Actual source code: ex76f.F90

petsc-master 2020-10-26
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  1: !
  2: !   Description: Solves a linear systems using PCHPDDM.
  3: !

  5:       program main
  6: #include <petsc/finclude/petscksp.h>
  7:       use petscksp
  8:       use petscisdef
  9:       implicit none
 10:       Vec                            x,b
 11:       Mat                            A,aux,Y,C
 12:       KSP                            ksp
 13:       PC                             pc
 14:       IS                             is,sizes
 15:       PetscScalar                    one
 16:       PetscInt, pointer ::           idx(:)
 17:       PetscMPIInt                    rank,size
 18:       PetscInt                       m,N
 19:       PetscViewer                    viewer
 20:       character*(PETSC_MAX_PATH_LEN) dir,name
 21:       character*(8)                  fmt
 22:       character(1)                   crank,csize
 23:       PetscBool                      flg
 24:       PetscErrorCode                 ierr

 26:       call PetscInitialize(PETSC_NULL_CHARACTER,ierr)
 27:       if (ierr .ne. 0) then
 28:         print *,'Unable to initialize PETSc'
 29:         stop
 30:       endif
 31:       call MPI_Comm_size(PETSC_COMM_WORLD,size,ierr)
 32:       if (size .ne. 4) then
 33:         print *,'This example requires 4 processes'
 34:         stop
 35:       endif
 36:       N = 1
 37:       call PetscOptionsGetInt(PETSC_NULL_OPTIONS,PETSC_NULL_CHARACTER,'-rhs',N,flg,ierr);CHKERRA(ierr)
 38:       call MPI_Comm_rank(PETSC_COMM_WORLD,rank,ierr)
 39:       call MatCreate(PETSC_COMM_WORLD,A,ierr);CHKERRA(ierr)
 40:       call MatCreate(PETSC_COMM_SELF,aux,ierr);CHKERRA(ierr)
 41:       call ISCreate(PETSC_COMM_SELF,is,ierr);CHKERRA(ierr)
 42:       dir = '.'
 43:       call PetscOptionsGetString(PETSC_NULL_OPTIONS,PETSC_NULL_CHARACTER,'-load_dir',dir,flg,ierr);CHKERRA(ierr)
 44:       fmt = '(I1)'
 45:       write (crank,fmt) rank
 46:       write (csize,fmt) size
 47:       write (name,'(a)')trim(dir)//'/sizes_'//crank//'_'//csize//'.dat'
 48:       call PetscViewerBinaryOpen(PETSC_COMM_SELF,name,FILE_MODE_READ, viewer,ierr);CHKERRA(ierr)
 49:       call ISCreate(PETSC_COMM_SELF,sizes,ierr);CHKERRA(ierr)
 50:       call ISLoad(sizes,viewer,ierr);CHKERRA(ierr)
 51:       call ISGetIndicesF90(sizes,idx,ierr);CHKERRA(ierr)
 52:       call MatSetSizes(A,idx(1),idx(2),idx(3),idx(4),ierr);CHKERRA(ierr)
 53:       call ISRestoreIndicesF90(sizes,idx,ierr);CHKERRA(ierr)
 54:       call ISDestroy(sizes,ierr);CHKERRA(ierr)
 55:       call PetscViewerDestroy(viewer,ierr);CHKERRA(ierr)
 56:       call MatSetUp(A,ierr);CHKERRA(ierr)
 57:       write (name,'(a)')trim(dir)//'/A.dat'
