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480 lines
14 KiB
Fortran
480 lines
14 KiB
Fortran
!
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program d_coo_matgen
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use psb_base_mod
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!!$ use psb_prec_mod
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!!$ use psb_krylov_mod
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use psb_d_base_mat_mod
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use psb_d_csr_mat_mod
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implicit none
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! input parameters
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character(len=20) :: kmethd, ptype
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character(len=5) :: afmt
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integer :: idim
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! miscellaneous
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real(psb_dpk_), parameter :: one = 1.d0
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real(psb_dpk_) :: t1, t2, tprec
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! sparse matrix and preconditioner
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type(psb_dspmat_type) :: a
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!!$ type(psb_dprec_type) :: prec
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! descriptor
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type(psb_desc_type) :: desc_a
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! dense matrices
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real(psb_dpk_), allocatable :: b(:), x(:)
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! blacs parameters
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integer :: ictxt, iam, np
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! solver parameters
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integer :: iter, itmax,itrace, istopc, irst
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integer(psb_long_int_k_) :: amatsize, precsize, descsize
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real(psb_dpk_) :: err, eps
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! other variables
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integer :: info, err_act
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character(len=20) :: name,ch_err
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info=psb_success_
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call psb_init(ictxt)
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call psb_info(ictxt,iam,np)
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if (iam < 0) then
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! This should not happen, but just in case
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call psb_exit(ictxt)
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stop
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endif
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if(psb_get_errstatus() /= 0) goto 9999
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call psb_set_errverbosity(2)
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!
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! get parameters
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!
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call get_parms(ictxt,idim)
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!
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! allocate and fill in the coefficient matrix, rhs and initial guess
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!
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call psb_barrier(ictxt)
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t1 = psb_wtime()
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call create_matrix(idim,a,b,x,desc_a,ictxt,afmt,info)
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call psb_barrier(ictxt)
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t2 = psb_wtime() - t1
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if(info /= psb_success_) then
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call psb_error(ictxt)
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end if
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call psb_exit(ictxt)
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stop
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9999 continue
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call psb_erractionrestore(err_act)
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if (err_act == psb_act_abort_) then
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call psb_error(ictxt)
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end if
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stop
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contains
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!
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! get iteration parameters from standard input
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!
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subroutine get_parms(ictxt,idim)
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integer :: ictxt
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integer :: idim
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integer :: np, iam
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integer :: intbuf(10), ip
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call psb_info(ictxt, iam, np)
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read(psb_inp_unit,*) idim
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return
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end subroutine get_parms
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!
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! print an error message
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!
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subroutine pr_usage(iout)
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integer :: iout
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write(iout,*)'incorrect parameter(s) found'
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write(iout,*)' usage: pde90 methd prec dim &
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&[istop itmax itrace]'
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write(iout,*)' where:'
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write(iout,*)' methd: cgstab cgs rgmres bicgstabl'
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write(iout,*)' prec : bjac diag none'
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write(iout,*)' dim number of points along each axis'
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write(iout,*)' the size of the resulting linear '
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write(iout,*)' system is dim**3'
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write(iout,*)' istop stopping criterion 1, 2 '
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write(iout,*)' itmax maximum number of iterations [500] '
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write(iout,*)' itrace <=0 (no tracing, default) or '
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write(iout,*)' >= 1 do tracing every itrace'
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write(iout,*)' iterations '
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end subroutine pr_usage
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!
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! subroutine to allocate and fill in the coefficient matrix and
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! the rhs.
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!
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subroutine create_matrix(idim,a,b,xv,desc_a,ictxt,afmt,info)
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!
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! discretize the partial diferential equation
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!
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! b1 dd(u) b2 dd(u) b3 dd(u) a1 d(u) a2 d(u) a3 d(u)
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! - ------ - ------ - ------ - ----- - ------ - ------ + a4 u
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! dxdx dydy dzdz dx dy dz
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!
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! with Dirichlet boundary conditions, on the unit cube 0<=x,y,z<=1.
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!
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! Boundary conditions are set in a very simple way, by adding
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! equations of the form
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!
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! u(x,y) = exp(-x^2-y^2-z^2)
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!
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! Note that if a1=a2=a3=a4=0., the PDE is the well-known Laplace equation.
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!
