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!! MPI support for long range forces using force decomposition |
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!! on a square grid of processors. |
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!! Corresponds to mpiSimunation.cpp for C++ |
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!! mpi_module also contains a private interface for mpi f90 routines. |
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!! |
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!! @author Charles F. Vardeman II |
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!! @author Matthew Meineke |
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!! @version $Id: mpiSimulation.F90,v 1.1 2002-12-13 16:51:23 chuckv Exp $, $Date: 2002-12-13 16:51:23 $, $Name: not supported by cvs2svn $, $Revision: 1.1 $ |
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module mpiSimulation |
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#ifdef MPI |
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use mpi |
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implicit none |
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PRIVATE |
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|
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!! PUBLIC Subroutines contained in this module |
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!! gather and scatter are a generic interface |
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!! to gather and scatter routines |
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public :: gather, scatter |
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public :: setupSimParallel |
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!! PUBLIC Subroutines contained in MPI module |
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public :: mpi_bcast |
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public :: mpi_allreduce |
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public :: mpi_reduce |
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public :: mpi_send |
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public :: mpi_recv |
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public :: mpi_get_processor_name |
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public :: mpi_finalize |
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|
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!! PUBLIC mpi variables |
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public :: mpi_comm_world |
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public :: mpi_character |
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public :: mpi_integer |
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public :: mpi_double_precision |
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public :: mpi_sum |
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public :: mpi_max |
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public :: mpi_status_size |
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public :: mpi_any_source |
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|
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!! Safety logical to prevent access to ComponetPlan until |
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!! set by C++. |
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logical :: ComponentPlanSet = .false. |
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|
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!! generic mpi error declaration. |
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integer,public :: mpi_err |
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|
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!! Include mpiComponentPlan type. mpiComponentPlan is a |
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!! dual header file for both c and fortran. |
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#define __FORTRAN90 |
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#include "mpiComponentPlan.h" |
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|
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!! gs_plan contains plans for gather and scatter routines |
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type, public :: gs_plan |
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private |
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type (mpiComponentPlan), pointer :: gsComponentPlan |
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! integer :: me, nprocs, n_datum,full_size !n = # of datums on local proc |
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integer, dimension(:), pointer :: displs |
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integer, dimension(:), pointer :: counts |
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integer :: planComm !! Communicator for this plan |
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end type gs_plan |
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|
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! plans for different decompositions |
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type (gs_plan), public :: plan_row |
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type (gs_plan), public :: plan_row3d |
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type (gs_plan), public :: plan_col |
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type (gs_plan), public :: plan_col3d |
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|
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type (mpiComponentPlan), pointer :: simComponentPlan |
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! interface for gather scatter routines |
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!! Generic interface for gather. |
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!! Gathers an local array into row or column array |
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!! Interface provided for integer, double and double |
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!! rank 2 arrays. |
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interface gather |
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module procedure gather_integer |
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module procedure gather_double |
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module procedure gather_double_2d |
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end interface |
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|
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!! Generic interface for scatter. |
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!! Scatters a row or column array, adding componets |
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!! and reducing them to a local nComponent array. |
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!! Interface provided for double and double rank=2 arrays. |
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interface scatter |
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module procedure scatter_double |
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module procedure scatter_double_2d |
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end interface |
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contains |
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!! Sets up mpiComponentPlan with structure passed from C++. |
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subroutine setupSimParallel(nDim,thisComponentPlan) |
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! Passed Arguments |
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integer, intent(inout) :: nDim !! Number of dimensions |
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!! mpiComponentPlan struct from C |
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type (mpiComponentPlan), intent(inout) :: thisComponentPlan |
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integer :: status |
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if (componentPlanSet) return |
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componentPlanSet = .true. |
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call make_Force_Grid(thisComponentPlan,status) |
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call updateGriComponents(thisComponentPlan,status) |
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call plan_gather_scatter(1,thisComponentPlan,row_comm,plan_row) |
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call plan_gather_scatter(nDim,thisComponentPlan,row_comm,plan_row3d) |
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call plan_gather_scatter(1,thisComponentPlan,col_comm,plan_col) |
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call plan_gather_scatte(nDim,thisComponentPlan,col_comm,plan_col3d) |
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end subroutine setupSimParallel |
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|
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!! Updates number of row and column components for long range forces. |
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subroutine updateGridComponents(thisComponentPlan,status) |
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type (mpiComponentPlan) :: thisComponentPlan !! mpiComponentPlan |
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!! Status return |
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!! - 0 Success |
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!! - -1 Failure |
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integer, intent(out) :: status |
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integer :: nComponentsLocal |
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integer :: nComponentsRow = 0 |
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integer :: nComponensColumn = 0 |
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integer :: mpiErrors |
