Revision 760ef68a69d1e727e80487a5f9d15ccad47bab00 authored by Andrew Kryczka on 16 November 2016, 21:52:00 UTC, committed by Facebook Github Bot on 16 November 2016, 22:09:07 UTC
Summary: pinned_iters_mgr_ pins iterators allocated with arena_, so we should order the instance variable declarations such that the pinned iterators have their destructors executed before the arena is destroyed. Closes https://github.com/facebook/rocksdb/pull/1528 Differential Revision: D4191984 Pulled By: ajkr fbshipit-source-id: 1386f20
1 parent 327085b
memory_usage.h
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
#pragma once
#include <unordered_map>
namespace rocksdb {
// Helper methods to estimate memroy usage by std containers.
template <class Key, class Value, class Hash>
size_t ApproximateMemoryUsage(
const std::unordered_map<Key, Value, Hash>& umap) {
typedef std::unordered_map<Key, Value, Hash> Map;
return sizeof(umap) +
// Size of all items plus a next pointer for each item.
(sizeof(typename Map::value_type) + sizeof(void*)) * umap.size() +
// Size of hash buckets.
umap.bucket_count() * sizeof(void*);
}
} // namespace rocksdb
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