SharedMemoryParallelDispatch.h

// -*- tab-width: 2; indent-tabs-mode: nil; coding: utf-8-with-signature -*-
//-----------------------------------------------------------------------------
// Copyright 2000-2026 CEA (www.cea.fr) IFPEN (www.ifpenergiesnouvelles.com)
// See the top-level COPYRIGHT file for details.
// SPDX-License-Identifier: Apache-2.0
//-----------------------------------------------------------------------------
/*---------------------------------------------------------------------------*/
/* SharedMemoryParallelDispatch.h                              (C) 2000-2026 */
/*                                                                           */
/* Implementation of messages in shared memory.                              */
/*---------------------------------------------------------------------------*/
#ifndef ARCANE_PARALLEL_THREAD_SHAREDMEMORYPARALLELDISPATCH_H
#define ARCANE_PARALLEL_THREAD_SHAREDMEMORYPARALLELDISPATCH_H
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
#include "arcane/utils/TraceAccessor.h"
#include "arcane/utils/Array.h"
#include "arcane/utils/IThreadBarrier.h"
#include "arcane/utils/HPReal.h"
#include "arcane/utils/DataTypeContainer.h"
#include "arcane/utils/MemoryView.h"
 
#include "arcane/core/IParallelDispatch.h"
#include "arcane/core/ISerializer.h"
 
#include "arccore/base/ReferenceCounterImpl.h"
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
namespace Arcane::MessagePassing
{
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
class SharedMemoryParallelMng;
class ISharedMemoryMessageQueue;
class SharedMemoryParallelDispatchBase;
template <class Type>
class SharedMemoryParallelDispatch;
 
namespace impl
{
  template <typename DataType>
  class ShareMemoryDispatcherContainer
  {
   public:
 
    void resize(Int64 n)
    {
      all_dispatchs.resize(n);
      all_dispatchs_base.resize(n);
    }
 
   public:
 
    UniqueArray<SharedMemoryParallelDispatch<DataType>*> all_dispatchs;
    UniqueArray<SharedMemoryParallelDispatchBase*> all_dispatchs_base;
  };
} // namespace impl
 
/*---------------------------------------------------------------------------*/
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template <typename DataType>
class ThreadDispatcherContainerTraits
{
 public:
 
  using InstanceType = impl::ShareMemoryDispatcherContainer<DataType>;
};
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
class SharedMemoryAllDispatcher
: public ArcaneDataTypeContainer<ThreadDispatcherContainerTraits>
{
 public:

  class CreateSubParallelMngInfo
  {
   public:
 
    Ref<IParallelMngContainer> m_builder;
  };
 
 public:
 
  void resize(Integer n)
  {
    m_char.resize(n);
    m_signed_char.resize(n);
    m_unsigned_char.resize(n);
    m_short.resize(n);
    m_unsigned_short.resize(n);
    m_int.resize(n);
    m_unsigned_int.resize(n);
    m_long.resize(n);
    m_unsigned_long.resize(n);
    m_long_long.resize(n);
    m_unsigned_long_long.resize(n);
    m_float.resize(n);
    m_double.resize(n);
    m_long_double.resize(n);
    m_apreal.resize(n);
    m_real2.resize(n);
    m_real3.resize(n);
    m_real2x2.resize(n);
    m_real3x3.resize(n);
    m_hpreal.resize(n);
  }
 
 public:
 
  CreateSubParallelMngInfo m_create_sub_parallel_mng_info;
};
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/

class SharedMemoryParallelDispatchBase
: public TraceAccessor
, public ReferenceCounterImpl
{
  ARCCORE_INTERNAL_DEFINE_REFERENCE_COUNTED_INCLASS_METHODS();
 
 protected:
 
  template <typename DataType> friend class SharedMemoryParallelDispatch;
  using Request = Parallel::Request;
  using PointToPointMessageInfo = Parallel::PointToPointMessageInfo;
  using MessageRank = Parallel::MessageRank;
  using MessageTag = Parallel::MessageTag;
 
 protected:
 
  class IResizableArray
  {
   public:
 
    virtual ~IResizableArray() = default;
 
   public:
 
    virtual void resize(Int64 new_size) = 0;
    virtual MutableMemoryView memoryView() const = 0;
  };
 
  class AllToAllVariableInfo
  {
   public:
 
    ConstMemoryView send_buf;
    Span<const Int32> send_count;
    Span<const Int32> send_index;
    MutableMemoryView recv_buf;
    Span<const Int32> recv_count;
    Span<const Int32> recv_index;
  };
 
 protected:
 
