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!! MPI support for long range forces using force decomposition |
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!! on a square grid of processors. |
| 3 |
!! Corresponds to mpiSimunation.cpp for C++ |
| 4 |
!! 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_module.F90,v 1.2 2003-01-09 19:40:38 chuckv Exp $, $Date: 2003-01-09 19:40:38 $, $Name: not supported by cvs2svn $, $Revision: 1.2 $ |
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module mpiSimulation |
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#ifdef MPI |
| 15 |
use mpi |
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implicit none |
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PRIVATE |
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|
| 19 |
|
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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 :: replanSimParallel |
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public :: getNcol |
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public :: getNrow |
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|
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|
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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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|
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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 => NULL() |
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integer :: gsPlanSize !! size of this plan (nDim*nComponents) |
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integer :: globalPlanSize !! size of all components in plan |
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integer, dimension(:), pointer :: displs !! Displacements array for mpi indexed from 0. |
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integer, dimension(:), pointer :: counts !! Counts array for mpi indexed from 0. |
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integer :: myPlanComm !! My communicator for this plan |
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integer :: myPlanRank !! My rank in this plan |
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integer :: planNprocs !! Number of processors in 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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|
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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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|
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|
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contains |
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|
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!! Sets up mpiComponentPlan with structure passed from C++. |
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subroutine setupSimParallel(thisComponentPlan,status) |
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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, intent(out) :: status |
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integer, intnet(out) :: localStatus |
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|
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status = 0 |
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if (componentPlanSet) then |
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return |
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endif |
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|
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componentPlanSet = .true. |
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|
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call make_Force_Grid(thisComponentPlan,localStatus) |
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if (localStatus /= 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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call updateGridComponents(thisComponentPlan,localStatus) |
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if (localStatus /= 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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!! initialize gather and scatter plans used in this simulation |
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call plan_gather_scatter(1,thisComponentPlan%nComponentsRow,& |
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thisComponentPlan,row_comm,plan_row) |
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call plan_gather_scatter(nDim,thisComponentPlan%nComponentsRow,& |
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thisComponentPlan,row_comm,plan_row3d) |
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call plan_gather_scatter(1,thisComponentPlan%nComponentsColumn,& |
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thisComponentPlan,col_comm,plan_col) |
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call plan_gather_scatter(nDim,thisComponentPlan%nComponentsColumn,& |
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thisComponentPlan,col_comm,plan_col3d) |
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|
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|
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|
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end subroutine setupSimParallel |
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|
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subroutine replanSimParallel(thisComponentPlan,status) |
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! Passed Arguments |
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!! mpiComponentPlan struct from C |
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type (mpiComponentPlan), intent(inout) :: thisComponentPlan |
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integer, intent(out) :: status |
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integer, intnet(out) :: localStatus |
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|
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status = 0 |
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|
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call updateGridComponents(thisComponentPlan,localStatus) |
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if (localStatus /= 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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!! Unplan Gather Scatter plans |
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call unplan_gather_scatter(plan_row) |
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call unplan_gather_scatter(plan_row3d) |
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call unplan_gather_scatter(plan_col) |
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call unplan_gather_scatter(plan_col3d) |
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|
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|
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!! initialize gather and scatter plans used in this simulation |
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call plan_gather_scatter(1,thisComponentPlan%nComponentsRow,& |
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thisComponentPlan,row_comm,plan_row) |
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call plan_gather_scatter(nDim,thisComponentPlan%nComponentsRow,& |
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thisComponentPlan,row_comm,plan_row3d) |