 58:       call PetscViewerBinaryOpen(PETSC_COMM_WORLD,name,FILE_MODE_READ,viewer,ierr);CHKERRA(ierr)
 59:       call MatLoad(A,viewer,ierr);CHKERRA(ierr)
 60:       call PetscViewerDestroy(viewer,ierr);CHKERRA(ierr)
 61:       write (name,'(a)')trim(dir)//'/is_'//crank//'_'//csize//'.dat'
 62:       call PetscViewerBinaryOpen(PETSC_COMM_SELF,name,FILE_MODE_READ,viewer,ierr);CHKERRA(ierr)
 63:       call ISLoad(is,viewer,ierr);CHKERRA(ierr)
 64:       call PetscViewerDestroy(viewer,ierr);CHKERRA(ierr)
 65:       write (name,'(a)')trim(dir)//'/Neumann_'//crank//'_'//csize//'.dat'
 66:       call PetscViewerBinaryOpen(PETSC_COMM_SELF,name,FILE_MODE_READ,viewer,ierr);CHKERRA(ierr)
 67:       call MatSetBlockSizesFromMats(aux,A,A,ierr);CHKERRA(ierr)
 68:       call MatLoad(aux,viewer,ierr);CHKERRA(ierr)
 69:       call PetscViewerDestroy(viewer,ierr);CHKERRA(ierr)
 70:       call MatSetOption(A,MAT_SYMMETRIC,PETSC_TRUE,ierr);CHKERRA(ierr)
 71:       call MatSetOption(aux,MAT_SYMMETRIC,PETSC_TRUE,ierr);CHKERRA(ierr)
 72:       call KSPCreate(PETSC_COMM_WORLD,ksp,ierr);CHKERRA(ierr)
 73:       call KSPSetOperators(ksp,A,A,ierr);CHKERRA(ierr)
 74:       call KSPGetPC(ksp,pc,ierr);CHKERRA(ierr)
 75:       call PCSetType(pc,PCHPDDM,ierr);CHKERRA(ierr)
 76: #if defined(PETSC_HAVE_HPDDM)
 77:       call PCHPDDMSetAuxiliaryMat(pc,is,aux,PETSC_NULL_FUNCTION,PETSC_NULL_INTEGER,ierr);CHKERRA(ierr)
 78:       call PCHPDDMHasNeumannMat(pc,PETSC_FALSE,ierr);CHKERRA(ierr)
 79: #endif
 80:       call ISDestroy(is,ierr);CHKERRA(ierr)
 81:       call MatDestroy(aux,ierr);CHKERRA(ierr)
 82:       call KSPSetFromOptions(ksp,ierr);CHKERRA(ierr)
 83:       call MatCreateVecs(A,x,b,ierr);CHKERRA(ierr)
 84:       one = 1.0
 85:       call VecSet(b,one,ierr);CHKERRA(ierr)
 86:       call KSPSolve(ksp,b,x,ierr);CHKERRA(ierr)
 87:       call VecGetLocalSize(x,m,ierr);CHKERRA(ierr)
 88:       call VecDestroy(x,ierr);CHKERRA(ierr)
 89:       call VecDestroy(b,ierr);CHKERRA(ierr)
 90:       if (N .gt. 1) then
 91:         call PetscOptionsClearValue(PETSC_NULL_OPTIONS,'-ksp_converged_reason',ierr);CHKERRA(ierr)
 92:         call KSPSetFromOptions(ksp,ierr);CHKERRA(ierr)
 93:         call MatCreateDense(PETSC_COMM_WORLD,m,PETSC_DECIDE,PETSC_DECIDE,N,PETSC_NULL_SCALAR,C,ierr);CHKERRA(ierr)
 94:         call MatCreateDense(PETSC_COMM_WORLD,m,PETSC_DECIDE,PETSC_DECIDE,N,PETSC_NULL_SCALAR,Y,ierr);CHKERRA(ierr)
 95:         call MatSetRandom(C,PETSC_NULL_RANDOM,ierr);CHKERRA(ierr)
 96:         call KSPMatSolve(ksp,C,Y,ierr);CHKERRA(ierr)
 97:         call MatDestroy(Y,ierr);CHKERRA(ierr)
 98:         call MatDestroy(C,ierr);CHKERRA(ierr)
 99:       endif
100:       call KSPDestroy(ksp,ierr);CHKERRA(ierr)
101:       call MatDestroy(A,ierr);CHKERRA(ierr)
102:       call PetscFinalize(ierr)
103:       end

105: !/*TEST
106: !
