n_C,double); |
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|
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if (! (Paso_checkPtr(out->x_F) || Paso_checkPtr(out->b_F) || Paso_checkPtr(out->x_C) || Paso_checkPtr(out->b_C) ) ) { |
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#pragma omp parallel |
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{ |
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#pragma omp for private(i,k) schedule(static) |
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for (i = 0; i < out->n_F; ++i) { |
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for (k=0; k<n_block;++k) { |
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out->x_F[i*n_block+k]=0.; |
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out->b_F[i*n_block+k]=0.; |
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} |
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} |
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#pragma omp for private(i,k) schedule(static) |
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for (i = 0; i < out->n_C; ++i) { |
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for (k=0; k<n_block;++k) { |
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out->x_C[i*n_block+k]=0.; |
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out->b_C[i*n_block+k]=0.; |
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} |
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} |
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} /* end parallel region */ |
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} |
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} |
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} |
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} |
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} |
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} |
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} |
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} |
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} |
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} |
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TMPMEMFREE(mis_marker); |
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TMPMEMFREE(counter); |
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if (Paso_noError()) { |
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if (verbose) { |
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printf("AMG: %d unknowns eliminated. %d left.\n",out->n_F,n-out->n_F); |
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if (out->n_C>0) { |
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printf("timing: AMG: MIS/reordering/elemination : %e/%e/%e\n",time2,time0,time1); |
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} else { |
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printf("timing: AMG: MIS: %e\n",time2); |
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} |
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} |
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return out; |
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} else { |
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Paso_Solver_AMG_free(out); |
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return NULL; |
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} |
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} |
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|
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/**************************************************************/ |
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|
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/* apply AMG precondition b-> x |
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|
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in fact it solves |
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|
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[ I 0 ] [ A_FF 0 ] [ I invA_FF*A_FF ] [ x_F ] = [b_F] |
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[ A_CF*invA_FF I ] [ 0 S ] [ 0 I ] [ x_C ] = [b_C] |
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|
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in the form |
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|
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b->[b_F,b_C] |
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x_F=invA_FF*b_F |
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b_C=b_C-A_CF*x_F |
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x_C=AMG(b_C) |
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b_F=b_F-A_FC*x_C |
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x_F=invA_FF*b_F |
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x<-[x_F,x_C] |
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|
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should be called within a parallel region |
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barrier synconization should be performed to make sure that the input vector available |
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|
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*/ |
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|
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void Paso_Solver_solveAMG(Paso_Solver_AMG * amg, double * x, double * b) { |
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dim_t i,k,oldsweeps; |
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dim_t n_block=amg->n_block; |
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double *r=MEMALLOC(amg->n,double); |
