Date: 2024-10-28T09:13:30+00:00

Actual source code: test43.c
slepc-3.22.1 2024-10-28
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      1: /*
      2:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
      3:    SLEPc - Scalable Library for Eigenvalue Problem Computations
      4:    Copyright (c) 2002-, Universitat Politecnica de Valencia, Spain

      6:    This file is part of SLEPc.
      7:    SLEPc is distributed under a 2-clause BSD license (see LICENSE).
      8:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
      9: */

     11: static char help[] = "Solves a linear system using PCHPDDM.\n"
     12:   "Modification of ${PETSC_DIR}/src/ksp/ksp/tutorials/ex76.c where concurrent EPS are instantiated explicitly by the user.\n\n";

     14: #include <slepceps.h>

     16: int main(int argc,char **args)
     17: {
     18:   Mat            A,aux,a,P,B,X;
     19:   Vec            b;
     20:   KSP            ksp;
     21:   PC             pc;
     22:   EPS            eps;
     23:   ST             st;
     24:   IS             is,sizes;
     25:   const PetscInt *idx;
     26:   PetscInt       m,rstart,rend,location,nev,nconv;
     27:   PetscMPIInt    rank,size;
     28:   PetscViewer    viewer;
     29:   char           dir[PETSC_MAX_PATH_LEN],name[PETSC_MAX_PATH_LEN];
     30:   PetscBool      flg;

     32:   PetscFunctionBeginUser;
     33:   PetscCall(SlepcInitialize(&argc,&args,NULL,help));
     34:   PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD,&size));
     35:   PetscCheck(size == 4,PETSC_COMM_WORLD,PETSC_ERR_USER,"This example requires 4 processes");
     36:   PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD,&rank));
     37:   PetscCall(MatCreate(PETSC_COMM_WORLD,&A));
     38:   PetscCall(MatCreate(PETSC_COMM_SELF,&aux));
     39:   PetscCall(ISCreate(PETSC_COMM_SELF,&is));
     40:   PetscCall(PetscStrcpy(dir,"."));
     41:   PetscCall(PetscOptionsGetString(NULL,NULL,"-load_dir",dir,sizeof(dir),NULL));
     42:   /* loading matrices */
     43:   PetscCall(PetscSNPrintf(name,sizeof(name),"%s/sizes_%d_%d.dat",dir,rank,size));
     44:   PetscCall(PetscViewerBinaryOpen(PETSC_COMM_SELF,name,FILE_MODE_READ,&viewer));
     45:   PetscCall(ISCreate(PETSC_COMM_SELF,&sizes));
     46:   PetscCall(ISLoad(sizes,viewer));
     47:   PetscCall(ISGetIndices(sizes,&idx));
     48:   PetscCall(MatSetSizes(A,idx[0],idx[1],idx[2],idx[3]));
     49:   PetscCall(ISRestoreIndices(sizes,&idx));
     50:   PetscCall(ISDestroy(&sizes));
     51:   PetscCall(PetscViewerDestroy(&viewer));
     52:   PetscCall(PetscSNPrintf(name,sizeof(name),"%s/A.dat",dir));
     53:   PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD,name,FILE_MODE_READ,&viewer));
     54:   PetscCall(MatLoad(A,viewer));
     55:   PetscCall(PetscViewerDestroy(&viewer));
     56:   PetscCall(PetscSNPrintf(name,sizeof(name),"%s/is_%d_%d.dat",dir,rank,size));
     57:   PetscCall(PetscViewerBinaryOpen(PETSC_COMM_SELF,name,FILE_MODE_READ,&viewer));
     58:   PetscCall(ISLoad(is,viewer));
     59:   PetscCall(PetscViewerDestroy(&viewer));
     60:   PetscCall(ISSetBlockSize(is,2));
     61:   PetscCall(PetscSNPrintf(name,sizeof(name),"%s/Neumann_%d_%d.dat",dir,rank,size));
     62:   PetscCall(PetscViewerBinaryOpen(PETSC_COMM_SELF,name,FILE_MODE_READ,&viewer));
     63:   PetscCall(MatLoad(aux,viewer));
     64:   PetscCall(PetscViewerDestroy(&viewer));
     65:   PetscCall(MatSetBlockSizesFromMats(aux,A,A));
     66:   PetscCall(MatSetOption(A,MAT_SYMMETRIC,PETSC_TRUE));
     67:   PetscCall(MatSetOption(aux,MAT_SYMMETRIC,PETSC_TRUE));
     68:   /* ready for testing */
     69:   PetscCall(KSPCreate(PETSC_COMM_WORLD,&ksp));
     70:   PetscCall(KSPSetOperators(ksp,A,A));
     71:   PetscCall(KSPGetPC(ksp,&pc));
     72:   PetscCall(PCSetType(pc,PCHPDDM));
     73:   PetscCall(MatDuplicate(aux,MAT_DO_NOT_COPY_VALUES,&B)); /* duplicate so that MatStructure is SAME_NONZERO_PATTERN */
     74:   PetscCall(MatGetDiagonalBlock(A,&a));
     75:   PetscCall(MatGetOwnershipRange(A,&rstart,&rend));
     76:   PetscCall(ISGetLocalSize(is,&m));
     77:   PetscCall(MatCreateSeqAIJ(PETSC_COMM_SELF,rend-rstart,m,1,NULL,&P));
     78:   for (m = rstart; m < rend; ++m) {
     79:     PetscCall(ISLocate(is,m,&location));
     80:     PetscCheck(location >= 0,PETSC_COMM_SELF,PETSC_ERR_ARG_WRONG,"IS of the auxiliary Mat does not include all local rows of A");
     81:     PetscCall(MatSetValue(P,m-rstart,location,1.0,INSERT_VALUES));
     82:   }
     83:   PetscCall(MatAssemblyBegin(P,MAT_FINAL_ASSEMBLY));
     84:   PetscCall(MatAssemblyEnd(P,MAT_FINAL_ASSEMBLY));
     85:   PetscCall(MatPtAP(a,P,MAT_INITIAL_MATRIX,1.0,&X));
     86:   PetscCall(MatDestroy(&P));
     87:   PetscCall(MatAXPY(B,1.0,X,SUBSET_NONZERO_PATTERN));
     88:   PetscCall(MatDestroy(&X));
     89:   PetscCall(MatSetOption(B,MAT_SYMMETRIC,PETSC_TRUE));
     90:   PetscCall(EPSCreate(PETSC_COMM_SELF,&eps));
     91:   PetscCall(EPSSetOperators(eps,aux,B));
     92:   PetscCall(EPSSetProblemType(eps,EPS_GHEP));
     93:   PetscCall(EPSSetTarget(eps,0.0));
     94:   PetscCall(EPSSetWhichEigenpairs(eps,EPS_TARGET_MAGNITUDE));
     95:   PetscCall(EPSGetST(eps,&st));
     96:   PetscCall(STSetType(st,STSINVERT));
     97:   PetscCall(EPSSetFromOptions(eps));
     98:   PetscCall(EPSGetDimensions(eps,&nev,NULL,NULL));
     99:   PetscCall(EPSSolve(eps));
    100:   PetscCall(EPSGetConverged(eps,&nconv));
    101:   nev = PetscMin(nev,nconv);
    102:   PetscCall(ISGetLocalSize(is,&m));
    103:   PetscCall(MatCreateSeqDense(PETSC_COMM_SELF,m,nev,NULL,&P));
    104:   for (m = 0; m < nev; ++m) {
    105:     PetscCall(MatDenseGetColumnVecWrite(P,m,&b));
    106:     PetscCall(EPSGetEigenvector(eps,m,b,NULL));
    107:     PetscCall(MatDenseRestoreColumnVecWrite(P,m,&b));
    108:   }
    109:   PetscCall(EPSDestroy(&eps));
    110:   PetscCall(MatDestroy(&B));
    111:   PetscCall(PCHPDDMSetDeflationMat(pc,is,P));
    112:   PetscCall(MatDestroy(&P));
    113:   PetscCall(MatDestroy(&aux));
    114:   PetscCall(KSPSetFromOptions(ksp));
    115:   PetscCall(ISDestroy(&is));
    116:   PetscCall(MatCreateVecs(A,NULL,&b));
    117:   PetscCall(VecSet(b,1.0));
    118:   PetscCall(KSPSolve(ksp,b,b));
    119:   PetscCall(PetscObjectTypeCompare((PetscObject)pc,PCHPDDM,&flg));
    120:   if (flg) {
    121:     PetscCall(PCHPDDMGetSTShareSubKSP(pc,&flg));
    122:     /* since EPSSolve() is called outside PCSetUp_HPDDM() and there is not mechanism (yet) to pass the underlying ST, */
    123:     /* PCHPDDMGetSTShareSubKSP() should not return PETSC_TRUE when using PCHPDDMSetDeflationMat()                     */
    124:     PetscCheck(!flg,PETSC_COMM_SELF,PETSC_ERR_PLIB,"PCHPDDMGetSTShareSubKSP() should not return PETSC_TRUE");
    125:   }
    126:   PetscCall(VecDestroy(&b));
    127:   PetscCall(KSPDestroy(&ksp));
    128:   PetscCall(MatDestroy(&A));
    129:   PetscCall(SlepcFinalize());
    130:   return 0;
    131: }

