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80 lines
2.4 KiB
80 lines
2.4 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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#include "paddle/fluid/memory/allocation/buffered_allocator.h"
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#include <algorithm>
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#include <limits>
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#include <utility>
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namespace paddle {
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namespace memory {
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namespace allocation {
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BufferedAllocator::BufferedAllocator(std::shared_ptr<Allocator> allocator)
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: underlying_allocator_(std::move(allocator)) {
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PADDLE_ENFORCE_NOT_NULL(
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underlying_allocator_,
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platform::errors::InvalidArgument(
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"Underlying allocator of BufferedAllocator is NULL"));
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if (underlying_allocator_->IsAllocThreadSafe()) {
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mtx_.reset(new std::mutex());
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}
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}
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BufferedAllocator::~BufferedAllocator() { FreeCache(-1UL); }
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void BufferedAllocator::FreeCache(size_t size) {
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platform::LockGuardPtr<std::mutex> guard(mtx_);
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if (UNLIKELY(size == 0)) return;
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size_t cur = 0;
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while (!allocations_.empty()) { // free the largest
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auto it = --allocations_.end();
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cur += it->second->size();
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underlying_allocator_->Free(it->second.release());
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allocations_.erase(it);
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if (cur >= size) return;
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}
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}
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bool BufferedAllocator::IsAllocThreadSafe() const { return mtx_ != nullptr; }
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void BufferedAllocator::FreeImpl(Allocation *allocation) {
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platform::LockGuardPtr<std::mutex> guard(mtx_);
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allocations_.emplace(allocation->size(), AllocationPtr(allocation));
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}
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Allocation *BufferedAllocator::AllocateImpl(size_t size) {
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{
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platform::LockGuardPtr<std::mutex> guard(mtx_);
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auto it = allocations_.lower_bound(size);
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if (it != allocations_.end() && it->first < size * 2) {
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AllocationPtr result(std::move(it->second));
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allocations_.erase(it);
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return result.release();
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}
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}
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try {
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return underlying_allocator_->Allocate(size).release();
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} catch (BadAlloc &) {
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FreeCache(size);
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return underlying_allocator_->Allocate(size).release();
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}
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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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