int main(int argc,char **argv) { PetscErrorCode ierr; DM da,*subda; PetscInt i,dim=3; PetscMPIInt size,rank; Vec v; Vec slvec,sgvec; IS *ois,*iis; VecScatter oscata; VecScatter *iscat,*oscat,*gscat; DMDALocalInfo info; ierr = PetscInitialize(&argc,&argv,(char*)0,help);CHKERRQ(ierr); ierr = PetscOptionsGetInt(NULL,NULL,"-dim",&dim,NULL);CHKERRQ(ierr); /* Create distributed array and get vectors */ ierr = MPI_Comm_size(PETSC_COMM_WORLD,&size);CHKERRQ(ierr); ierr = MPI_Comm_rank(PETSC_COMM_WORLD,&rank);CHKERRQ(ierr); if (dim == 2) { ierr = DMDACreate2d(PETSC_COMM_WORLD,DM_BOUNDARY_NONE,DM_BOUNDARY_NONE,DMDA_STENCIL_STAR,-4,-4,PETSC_DECIDE,PETSC_DECIDE,3,1,NULL,NULL,&da);CHKERRQ(ierr); } else if (dim == 3) { ierr = DMDACreate3d(PETSC_COMM_WORLD, DM_BOUNDARY_NONE, DM_BOUNDARY_NONE,DM_BOUNDARY_NONE,DMDA_STENCIL_STAR,-4,-4,-4,PETSC_DECIDE,PETSC_DECIDE,PETSC_DECIDE,3,1,NULL,NULL,NULL,&da);CHKERRQ(ierr); } ierr = DMDAGetLocalInfo(da,&info);CHKERRQ(ierr); ierr = DMCreateDomainDecomposition(da,NULL,NULL,&iis,&ois,&subda);CHKERRQ(ierr); ierr = DMCreateDomainDecompositionScatters(da,1,subda,&iscat,&oscat,&gscat);CHKERRQ(ierr); { DMDALocalInfo subinfo; MatStencil lower,upper; IS patchis,subpatchis; Vec smallvec; Vec largevec; VecScatter patchscat; ierr = DMDAGetLocalInfo(subda[0],&subinfo);CHKERRQ(ierr); lower.i = info.xs; lower.j = info.ys; lower.k = info.zs; upper.i = info.xs+info.xm; upper.j = info.ys+info.ym; upper.k = info.zs+info.zm; /* test the patch IS as a thing to scatter to/from */ ierr = DMDACreatePatchIS(da,&lower,&upper,&patchis);CHKERRQ(ierr); ierr = DMGetGlobalVector(da,&largevec);CHKERRQ(ierr); ierr = VecCreate(PETSC_COMM_SELF,&smallvec);CHKERRQ(ierr); ierr = VecSetSizes(smallvec,info.dof*(upper.i - lower.i)*(upper.j - lower.j)*(upper.k - lower.k),PETSC_DECIDE);CHKERRQ(ierr); ierr = VecSetFromOptions(smallvec);CHKERRQ(ierr); ierr = VecScatterCreate(smallvec,NULL,largevec,patchis,&patchscat);CHKERRQ(ierr); ierr = FillLocalSubdomain(subda[0],smallvec);CHKERRQ(ierr); ierr = VecSet(largevec,0);CHKERRQ(ierr); ierr = VecScatterBegin(patchscat,smallvec,largevec,ADD_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); ierr = VecScatterEnd(patchscat,smallvec,largevec,ADD_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); for (i = 0; i < size; i++) { if (i == rank) { ierr = ISView(patchis,PETSC_VIEWER_STDOUT_SELF);CHKERRQ(ierr); ierr = VecScatterView(patchscat,PETSC_VIEWER_STDOUT_SELF);CHKERRQ(ierr); ierr = VecView(smallvec,PETSC_VIEWER_STDOUT_SELF);CHKERRQ(ierr); } ierr = MPI_Barrier(PETSC_COMM_WORLD);CHKERRQ(ierr); } ierr = MPI_Barrier(PETSC_COMM_WORLD);CHKERRQ(ierr); ierr = VecView(largevec,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); ierr = VecDestroy(&smallvec);CHKERRQ(ierr); ierr = DMRestoreGlobalVector(da,&largevec);CHKERRQ(ierr); ierr = ISDestroy(&patchis);CHKERRQ(ierr); ierr = VecScatterDestroy(&patchscat);CHKERRQ(ierr); } /* view the various parts */ { for (i = 0; i < size; i++) { if (i == rank) { ierr = PetscPrintf(PETSC_COMM_SELF,"Processor %d: \n",i);CHKERRQ(ierr); ierr = DMView(subda[0],PETSC_VIEWER_STDOUT_SELF);CHKERRQ(ierr); } ierr = MPI_Barrier(PETSC_COMM_WORLD);CHKERRQ(ierr); } ierr = DMGetLocalVector(subda[0],&slvec);CHKERRQ(ierr); ierr = DMGetGlobalVector(subda[0],&sgvec);CHKERRQ(ierr); ierr = DMGetGlobalVector(da,&v);CHKERRQ(ierr); /* test filling outer between the big DM and the small ones with the IS scatter*/ ierr = VecScatterCreate(v,ois[0],sgvec,NULL,&oscata);CHKERRQ(ierr); ierr = FillLocalSubdomain(subda[0],sgvec);CHKERRQ(ierr); ierr = VecScatterBegin(oscata,sgvec,v,ADD_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); ierr = VecScatterEnd(oscata,sgvec,v,ADD_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); /* test the local-to-local scatter */ /* fill up the local subdomain and then add them together */ ierr = FillLocalSubdomain(da,v);CHKERRQ(ierr); ierr = VecScatterBegin(gscat[0],v,slvec,ADD_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); ierr = VecScatterEnd(gscat[0],v,slvec,ADD_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); ierr = VecView(v,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); /* test ghost scattering backwards */ ierr = VecSet(v,0);CHKERRQ(ierr); ierr = VecScatterBegin(gscat[0],slvec,v,ADD_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); ierr = VecScatterEnd(gscat[0],slvec,v,ADD_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); ierr = VecView(v,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); /* test overlap scattering backwards */ ierr = DMLocalToGlobalBegin(subda[0],slvec,ADD_VALUES,sgvec);CHKERRQ(ierr); ierr = DMLocalToGlobalEnd(subda[0],slvec,ADD_VALUES,sgvec);CHKERRQ(ierr); ierr = VecSet(v,0);CHKERRQ(ierr); ierr = VecScatterBegin(oscat[0],sgvec,v,ADD_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); ierr = VecScatterEnd(oscat[0],sgvec,v,ADD_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); ierr = VecView(v,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); /* test interior scattering backwards */ ierr = VecSet(v,0);CHKERRQ(ierr); ierr = VecScatterBegin(iscat[0],sgvec,v,ADD_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); ierr = VecScatterEnd(iscat[0],sgvec,v,ADD_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); ierr = VecView(v,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); /* test matrix allocation */ for (i = 0; i < size; i++) { if (i == rank) { Mat m; ierr = PetscPrintf(PETSC_COMM_SELF,"Processor %d: \n",i);CHKERRQ(ierr); ierr = DMSetMatType(subda[0],MATAIJ);CHKERRQ(ierr); ierr = DMCreateMatrix(subda[0],&m);CHKERRQ(ierr); ierr = MatView(m,PETSC_VIEWER_STDOUT_SELF);CHKERRQ(ierr); ierr = MatDestroy(&m);CHKERRQ(ierr); } ierr = MPI_Barrier(PETSC_COMM_WORLD);CHKERRQ(ierr); } ierr = DMRestoreLocalVector(subda[0],&slvec);CHKERRQ(ierr); ierr = DMRestoreGlobalVector(subda[0],&sgvec);CHKERRQ(ierr); ierr = DMRestoreGlobalVector(da,&v);CHKERRQ(ierr); } ierr = DMDestroy(&subda[0]);CHKERRQ(ierr); ierr = ISDestroy(&ois[0]);CHKERRQ(ierr); ierr = ISDestroy(&iis[0]);CHKERRQ(ierr); ierr = VecScatterDestroy(&iscat[0]);CHKERRQ(ierr); ierr = VecScatterDestroy(&oscat[0]);CHKERRQ(ierr); ierr = VecScatterDestroy(&gscat[0]);CHKERRQ(ierr); ierr = VecScatterDestroy(&oscata);CHKERRQ(ierr); ierr = PetscFree(iscat);CHKERRQ(ierr); ierr = PetscFree(oscat);CHKERRQ(ierr); ierr = PetscFree(gscat);CHKERRQ(ierr); ierr = PetscFree(oscata);CHKERRQ(ierr); ierr = PetscFree(subda);CHKERRQ(ierr); ierr = PetscFree(ois);CHKERRQ(ierr); ierr = PetscFree(iis);CHKERRQ(ierr); ierr = DMDestroy(&da);CHKERRQ(ierr); ierr = PetscFinalize(); return 0; }
