Date: 2021-03-03T22:27:35+00:00

Actual source code: ex77f.F90
petsc-3.14.5 2021-03-03
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      1: !
      2: !   Description: Solves a linear system with a block of right-hand sides using KSPHPDDM.
      3: !

      5:       program main
      6: #include <petsc/finclude/petscksp.h>
      7:       use petscksp
      8:       implicit none
      9:       Mat                            X,B
     10:       Mat                            A
     11:       KSP                            ksp
     12:       PC                             pc
     13:       Mat                            F
     14:       PetscScalar                    alpha
     15:       PetscReal                      norm
     16:       PetscInt                       m,K
     17:       PetscViewer                    viewer
     18:       character*(PETSC_MAX_PATH_LEN) name
     19:       PetscBool                      flg
     20:       PetscErrorCode                 ierr

     22:       call PetscInitialize(PETSC_NULL_CHARACTER,ierr)
     23:       if (ierr .ne. 0) then
     24:         print *,'Unable to initialize PETSc'
     25:         stop
     26:       endif
     27:       call PetscOptionsGetString(PETSC_NULL_OPTIONS,PETSC_NULL_CHARACTER,'-f',name,flg,ierr);CHKERRA(ierr)
     28:       if (flg .eqv. PETSC_FALSE) then
     29:         SETERRA(PETSC_COMM_WORLD,PETSC_ERR_SUP,'Must provide a binary file for the matrix')
     30:       endif
     31:       K = 5
     32:       call PetscOptionsGetInt(PETSC_NULL_OPTIONS,PETSC_NULL_CHARACTER,'-n',K,flg,ierr);CHKERRA(ierr)
     33:       call MatCreate(PETSC_COMM_WORLD,A,ierr);CHKERRA(ierr)
     34:       call KSPCreate(PETSC_COMM_WORLD,ksp,ierr);CHKERRA(ierr)
     35:       call KSPSetOperators(ksp,A,A,ierr);CHKERRA(ierr)
     36:       call PetscViewerBinaryOpen(PETSC_COMM_WORLD,name,FILE_MODE_READ,viewer,ierr);CHKERRA(ierr)
     37:       call MatLoad(A,viewer,ierr);CHKERRA(ierr)
     38:       call PetscViewerDestroy(viewer,ierr);CHKERRA(ierr)
     39:       call MatGetLocalSize(A,m,PETSC_NULL_INTEGER,ierr);CHKERRA(ierr)
     40:       call MatCreateDense(PETSC_COMM_WORLD,m,PETSC_DECIDE,PETSC_DECIDE,K,PETSC_NULL_SCALAR,B,ierr);CHKERRA(ierr)
     41:       call MatCreateDense(PETSC_COMM_WORLD,m,PETSC_DECIDE,PETSC_DECIDE,K,PETSC_NULL_SCALAR,X,ierr);CHKERRA(ierr)
     42:       call MatSetRandom(B,PETSC_NULL_RANDOM,ierr);CHKERRA(ierr)
     43:       call KSPSetFromOptions(ksp,ierr);CHKERRA(ierr)
     44:       call KSPSetUp(ksp,ierr);CHKERRA(ierr)
     45:       call KSPMatSolve(ksp,B,X,ierr);CHKERRA(ierr)
     46:       call KSPGetMatSolveBlockSize(ksp,M,ierr);CHKERRA(ierr)
     47:       if (M .ne. PETSC_DECIDE) then
     48:         call KSPSetMatSolveBlockSize(ksp,PETSC_DECIDE,ierr);CHKERRA(ierr)
     49:         call MatZeroEntries(X,ierr);CHKERRA(ierr)
     50:         call KSPMatSolve(ksp,B,X,ierr);CHKERRA(ierr)
     51:       endif
     52:       call KSPGetPC(ksp,pc,ierr);CHKERRA(ierr)
     53:       call PetscObjectTypeCompare(pc,PCLU,flg,ierr);CHKERRA(ierr)
     54:       if (flg) then
     55:         call PCFactorGetMatrix(pc,F,ierr);CHKERRA(ierr)
     56:         call MatMatSolve(F,B,B,ierr);CHKERRA(ierr)
     57:         alpha = -1.0
     58:         call MatAYPX(B,alpha,X,SAME_NONZERO_PATTERN,ierr);CHKERRA(ierr)
     59:         call MatNorm(B,NORM_INFINITY,norm,ierr);CHKERRA(ierr)
     60:         if (norm > 100*PETSC_MACHINE_EPSILON) then
     61:           SETERRA(PETSC_COMM_WORLD,PETSC_ERR_PLIB,'KSPMatSolve() and MatMatSolve() difference has nonzero norm')
     62:         endif
     63:       endif
     64:       call MatDestroy(X,ierr);CHKERRA(ierr)
     65:       call MatDestroy(B,ierr);CHKERRA(ierr)
     66:       call MatDestroy(A,ierr);CHKERRA(ierr)
     67:       call KSPDestroy(ksp,ierr);CHKERRA(ierr)
     68:       call PetscFinalize(ierr)
     69:       end