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/*Paso_Solver_GS* GS=NULL;*/ |
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double *bold=MEMALLOC(amg->n*amg->n_block,double); |
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double *bnew=MEMALLOC(amg->n*amg->n_block,double); |
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|
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/*if (amg->level==0) {*/ |
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if (amg->n_C<=10) { |
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Paso_UMFPACK1(amg->A,x,b,0); |
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} else { |
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/* presmoothing */ |
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Paso_Solver_solveGS(amg->GS,x,b); |
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oldsweeps=amg->GS->sweeps; |
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if (amg->GS->sweeps>1) { |
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|
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#pragma omp parallel for private(i) schedule(static) |
| 348 |
for (i=0;i<amg->GS->n*amg->GS->n_block;++i) bold[i]=b[i]; |
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|
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while(amg->GS->sweeps>1) { |
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#pragma omp parallel for private(i) schedule(static) |
| 352 |
for (i=0;i<amg->GS->n*amg->GS->n_block;++i) bnew[i]=bold[i]+b[i]; |
| 353 |
/* Compute the residual b=b-Ax*/ |
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Paso_SparseMatrix_MatrixVector_CSR_OFFSET0(DBLE(-1), amg->A, x, DBLE(1), bnew); |
| 355 |
/* Go round again*/ |
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Paso_Solver_solveGS(amg->GS,x,bnew); |
| 357 |
#pragma omp parallel for private(i) schedule(static) |
| 358 |
for (i=0;i<amg->GS->n*amg->GS->n_block;++i) bold[i]=bnew[i]; |
| 359 |
amg->GS->sweeps=amg->GS->sweeps-1; |
| 360 |
} |
| 361 |
} |
| 362 |
amg->GS->sweeps=oldsweeps; |
| 363 |
/* end of presmoothing */ |
| 364 |
|
| 365 |
#pragma omp parallel for private(i) schedule(static) |
| 366 |
for (i=0;i<amg->n;++i) r[i]=b[i]; |
| 367 |
|
| 368 |
/*r=b-Ax*/ |
| 369 |
Paso_SparseMatrix_MatrixVector_CSR_OFFSET0(-1.,amg->A,x,1.,r); |
| 370 |
|
| 371 |
/* b->[b_F,b_C] */ |
| 372 |
if (n_block==1) { |
| 373 |
#pragma omp parallel for private(i) schedule(static) |
| 374 |
for (i=0;i<amg->n_F;++i) amg->b_F[i]=r[amg->rows_in_F[i]]; |
| 375 |
#pragma omp parallel for private(i) schedule(static) |
| 376 |
for (i=0;i<amg->n_C;++i) amg->b_C[i]=r[amg->rows_in_C[i]]; |
| 377 |
} else { |
| 378 |
#pragma omp parallel for private(i,k) schedule(static) |
| 379 |
for (i=0;i<amg->n_F;++i) |
| 380 |
for (k=0;k<n_block;k++) amg->b_F[amg->n_block*i+k]=r[n_block*amg->rows_in_F[i]+k]; |
| 381 |
#pragma omp parallel for private(i,k) schedule(static) |
| 382 |
for (i=0;i<amg->n_C;++i) |
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for (k=0;k<n_block;k++) amg->b_C[amg->n_block*i+k]=r[n_block*amg->rows_in_C[i]+k]; |
| 384 |
} |
| 385 |
|
| 386 |
/* x_F=invA_FF*b_F */ |
| 387 |
Paso_Solver_applyBlockDiagonalMatrix(n_block,amg->n_F,amg->inv_A_FF,amg->A_FF_pivot,amg->x_F,amg->b_F); |
| 388 |
|
| 389 |
/* b_C=b_C-A_CF*x_F */ |
| 390 |
Paso_SparseMatrix_MatrixVector_CSR_OFFSET0(-1.,amg->A_CF,amg->x_F,1.,amg->b_C); |
| 391 |
|
| 392 |
/* x_C=AMG(b_C) */ |
| 393 |
Paso_Solver_solveAMG(amg->AMG_of_Schur,amg->x_C,amg->b_C); |
| 394 |
|
| 395 |
/* b_F=b_F-A_FC*x_C */ |
| 396 |
Paso_SparseMatrix_MatrixVector_CSR_OFFSET0(-1.,amg->A_FC,amg->x_C,1.,amg->b_F); |
| 397 |
/* x_F=invA_FF*b_F */ |
| 398 |
Paso_Solver_applyBlockDiagonalMatrix(n_block,amg->n_F,amg->inv_A_FF,amg->A_FF_pivot,amg->x_F,amg->b_F); |
| 399 |
/* x<-[x_F,x_C] */ |
| 400 |
|
| 401 |
if (n_block==1) { |
| 402 |
#pragma omp parallel for private(i) schedule(static) |
| 403 |
for (i=0;i<amg->n;++i) { |
| 404 |
if (amg->mask_C[i]>-1) { |
| 405 |
x[i]+=amg->x_C[amg->mask_C[i]]; |
| 406 |
} else { |
| 407 |
x[i]+=amg->x_F[amg->mask_F[i]]; |
| 408 |
} |
| 409 |
} |
| 410 |
} else { |
| 411 |
#pragma omp parallel for private(i,k) schedule(static) |
| 412 |
for (i=0;i<amg->n;++i) { |
| 413 |
if (amg->mask_C[i]>-1) { |
| 414 |
for (k=0;k<n_block;k++) x[n_block*i+k]+=amg->x_C[n_block*amg->mask_C[i]+k]; |
| 415 |
} else { |
| 416 |
for (k=0;k<n_block;k++) x[n_block*i+k]+=amg->x_F[n_block*amg->mask_F[i]+k]; |
| 417 |
} |
| 418 |
} |
| 419 |
} |
| 420 |
|
| 421 |
/*postsmoothing*/ |
| 422 |
Paso_Solver_solveGS1(amg->GS,x,b); |
| 423 |
if (amg->GS->sweeps>1) { |
| 424 |
#pragma omp parallel for private(i) schedule(static) |
| 425 |
for (i=0;i<amg->GS->n*amg->GS->n_block;++i) bold[i]=b[i]; |
| 426 |
|
| 427 |
while(amg->GS->sweeps>1) { |
| 428 |
#pragma omp parallel for private(i) schedule(static) |
| 429 |
for (i=0;i<amg->GS->n*amg->GS->n_block;++i) bnew[i]=bold[i]+b[i]; |
| 430 |
/* Compute the residual b=b-Ax*/ |
| 431 |
Paso_SparseMatrix_MatrixVector_CSR_OFFSET0(DBLE(-1), amg->A, x, DBLE(1), bnew); |
| 432 |
/* Go round again*/ |
| 433 |
Paso_Solver_solveGS1(amg->GS,x,bnew); |
| 434 |
#pragma omp parallel for private(i) schedule(static) |
| 435 |
for (i=0;i<amg->GS->n*amg->GS->n_block;++i) bold[i]=bnew[i]; |
| 436 |
amg->GS->sweeps=amg->GS->sweeps-1; |
| 437 |
} |
| 438 |
} |
| 439 |
/*end of postsmoothing*/ |
| 440 |
|
| 441 |
/*Paso_Solver_GS_free(GS);*/ |
| 442 |
} |
| 443 |
MEMFREE(r); |
| 444 |
MEMFREE(bold); |
| 445 |
MEMFREE(bnew); |
| 446 |
return; |
| 447 |
} |
| 448 |
|
| 449 |
/* |
| 450 |
* $Log$ |
| 451 |
* |
| 452 |
*/ |
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