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status = 0 |
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if (.not. componentPlanSet) return |
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if (thisComponentPlan%myNlocal == 0 ) then |
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status = -1 |
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return |
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endif |
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nComponentsLocal = thisComponentPlan%myNlocal |
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|
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call mpi_allreduce(nComponentsLocal,nComponentsRow,1,mpi_integer,& |
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mpi_sum,thisComponentPlan%rowComm,mpiError) |
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if (mpiErrors /= 0) then |
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status = -1 |
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return |
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endif |
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call mpi_allreduce(nComponentsLocal,nComponentsColumn,1,mpi_integer, & |
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mpi_sum,thisComponentPlan%columnComm,mpiError) |
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if (mpiErrors /= 0) then |
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status = -1 |
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return |
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endif |
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thisComponentPlan%nComponentsRow = nComponentsRow |
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thisComponentPlan%nComponentsColumn = nComponentsColumn |
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end subroutine updateGridComponents |
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!! Creates a square force decomposition of processors into row and column |
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!! communicators. |
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subroutine make_Force_Grid(thisComponentPlan,status) |
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type (mpiComponentPlan) :: thisComponentPlan |
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integer, intent(out) :: status !! status returns -1 if error |
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integer :: nColumnsMax !! Maximum number of columns |
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integer :: nWorldProcessors !! Total number of processors in World comm. |
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integer :: rowIndex !! Row for this processor. |
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integer :: columnIndex !! Column for this processor. |
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integer :: nRows !! Total number of rows. |
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integer :: nColumns !! Total number of columns. |
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integer :: mpiErrors !! MPI errors. |
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integer :: rowCommunicator !! MPI row communicator. |
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integer :: columnCommunicator |
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integer :: myWorldRank |
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integer :: i |
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if (.not. ComponentPlanSet) return |
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status = 0 |
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!! We make a dangerous assumption here that if numberProcessors is |
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!! zero, then we need to get the information from MPI. |
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if (thisComponentPlan%numberProcessors == 0 ) then |
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call mpi_comm_size( MPI_COMM_WORLD, nWorldProcessors,mpiErrors) |
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if ( mpiErrors /= 0 ) then |
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status = -1 |
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return |
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endif |
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call mpi_comm_rank( MPI_COMM_WORLD,myWorldRank,mpiErrors) |
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if ( mpiErrors /= 0 ) then |
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status = -1 |
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return |
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endif |
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else |
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nWorldProcessors = thisComponentPlan%numberProcessors |
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myWorldRank = thisComponentPlan%myRank |
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endif |
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nColumnsMax = nint(sqrt(real(nWorldProcessors,kind=dp))) |
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do i = 1, nColumnsMax |
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if (mod(nWorldProcessors,i) == 0) nColumns = i |
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end do |
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nRows = nWorldProcessors/nColumns |
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rowIndex = myWorldRank/nColumns |
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call mpi_comm_split(mpi_comm_world,rowIndex,0,rowCommunicator,mpiError) |
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if ( mpiErrors /= 0 ) then |
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status = -1 |
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return |
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endif |
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|
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columnIndex = mod(myWorldRank,nColumns) |
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call mpi_comm_split(mpi_comm_world,columnIndex,0,columnCommunicator,mpiError) |
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if ( mpiErrors /= 0 ) then |
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status = -1 |
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return |
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endif |
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! Set appropriate components of thisComponentPlan |
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thisComponentPlan%rowComm = rowCommunicator |
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thisComponentPlan%columnComm = columnCommunicator |
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thisComponentPlan%rowIndex = rowIndex |
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thisComponentPlan%columnIndex = columnIndex |
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thisComponentPlan%numberRows = nRows |
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thisComponentPlan%numberColumns = nColumns |
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end subroutine make_Force_Grid |
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!! initalizes a gather scatter plan |
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subroutine plan_gather_scatter( nDim,thisComponentPlan, & |
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thisComm, this_plan) |
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integer, intent(in) :: nDim !! Number of dimensions for gather scatter plan |
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type (mpiComponentPlan), intent(in) :: thisComponentPlan |
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type (gs_plan), intent(out) :: this_plan !! MPI Component Plan |
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integer, intent(in) :: thisComm !! |
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integer :: sizeof_int |
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integer :: ierror |
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integer :: comm |
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integer :: me |
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integer :: comm_procs |
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integer :: i,junk |
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integer :: number_of_particles |
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number_of_particles = 0 |
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call mpi_comm_dup(orig_comm,comm,mpi_err) |
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call mpi_comm_rank(comm,me,mpi_err) |
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call mpi_comm_size(comm,comm_procs,mpi_err) |
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sizeof_int = selected_int_kind(4) |
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allocate (this_plan%counts(0:comm_procs-1),STAT=ierror) |
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if (ierror /= 0) then |
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end if |
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allocate (this_plan%displs(0:comm_procs-1),STAT=ierror) |
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if (ierror /= 0) then |
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end if |
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call mpi_allgather(local_number,1,mpi_integer,this_plan%counts, & |
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1,mpi_integer,comm,mpi_err) |
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!! figure out the total number of particles in this plan |
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number_of_particles = sum(this_plan%counts) |
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!initialize plan |
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this_plan%displs(0) = 0 |