     71: !/*TEST
     72: !
     73: !   testset:
     74: !      nsize: 2
     75: !      requires: datafilespath double !complex !define(PETSC_USE_64BIT_INDICES)
     76: !      args: -ksp_converged_reason -ksp_max_it 1000 -f ${DATAFILESPATH}/matrices/hpddm/GCRODR/A_400.dat
     77: !      test:
     78: !         suffix: 1
     79: !         output_file: output/ex77_1.out
     80: !         args:
     81: !      test:
     82: !         suffix: 2a
     83: !         requires: hpddm
     84: !         output_file: output/ex77_2_ksp_hpddm_type-gmres.out
     85: !         args: -ksp_type hpddm -pc_type asm -ksp_hpddm_type gmres
     86: !      test:
     87: !         suffix: 2b
     88: !         requires: hpddm
     89: !         output_file: output/ex77_2_ksp_hpddm_type-bgmres.out
     90: !         args: -ksp_type hpddm -pc_type asm -ksp_hpddm_type bgmres
     91: !      test:
     92: !         suffix: 3a
     93: !         requires: hpddm
     94: !         output_file: output/ex77_3_ksp_hpddm_type-gcrodr.out
     95: !         args: -ksp_type hpddm -ksp_hpddm_recycle 5 -ksp_hpddm_type gcrodr
     96: !      test:
     97: !         suffix: 3b
     98: !         requires: hpddm
     99: !         output_file: output/ex77_3_ksp_hpddm_type-bgcrodr.out
    100: !         args: -ksp_type hpddm -ksp_hpddm_recycle 5 -ksp_hpddm_type bgcrodr
    101: !      test:
    102: !         nsize: 4
    103: !         suffix: 4
    104: !         requires: hpddm
    105: !         output_file: output/ex77_4.out
    106: !         args: -ksp_rtol 1e-4 -ksp_type hpddm -ksp_hpddm_recycle 5 -ksp_hpddm_type bgcrodr -ksp_view_final_residual -N 12 -ksp_matsolve_block_size 5
    107: !   test:
    108: !      nsize: 1
    109: !      suffix: preonly
    110: !      requires: hpddm datafilespath double !complex !define(PETSC_USE_64BIT_INDICES)
    111: !      output_file: output/ex77_preonly.out
    112: !      args: -N 6 -f ${DATAFILESPATH}/matrices/hpddm/GCRODR/A_400.dat -pc_type lu -ksp_type hpddm -ksp_hpddm_type preonly
    113: !   test:
    114: !      nsize: 4
    115: !      suffix: 4_slepc
    116: !      requires: hpddm datafilespath double !complex !define(PETSC_USE_64BIT_INDICES) slepc
    117: !      output_file: output/ex77_4.out
    118: !      filter: sed "/^ksp_hpddm_recycle_ Linear eigensolve converged/d"
    119: !      args: -ksp_converged_reason -ksp_max_it 500 -f ${DATAFILESPATH}/matrices/hpddm/GCRODR/A_400.dat -ksp_rtol 1e-4 -ksp_type hpddm -ksp_hpddm_recycle 5 -ksp_hpddm_type bgcrodr -ksp_view_final_residual -N 12 -ksp_matsolve_block_size 5 -ksp_hpddm_recycle_redistribute 2 -ksp_hpddm_recycle_mat_type dense -ksp_hpddm_recycle_eps_converged_reason -ksp_hpddm_recycle_st_pc_type redundant
    120: !
    121: !TEST*/