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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-21 11:54:28 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-21 11:54:28 +0000 |
commit | e6918187568dbd01842d8d1d2c808ce16a894239 (patch) | |
tree | 64f88b554b444a49f656b6c656111a145cbbaa28 /src/rocksdb/memory/memory_usage.h | |
parent | Initial commit. (diff) | |
download | ceph-upstream/18.2.2.tar.xz ceph-upstream/18.2.2.zip |
Adding upstream version 18.2.2.upstream/18.2.2
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/rocksdb/memory/memory_usage.h')
-rw-r--r-- | src/rocksdb/memory/memory_usage.h | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/src/rocksdb/memory/memory_usage.h b/src/rocksdb/memory/memory_usage.h new file mode 100644 index 000000000..76b9bd130 --- /dev/null +++ b/src/rocksdb/memory/memory_usage.h @@ -0,0 +1,38 @@ +// Copyright (c) 2011-present, Facebook, Inc. All rights reserved. +// This source code is licensed under both the GPLv2 (found in the +// COPYING file in the root directory) and Apache 2.0 License +// (found in the LICENSE.Apache file in the root directory). + +#pragma once + +#include <cstddef> +#include <unordered_map> +#ifdef USE_FOLLY +#include <folly/container/F14Map.h> +#endif + +#include "rocksdb/rocksdb_namespace.h" + +namespace ROCKSDB_NAMESPACE { + +// 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) { + using Map = std::unordered_map<Key, Value, Hash>; + 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*); +} + +#ifdef USE_FOLLY +template <class Key, class Value, class Hash> +size_t ApproximateMemoryUsage(const folly::F14FastMap<Key, Value, Hash>& umap) { + return sizeof(umap) + umap.getAllocatedMemorySize(); +} +#endif + +} // namespace ROCKSDB_NAMESPACE |