You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
98 lines
3.0 KiB
98 lines
3.0 KiB
// Copyright (c) 2018 PaddlePaddle Authors. All Rights Reserved.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
#pragma once
|
|
|
|
#if defined(PADDLE_WITH_CUDA) && !defined(_WIN32)
|
|
#include <memory>
|
|
#include <string>
|
|
#include <unordered_map>
|
|
#include <vector>
|
|
|
|
#include "boost/variant.hpp"
|
|
#include "paddle/fluid/framework/data_type.h"
|
|
#include "paddle/fluid/platform/device_context.h"
|
|
#include "paddle/fluid/platform/enforce.h"
|
|
|
|
namespace paddle {
|
|
namespace platform {
|
|
|
|
// In order to apply hierarchical communication with NCCL, we need
|
|
// a communication ring contains NCCL communicators associated to a global
|
|
// ncclUniqueId. E.g. for a hierarchical case,
|
|
//
|
|
// 11 - 12 21 - 22
|
|
// | | | |
|
|
// 13 - 14 - 23 - 24
|
|
// | |
|
|
// 31 - 32 - 41 - 42
|
|
// | | | |
|
|
// 33 - 34 43 - 44
|
|
//
|
|
// we group (14,23,32,41) as the top, and (11,12,13,14), (21,22,23,24),
|
|
// (31,32,33,34), (41,42,43,44) as bottoms respectively.
|
|
//
|
|
// We could also use a single communication ring for the flatten case
|
|
//
|
|
// The NCCLComm instance is created and reversed in the NCCLCommContext
|
|
// singleton with a global user specified group id.
|
|
class NCCLComm {
|
|
public:
|
|
virtual int ring_id() const = 0;
|
|
virtual int nranks() const = 0;
|
|
virtual int rank() const = 0;
|
|
virtual int device_id() const = 0;
|
|
virtual ncclComm_t comm() const = 0;
|
|
virtual cudaStream_t stream() const = 0;
|
|
virtual ~NCCLComm() = default;
|
|
};
|
|
|
|
// a singleton NCCL communicator context reserves communication ring ids
|
|
// Assume multiprocessing mode
|
|
class NCCLCommContext {
|
|
public:
|
|
static NCCLCommContext& Instance() {
|
|
static NCCLCommContext comm_ctx;
|
|
return comm_ctx;
|
|
}
|
|
~NCCLCommContext();
|
|
|
|
NCCLComm* CreateNCCLComm(ncclUniqueId* nccl_id, int nranks, int rank,
|
|
int dev_id, int ring_id = 0);
|
|
|
|
// retrieve a communicator by the ring id
|
|
NCCLComm* Get(int ring_id) const {
|
|
PADDLE_ENFORCE(comm_map_.count(ring_id),
|
|
"comunicator in ring id %d has not been initialized",
|
|
ring_id);
|
|
return comm_map_.at(ring_id).get();
|
|
}
|
|
|
|
private:
|
|
// ring id to NCCLComm
|
|
std::unordered_map<int, std::unique_ptr<NCCLComm>> comm_map_;
|
|
|
|
// device id to CUDADeviceContext
|
|
std::unordered_map<int, std::unique_ptr<CUDADeviceContext>> dev_ctx_map_;
|
|
|
|
NCCLCommContext() = default;
|
|
NCCLCommContext(const NCCLCommContext& other) = delete;
|
|
NCCLCommContext& operator=(const NCCLCommContext& other) = delete;
|
|
};
|
|
|
|
} // namespace platform
|
|
} // namespace paddle
|
|
|
|
#endif
|