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lammps/lib/kokkos/core/src/Qthread/Kokkos_Qthread_Parallel.hpp
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Kokkos_Qthread_Parallel.hpp
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/*
//@HEADER
// ************************************************************************
//
// Kokkos: Manycore Performance-Portable Multidimensional Arrays
// Copyright (2012) Sandia Corporation
//
// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
// the U.S. Government retains certain rights in this software.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// 3. Neither the name of the Corporation nor the names of the
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SANDIA CORPORATION OR THE
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Questions? Contact H. Carter Edwards (hcedwar@sandia.gov)
//
// ************************************************************************
//@HEADER
*/
#ifndef KOKKOS_QTHREAD_PARALLEL_HPP
#define KOKKOS_QTHREAD_PARALLEL_HPP
#include <vector>
#include <Kokkos_Parallel.hpp>
#include <impl/Kokkos_StaticAssert.hpp>
#include <Qthread/Kokkos_QthreadExec.hpp>
//----------------------------------------------------------------------------
namespace Kokkos {
namespace Impl {
//----------------------------------------------------------------------------
template< class FunctorType , typename IntType , unsigned P >
class ParallelFor< FunctorType
, Kokkos::RangePolicy< Kokkos::Qthread , void , IntType , P >
, Kokkos::Qthread
>
{
public:
typedef Kokkos::RangePolicy< Kokkos::Qthread , void , IntType , P > Policy ;
const FunctorType m_func ;
const Policy m_policy ;
// Function is called once by every concurrent thread.
static void execute( QthreadExec & exec , const void * arg )
{
const ParallelFor & self = * ((const ParallelFor *) arg );
const Policy range( self.m_policy , exec.worker_rank() , exec.worker_size() );
const typename Policy::member_type work_end = range.end();
for ( typename Policy::member_type iwork = range.begin() ; iwork < work_end ; ++iwork ) {
self.m_func( iwork );
}
// All threads wait for completion.
exec.exec_all_barrier();
}
ParallelFor( const FunctorType & functor
, const Policy & policy
)
: m_func( functor )
, m_policy( policy )
{
Impl::QthreadExec::exec_all( Qthread::instance() , & ParallelFor::execute , this );
}
};
//----------------------------------------------------------------------------
template< class FunctorType , typename IntType , unsigned P >
class ParallelReduce< FunctorType
, Kokkos::RangePolicy< Kokkos::Qthread , void , IntType , P >
, Kokkos::Qthread
>
{
public:
typedef ReduceAdapter< FunctorType > Reduce ;
typedef typename Reduce::pointer_type pointer_type ;
typedef Kokkos::RangePolicy< Kokkos::Qthread , void , IntType , P > Policy ;
const FunctorType m_func ;
const Policy m_policy ;
static void execute( QthreadExec & exec , const void * arg )
{
const ParallelReduce & self = * ((const ParallelReduce *) arg );
const Policy range( self.m_policy , exec.worker_rank() , exec.worker_size() );
// Initialize thread-local value
typename Reduce::reference_type update = Reduce::init( self.m_func , exec.exec_all_reduce_value() );
const typename Policy::member_type work_end = range.end();
for ( typename Policy::member_type iwork = range.begin() ; iwork < work_end ; ++iwork ) {
self.m_func( iwork , update );
}
exec.exec_all_reduce( self.m_func );
}
template< class HostViewType >
ParallelReduce( const FunctorType & functor
, const Policy & policy
, const HostViewType & result_view )
: m_func( functor )
, m_policy( policy )
{
QthreadExec::resize_worker_scratch( Reduce::value_size( m_func ) , 0 );
Impl::QthreadExec::exec_all( Qthread::instance() , & ParallelReduce::execute , this );
const pointer_type data = (pointer_type) QthreadExec::exec_all_reduce_result();
Reduce::final( m_func , data );
if ( result_view.ptr_on_device() ) {
const unsigned n = Reduce::value_count( m_func );
for ( unsigned i = 0 ; i < n ; ++i ) { result_view.ptr_on_device()[i] = data[i]; }
}
}
};
//----------------------------------------------------------------------------
template< class FunctorType >
class ParallelReduce< FunctorType , TeamPolicy< Kokkos::Qthread > , Kokkos::Qthread >
{
public:
typedef ReduceAdapter< FunctorType > Reduce ;
typedef typename Reduce::pointer_type pointer_type ;
typedef TeamPolicy< Kokkos::Qthread > policy_team ;
const FunctorType m_func ;
const policy_team m_team ;
static void execute( QthreadExec & exec , const void * arg )
{
const ParallelReduce & self = * ((const ParallelReduce *) arg );
// Initialize thread-local value
typename Reduce::reference_type update = Reduce::init( self.m_func , exec.exec_all_reduce_value() );
typename policy_team::member_type team_index( exec , self.m_team );
while ( team_index ) {
// Reset shared memory offset to beginning of reduction range.