  SharedMemoryParallelDispatchBase(ITraceMng* tm, SharedMemoryParallelMng* parallel_mng,
                                   ISharedMemoryMessageQueue* message_queue,
                                   ArrayView<SharedMemoryParallelDispatchBase*> all_dispatchs_base);
 
 protected:
 
  void _genericAllToAll(ConstMemoryView send_buf, MutableMemoryView recv_buf, Int32 count);
  void _genericAllGather(ConstMemoryView send_buf, MutableMemoryView recv_buf);
  void _genericAllGatherVariable(ConstMemoryView send_buf, IResizableArray* recv_buf);
  void _genericAllToAllVariable(ConstMemoryView send_buf,
                                Span<const Int32> send_count, Span<const Int32> send_index,
                                MutableMemoryView recv_buf,
                                Span<const Int32> recv_count, Span<const Int32> recv_index);
  void _genericScatterVariable(ConstMemoryView send_buf, MutableMemoryView recv_buf, Int32 root);
  Request _genericSend(ConstMemoryView send_buffer, const PointToPointMessageInfo& message2);
  Request _genericReceive(MutableMemoryView recv_buffer, const PointToPointMessageInfo& message2);
  void _genericBroadcast(MutableMemoryView send_buf, Int32 rank);
 
 protected:
 
  // Accessible par 'SharedMemoryParallelDispatch'
  ConstMemoryView m_const_view;
  MutableMemoryView m_recv_view;
  ConstMemoryView m_send_view;
 
 private:
 
  MutableMemoryView m_broadcast_view;
 
 protected:
 
  SharedMemoryParallelMng* m_parallel_mng = nullptr;
  Int32 m_rank = -1;
  Int32 m_nb_rank = 0;
  ISharedMemoryMessageQueue* m_message_queue = nullptr;
 
 protected:
 
  void _collectiveBarrier();
 
 private:
 
  AllToAllVariableInfo m_alltoallv_infos;
  ArrayView<SharedMemoryParallelDispatchBase*> m_all_dispatchs_base;
};
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/

template <class Type>
class SharedMemoryParallelDispatch
: public SharedMemoryParallelDispatchBase
, public IParallelDispatchT<Type>
, public ITypeDispatcher<Type>
{
  using BaseClass = SharedMemoryParallelDispatchBase;
 
  class ResizableArrayRef : public IResizableArray
  {
   public:
 
    explicit ResizableArrayRef(Array<Type>& v)
    : m_array_ref(v)
    {}
 
   public:
 
    void resize(Int64 new_size) override { m_array_ref.resize(new_size); }
    MutableMemoryView memoryView() const override { return MutableMemoryView(m_array_ref.span()); }
 
   private:
 
    Array<Type>& m_array_ref;
  };
 
  class ReduceInfo
  {
   public:
 
    Span<const Type> reduce_buf;
    Type reduce_value;
    int m_index;
  };
 
 private:
 
  class MinMaxSumInfo
  {
   public:
 
    Int32 m_min_rank;
    Int32 m_max_rank;
    Type m_min_value;
    Type m_max_value;
    Type m_sum_value;
  };
 
 public:
 
  using Request = Parallel::Request;
  using PointToPointMessageInfo = Parallel::PointToPointMessageInfo;
  using MessageRank = Parallel::MessageRank;
  using MessageTag = Parallel::MessageTag;
  typedef Parallel::eReduceType eReduceType;
 
 public:
 
  SharedMemoryParallelDispatch(ITraceMng* tm, SharedMemoryParallelMng* parallel_mng,
                               ISharedMemoryMessageQueue* message_queue,
                               impl::ShareMemoryDispatcherContainer<Type>& containers);
  ~SharedMemoryParallelDispatch() override;
  void finalize() override;
 
 public:

  void broadcast(Span<Type> send_buf, Int32 sub_domain) override;
  void allGather(Span<const Type> send_buf, Span<Type> recv_buf) override;
  void allGatherVariable(Span<const Type> send_buf, Array<Type>& recv_buf) override;
  void gather(Span<const Type> send_buf, Span<Type> recv_buf, Int32 rank) override;
  void gatherVariable(Span<const Type> send_buf, Array<Type>& recv_buf, Int32 rank) override;
  void scatterVariable(Span<const Type> send_buf, Span<Type> recv_buf, Int32 root) override;
  void allReduce(eReduceType op, Span<Type> send_and_receive_buf) override;
  void allReduce(eReduceType op, Span<const Type> send_buf, Span<Type> receive_buf) override;
  void allToAll(Span<const Type> send_buf, Span<Type> recv_buf, Int32 count) override;
  void allToAllVariable(Span<const Type> send_buf, ConstArrayView<Int32> send_count,
                        ConstArrayView<Int32> send_index, Span<Type> recv_buf,
                        ConstArrayView<Int32> recv_count, ConstArrayView<Int32> recv_index) override;
  Request send(Span<const Type> send_buffer, Int32 proc, bool is_blocked) override;
  Request send(Span<const Type> send_buffer, const PointToPointMessageInfo& message) override;
  Request receive(Span<Type> recv_buffer, Int32 rank, bool is_blocked) override;
  Request receive(Span<Type> recv_buffer, const PointToPointMessageInfo& message) override;
  Request nonBlockingAllReduce(eReduceType op, Span<const Type> send_buf, Span<Type> recv_buf) override;
  Request nonBlockingAllGather(Span<const Type> send_buf, Span<Type> recv_buf) override;
  Request nonBlockingBroadcast(Span<Type> send_buf, Int32 rank) override;
  Request nonBlockingGather(Span<const Type> send_buf, Span<Type> recv_buf, Int32 rank) override;
  Request nonBlockingAllToAll(Span<const Type> send_buf, Span<Type> recv_buf, Int32 count) override;
  Request nonBlockingAllToAllVariable(Span<const Type> send_buf, ConstArrayView<Int32> send_count,
                                      ConstArrayView<Int32> send_index, Span<Type> recv_buf,
                                      ConstArrayView<Int32> recv_count, ConstArrayView<Int32> recv_index) override;
  Request gather(Arccore::MessagePassing::GatherMessageInfo<Type>&) override;
 
