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| author | Pieter Wuille <pieter.wuille@gmail.com> | 2016-10-28 19:12:39 -0700 |
|---|---|---|
| committer | Pieter Wuille <pieter.wuille@gmail.com> | 2016-11-07 13:56:27 -0800 |
| commit | d59a518466f6b9012666a3f9392ec12fff8830b5 (patch) | |
| tree | d851ca45a75edab810626eed6708d11107a24dea | |
| parent | 25a211aa9edfeccc1e65bf699e0b32619cef2157 (diff) | |
Use fixed preallocation instead of costly GetSerializeSize
Dbwrapper used GetSerializeSize() to compute the size of the buffer
to preallocate. For some cases (specifically: CCoins) this requires
a costly compression call. Avoid this by just using fixed size
preallocations instead.
| -rw-r--r-- | src/dbwrapper.h | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/src/dbwrapper.h b/src/dbwrapper.h index 7728b49d93..4a79bbd17d 100644 --- a/src/dbwrapper.h +++ b/src/dbwrapper.h @@ -17,6 +17,9 @@ #include <leveldb/db.h> #include <leveldb/write_batch.h> +static const size_t DBWRAPPER_PREALLOC_KEY_SIZE = 64; +static const size_t DBWRAPPER_PREALLOC_VALUE_SIZE = 1024; + class dbwrapper_error : public std::runtime_error { public: @@ -60,12 +63,12 @@ public: void Write(const K& key, const V& value) { CDataStream ssKey(SER_DISK, CLIENT_VERSION); - ssKey.reserve(GetSerializeSize(ssKey, key)); + ssKey.reserve(DBWRAPPER_PREALLOC_KEY_SIZE); ssKey << key; leveldb::Slice slKey(&ssKey[0], ssKey.size()); CDataStream ssValue(SER_DISK, CLIENT_VERSION); - ssValue.reserve(GetSerializeSize(ssValue, value)); + ssValue.reserve(DBWRAPPER_PREALLOC_VALUE_SIZE); ssValue << value; ssValue.Xor(dbwrapper_private::GetObfuscateKey(parent)); leveldb::Slice slValue(&ssValue[0], ssValue.size()); @@ -77,7 +80,7 @@ public: void Erase(const K& key) { CDataStream ssKey(SER_DISK, CLIENT_VERSION); - ssKey.reserve(GetSerializeSize(ssKey, key)); + ssKey.reserve(DBWRAPPER_PREALLOC_KEY_SIZE); ssKey << key; leveldb::Slice slKey(&ssKey[0], ssKey.size()); @@ -107,7 +110,7 @@ public: template<typename K> void Seek(const K& key) { CDataStream ssKey(SER_DISK, CLIENT_VERSION); - ssKey.reserve(GetSerializeSize(ssKey, key)); + ssKey.reserve(DBWRAPPER_PREALLOC_KEY_SIZE); ssKey << key; leveldb::Slice slKey(&ssKey[0], ssKey.size()); piter->Seek(slKey); @@ -200,7 +203,7 @@ public: bool Read(const K& key, V& value) const { CDataStream ssKey(SER_DISK, CLIENT_VERSION); - ssKey.reserve(GetSerializeSize(ssKey, key)); + ssKey.reserve(DBWRAPPER_PREALLOC_KEY_SIZE); ssKey << key; leveldb::Slice slKey(&ssKey[0], ssKey.size()); @@ -234,7 +237,7 @@ public: bool Exists(const K& key) const { CDataStream ssKey(SER_DISK, CLIENT_VERSION); - ssKey.reserve(GetSerializeSize(ssKey, key)); + ssKey.reserve(DBWRAPPER_PREALLOC_KEY_SIZE); ssKey << key; leveldb::Slice slKey(&ssKey[0], ssKey.size()); |