exec.shared_reset();
self.m_func( team_index , update );
team_index.team_barrier();
team_index.next_team();
}
exec.exec_all_reduce( self.m_func );
}
template< class ViewType >
ParallelReduce( const FunctorType & functor ,
const policy_team & policy ,
const ViewType & result )
: m_func( functor )
, m_team( policy )
{
QthreadExec::resize_worker_scratch
( /* reduction memory */ Reduce::value_size( functor )
, /* team shared memory */ FunctorTeamShmemSize< FunctorType >::value( functor ) , policy.team_size() );
Impl::QthreadExec::exec_all( Qthread::instance() , & ParallelReduce::execute , this );
const pointer_type data = (pointer_type) QthreadExec::exec_all_reduce_result();
Reduce::final( m_func , data );
const unsigned n = Reduce::value_count( m_func );
for ( unsigned i = 0 ; i < n ; ++i ) { result.ptr_on_device()[i] = data[i]; }
}
inline void wait() {}
inline ~ParallelReduce() { wait(); }
};
//----------------------------------------------------------------------------
//----------------------------------------------------------------------------
template< class FunctorType , typename IntType , unsigned P >
class ParallelScan< FunctorType
, Kokkos::RangePolicy< Kokkos::Qthread , void , IntType , P >
, Kokkos::Qthread
>
{
public:
typedef ReduceAdapter< FunctorType > Reduce ;
typedef typename Reduce::pointer_type pointer_type ;
typedef Kokkos::RangePolicy< Kokkos::Qthread , void , IntType , P > Policy ;
const FunctorType m_func ;
const Policy m_policy ;
static void execute( QthreadExec & exec , const void * arg )
{
const ParallelScan & self = * ((const ParallelScan *) arg );
const Policy range( self.m_policy , exec.worker_rank() , exec.worker_size() );
// Initialize thread-local value
typename Reduce::reference_type update = Reduce::init( self.m_func , exec.exec_all_reduce_value() );
const typename Policy::member_type work_end = range.end();
for ( typename Policy::member_type iwork = range.begin() ; iwork < work_end ; ++iwork ) {
self.m_func( iwork , update , false );
}
exec.exec_all_scan( self.m_func );
for ( typename Policy::member_type iwork = range.begin() ; iwork < work_end ; ++iwork ) {
self.m_func( iwork , update , true );
}
exec.exec_all_barrier();
}
ParallelScan( const FunctorType & functor
, const Policy & policy
)
: m_func( functor )
, m_policy( policy )
{
QthreadExec::resize_worker_scratch( Reduce::value_size( m_func ) , 0 );
Impl::QthreadExec::exec_all( Qthread::instance() , & ParallelScan::execute , this );
}
};
} // namespace Impl
} // namespace Kokkos
//----------------------------------------------------------------------------
//----------------------------------------------------------------------------
#endif /* #define KOKKOS_QTHREAD_PARALLEL_HPP */
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