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call plan_gather_scatter(1,thisComponentPlan%nComponentsColumn,& |
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thisComponentPlan,col_comm,plan_col) |
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call plan_gather_scatter(nDim,thisComponentPlan%nComponentsColumn,& |
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thisComponentPlan,col_comm,plan_col3d) |
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|
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|
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|
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end subroutine replanSimParallel |
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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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|
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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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|
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status = 0 |
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if (.not. componentPlanSet) return |
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|
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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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|
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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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|
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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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|
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thisComponentPlan%nComponentsRow = nComponentsRow |
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thisComponentPlan%nComponentsColumn = nComponentsColumn |
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|
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|
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end subroutine updateGridComponents |
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|
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|
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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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|
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|
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if (.not. ComponentPlanSet) return |
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status = 0 |
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|
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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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|
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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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|
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|
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|
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nColumnsMax = nint(sqrt(real(nWorldProcessors,kind=dp))) |
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|
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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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|
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nRows = nWorldProcessors/nColumns |
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|
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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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|
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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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|
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|
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end subroutine make_Force_Grid |
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|
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|
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!! initalizes a gather scatter plan |
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subroutine plan_gather_scatter( nDim,nComponents,thisComponentPlan, & |
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thisComm, this_plan,status) |
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integer, intent(in) :: nDim !! Number of dimensions for gather scatter plan |
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integer, intent(in) :: nComponents |
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type (mpiComponentPlan), intent(in), target :: thisComponentPlan |
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type (gs_plan), intent(out) :: this_plan !! MPI Component Plan |
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integer, intent(in) :: thisComm !! MPI communicator for this plan |
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|
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integer :: arraySize !! size to allocate plan for |
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integer, intent(out), optional :: status |
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integer :: ierror |
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integer :: i,junk |
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|
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if (present(status)) status = 0 |
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|
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|
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!! Set gsComponetPlan pointer |
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!! to the componet plan we want to use for this gather scatter plan. |
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!! WARNING this could be dangerous since thisComponentPlan was origionally |
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!! allocated in C++ and there is a significant difference between c and |
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!! f95 pointers.... |
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gsComponentPlan => thisComponetPlan |
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|
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! Set this plan size for displs array. |
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this_plan%gsPlanSize = nDim * nComponents |
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|
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! Duplicate communicator for this plan |
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call mpi_comm_dup(thisComm,this_plan%myPlanComm,mpi_err) |
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if (mpi_err /= 0) then |
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if (present(status)) status = -1 |
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return |
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end if |
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call mpi_comm_rank(this_plan%myPlanComm,this_plan%myPlanRank,mpi_err) |
| 339 |
if (mpi_err /= 0) then |
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if (present(status)) status = -1 |
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return |
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end if |
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|
| 344 |
