hecmw_solver_las_22.F90

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!-------------------------------------------------------------------------------
! Copyright (c) 2019 FrontISTR Commons
! This software is released under the MIT License, see LICENSE.txt
!-------------------------------------------------------------------------------
 
module hecmw_solver_las_22
 
  private
 
  public :: hecmw_matvec_22
  public :: hecmw_matresid_22
  public :: hecmw_rel_resid_l2_22
 
contains
 
  !C
  !C***
  !C*** hecmw_matvec_22
  !C***
  !C
  subroutine hecmw_matvec_22 (hecMESH, hecMAT, X, Y, time_Ax, COMMtime)
    use hecmw_util
    use m_hecmw_comm_f
    use hecmw_jad_type
    use hecmw_tuning_fx
    !$ use omp_lib
 
    implicit none
    type (hecmwst_local_mesh), intent(in) :: hecmesh
    type (hecmwst_matrix), intent(in), target :: hecmat
    real(kind=kreal), intent(in) :: x(:)
    real(kind=kreal), intent(out) :: y(:)
    real(kind=kreal), intent(inout) :: time_ax
    real(kind=kreal), intent(inout), optional :: commtime
 
    real(kind=kreal) :: start_time, end_time, tcomm
    integer(kind=kint) :: i, j, js, je, in
    real(kind=kreal) :: yv1, yv2, x1, x2
 
    integer(kind=kint) :: n, np
    integer(kind=kint), pointer :: indexl(:), iteml(:), indexu(:), itemu(:), indexa(:), itema(:)
    real(kind=kreal), pointer :: al(:), au(:), d(:), a(:)
 
    ! added for tuning >>>
    integer, parameter :: numofblockperthread = 100
    logical, save :: isfirst = .true.
    integer, save :: numofthread = 1
    integer, save, allocatable :: startpos(:), endpos(:)
    integer(kind=kint), save :: sectorcachesize0, sectorcachesize1
    integer(kind=kint) :: threadnum, blocknum, numofblock
    integer(kind=kint) :: numofelement, elementcount, blockindex
    real(kind=kreal) :: numofelementperblock
    ! <<< added for tuning
 
    if (hecmw_jad_is_initialized().ne.0) then
      tcomm = 0.d0
      start_time = hecmw_wtime()
      call hecmw_jad_matvec(hecmesh, hecmat, x, y, tcomm)
      end_time = hecmw_wtime()
      time_ax = time_ax + end_time - start_time - tcomm
      if (present(commtime)) commtime = commtime + tcomm
    else
 
      n = hecmat%N
      np = hecmat%NP
      indexl => hecmat%indexL
      indexu => hecmat%indexU
      indexa => hecmat%indexA
      iteml => hecmat%itemL
      itemu => hecmat%itemU
      itema => hecmat%itemA
      al => hecmat%AL
      au => hecmat%AU
      d => hecmat%D
      a => hecmat%A
 
      ! added for tuning >>>
#ifndef _OPENACC
      if (.not. isfirst) then
        numofblock = numofthread * numofblockperthread
        if (endpos(numofblock-1) .ne. n-1) then
          deallocate(startpos, endpos)
          isfirst = .true.
        endif
      endif
      if (isfirst) then
        !$ numOfThread = omp_get_max_threads()
        numofblock = numofthread * numofblockperthread
        allocate (startpos(0 : numofblock - 1), endpos(0 : numofblock - 1))
        numofelement = n + indexl(n) + indexu(n)
        numofelementperblock = dble(numofelement) / numofblock
        blocknum = 0
        elementcount = 0
        startpos(blocknum) = 1
        do i= 1, n
          elementcount = elementcount + 1
          elementcount = elementcount + (indexl(i) - indexl(i-1))
          elementcount = elementcount + (indexu(i) - indexu(i-1))
          if (elementcount > (blocknum + 1) * numofelementperblock) then
            endpos(blocknum) = i
            blocknum = blocknum + 1
            startpos(blocknum) = i + 1
            if (blocknum == (numofblock - 1)) exit
          endif
        enddo
        endpos(blocknum) = n
        ! for irregular data
        do i= blocknum+1, numofblock-1
          startpos(i) = n
          endpos(i) = n-1
        end do
 
        call hecmw_tuning_fx_calc_sector_cache(np, 2, &
          sectorcachesize0, sectorcachesize1)
 
        isfirst = .false.
      endif
#endif
      ! <<< added for tuning
 
      start_time= hecmw_wtime()
      call hecmw_update_r (hecmesh, x, np, 2)
      end_time= hecmw_wtime()
      if (present(commtime)) commtime = commtime + end_time - start_time
 
      start_time = hecmw_wtime()
 
#ifdef _OPENACC
      !$acc kernels
      !$acc loop independent
      do i = 1,n
        x1= x(2*i-1)
        x2= x(2*i  )
        yv1= 0
        yv2= 0
        js= indexa(i-1) + 1
        je= indexa(i)
        do j= js, je
          in  = itema(j)
          x1 = x(2*in-1)
          x2 = x(2*in  )
          yv1= yv1 + a(4*j-3)*x1 + a(4*j-2)*x2
          yv2= yv2 + a(4*j-1)*x1 + a(4*j  )*x2
        enddo
        y(2*i-1)= yv1
        y(2*i  )= yv2
      enddo
      !$acc end kernels
#else
      !call fapp_start("loopInMatvec33", 1, 0)
      !call start_collection("loopInMatvec33")
 
