Revision fa5a15ceb5d2b9ec7fc8ed1580a01cd72b896ac9 authored by Adam Retter on 15 May 2017, 17:45:14 UTC, committed by Facebook Github Bot on 15 May 2017, 18:12:08 UTC
Summary: Closes https://github.com/facebook/rocksdb/issues/2280 Closes https://github.com/facebook/rocksdb/pull/2292 Differential Revision: D5061259 Pulled By: sagar0 fbshipit-source-id: eec89111d114c04beee5870a4eb4b51857754783
1 parent 3fa9a39
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.
// This source code is also licensed under the GPLv2 license found in the
// COPYING file in the root directory of this source tree.
#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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