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!
! Copyright (C) 2013 Quantum ESPRESSO group
! This file is distributed under the terms of the
! GNU General Public License. See the file `License'
! in the root directory of the present distribution,
! or http://www.gnu.org/copyleft/gpl.txt .
!
!----------------------------------------------------------------------------
MODULE mp_pools
!----------------------------------------------------------------------------
!
USE mp, ONLY : mp_barrier, mp_size, mp_rank, mp_comm_split
USE parallel_include
!
IMPLICIT NONE
SAVE
!
! ... Pool groups (processors within a pool of k-points)
! ... Subdivision of image group, used for k-point parallelization
!
INTEGER :: npool = 1 ! number of "k-points"-pools
INTEGER :: nproc_pool = 1 ! number of processors within a pool
INTEGER :: me_pool = 0 ! index of the processor within a pool
INTEGER :: root_pool = 0 ! index of the root processor within a pool
INTEGER :: my_pool_id = 0 ! index of my pool
INTEGER :: inter_pool_comm = 0 ! inter pool communicator
INTEGER :: intra_pool_comm = 0 ! intra pool communicator
!
INTEGER :: kunit = 1 ! granularity of k-point distribution
! kunit=1 standard case. In phonon k and k+q must
! be on the same pool, so kunit=2.
!
CONTAINS
!
!----------------------------------------------------------------------------
SUBROUTINE mp_start_pools( npool_, parent_comm )
!---------------------------------------------------------------------------
!
! ... Divide processors (of the "parent_comm" group) into "pools"
! ... Requires: npool_, read from command line
! ... parent_comm, typically world_comm = group of all processors
!
IMPLICIT NONE
!
INTEGER, INTENT(IN) :: npool_, parent_comm
!
INTEGER :: parent_nproc = 1, parent_mype = 0
!
#if defined (__MPI)
!
parent_nproc = mp_size( parent_comm )
parent_mype = mp_rank( parent_comm )
!
! ... npool_ must have been previously read from command line argument
! ... by a call to routine get_command_line
!
npool = npool_
IF ( npool < 1 .OR. npool > parent_nproc ) CALL errore( 'mp_start_pools',&
'invalid number of pools, out of range', 1 )
IF ( MOD( parent_nproc, npool ) /= 0 ) CALL errore( 'mp_start_pools', &
'invalid number of pools, parent_nproc /= nproc_pool * npool', 1 )
!
! ... number of cpus per pool of k-points (created inside each parent group)
!
nproc_pool = parent_nproc / npool
!
!
! ... my_pool_id = pool index for this processor ( 0 : npool - 1 )
! ... me_pool = processor index within the pool ( 0 : nproc_pool - 1 )
!
my_pool_id = parent_mype / nproc_pool
me_pool = MOD( parent_mype, nproc_pool )
!
CALL mp_barrier( parent_comm )
!
! ... the intra_pool_comm communicator is created
!
CALL mp_comm_split ( parent_comm, my_pool_id, parent_mype, intra_pool_comm )
!
CALL mp_barrier( parent_comm )
!
! ... the inter_pool_comm communicator is created
!
CALL mp_comm_split ( parent_comm, me_pool, parent_mype, inter_pool_comm )
!
#endif
!
RETURN
END SUBROUTINE mp_start_pools
!
END MODULE mp_pools
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