  void broadcast(ArrayView<Type> send_buf, Integer sub_domain) override
  {
    this->broadcast(Span<Type>(send_buf), sub_domain);
  }
  void allGather(ConstArrayView<Type> send_buf, ArrayView<Type> recv_buf) override
  {
    this->allGather(Span<const Type>(send_buf), Span<Type>(recv_buf));
  }
  void allGatherVariable(ConstArrayView<Type> send_buf, Array<Type>& recv_buf) override
  {
    this->allGatherVariable(Span<const Type>(send_buf), recv_buf);
  }
  void gather(ConstArrayView<Type> send_buf, ArrayView<Type> recv_buf, Integer rank) override
  {
    this->gather(Span<const Type>(send_buf), Span<Type>(recv_buf), rank);
  }
  void gatherVariable(ConstArrayView<Type> send_buf, Array<Type>& recv_buf, Integer rank) override
  {
    this->gatherVariable(Span<const Type>(send_buf), recv_buf, rank);
  }
  void scatterVariable(ConstArrayView<Type> send_buf, ArrayView<Type> recv_buf, Integer root) override
  {
    this->scatterVariable(Span<const Type>(send_buf), Span<Type>(recv_buf), root);
  }
  void allToAll(ConstArrayView<Type> send_buf, ArrayView<Type> recv_buf, Integer count) override
  {
    this->allToAll(Span<const Type>(send_buf), Span<Type>(recv_buf), count);
  }
  void allToAllVariable(ConstArrayView<Type> send_buf, Int32ConstArrayView send_count,
                        Int32ConstArrayView send_index, ArrayView<Type> recv_buf,
                        Int32ConstArrayView recv_count, Int32ConstArrayView recv_index) override
  {
    this->allToAllVariable(Span<const Type>(send_buf), send_count, send_index,
                           Span<Type>(recv_buf), recv_count, recv_index);
  }
  Request send(ConstArrayView<Type> send_buffer, Integer proc, bool is_blocked) override
  {
    return this->send(Span<const Type>(send_buffer), proc, is_blocked);
  }
  Request recv(ArrayView<Type> recv_buffer, Int32 rank, bool is_blocked) override
  {
    return this->receive(Span<Type>(recv_buffer), rank, is_blocked);
  }
  void allReduce(eReduceType op, ArrayView<Type> send_buf) override
  {
    return this->allReduce(op, Span<Type>(send_buf));
  }
  void allReduce(eReduceType op, ConstArrayView<Type> send_buf, ArrayView<Type> receive_buf) override
  {
    return this->allReduce(op, Span<const Type>(send_buf), Span<Type>(receive_buf));
  }
 
  void send(ConstArrayView<Type> send_buffer, Integer proc) override;
  void recv(ArrayView<Type> recv_buffer, Integer proc) override;
  void sendRecv(ConstArrayView<Type> send_buffer, ArrayView<Type> recv_buffer, Integer proc) override;
  Type allReduce(eReduceType op, Type send_buf) override;
  Type scan(eReduceType op, Type send_buf) override;
  void scan(eReduceType op, ArrayView<Type> send_buf) override;
  void computeMinMaxSum(Type val, Type& min_val, Type& max_val, Type& sum_val,
                        Int32& min_rank,
                        Int32& max_rank) override;
  void computeMinMaxSum(ConstArrayView<Type> values,
                        ArrayView<Type> min_values,
                        ArrayView<Type> max_values,
                        ArrayView<Type> sum_values,
                        ArrayView<Int32> min_ranks,
                        ArrayView<Int32> max_ranks) override;
  ITypeDispatcher<Type>* toArccoreDispatcher() override { return this; }
 
  void waitAll();
 
 public:
 
  ArrayView<SharedMemoryParallelDispatch<Type>*> m_all_dispatchs;
 
 public:
 
  ReduceInfo m_reduce_infos;
 
 private:
 
  void _allReduceOrScan(eReduceType op, Span<const Type> send_buf, Span<Type> receive_buf, bool is_scan);
};
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
} // End namespace Arcane::MessagePassing
 
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/*---------------------------------------------------------------------------*/
 
#endif