options

const (
	DefaultMaxFileSize           = 2 * 1024 * 1024
	DefaultBlockSize             = 4096
	DefaultBlockRestartInterval  = 16
	DefaultBlockCompressionRatio = 8.0 / 7.0
	DefaultWriteBufferSize       = 4 * 1024 * 1024
	DefaultCompression           = compress.SnappyCompression
	DefaultMaxOpenFiles          = 1000
	DefaultBlockCacheCapacity    = 8 * 1024 * 1024
	DefaultCompactionConcurrency = 1

	// DefaultCompactionBytesPerSeek gives a default value for
	// CompactionBytesPerSeek option based on following assumptions:
	//   (1) One seek costs 10ms
	//   (2) Writing or reading 1MB costs 10ms (100MB/s)
	//   (3) A compaction of 1MB does 25MB of IO:
	//         1MB read from this level
	//         10-12MB read from next level (boundaries may be misaligned)
	//         10-12MB written to next level
	// This implies that 25 seeks cost the same as the compaction
	// of 1MB of data.  I.e., one seek costs approximately the
	// same as the compaction of 40KB of data. We are a little
	// conservative and allow approximately one seek for every 16KB
	// of data before triggering a compaction.    -- LevelDB (C++)
	DefaultCompactionBytesPerSeek = 16 * 1024

	DefaultMinimalAllowedOverlapSeeks  = 100
	DefaultIterationBytesPerSampleSeek = 1024 * 1024

	DefaultLevel0ThrottleStepFiles  = 4
	DefaultLevel0CompactionFiles    = 4
	DefaultLevel0SlowdownWriteFiles = DefaultLevel0CompactionFiles + DefaultLevel0ThrottleStepFiles
	DefaultLevel0StopWriteFiles     = DefaultLevel0SlowdownWriteFiles + DefaultLevel0ThrottleStepFiles
)