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calc_dt.cuf
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calc_dt.cuf
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!Crown Copyright 2012 AWE.
!
! This file is part of CloverLeaf.
!
! CloverLeaf is free software: you can redistribute it and/or modify it under
! the terms of the GNU General Public License as published by the
! Free Software Foundation, either version 3 of the License, or (at your option)
! any later version.
!
! CloverLeaf is distributed in the hope that it will be useful, but
! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
! FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
! details.
!
! You should have received a copy of the GNU General Public License along with
! CloverLeaf. If not, see http://www.gnu.org/licenses/.
!> @brief Driver for the timestep kernels
!> @author Wayne Gaudin
!> @details Invokes the user specified timestep kernel.
MODULE calc_dt_module
CONTAINS
subroutine getMinDT(dt, a, xmin, xmax, ymin, ymax)
use cudafor
implicit none
real(8) :: dt
real(8), managed :: a(xmin-2:xmax+3, ymin-2:ymax+3)
integer :: xmin, xmax, ymin, ymax
integer :: j, k, istat
!$cuf kernel do(2) <<<*,*,stream=cudaGetStreamDefault()>>>
DO k=ymin,ymax
DO j=xmin,xmax
IF(a(j,k) .LT. dt) dt=a(j,k)
ENDDO
ENDDO
istat = cudaDeviceSynchronize()
if (istat /= cudaSuccess) write(*,*) 'Error in getMinDT: ', cudaGetErrorString(istat)
end subroutine getMinDT
SUBROUTINE calc_dt(chunk,local_dt,local_control,xl_pos,yl_pos,jldt,kldt)
USE clover_module
USE calc_dt_kernel_module
use cudafor
IMPLICIT NONE
INTEGER :: chunk
REAL(KIND=8) :: local_dt
CHARACTER(LEN=8) :: local_control
REAL(KIND=8) :: xl_pos,yl_pos
INTEGER :: jldt,kldt
INTEGER :: l_control
INTEGER :: j,k,small
type(dim3) :: dt_grid, dt_block
integer :: xmin, xmax, ymin, ymax, istat
real(kind=8) :: jk_control
local_dt=g_big
IF(chunks(chunk)%task.NE.parallel%task) RETURN
small = 0
if (use_cuda_fortran) then
xmin = chunks(chunk)%field%x_min
xmax = chunks(chunk)%field%x_max
ymin = chunks(chunk)%field%y_min
ymax = chunks(chunk)%field%y_max
dt_block = dim3(32,8,1)
dt_grid = dim3(ceiling((xmax-xmin+1.)/(dt_block%x)), ceiling((ymax-ymin+1.)/dt_block%y), 1)
CALL calc_dt_kernel_1<<<dt_grid, dt_block>>>(xmin, &
xmax, &
ymin, &
ymax, &
g_small, &
g_big, &
dtc_safe, &
dtu_safe, &
dtv_safe, &
dtdiv_safe, &
chunks(chunk)%field%xarea, &
chunks(chunk)%field%yarea, &
chunks(chunk)%field%celldx, &
chunks(chunk)%field%celldy, &
chunks(chunk)%field%volume, &
chunks(chunk)%field%density0, &
chunks(chunk)%field%viscosity, &
chunks(chunk)%field%soundspeed,&
chunks(chunk)%field%xvel0, &
chunks(chunk)%field%yvel0, &
chunks(chunk)%field%work_array1)
call getMinDT(local_dt, chunks(chunk)%field%work_array1, xmin, xmax, ymin, ymax)
small=0
jk_control=1.1
! Extract the mimimum timestep information
l_control=10.01*(jk_control-INT(jk_control))
jk_control=jk_control-(jk_control-INT(jk_control))
jldt=MOD(INT(jk_control),xmax)
kldt=1+(jk_control/xmax)
xl_pos=chunks(chunk)%field%cellx(jldt)
yl_pos=chunks(chunk)%field%celly(kldt)
IF(local_dt.LT.dtmin) small=1
IF(small.NE.0)THEN
WRITE(0,*) 'Timestep information:'
WRITE(0,*) 'j, k : ',jldt,kldt
WRITE(0,*) 'x, y : ',chunks(chunk)%field%cellx(jldt),chunks(chunk)%field%celly(kldt)
WRITE(0,*) 'timestep : ',local_dt
WRITE(0,*) 'Cell velocities;'
WRITE(0,*) chunks(chunk)%field%xvel0(jldt ,kldt ),chunks(chunk)%field%yvel0(jldt ,kldt )
WRITE(0,*) chunks(chunk)%field%xvel0(jldt+1,kldt ),chunks(chunk)%field%yvel0(jldt+1,kldt )
WRITE(0,*) chunks(chunk)%field%xvel0(jldt+1,kldt+1),chunks(chunk)%field%yvel0(jldt+1,kldt+1)
WRITE(0,*) chunks(chunk)%field%xvel0(jldt ,kldt+1),chunks(chunk)%field%yvel0(jldt ,kldt+1)
WRITE(0,*) 'density, energy, pressure, soundspeed '
WRITE(0,*) chunks(chunk)%field%density0(jldt,kldt), &
chunks(chunk)%field%energy0(jldt,kldt), &
chunks(chunk)%field%pressure(jldt,kldt), &
chunks(chunk)%field%soundspeed(jldt,kldt)
ENDIF
else
CALL calc_dt_kernel(chunks(chunk)%field%x_min, &
chunks(chunk)%field%x_max, &
chunks(chunk)%field%y_min, &
chunks(chunk)%field%y_max, &
g_small, &
g_big, &
dtmin, &
dtc_safe, &
dtu_safe, &
dtv_safe, &
dtdiv_safe, &
chunks(chunk)%field%xarea, &
chunks(chunk)%field%yarea, &
chunks(chunk)%field%cellx, &
chunks(chunk)%field%celly, &
chunks(chunk)%field%celldx, &
chunks(chunk)%field%celldy, &
chunks(chunk)%field%volume, &
chunks(chunk)%field%density0, &
chunks(chunk)%field%energy0, &
chunks(chunk)%field%pressure, &
chunks(chunk)%field%viscosity, &
chunks(chunk)%field%soundspeed,&
chunks(chunk)%field%xvel0, &
chunks(chunk)%field%yvel0, &
chunks(chunk)%field%work_array1,&
local_dt, &
l_control, &
xl_pos, &
yl_pos, &
jldt, &
kldt, &
small )
end if
IF(l_control.EQ.1) local_control='sound'
IF(l_control.EQ.2) local_control='xvel'
IF(l_control.EQ.3) local_control='yvel'
IF(l_control.EQ.4) local_control='div'
END SUBROUTINE calc_dt
END MODULE calc_dt_module