psblas3/test/kernel/pdgenspmv.f90

!!$  
!!$              Parallel Sparse BLAS  version 3.4.1
!!$    (C) Copyright 2015
!!$                       Salvatore Filippone    University of Rome Tor Vergata
!!$                       Alfredo Buttari        CNRS-IRIT, Toulouse
!!$ 
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!!$  
! File: ppde.f90
!
program pdgenspmv
  use psb_base_mod
  use psb_util_mod
  implicit none

  ! input parameters
  character(len=20) :: kmethd, ptype
  character(len=5)  :: afmt
  integer(psb_ipk_) :: idim

  ! miscellaneous 
  real(psb_dpk_), parameter :: one = 1.d0
  real(psb_dpk_) :: t1, t2, tprec, flops, tflops, tt1, tt2, bdwdth

  ! sparse matrix and preconditioner
  type(psb_dspmat_type) :: a
  ! descriptor
  type(psb_desc_type)   :: desc_a
  ! dense matrices
  type(psb_d_vect_type)  :: xv,bv, vtst
  real(psb_dpk_), allocatable :: tst(:)
  ! blacs parameters
  integer(psb_ipk_) :: ictxt, iam, np

  ! solver parameters
  integer(psb_ipk_) :: iter, itmax,itrace, istopc, irst, nr
  integer(psb_long_int_k_) :: amatsize, precsize, descsize, d2size, annz, nbytes
  real(psb_dpk_)   :: err, eps
  integer(psb_ipk_), parameter :: times=10

  ! other variables
  integer(psb_ipk_) :: info, i
  character(len=20)  :: name,ch_err
  character(len=40)  :: fname

  info=psb_success_

  
  call psb_init(ictxt)
  call psb_info(ictxt,iam,np)

  if (iam < 0) then 
    ! This should not happen, but just in case
    call psb_exit(ictxt)
    stop
  endif
  if(psb_get_errstatus() /= 0) goto 9999
  name='pde90'
  call psb_set_errverbosity(itwo)
  !
  ! Hello world
  !
  if (iam == psb_root_) then 
    write(*,*) 'Welcome to PSBLAS version: ',psb_version_string_
    write(*,*) 'This is the ',trim(name),' sample program'
  end if
  !
  !  get parameters
  !
  call get_parms(ictxt,afmt,idim)

  !
  !  allocate and fill in the coefficient matrix, rhs and initial guess 
  !
  call psb_barrier(ictxt)
  t1 = psb_wtime()
  call psb_gen_pde3d(ictxt,idim,a,bv,xv,desc_a,afmt,&
       & a1,a2,a3,b1,b2,b3,c,g,info)  
  call psb_barrier(ictxt)
  t2 = psb_wtime() - t1
  if(info /= psb_success_) then
    info=psb_err_from_subroutine_
    ch_err='psb_gen_pde3d'
    call psb_errpush(info,name,a_err=ch_err)
    goto 9999
  end if
  if (iam == psb_root_) write(psb_out_unit,'("Overall matrix creation time : ",es12.5)')t2
  if (iam == psb_root_) write(psb_out_unit,'(" ")')

  call xv%set(done)

  call psb_barrier(ictxt)
  t1 = psb_wtime()
  do i=1,times 
    call psb_spmm(done,a,xv,dzero,bv,desc_a,info,'n')
  end do
  call psb_barrier(ictxt)
  t2 = psb_wtime() - t1
  call psb_amx(ictxt,t2)

  ! FIXME: cache flush needed here
  call psb_barrier(ictxt)
  tt1 = psb_wtime()
  do i=1,times 
    call psb_spmm(done,a,xv,dzero,bv,desc_a,info,'t')
  end do
  call psb_barrier(ictxt)
  tt2 = psb_wtime() - tt1
  call psb_amx(ictxt,tt2)

  call psb_amx(ictxt,t2)
  nr       = desc_a%get_global_rows() 
  annz     = a%get_nzeros()
  amatsize = a%sizeof()
  descsize = psb_sizeof(desc_a)
  call psb_sum(ictxt,annz)
  call psb_sum(ictxt,amatsize)
  call psb_sum(ictxt,descsize)

  if (iam == psb_root_) then
    flops = 2.d0*times*annz
    tflops=flops
    write(psb_out_unit,'("Matrix: ell1 ",i0)') idim
    write(psb_out_unit,'("Test on                          : ",i20," processors")') np
    write(psb_out_unit,'("Size of matrix                   : ",i20,"           ")') nr
    write(psb_out_unit,'("Number of nonzeros               : ",i20,"           ")') annz
    write(psb_out_unit,'("Memory occupation                : ",i20,"           ")') amatsize
    write(psb_out_unit,'("Number of flops (",i0," prod)        : ",F20.0,"           ")') times,flops
    flops = flops / (t2)
    tflops = tflops / (tt2)
    write(psb_out_unit,'("Time for ",i0," products (s)         : ",F20.3)')times, t2
    write(psb_out_unit,'("Time per product    (ms)         : ",F20.3)') t2*1.d3/(1.d0*times)
    write(psb_out_unit,'("MFLOPS                           : ",F20.3)') flops/1.d6

    write(psb_out_unit,'("Time for ",i0," products (s) (trans.): ",F20.3)') times,tt2
    write(psb_out_unit,'("Time per product    (ms) (trans.): ",F20.3)') tt2*1.d3/(1.d0*times)
    write(psb_out_unit,'("MFLOPS                   (trans.): ",F20.3)') tflops/1.d6