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use psb_base_mod
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!!$ use psb_d_base_mat_mod
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use psb_d_csr_mat_mod
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implicit none
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integer :: idim
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integer, parameter :: nb=20
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real(psb_dpk_), allocatable :: b(:),xv(:)
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type(psb_desc_type) :: desc_a
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integer :: ictxt, info
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character :: afmt*5
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type(psb_dspmat_type) :: a
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real(psb_dpk_) :: zt(nb),glob_x,glob_y,glob_z
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integer :: m,n,nnz,glob_row,nlr,i,ii,ib,k
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integer :: x,y,z,ia,indx_owner
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integer :: np, iam, nr, nt,nz,isz
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integer :: element
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integer, allocatable :: irow(:),icol(:),myidx(:)
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real(psb_dpk_), allocatable :: val(:)
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type(psb_d_coo_sparse_mat) :: acoo
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type(psb_d_csr_sparse_mat) :: acsr
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! deltah dimension of each grid cell
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! deltat discretization time
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real(psb_dpk_) :: deltah
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real(psb_dpk_),parameter :: rhs=0.d0,one=1.d0,zero=0.d0
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real(psb_dpk_) :: t0, t1, t2, t3, tasb, talc, ttot, tgen, tcpy, tmov
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real(psb_dpk_) :: a1, a2, a3, a4, b1, b2, b3
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external :: a1, a2, a3, a4, b1, b2, b3
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integer :: err_act
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character(len=20) :: name, ch_err, asbfmt
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info = psb_success_
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name = 'creatae_matrix'
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call psb_erractionsave(err_act)
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call psb_info(ictxt, iam, np)
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deltah = 1.d0/(idim-1)
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! initialize array descriptor and sparse matrix storage. provide an
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! estimate of the number of non zeroes
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m = idim*idim*idim
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n = m
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nnz = ((n*9)/(np))
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if(iam == psb_root_) write(psb_err_unit,'("Generating Matrix (size=",i0,")...")')n
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!
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! Using a simple BLOCK distribution.
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!
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nt = (m+np-1)/np
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nr = max(0,min(nt,m-(iam*nt)))
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nt = nr
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call psb_sum(ictxt,nt)
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if (nt /= m) write(psb_err_unit,*) iam, 'Initialization error ',nr,nt,m
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write(psb_err_unit,*) iam, 'Initialization ',nr,nt,m
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nlr = nt
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call psb_barrier(ictxt)
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call acoo%set_null()
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t0 = psb_wtime()
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call acoo%allocate(nr,nr)
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talc = psb_wtime()-t0
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!!$ write(psb_out_unit,*) 'Test get size:',d_coo_get_size(acoo)
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!!$ write(psb_out_unit,*) 'Test 2 get size:',acoo%get_size(),acoo%get_nzeros()
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if (info /= psb_success_) then
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info=psb_err_from_subroutine_
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ch_err='allocation rout.'
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call psb_errpush(info,name,a_err=ch_err)
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goto 9999
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end if
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! we build an auxiliary matrix consisting of one row at a
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! time; just a small matrix. might be extended to generate
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! a bunch of rows per call.
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!
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allocate(val(20*nb),irow(20*nb),&
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&icol(20*nb),myidx(nlr),stat=info)
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if (info /= psb_success_ ) then
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info=psb_err_alloc_dealloc_
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call psb_errpush(info,name)
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goto 9999
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endif
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! loop over rows belonging to current process in a block
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! distribution.
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call psb_barrier(ictxt)
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t1 = psb_wtime()
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do ii=1, nlr,nb
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ib = min(nb,nlr-ii+1)
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!!$ write(psb_err_unit,*) 'Row ',ii,ib
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element = 1
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do k=1,ib
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i=ii+k-1
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! local matrix pointer
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glob_row=i
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! compute gridpoint coordinates
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if (mod(glob_row,(idim*idim)) == 0) then
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x = glob_row/(idim*idim)
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else
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x = glob_row/(idim*idim)+1
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endif
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if (mod((glob_row-(x-1)*idim*idim),idim) == 0) then
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y = (glob_row-(x-1)*idim*idim)/idim
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else
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y = (glob_row-(x-1)*idim*idim)/idim+1
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endif
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z = glob_row-(x-1)*idim*idim-(y-1)*idim
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! glob_x, glob_y, glob_x coordinates
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glob_x=x*deltah
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glob_y=y*deltah
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glob_z=z*deltah
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! check on boundary points
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zt(k) = 0.d0
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! internal point: build discretization
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!
