Actual source code: ex76f.F90
petsc-3.13.4 2020-08-01
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
12: KSP ksp
13: PC pc
14: IS is,sizes
15: PetscScalar one
16: PetscInt, pointer :: idx(:)
17: PetscMPIInt rank,size
18: PetscViewer viewer
19: character*(128) dir,name
20: character*(8) fmt
21: character(1) crank,csize
22: PetscBool flg
23: PetscErrorCode ierr
25: call PetscInitialize(PETSC_NULL_CHARACTER,ierr)
26: if (ierr .ne. 0) then
27: print *,'Unable to initialize PETSc'
28: stop
29: endif
30: call MPI_Comm_size(PETSC_COMM_WORLD,size,ierr)
31: if (size .ne. 4) then
32: print *,'This example requires 4 processes'
33: stop
34: endif
35: call MPI_Comm_rank(PETSC_COMM_WORLD,rank,ierr)
36: call MatCreate(PETSC_COMM_WORLD,A,ierr);CHKERRA(ierr)
37: call MatCreate(PETSC_COMM_SELF,aux,ierr);CHKERRA(ierr)
38: call ISCreate(PETSC_COMM_SELF,is,ierr);CHKERRA(ierr)
39: dir = '.'
40: call PetscOptionsGetString(PETSC_NULL_OPTIONS,PETSC_NULL_CHARACTER,'-load_dir',dir,flg,ierr);CHKERRA(ierr)
41: fmt = '(I1)'
42: write (crank,fmt) rank
43: write (csize,fmt) size
44: write (name,'(a)')trim(dir)//'/sizes_'//crank//'_'//csize//'.dat'
45: call PetscViewerBinaryOpen(PETSC_COMM_SELF,name,FILE_MODE_READ, viewer,ierr);CHKERRA(ierr)
46: call ISCreate(PETSC_COMM_SELF,sizes,ierr);CHKERRA(ierr)
47: call ISLoad(sizes,viewer,ierr);CHKERRA(ierr)
48: call ISGetIndicesF90(sizes,idx,ierr);CHKERRA(ierr)
49: call MatSetSizes(A,idx(1),idx(2),idx(3),idx(4),ierr);CHKERRA(ierr)
50: call ISRestoreIndicesF90(sizes,idx,ierr);CHKERRA(ierr)
51: call ISDestroy(sizes,ierr);CHKERRA(ierr)
52: call PetscViewerDestroy(viewer,ierr);CHKERRA(ierr)
53: call MatSetUp(A,ierr);CHKERRA(ierr)
54: write (name,'(a)')trim(dir)//'/A.dat'
55: call PetscViewerBinaryOpen(PETSC_COMM_WORLD,name,FILE_MODE_READ,viewer,ierr);CHKERRA(ierr)
56: call MatLoad(A,viewer,ierr);CHKERRA(ierr)
57: call PetscViewerDestroy(viewer,ierr);CHKERRA(ierr)
58: write (name,'(a)')trim(dir)//'/is_'//crank//'_'//csize//'.dat'
59: call PetscViewerBinaryOpen(PETSC_COMM_SELF,name,FILE_MODE_READ,viewer,ierr);CHKERRA(ierr)
60: call ISLoad(is,viewer,ierr);CHKERRA(ierr)
61: call PetscViewerDestroy(viewer,ierr);CHKERRA(ierr)
62: write (name,'(a)')trim(dir)//'/Neumann_'//crank//'_'//csize//'.dat'
63: call PetscViewerBinaryOpen(PETSC_COMM_SELF,name,FILE_MODE_READ,viewer,ierr);CHKERRA(ierr)
64: call MatSetBlockSizesFromMats(aux,A,A,ierr);CHKERRA(ierr)
65: call MatLoad(aux,viewer,ierr);CHKERRA(ierr)
66: call PetscViewerDestroy(viewer,ierr);CHKERRA(ierr)
67: call MatSetOption(A,MAT_SYMMETRIC,PETSC_TRUE,ierr);CHKERRA(ierr)
68: call MatSetOption(aux,MAT_SYMMETRIC,PETSC_TRUE,ierr);CHKERRA(ierr)
69: call KSPCreate(PETSC_COMM_WORLD,ksp,ierr);CHKERRA(ierr)
70: call KSPSetOperators(ksp,A,A,ierr);CHKERRA(ierr)
71: call KSPGetPC(ksp,pc,ierr);CHKERRA(ierr)
72: call PCSetType(pc,PCHPDDM,ierr);CHKERRA(ierr)
73: #if defined(PETSC_HAVE_HPDDM)
74: call PCHPDDMSetAuxiliaryMat(pc,is,aux,PETSC_NULL_FUNCTION,PETSC_NULL_INTEGER,ierr);CHKERRA(ierr)
75: call PCHPDDMHasNeumannMat(pc,PETSC_FALSE,ierr);CHKERRA(ierr)
76: #endif
77: call ISDestroy(is,ierr);CHKERRA(ierr)
78: call MatDestroy(aux,ierr);CHKERRA(ierr)
79: call KSPSetFromOptions(ksp,ierr);CHKERRA(ierr)
80: call MatCreateVecs(A,x,b,ierr);CHKERRA(ierr)
81: one = 1.0
82: call VecSet(b,one,ierr);CHKERRA(ierr)
83: call KSPSolve(ksp,b,x,ierr);CHKERRA(ierr)
84: call VecDestroy(x,ierr);CHKERRA(ierr)
85: call VecDestroy(b,ierr);CHKERRA(ierr)
86: call KSPDestroy(ksp,ierr);CHKERRA(ierr)
87: call MatDestroy(A,ierr);CHKERRA(ierr)
88: call PetscFinalize(ierr)
89: end
91: !/*TEST
92: !
93: ! test:
94: ! requires: hpddm slepc datafilespath double !complex !define(PETSC_USE_64BIT_INDICES)
95: ! output_file: output/ex76_1.out
96: ! nsize: 4
97: ! 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
98: !
99: ! test:
100: ! requires: hpddm slepc datafilespath double !complex !define(PETSC_USE_64BIT_INDICES)
101: ! suffix: geneo
102: ! output_file: output/ex76_geneo_pc_hpddm_levels_1_eps_nev-5.out
103: ! nsize: 4
104: ! 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
105: !
106: ! test:
107: ! requires: hpddm slepc datafilespath double !complex !define(PETSC_USE_64BIT_INDICES)
108: ! suffix: fgmres_geneo_20_p_2
109: ! output_file: output/ex76_fgmres_geneo_20_p_2.out
110: ! nsize: 4
111: ! 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
112: !
113: ! test:
114: ! requires: hpddm slepc datafilespath double !complex !define(PETSC_USE_64BIT_INDICES)
115: ! suffix: fgmres_geneo_20_p_2_geneo
116: ! output_file: output/ex76_fgmres_geneo_20_p_2.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 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
119: !
120: !TEST*/