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118 lines
3.8 KiB
118 lines
3.8 KiB
// Copyright (c) 2018 PaddlePaddle Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#pragma once
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#if defined(PADDLE_WITH_CUDA) && !defined(_WIN32)
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#include <map>
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#include <memory>
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#include <string>
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#include <vector>
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#include "boost/variant.hpp"
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#include "paddle/fluid/framework/data_type.h"
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#include "paddle/fluid/platform/device_context.h"
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#include "paddle/fluid/platform/enforce.h"
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namespace paddle {
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namespace platform {
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// In order to apply hierarchical communication with NCCL, we need
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// a communication ring contains NCCL communicators associated to a global
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// ncclUniqueId. E.g. for a hierarchical case,
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//
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// 11 - 12 21 - 22
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// | | | |
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// 13 - 14 - 23 - 24
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// | |
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// 31 - 32 - 41 - 42
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// | | | |
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// 33 - 34 43 - 44
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//
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// we group (14,23,32,41) as the top, and (11,12,13,14), (21,22,23,24),
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// (31,32,33,34), (41,42,43,44) as bottoms respectively.
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//
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// We could also use a single communication ring for the flatten case
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//
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// The NCCLComm instance is created and reversed in the NCCLCommContext
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// singleton with a global user specified group id.
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class NCCLComm {
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public:
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virtual int ring_id() const = 0;
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virtual int nranks() const = 0;
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virtual int rank() const = 0;
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virtual int device_id() const = 0;
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virtual ncclComm_t comm() const = 0;
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virtual cudaStream_t stream() const = 0;
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virtual ~NCCLComm() = default;
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};
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// A singleton NCCL communicator context reserves communication ring ids
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class NCCLCommContext {
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public:
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static NCCLCommContext& Instance() {
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static NCCLCommContext comm_ctx;
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return comm_ctx;
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}
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NCCLComm* CreateNCCLComm(ncclUniqueId* nccl_id, int nranks, int rank,
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int dev_id, int ring_id = 0);
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void CreateAllNCCLComms(const std::vector<int>& dev_ids, int ring_id = 0);
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// retrieve a communicator by the ring id in multiprocessing mode
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NCCLComm* Get(int ring_id) const {
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PADDLE_ENFORCE_GT(comm_map_.count(ring_id), 0,
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"comunicator in ring id %d has not been initialized",
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ring_id);
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PADDLE_ENFORCE_EQ(comm_map_.at(ring_id).size(), 1,
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"you should specify a device id to retrieve from "
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"multiple communicators");
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return comm_map_.at(ring_id).begin()->second.get();
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}
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// retrieve a communicator by the ring id and the device id
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NCCLComm* Get(int ring_id, int dev_id) const {
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PADDLE_ENFORCE_GT(comm_map_.count(ring_id), 0,
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"comunicator of ring id %d has not been initialized",
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ring_id);
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PADDLE_ENFORCE_GT(
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comm_map_.at(ring_id).count(dev_id), 0,
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"comunicator at device id %d has not been initialized in ring %d",
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dev_id, ring_id);
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return comm_map_.at(ring_id).at(dev_id).get();
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}
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// retrieve a communicator by the ring id and place
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NCCLComm* Get(int ring_id, Place place) const {
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return Get(ring_id, boost::get<CUDAPlace>(place).device);
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}
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private:
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std::once_flag once_flag_;
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std::mutex comm_map_mutex_;
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// ring id to dev-NCCLComm
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std::map<int, std::map<int, std::unique_ptr<NCCLComm>>> comm_map_;
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void ReleaseNCCLComms();
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NCCLCommContext() = default;
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DISABLE_COPY_AND_ASSIGN(NCCLCommContext);
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};
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} // namespace platform
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} // namespace paddle
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#endif
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