call mpi_comm_size(this_plan%myPlanComm,this_plan%planNprocs,mpi_err) |
| 345 |
|
| 346 |
if (mpi_err /= 0) then |
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if (present(status)) status = -1 |
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return |
| 349 |
end if |
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|
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!! counts and displacements arrays are indexed from 0 to be compatable |
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!! with MPI arrays. |
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allocate (this_plan%counts(0:this_plan%planNprocs-1),STAT=ierror) |
| 354 |
if (ierror /= 0) then |
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if (present(status)) status = -1 |
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return |
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end if |
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|
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allocate (this_plan%displs(0:this_plan%planNprocs-1),STAT=ierror) |
| 360 |
if (ierror /= 0) then |
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if (present(status)) status = -1 |
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return |
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end if |
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|
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!! gather all the local sizes into a size # processors array. |
| 366 |
call mpi_allgather(gs_plan%gsPlanSize,1,mpi_integer,this_plan%counts, & |
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1,mpi_integer,comm,mpi_err) |
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|
| 369 |
if (mpi_err /= 0) then |
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if (present(status)) status = -1 |
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return |
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end if |
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|
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|
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!! figure out the total number of particles in this plan |
| 376 |
this_plan%globalPlanSize = sum(this_plan%counts) |
| 377 |
|
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|
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!! initialize plan displacements. |
| 380 |
this_plan%displs(0) = 0 |
| 381 |
do i = 1, this_plan%planNprocs - 1,1 |
| 382 |
this_plan%displs(i) = this_plan%displs(i-1) + this_plan%counts(i-1) |
| 383 |
end do |
| 384 |
|
| 385 |
end subroutine plan_gather_scatter |
| 386 |
|
| 387 |
|
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subroutine unplan_gather_scatter(this_plan) |
| 389 |
type (gs_plan), intent(inout) :: this_plan |
| 390 |
|
| 391 |
|
| 392 |
this_plan%gsComponentPlan => null() |
| 393 |
call mpi_comm_free(this_plan%comm,mpi_err) |
| 394 |
|
| 395 |
deallocate(this_plan%counts) |
| 396 |
deallocate(this_plan%displs) |
| 397 |
|
| 398 |
end subroutine unplan_gather_scatter |
| 399 |
|
| 400 |
subroutine gather_integer( sbuffer, rbuffer, this_plan, status) |
| 401 |
|
| 402 |
type (gs_plan), intent(in) :: this_plan |
| 403 |
integer, dimension(:), intent(in) :: sbuffer |
| 404 |
integer, dimension(:), intent(in) :: rbuffer |
| 405 |
integer :: noffset |
| 406 |
integer, intent(out), optional :: status |
| 407 |
|
| 408 |
if (present(status)) status = 0 |
| 409 |
noffset = this_plan%displs(this_plan%myPlanRank) |
| 410 |
|
| 411 |
call mpi_allgatherv(sbuffer,this_plan%gsPlanSize, mpi_integer, & |
| 412 |
rbuffer,this_plan%counts,this_plan%displs,mpi_integer, & |
| 413 |
this_plan%myPlanComm, mpi_err) |
| 414 |
|
| 415 |
if (mpi_err /= 0) then |
| 416 |
if (present(status)) status = -1 |
| 417 |
endif |
| 418 |
|
| 419 |
end subroutine gather_integer |
| 420 |
|
| 421 |
subroutine gather_double( sbuffer, rbuffer, this_plan, status) |
| 422 |
|
| 423 |
type (gs_plan), intent(in) :: this_plan |
| 424 |
real( kind = DP ), dimension(:), intent(in) :: sbuffer |
| 425 |
real( kind = DP ), dimension(:), intent(in) :: rbuffer |
| 426 |
integer :: noffset |
| 427 |
integer, intent(out), optional :: status |
| 428 |
|
| 429 |
if (present(status)) status = 0 |
| 430 |
noffset = this_plan%displs(this_plan%me) |
| 431 |
|
| 432 |
call mpi_allgatherv(sbuffer,this_plan%gsPlanSize, mpi_double_precision, & |
| 433 |
rbuffer,this_plan%counts,this_plan%displs,mpi_double_precision, & |
| 434 |
this_plan%myPlanComm, mpi_err) |
| 435 |
|
| 436 |
if (mpi_err /= 0) then |
| 437 |
if (present(status)) status = -1 |
| 438 |
endif |
| 439 |
|
| 440 |
end subroutine gather_double |
| 441 |
|
| 442 |
subroutine gather_double_2d( sbuffer, rbuffer, this_plan, status) |
| 443 |
|
| 444 |
type (gs_plan), intent(in) :: this_plan |
| 445 |
real( kind = DP ), dimension(:,:), intent(in) :: sbuffer |
| 446 |
real( kind = DP ), dimension(:,:), intent(in) :: rbuffer |
| 447 |
integer :: noffset,i,ierror |
| 448 |
integer, intent(out), optional :: status |
| 449 |
|
| 450 |
external mpi_allgatherv |
| 451 |
|
| 452 |
if (present(status)) status = 0 |
| 453 |
|
| 454 |
! noffset = this_plan%displs(this_plan%me) |
| 455 |
|
| 456 |
call mpi_allgatherv(sbuffer,this_plan%gsPlanSize, mpi_double_precision, & |
| 457 |
rbuffer,this_plan%counts,this_plan%displs,mpi_double_precision, & |
| 458 |
this_plan%myPlanComm, mpi_err) |
| 459 |
|
| 460 |
if (mpi_err /= 0) then |
| 461 |
if (present(status)) status = -1 |
| 462 |
endif |
| 463 |
|
| 464 |
end subroutine gather_double_2d |
| 465 |
|
| 466 |
subroutine scatter_double( sbuffer, rbuffer, this_plan, status) |
| 467 |
|
| 468 |
type (gs_plan), intent(in) :: this_plan |
| 469 |
real( kind = DP ), dimension(:), intent(in) :: sbuffer |
| 470 |
real( kind = DP ), dimension(:), intent(in) :: rbuffer |
| 471 |
integer, intent(out), optional :: status |
| 472 |
external mpi_reduce_scatter |
| 473 |
|
| 474 |
if (present(status)) status = 0 |
| 475 |
|
| 476 |
call mpi_reduce_scatter(sbuffer,rbuffer, this_plan%counts, & |
| 477 |
mpi_double_precision, MPI_SUM, this_plan%myPlanComm, mpi_err) |
| 478 |
|
| 479 |
if (mpi_err /= 0) then |
| 480 |
if (present(status)) status = -1 |
| 481 |
endif |
| 482 |
|
| 483 |
end subroutine scatter_double |
| 484 |
|
| 485 |
subroutine scatter_double_2d( sbuffer, rbuffer, this_plan, status) |
| 486 |
|
| 487 |
type (gs_plan), intent(in) :: this_plan |
| 488 |
real( kind = DP ), dimension(:,:), intent(in) :: sbuffer |
| 489 |
real( kind = DP ), dimension(:,:), intent(in) :: rbuffer |
| 490 |
integer, intent(out), optional :: status |
| 491 |
external mpi_reduce_scatter |
| 492 |
|
| 493 |
if (present(status)) status = 0 |
| 494 |
call mpi_reduce_scatter(sbuffer,rbuffer, this_plan%counts, & |
| 495 |
mpi_double_precision, MPI_SUM, this_plan%myPlanComm, mpi_err) |
| 496 |
|
| 497 |
if (mpi_err /= 0) then |
| 498 |
if (present(status)) status = -1 |
| 499 |
endif |
| 500 |
|
| 501 |
end subroutine scatter_double_2d |
| 502 |
|
| 503 |
|
| 504 |
function getNcol(thisplan) result(ncol) |
| 505 |
type (gsPlan) :: thisplan |
| 506 |
integer :: ncol |
| 507 |
ncol = thisplan%gsComponentPlan%nComponentsCol |
| 508 |
end function getNcol |
| 509 |
|
| 510 |
function getNrow(thisplan) result(ncol) |
| 511 |
type (gsPlan) :: thisplan |
| 512 |
integer :: ncol |
| 513 |
ncol = thisplan%gsComponentPlan%nComponentsrow |
| 514 |
end function getNrow |
| 515 |
|
| 516 |
|
| 517 |
|
| 518 |
|
| 519 |
#endif |
| 520 |
end module mpiSimulation |
| 521 |
|