    133: /*TEST

    135:    build:
    136:       requires: hpddm

    138:    test:
    139:       requires: double !complex !defined(PETSC_USE_64BIT_INDICES) defined(PETSC_HAVE_DYNAMIC_LIBRARIES)
    140:       nsize: 4
    141:       filter: grep -v "    total: nonzeros=" | grep -v "    rows=" | grep -v "       factor fill ratio given " | grep -v "      using I-node" | sed -e "s/Linear solve converged due to CONVERGED_RTOL iterations 5/Linear solve converged due to CONVERGED_RTOL iterations 4/g" -e "s/amount of overlap = 1/user-defined overlap/g"
    142:       # similar output as ex76 with -pc_hpddm_levels_eps_nev val instead of just -eps_nev val
    143:       args: -ksp_rtol 1e-3 -ksp_max_it 10 -ksp_error_if_not_converged -ksp_converged_reason -ksp_view -ksp_type hpddm -pc_type hpddm -pc_hpddm_levels_1_sub_pc_type lu -pc_hpddm_define_subdomains {{false true}shared output} -pc_hpddm_levels_1_pc_type asm -pc_hpddm_levels_1_sub_pc_type lu -pc_hpddm_levels_1_st_share_sub_ksp -eps_nev 10 -load_dir ${DATAFILESPATH}/matrices/hpddm/GENEO -matload_block_size 2

    145: TEST*/