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!***********************************************************************
!
!
SUBROUTINE step_force(option)
!
!
!***********************************************************************
!
!
! Subroutine to compute gravitational potential and acceleration.
!
!
!=======================================================================
USE fly_h
implicit none
INCLUDE 'mpif.h'
! Declaration of local variables.
! -------------------------------
INTEGER :: ind_pe,istatus(MPI_STATUS_SIZE),tag0=0
CHARACTER(LEN=4) :: option
REAL(KIND=8) :: c0a,c1a,cta
!=======================================================================
c0a=MPI_WTIME()
CALL tree_build
c1a=MPI_WTIME()
cta=c1a-c0a
IF(me.eq.0) THEN
write(6,*) 'TREE_BUILD TOTAL: time in sec =',cta
call flush(uterm)
ENDIF
CALL MPI_BARRIER(MPI_COMM_WORLD,ierror)
!-----------------------------------------------------------------------------
! PUT 0 in acc array
!-----------------------------------------------------------------------------
acc=0.
CALL acc_comp(option)
CALL MPI_BARRIER(MPI_COMM_WORLD,ierror)
CALL acc_ex(option)
RETURN
END