    !
    ! This computation is valid for CSR
    !
    nbytes = nr*(2*psb_sizeof_dp + psb_sizeof_int)+&
         & annz*(psb_sizeof_dp + psb_sizeof_int)
    bdwdth = times*nbytes/(t2*1.d6)
    write(psb_out_unit,*)
    write(psb_out_unit,'("MBYTES/S                         : ",F20.3)') bdwdth
    bdwdth = times*nbytes/(tt2*1.d6)
    write(psb_out_unit,'("MBYTES/S                  (trans): ",F20.3)') bdwdth
    write(psb_out_unit,'("Storage type for DESC_A: ",a)') desc_a%get_fmt()
    write(psb_out_unit,'("Total memory occupation for DESC_A: ",i12)')descsize
    
  end if
  

  !  
  !  cleanup storage and exit
  !
  call psb_gefree(bv,desc_a,info)
  call psb_gefree(xv,desc_a,info)
  call psb_spfree(a,desc_a,info)
  call psb_cdfree(desc_a,info)
  if(info /= psb_success_) then
    info=psb_err_from_subroutine_
    ch_err='free routine'
    call psb_errpush(info,name,a_err=ch_err)
    goto 9999
  end if

  call psb_exit(ictxt)
  stop

9999 call psb_error(ictxt)

  stop

contains
  !
  ! get iteration parameters from standard input
  !
  subroutine  get_parms(ictxt,afmt,idim)
    integer(psb_ipk_) :: ictxt
    character(len=*) :: afmt
    integer(psb_ipk_) :: idim
    integer(psb_ipk_) :: np, iam
    integer(psb_ipk_) :: intbuf(10), ip

    call psb_info(ictxt, iam, np)

    if (iam == 0) then
      read(psb_inp_unit,*) afmt
      read(psb_inp_unit,*) idim
    endif
    call psb_bcast(ictxt,afmt)
    call psb_bcast(ictxt,idim)
    
    if (iam == 0) then
      write(psb_out_unit,'("Testing matrix       : ell1")')      
      write(psb_out_unit,'("Grid dimensions      : ",i4,"x",i4,"x",i4)')idim,idim,idim
      write(psb_out_unit,'("Number of processors : ",i0)')np
      write(psb_out_unit,'("Data distribution    : BLOCK")')
      write(psb_out_unit,'(" ")')
    end if
    return

  end subroutine get_parms
  !
  !  print an error message 
  !  
  subroutine pr_usage(iout)
    integer(psb_ipk_) :: iout
    write(iout,*)'incorrect parameter(s) found'
    write(iout,*)' usage:  pde90 methd prec dim &
         &[istop itmax itrace]'  
    write(iout,*)' where:'
    write(iout,*)'     methd:    cgstab cgs rgmres bicgstabl' 
    write(iout,*)'     prec :    bjac diag none'
    write(iout,*)'     dim       number of points along each axis'
    write(iout,*)'               the size of the resulting linear '
    write(iout,*)'               system is dim**3'
    write(iout,*)'     istop     stopping criterion  1, 2  '
    write(iout,*)'     itmax     maximum number of iterations [500] '
    write(iout,*)'     itrace    <=0  (no tracing, default) or '  
    write(iout,*)'               >= 1 do tracing every itrace'
    write(iout,*)'               iterations ' 
  end subroutine pr_usage

  !
  ! functions parametrizing the differential equation 
  !  
  function b1(x,y,z)
    use psb_base_mod, only : psb_dpk_
    real(psb_dpk_) :: b1
    real(psb_dpk_), intent(in) :: x,y,z
    b1=1.d0/sqrt(3.d0)
  end function b1
  function b2(x,y,z)
    use psb_base_mod, only : psb_dpk_
    real(psb_dpk_) ::  b2
    real(psb_dpk_), intent(in) :: x,y,z
    b2=1.d0/sqrt(3.d0)
  end function b2
  function b3(x,y,z)
    use psb_base_mod, only : psb_dpk_
    real(psb_dpk_) ::  b3
    real(psb_dpk_), intent(in) :: x,y,z      
    b3=1.d0/sqrt(3.d0)
  end function b3
  function c(x,y,z)
    use psb_base_mod, only : psb_dpk_
    real(psb_dpk_) ::  c
    real(psb_dpk_), intent(in) :: x,y,z      
    c=0.d0
  end function c
  function a1(x,y,z)
    use psb_base_mod, only : psb_dpk_
    real(psb_dpk_) ::  a1   
    real(psb_dpk_), intent(in) :: x,y,z
    a1=1.d0/80
  end function a1
  function a2(x,y,z)
    use psb_base_mod, only : psb_dpk_
    real(psb_dpk_) ::  a2
    real(psb_dpk_), intent(in) :: x,y,z
    a2=1.d0/80
  end function a2
  function a3(x,y,z)
    use psb_base_mod, only : psb_dpk_
    real(psb_dpk_) ::  a3
    real(psb_dpk_), intent(in) :: x,y,z
    a3=1.d0/80
  end function a3
  function g(x,y,z)
    use psb_base_mod, only : psb_dpk_, done
    real(psb_dpk_) ::  g
    real(psb_dpk_), intent(in) :: x,y,z
    g = dzero
    if (x == done) then
      g = done
    else if (x == dzero) then 
      g = exp(y**2-z**2)
    end if
  end function g
end program pdgenspmv