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do i = 1, comm_procs - 1,1 |
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this_plan%displs(i) = this_plan%displs(i-1) + this_plan%counts(i-1) |
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end do |
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this_plan%me = me |
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this_plan%nprocs = comm_procs |
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this_plan%full_size = number_of_particles |
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this_plan%comm = comm |
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this_plan%n_datum = local_number |
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|
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end subroutine plan_gather_scatter |
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subroutine unplan_gather_scatter(this_plan) |
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type (gs_plan), intent(inout) :: this_plan |
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call mpi_comm_free(this_plan%comm,mpi_err) |
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deallocate(this_plan%counts) |
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deallocate(this_plan%displs) |
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end subroutine unplan_gather_scatter |
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subroutine gather_integer( sbuffer, rbuffer, this_plan, status) |
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|
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type (gs_plan), intent(in) :: this_plan |
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integer, dimension(:), intent(in) :: sbuffer |
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integer, dimension(:), intent(in) :: rbuffer |
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integer :: noffset |
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integer, intent(out), optional :: status |
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if (present(status)) status = 0 |
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noffset = this_plan%displs(this_plan%me) |
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call mpi_allgatherv(sbuffer,this_plan%n_datum, mpi_integer, & |
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rbuffer,this_plan%counts,this_plan%displs,mpi_integer, & |
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this_plan%comm, mpi_err) |
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|
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if (mpi_err /= 0) then |
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if (present(status)) status = -1 |
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endif |
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|
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end subroutine gather_integer |
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|
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subroutine gather_double( sbuffer, rbuffer, this_plan, status) |
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|
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type (gs_plan), intent(in) :: this_plan |
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real( kind = DP ), dimension(:), intent(in) :: sbuffer |
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real( kind = DP ), dimension(:), intent(in) :: rbuffer |
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integer :: noffset |
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integer, intent(out), optional :: status |
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|
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if (present(status)) status = 0 |
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noffset = this_plan%displs(this_plan%me) |
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|
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call mpi_allgatherv(sbuffer,this_plan%n_datum, mpi_double_precision, & |
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rbuffer,this_plan%counts,this_plan%displs,mpi_double_precision, & |
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this_plan%comm, mpi_err) |
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|
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if (mpi_err /= 0) then |
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if (present(status)) status = -1 |
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endif |
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|
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end subroutine gather_double |
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|
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subroutine gather_double_2d( sbuffer, rbuffer, this_plan, status) |
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|
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type (gs_plan), intent(in) :: this_plan |
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real( kind = DP ), dimension(:,:), intent(in) :: sbuffer |
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real( kind = DP ), dimension(:,:), intent(in) :: rbuffer |
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integer :: noffset,i,ierror |
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integer, intent(out), optional :: status |
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|
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external mpi_allgatherv |
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|
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if (present(status)) status = 0 |
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|
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! noffset = this_plan%displs(this_plan%me) |
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|
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call mpi_allgatherv(sbuffer,this_plan%n_datum, mpi_double_precision, & |
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rbuffer,this_plan%counts,this_plan%displs,mpi_double_precision, & |
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this_plan%comm, mpi_err) |
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|
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if (mpi_err /= 0) then |
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if (present(status)) status = -1 |
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endif |
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|
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end subroutine gather_double_2d |
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|
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subroutine scatter_double( sbuffer, rbuffer, this_plan, status) |
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|
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type (gs_plan), intent(in) :: this_plan |
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real( kind = DP ), dimension(:), intent(in) :: sbuffer |
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real( kind = DP ), dimension(:), intent(in) :: rbuffer |
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integer, intent(out), optional :: status |
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external mpi_reduce_scatter |
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|
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if (present(status)) status = 0 |
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|
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call mpi_reduce_scatter(sbuffer,rbuffer, this_plan%counts, & |
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mpi_double_precision, MPI_SUM, this_plan%comm, mpi_err) |
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|
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if (mpi_err /= 0) then |
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if (present(status)) status = -1 |
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endif |
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|
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end subroutine scatter_double |
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|
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subroutine scatter_double_2d( sbuffer, rbuffer, this_plan, status) |
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|
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type (gs_plan), intent(in) :: this_plan |
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real( kind = DP ), dimension(:,:), intent(in) :: sbuffer |
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real( kind = DP ), dimension(:,:), intent(in) :: rbuffer |
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integer, intent(out), optional :: status |
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external mpi_reduce_scatter |
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|
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if (present(status)) status = 0 |
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call mpi_reduce_scatter(sbuffer,rbuffer, this_plan%counts, & |
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mpi_double_precision, MPI_SUM, this_plan%comm, mpi_err) |
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|
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if (mpi_err /= 0) then |
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if (present(status)) status = -1 |
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endif |
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|
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end subroutine scatter_double_2d |
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|
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|
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#endif |
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end module mpiSimulation |
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