      !OCL CACHE_SECTOR_SIZE(sectorCacheSize0,sectorCacheSize1)
      !OCL CACHE_SUBSECTOR_ASSIGN(X)
 
      !$OMP PARALLEL DEFAULT(NONE) &
        !$OMP&PRIVATE(i,X1,X2,YV1,YV2,jS,jE,j,in,threadNum,blockNum,blockIndex) &
        !$OMP&SHARED(D,AL,AU,indexL,itemL,indexU,itemU,X,Y,startPos,endPos,numOfThread,N)
      threadnum = 0
      !$ threadNum = omp_get_thread_num()
      do blocknum = 0 , numofblockperthread - 1
        blockindex = blocknum * numofthread  + threadnum
        do i = startpos(blockindex), endpos(blockindex)
          x1= x(2*i-1)
          x2= x(2*i  )
          yv1= d(4*i-3)*x1 + d(4*i-2)*x2
          yv2= d(4*i-1)*x1 + d(4*i  )*x2
 
          js= indexl(i-1) + 1
          je= indexl(i  )
          do j= js, je
            in  = iteml(j)
            x1 = x(2*in-1)
            x2 = x(2*in  )
            yv1= yv1 + al(4*j-3)*x1 + al(4*j-2)*x2
            yv2= yv2 + al(4*j-1)*x1 + al(4*j  )*x2
          enddo
          js= indexu(i-1) + 1
          je= indexu(i  )
          do j= js, je
            in  = itemu(j)
            x1 = x(2*in-1)
            x2 = x(2*in  )
            yv1= yv1 + au(4*j-3)*x1 + au(4*j-2)*x2
            yv2= yv2 + au(4*j-1)*x1 + au(4*j  )*x2
          enddo
          y(2*i-1)= yv1
          y(2*i  )= yv2
        enddo
      enddo
 
      !$OMP END PARALLEL
 
      !OCL END_CACHE_SUBSECTOR
      !OCL END_CACHE_SECTOR_SIZE
#endif
 
 
      end_time = hecmw_wtime()
      time_ax = time_ax + end_time - start_time
    endif
 
  end subroutine hecmw_matvec_22
 
 
 
 
 
 
  !C
  !C***
  !C*** hecmw_matresid_22
  !C***
  !C
  subroutine hecmw_matresid_22 (hecMESH, hecMAT, X, B, R, time_Ax, COMMtime)
    use hecmw_util
 
    implicit none
    real(kind=kreal) :: x(:), b(:), r(:)
    type (hecmwst_matrix)     :: hecmat
    type (hecmwst_local_mesh) :: hecmesh
    real(kind=kreal) :: time_ax
    real(kind=kreal), optional :: commtime
 
    integer(kind=kint) :: i
    real(kind=kreal) :: tcomm
 
    tcomm = 0.d0
    call hecmw_matvec_22 (hecmesh, hecmat, x, r, time_ax, tcomm)
    if (present(commtime)) commtime = commtime + tcomm
#ifdef _OPENACC
    !$acc kernels
    !$acc loop independent
#else
    !$omp parallel default(none),private(i),shared(hecMAT,R,B)
    !$omp do
#endif
    do i = 1, hecmat%N * 2
      r(i) = b(i) - r(i)
    enddo
#ifdef _OPENACC
    !$acc end kernels
#else
    !$omp end do
    !$omp end parallel
#endif
  end subroutine hecmw_matresid_22
 
  !C
  !C***
  !C*** hecmw_rel_resid_L2_22
  !C***
  !C
  function hecmw_rel_resid_l2_22 (hecMESH, hecMAT, time_Ax, COMMtime)
    use hecmw_util
    use hecmw_solver_misc
 
    implicit none
    real(kind=kreal) :: hecmw_rel_resid_l2_22
    type ( hecmwst_local_mesh ), intent(in) :: hecmesh
    type ( hecmwst_matrix     ), intent(in) :: hecmat
    real(kind=kreal) :: time_ax
    real(kind=kreal), optional :: commtime
 
    real(kind=kreal) :: r(hecmat%NDOF*hecmat%NP)
    real(kind=kreal) :: bnorm2, rnorm2
    real(kind=kreal) :: tcomm
 
    tcomm = 0.d0
    call hecmw_innerproduct_r(hecmesh, hecmat%NDOF, hecmat%B, hecmat%B, bnorm2, tcomm)
    if (bnorm2 == 0.d0) then
      bnorm2 = 1.d0
    endif
    call hecmw_matresid_22(hecmesh, hecmat, hecmat%X, hecmat%B, r, time_ax, tcomm)
    call hecmw_innerproduct_r(hecmesh, hecmat%NDOF, r, r, rnorm2, tcomm)
    if (present(commtime)) commtime = commtime + tcomm
 
    hecmw_rel_resid_l2_22 = sqrt(rnorm2 / bnorm2)
 
  end function hecmw_rel_resid_l2_22
 
end module hecmw_solver_las_22