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db: add options to configure block index database

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There was a previous assumption that blockindex would be quite small. With addressindex
and spentindex enabled the blockindex is much larger and the amount of cache allocated for
it should also increase. Furthermore, enabling compression should decrease the amount of
disk space required and less data to write/read. The default leveldb max_open_files is set to
1000, for the blockindex the default is set to 1000 with compression. The 64 value that is
current is kept for the utxo database and does not enable compression. Two additional options
are added here to be able to configure the values for leveldb and the block index:

- `-dbmaxopenfiles` A number of files for leveldb to keep open
- `-dbcompression` Boolean 0 or 1 to enable snappy leveldb compression
This commit is contained in:
Braydon Fuller
2016-07-13 18:38:04 -04:00
parent e0d02ff20f
commit de05c9ecbb
6 changed files with 37 additions and 18 deletions
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10
src/dbwrapper.cpp
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@@ -29,14 +29,14 @@ void HandleError(const leveldb::Status& status) throw(dbwrapper_error)
throw dbwrapper_error("Unknown database error");
}
static leveldb::Options GetOptions(size_t nCacheSize)
static leveldb::Options GetOptions(size_t nCacheSize, bool compression, int maxOpenFiles)
{
leveldb::Options options;
options.block_cache = leveldb::NewLRUCache(nCacheSize / 2);
options.write_buffer_size = nCacheSize / 4; // up to two write buffers may be held in memory simultaneously
options.filter_policy = leveldb::NewBloomFilterPolicy(10);
options.compression = leveldb::kNoCompression;
options.max_open_files = 64;
options.compression = compression ? leveldb::kSnappyCompression : leveldb::kNoCompression;
options.max_open_files = maxOpenFiles;
if (leveldb::kMajorVersion > 1 || (leveldb::kMajorVersion == 1 && leveldb::kMinorVersion >= 16)) {
// LevelDB versions before 1.16 consider short writes to be corruption. Only trigger error
// on corruption in later versions.
@@ -45,14 +45,14 @@ static leveldb::Options GetOptions(size_t nCacheSize)
return options;
}
CDBWrapper::CDBWrapper(const boost::filesystem::path& path, size_t nCacheSize, bool fMemory, bool fWipe, bool obfuscate)
CDBWrapper::CDBWrapper(const boost::filesystem::path& path, size_t nCacheSize, bool fMemory, bool fWipe, bool obfuscate, bool compression, int maxOpenFiles)
{
penv = NULL;
readoptions.verify_checksums = true;
iteroptions.verify_checksums = true;
iteroptions.fill_cache = false;
syncoptions.sync = true;
options = GetOptions(nCacheSize);
options = GetOptions(nCacheSize, compression, maxOpenFiles);
options.create_if_missing = true;
if (fMemory) {
penv = leveldb::NewMemEnv(leveldb::Env::Default());