107: !   test:
108: !      requires: hpddm slepc datafilespath double !complex !define(PETSC_USE_64BIT_INDICES)
109: !      output_file: output/ex76_1.out
110: !      nsize: 4
111: !      args: -ksp_rtol 1e-3 -ksp_converged_reason -pc_type {{bjacobi hpddm}shared output} -pc_hpddm_coarse_sub_pc_type lu -sub_pc_type lu -options_left no -load_dir ${DATAFILESPATH}/matrices/hpddm/GENEO
112: !
113: !   test:
114: !      requires: hpddm slepc datafilespath double !complex !define(PETSC_USE_64BIT_INDICES)
115: !      suffix: geneo
116: !      output_file: output/ex76_geneo_pc_hpddm_levels_1_eps_nev-5.out
117: !      nsize: 4
118: !      args: -ksp_converged_reason -pc_type hpddm -pc_hpddm_levels_1_sub_pc_type cholesky -pc_hpddm_levels_1_eps_nev 5 -pc_hpddm_levels_1_st_pc_type cholesky -pc_hpddm_coarse_p {{1 2}shared output} -pc_hpddm_coarse_pc_type redundant -load_dir ${DATAFILESPATH}/matrices/hpddm/GENEO
119: !
120: !   test:
121: !      requires: hpddm slepc datafilespath double !complex !define(PETSC_USE_64BIT_INDICES)
122: !      suffix: fgmres_geneo_20_p_2
123: !      output_file: output/ex76_fgmres_geneo_20_p_2.out
124: !      nsize: 4
125: !      args: -ksp_converged_reason -pc_type hpddm -pc_hpddm_levels_1_sub_pc_type lu -pc_hpddm_levels_1_eps_nev 20 -pc_hpddm_coarse_p 2 -pc_hpddm_coarse_pc_type redundant -ksp_type fgmres -pc_hpddm_coarse_mat_type {{baij sbaij}shared output} -load_dir ${DATAFILESPATH}/matrices/hpddm/GENEO
126: !
127: !   test:
128: !      requires: hpddm slepc datafilespath double !complex !define(PETSC_USE_64BIT_INDICES)
129: !      suffix: fgmres_geneo_20_p_2_geneo
130: !      output_file: output/ex76_fgmres_geneo_20_p_2.out
131: !      nsize: 4
132: !      args: -ksp_converged_reason -pc_type hpddm -pc_hpddm_levels_1_sub_pc_type cholesky -pc_hpddm_levels_1_eps_nev 20 -pc_hpddm_levels_2_p 2 -pc_hpddm_levels_2_mat_type {{baij sbaij}shared output} -pc_hpddm_levels_2_eps_nev {{5 20}shared output} -pc_hpddm_levels_2_sub_pc_type cholesky -pc_hpddm_levels_2_ksp_type gmres -ksp_type fgmres -pc_hpddm_coarse_mat_type {{baij sbaij}shared output} -load_dir ${DATAFILESPATH}/matrices/hpddm/GENEO
133: !   # PCHPDDM + KSPHPDDM test to exercise multilevel + multiple RHS in one go
134: !   test:
135: !      requires: hpddm slepc datafilespath double !complex !define(PETSC_USE_64BIT_INDICES)
136: !      suffix: fgmres_geneo_20_p_2_geneo_rhs
137: !      output_file: output/ex76_fgmres_geneo_20_p_2.out
138: !      nsize: 4
139: !      args: -ksp_converged_reason -pc_type hpddm -pc_hpddm_levels_1_sub_pc_type cholesky -pc_hpddm_levels_1_eps_nev 20 -pc_hpddm_levels_2_p 2 -pc_hpddm_levels_2_mat_type baij -pc_hpddm_levels_2_eps_nev 5 -pc_hpddm_levels_2_sub_pc_type cholesky -pc_hpddm_levels_2_ksp_max_it 10 -pc_hpddm_levels_2_ksp_type hpddm -pc_hpddm_levels_2_ksp_hpddm_type gmres -ksp_type hpddm -ksp_hpddm_variant flexible -pc_hpddm_coarse_mat_type baij -load_dir ${DATAFILESPATH}/matrices/hpddm/GENEO -rhs 4
140: !
141: !TEST*/