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! term depending on (x-1,y,z)
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!
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if (x == 1) then
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val(element)=-b1(glob_x,glob_y,glob_z)&
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& -a1(glob_x,glob_y,glob_z)
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val(element) = val(element)/(deltah*&
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& deltah)
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zt(k) = exp(-glob_y**2-glob_z**2)*(-val(element))
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else
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val(element)=-b1(glob_x,glob_y,glob_z)&
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& -a1(glob_x,glob_y,glob_z)
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val(element) = val(element)/(deltah*&
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& deltah)
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icol(element) = (x-2)*idim*idim+(y-1)*idim+(z)
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irow(element) = glob_row
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element = element+1
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endif
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! term depending on (x,y-1,z)
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if (y == 1) then
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val(element)=-b2(glob_x,glob_y,glob_z)&
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& -a2(glob_x,glob_y,glob_z)
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val(element) = val(element)/(deltah*&
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& deltah)
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zt(k) = exp(-glob_y**2-glob_z**2)*exp(-glob_x)*(-val(element))
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else
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val(element)=-b2(glob_x,glob_y,glob_z)&
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& -a2(glob_x,glob_y,glob_z)
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val(element) = val(element)/(deltah*&
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& deltah)
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icol(element) = (x-1)*idim*idim+(y-2)*idim+(z)
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irow(element) = glob_row
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element = element+1
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endif
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! term depending on (x,y,z-1)
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if (z == 1) then
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val(element)=-b3(glob_x,glob_y,glob_z)&
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& -a3(glob_x,glob_y,glob_z)
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val(element) = val(element)/(deltah*&
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& deltah)
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zt(k) = exp(-glob_y**2-glob_z**2)*exp(-glob_x)*(-val(element))
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else
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val(element)=-b3(glob_x,glob_y,glob_z)&
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& -a3(glob_x,glob_y,glob_z)
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val(element) = val(element)/(deltah*&
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& deltah)
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icol(element) = (x-1)*idim*idim+(y-1)*idim+(z-1)
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irow(element) = glob_row
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element = element+1
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endif
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! term depending on (x,y,z)
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val(element)=2*b1(glob_x,glob_y,glob_z)&
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& +2*b2(glob_x,glob_y,glob_z)&
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& +2*b3(glob_x,glob_y,glob_z)&
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& +a1(glob_x,glob_y,glob_z)&
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& +a2(glob_x,glob_y,glob_z)&
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& +a3(glob_x,glob_y,glob_z)
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val(element) = val(element)/(deltah*&
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& deltah)
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icol(element) = (x-1)*idim*idim+(y-1)*idim+(z)
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irow(element) = glob_row
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element = element+1
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! term depending on (x,y,z+1)
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if (z == idim) then
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val(element)=-b1(glob_x,glob_y,glob_z)
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val(element) = val(element)/(deltah*&
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& deltah)
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zt(k) = exp(-glob_y**2-glob_z**2)*exp(-glob_x)*(-val(element))
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else
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val(element)=-b1(glob_x,glob_y,glob_z)
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val(element) = val(element)/(deltah*&
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& deltah)
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icol(element) = (x-1)*idim*idim+(y-1)*idim+(z+1)
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irow(element) = glob_row
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element = element+1
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endif
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! term depending on (x,y+1,z)
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if (y == idim) then
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val(element)=-b2(glob_x,glob_y,glob_z)
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val(element) = val(element)/(deltah*&
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& deltah)
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zt(k) = exp(-glob_y**2-glob_z**2)*exp(-glob_x)*(-val(element))
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else
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val(element)=-b2(glob_x,glob_y,glob_z)
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val(element) = val(element)/(deltah*&
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& deltah)
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icol(element) = (x-1)*idim*idim+(y)*idim+(z)
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irow(element) = glob_row
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element = element+1
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endif
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! term depending on (x+1,y,z)
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if (x<idim) then
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val(element)=-b3(glob_x,glob_y,glob_z)
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val(element) = val(element)/(deltah*&
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& deltah)
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icol(element) = (x)*idim*idim+(y-1)*idim+(z)
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irow(element) = glob_row
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element = element+1
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endif
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end do
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call acoo%csput(element-1,irow,icol,val,1,nr,1,nr,info)
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end do
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tgen = psb_wtime()-t1
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if(info /= psb_success_) then
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info=psb_err_from_subroutine_
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ch_err='insert rout.'
