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72 lines
2.3 KiB
72 lines
2.3 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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#include <functional>
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#include <utility>
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#include <vector>
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#include "paddle/fluid/memory/allocation/allocator.h"
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namespace paddle {
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namespace memory {
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namespace allocation {
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// A composite allocator who will dispatch the allocation request by registered
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// condition.
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//
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// For example:
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//
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// auto* cond_allocator = new ConditionalAllocator();
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// cond_allocator->AddAllocator([](size_t size, Attr attr){
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// // if size > 10
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// return size > 10;
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// }, allocator_a).AddAllocator([](size_t size, Attr attr){
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// // elif attr is kDefault
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// return attr == kDefault;
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// }, allocator_b).AddAllocator([](size_t size, Attr attr){
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// // else
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// return true;
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// }, allocator_c);
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class ConditionalAllocator : public ManagedAllocator {
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public:
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ConditionalAllocator() = default;
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ConditionalAllocator& AddAllocator(
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std::function<bool(size_t, Attr)> func,
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std::shared_ptr<ManagedAllocator> allocator);
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std::unique_ptr<Allocation> Allocate(size_t size, Attr attr) override;
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std::shared_ptr<Allocation> AllocateShared(size_t size, Attr attr) override;
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bool IsAllocThreadSafe() const override;
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private:
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template <typename Callback>
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inline typename std::result_of<Callback(ManagedAllocator&)>::type
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SelectAndInvoke(size_t size, Attr attr, Callback callback) {
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for (auto& pair : underlying_allocators_) {
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if (pair.first(size, attr)) {
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return callback(*pair.second);
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}
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}
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PADDLE_THROW("No suitable allocator");
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}
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std::vector<std::pair<std::function<bool(size_t, Attr)>,
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std::shared_ptr<ManagedAllocator>>>
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underlying_allocators_;
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};
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} // namespace allocation
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} // namespace memory
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} // namespace paddle
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