PetscErrorCode SNESSetUp_NASM(SNES snes) { SNES_NASM *nasm = (SNES_NASM*)snes->data; PetscErrorCode ierr; DM dm,subdm; DM *subdms; PetscInt i; const char *optionsprefix; Vec F; PetscMPIInt size; KSP ksp; PC pc; PetscFunctionBegin; if (!nasm->subsnes) { ierr = SNESGetDM(snes,&dm);CHKERRQ(ierr); if (dm) { nasm->usesdm = PETSC_TRUE; ierr = DMCreateDomainDecomposition(dm,&nasm->n,NULL,NULL,NULL,&subdms);CHKERRQ(ierr); if (!subdms) SETERRQ(PetscObjectComm((PetscObject)dm),PETSC_ERR_ARG_WRONGSTATE,"DM has no default decomposition defined. Set subsolves manually with SNESNASMSetSubdomains()."); ierr = DMCreateDomainDecompositionScatters(dm,nasm->n,subdms,&nasm->iscatter,&nasm->oscatter,&nasm->gscatter);CHKERRQ(ierr); ierr = SNESGetOptionsPrefix(snes, &optionsprefix);CHKERRQ(ierr); ierr = PetscMalloc(nasm->n*sizeof(SNES),&nasm->subsnes);CHKERRQ(ierr); for (i=0; i<nasm->n; i++) { ierr = SNESCreate(PETSC_COMM_SELF,&nasm->subsnes[i]);CHKERRQ(ierr); ierr = SNESAppendOptionsPrefix(nasm->subsnes[i],optionsprefix);CHKERRQ(ierr); ierr = SNESAppendOptionsPrefix(nasm->subsnes[i],"sub_");CHKERRQ(ierr); ierr = SNESSetDM(nasm->subsnes[i],subdms[i]);CHKERRQ(ierr); ierr = MPI_Comm_size(PetscObjectComm((PetscObject)nasm->subsnes[i]),&size);CHKERRQ(ierr); if (size == 1) { ierr = SNESGetKSP(nasm->subsnes[i],&ksp);CHKERRQ(ierr); ierr = KSPGetPC(ksp,&pc);CHKERRQ(ierr); ierr = KSPSetType(ksp,KSPPREONLY);CHKERRQ(ierr); ierr = PCSetType(pc,PCLU);CHKERRQ(ierr); } ierr = SNESSetFromOptions(nasm->subsnes[i]);CHKERRQ(ierr); ierr = DMDestroy(&subdms[i]);CHKERRQ(ierr); } ierr = PetscFree(subdms);CHKERRQ(ierr); } else SETERRQ(PetscObjectComm((PetscObject)snes),PETSC_ERR_ARG_WRONGSTATE,"Cannot construct local problems automatically without a DM!"); } else SETERRQ(PetscObjectComm((PetscObject)snes),PETSC_ERR_ARG_WRONGSTATE,"Must set subproblems manually if there is no DM!"); /* allocate the global vectors */ if (!nasm->x) { ierr = PetscMalloc(nasm->n*sizeof(Vec),&nasm->x);CHKERRQ(ierr); ierr = PetscMemzero(nasm->x,nasm->n*sizeof(Vec));CHKERRQ(ierr); } if (!nasm->xl) { ierr = PetscMalloc(nasm->n*sizeof(Vec),&nasm->xl);CHKERRQ(ierr); ierr = PetscMemzero(nasm->xl,nasm->n*sizeof(Vec));CHKERRQ(ierr); } if (!nasm->y) { ierr = PetscMalloc(nasm->n*sizeof(Vec),&nasm->y);CHKERRQ(ierr); ierr = PetscMemzero(nasm->y,nasm->n*sizeof(Vec));CHKERRQ(ierr); } if (!nasm->b) { ierr = PetscMalloc(nasm->n*sizeof(Vec),&nasm->b);CHKERRQ(ierr); ierr = PetscMemzero(nasm->b,nasm->n*sizeof(Vec));CHKERRQ(ierr); } for (i=0; i<nasm->n; i++) { ierr = SNESGetFunction(nasm->subsnes[i],&F,NULL,NULL);CHKERRQ(ierr); if (!nasm->x[i]) {ierr = VecDuplicate(F,&nasm->x[i]);CHKERRQ(ierr);} if (!nasm->y[i]) {ierr = VecDuplicate(F,&nasm->y[i]);CHKERRQ(ierr);} if (!nasm->b[i]) {ierr = VecDuplicate(F,&nasm->b[i]);CHKERRQ(ierr);} if (!nasm->xl[i]) { ierr = SNESGetDM(nasm->subsnes[i],&subdm);CHKERRQ(ierr); ierr = DMCreateLocalVector(subdm,&nasm->xl[i]);CHKERRQ(ierr); } ierr = DMGlobalToLocalHookAdd(subdm,DMGlobalToLocalSubDomainDirichletHook_Private,NULL,nasm->xl[i]);CHKERRQ(ierr); } if (nasm->finaljacobian) { ierr = SNESSetUpMatrices(snes);CHKERRQ(ierr); if (nasm->fjtype == 2) { ierr = VecDuplicate(snes->vec_sol,&nasm->xinit);CHKERRQ(ierr); } for (i=0; i<nasm->n;i++) { ierr = SNESSetUpMatrices(nasm->subsnes[i]);CHKERRQ(ierr); } } PetscFunctionReturn(0); }