1/* Copyright 2018 The TensorFlow Authors. All Rights Reserved.
2
3Licensed under the Apache License, Version 2.0 (the "License");
4you may not use this file except in compliance with the License.
5You may obtain a copy of the License at
6
7 http://www.apache.org/licenses/LICENSE-2.0
8
9Unless required by applicable law or agreed to in writing, software
10distributed under the License is distributed on an "AS IS" BASIS,
11WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12See the License for the specific language governing permissions and
13limitations under the License.
14==============================================================================*/
15#ifndef TENSORFLOW_CORE_COMMON_RUNTIME_RING_REDUCER_H_
16#define TENSORFLOW_CORE_COMMON_RUNTIME_RING_REDUCER_H_
17
18#include <deque>
19#include <memory>
20#include <string>
21#include <vector>
22
23#include "tensorflow/core/common_runtime/base_collective_executor.h"
24#include "tensorflow/core/common_runtime/ring_alg.h"
25#include "tensorflow/core/framework/collective.h"
26
27namespace tensorflow {
28class Device;
29
30// Ring-algorithm implementation of collective all-reduce.
31class RingReducer : public RingAlg {
32 public:
33 RingReducer() : RingAlg(REDUCTION_COLLECTIVE, "Reduce") {}
34 ~RingReducer() override;
35
36 // Begins async execution of the ring reduce algorithm.
37 // Must be called in a blockable thread.
38 // TODO(b/80529858): remove the previous warning when we have a dedicated
39 // collective threadpool.
40 void Run(StatusCallback done) override;
41
42 Status InitializeCollectiveParams(CollectiveParams* col_params) override;
43
44 protected:
45 void InitRingField(RingField* rf, int chunk_idx, int subdiv_idx,
46 int field_idx) override;
47
48 private:
49 void ContinueAfterInputCopy();
50 bool RunAsyncParts();
51
52 Tensor group_size_tensor_;
53 Notification group_size_tensor_ready_;
54
55 friend class RingReducerTest;
56 friend class RingReducerInitParamsTest;
57};
58
59} // namespace tensorflow
60#endif // TENSORFLOW_CORE_COMMON_RUNTIME_RING_REDUCER_H_
61