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!! @author Charles F. Vardeman II |
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!! @author Matthew Meineke |
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!! @author J. Daniel Gezelter |
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!! @version $Id: neighborLists.F90,v 1.2 2005-01-12 22:40:45 gezelter Exp $, |
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!! @version $Id: neighborLists.F90,v 1.5 2006-05-17 19:54:26 gezelter Exp $, |
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module neighborLists |
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use definitions |
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#ifdef IS_MPI |
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use mpiSimulation |
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#endif |
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implicit none |
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PRIVATE |
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!--------------MODULE VARIABLES----------------------> |
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!! Parameter for size > # of long range particles neighbor list |
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!! should be. |
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integer, parameter :: listMultiplier = 80 |
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!! Maximum number of times we should reallocate neighbor list. |
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integer, parameter :: maxAllocations = 5 |
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integer, parameter :: maxAllocations = 10 |
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!! Number of times we have allocated the neighbor list. |
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integer, save :: nAllocations = 0 |
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!! Pointer array to location in list for atom i. |
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public :: checkNeighborList |
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public :: saveNeighborList |
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public :: getNeighborListSize |
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contains |
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if (alloc_error /= 0) then |
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write(default_error,*) & |
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"ExpandNeighborLists: Error in allocating MPI point" |
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error = -1 |
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error = -1 |
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return |
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end if |
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allocate(list(listMultiplier * getNgroupsInCol(plan_group_col)),stat=alloc_error) |
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return |
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end if |
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#endif !! //MPI |
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! Expand the neighbor list |
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! Check to see if we have exceeded the maximum number of allocations. |
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if (nAllocations > maxAllocations) then |
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write(default_error,*) & |
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newSize = listMultiplier * nGroups + oldSize |
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#endif !! MPI |
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allocate(newList(newSize), stat=alloc_error) |
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if (alloc_error /= 0) then |
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write(*,*) "Error allocating new neighborlist" |
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error = -1 |
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return |
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end if |
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!! Point list at new list |
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list => newList |
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end if |
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nAllocations = nAllocations + 1 |
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listSize = size(list) |
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end subroutine expandNeighborList |
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!! checks to see if any long range particle has moved |
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!! through the neighbor list skin thickness. |
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subroutine checkNeighborList(nGroups, q, listSkin, update_nlist) |
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dispmx = 0.0E0_DP |
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!! calculate the largest displacement of any atom in any direction |
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!! If we have changed the particle idents, then we need to update |
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if (.not. allocated(q0)) then |
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update_nlist = .true. |
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#ifdef MPI |
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dispmx_tmp = 0.0E0_DP |
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do i = 1, nGroups |
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dispmx_tmp = max( abs ( q(1,i) - q0(1,i) ), dispmx_tmp ) |
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dispmx_tmp = max( abs ( q(2,i) - q0(2,i) ), dispmx_tmp ) |
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dispmx_tmp = max( abs ( q(3,i) - q0(3,i) ), dispmx_tmp ) |
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end do |
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#ifdef SINGLE_PRECISION |
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call mpi_allreduce(dispmx_tmp,dispmx,1,mpi_real, & |
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mpi_max,mpi_comm_world,mpi_err) |
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#else |
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call mpi_allreduce(dispmx_tmp,dispmx,1,mpi_double_precision, & |
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mpi_max,mpi_comm_world,mpi_err) |
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#endif |
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#else |
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dispmx = 0.0_DP |
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do i = 1, nGroups |
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dispmx = max( abs ( q(1,i) - q0(1,i) ), dispmx ) |
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dispmx = 2.0E0_DP * sqrt (3.0E0_DP * dispmx * dispmx) |
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update_nlist = (dispmx.gt.listSkin) |
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end subroutine checkNeighborList |
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end subroutine checkNeighborList |
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!! Saves neighbor list for comparison in check. |
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!! Save_neighborList will work even if the number of |
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!! local atoms has changed. |
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integer :: nGroups |
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real(kind = dp ), dimension(3,nGroups), intent(in) :: q |
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integer :: list_size |
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!! get size of list |
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list_size = nGroups |
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if (.not. allocated(q0)) then |
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allocate(q0(3,list_size)) |
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else if( list_size > size(q0,2)) then |
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endif |
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q0 = q |
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end subroutine saveNeighborList |
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function getNeighborListSize() result(returnListSize) |
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integer :: returnListSize |
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returnListSize = listSize |
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end function getNeighborListSize |
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end module neighborLists |