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call psb_errpush(info,name,a_err=ch_err)
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goto 9999
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end if
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!!$ call acoo%print(19)
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t1 = psb_wtime()
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!!$ write(psb_err_unit,*) 'out of loop ',acoo%get_nzeros()
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call acoo%fix(info)
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!!$ write(psb_err_unit,*) '2 out of loop ',acoo%get_nzeros()
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if(info /= psb_success_) then
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info=psb_err_from_subroutine_
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ch_err='asb rout.'
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call psb_errpush(info,name,a_err=ch_err)
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goto 9999
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end if
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tasb = psb_wtime()-t1
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!!$ call acoo%print(20)
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t1 = psb_wtime()
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call acsr%cp_from_coo(acoo,info)
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if(info /= psb_success_) then
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info=psb_err_from_subroutine_
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ch_err='cp rout.'
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call psb_errpush(info,name,a_err=ch_err)
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goto 9999
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end if
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tcpy = psb_wtime()-t1
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!!$ call acsr%print(21)
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t1 = psb_wtime()
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call acsr%mv_from_coo(acoo,info)
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if(info /= psb_success_) then
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info=psb_err_from_subroutine_
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ch_err='mv rout.'
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call psb_errpush(info,name,a_err=ch_err)
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goto 9999
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end if
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tmov = psb_wtime()-t1
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!!$ call acsr%print(22)
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if(iam == psb_root_) then
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asbfmt = acsr%get_fmt()
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write(psb_out_unit,'("The matrix has been generated and assembled in ",a3," format.")')&
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& asbfmt
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write(psb_out_unit,'("-allocation time : ",es12.5)') talc
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write(psb_out_unit,'("-coeff. gen. time : ",es12.5)') tgen
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write(psb_out_unit,'("-assembly time : ",es12.5)') tasb
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write(psb_out_unit,'("-copy time : ",es12.5)') tcpy
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write(psb_out_unit,'("-move time : ",es12.5)') tmov
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!!$ write(psb_out_unit,'("-total time : ",es12.5)') ttot
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end if
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call psb_erractionrestore(err_act)
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return
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9999 continue
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call psb_erractionrestore(err_act)
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if (err_act == psb_act_abort_) then
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call psb_error(ictxt)
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return
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end if
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return
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end subroutine create_matrix
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end program d_coo_matgen
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!
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! functions parametrizing the differential equation
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!
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function a1(x,y,z)
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use psb_base_mod, only : psb_dpk_
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real(psb_dpk_) :: a1
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real(psb_dpk_) :: x,y,z
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a1=1.d0
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end function a1
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function a2(x,y,z)
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use psb_base_mod, only : psb_dpk_
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real(psb_dpk_) :: a2
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real(psb_dpk_) :: x,y,z
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a2=2.d1*y
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end function a2
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function a3(x,y,z)
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use psb_base_mod, only : psb_dpk_
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real(psb_dpk_) :: a3
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real(psb_dpk_) :: x,y,z
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a3=1.d0
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end function a3
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function a4(x,y,z)
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use psb_base_mod, only : psb_dpk_
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real(psb_dpk_) :: a4
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real(psb_dpk_) :: x,y,z
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a4=1.d0
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end function a4
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function b1(x,y,z)
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use psb_base_mod, only : psb_dpk_
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real(psb_dpk_) :: b1
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real(psb_dpk_) :: x,y,z
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b1=1.d0
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end function b1
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function b2(x,y,z)
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use psb_base_mod, only : psb_dpk_
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real(psb_dpk_) :: b2
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real(psb_dpk_) :: x,y,z
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b2=1.d0
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end function b2
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function b3(x,y,z)
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use psb_base_mod, only : psb_dpk_
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real(psb_dpk_) :: b3
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real(psb_dpk_) :: x,y,z
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b3=1.d0
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end function b3
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