Benchmarks for 3 KV data engines: LevelDB, Badger, Bolt.

Random Write, 1000 entries

• LevelDB: 4.85s
• Badger: 4.80s
• Bolt: 5.32s

Space utilization, 1000 entries

• LevelDB: 380kb
• Badger: 488kb
• Bolt: 572kb

Random Read, 1M entries

• LevelDB: 13.81s
• Badger: 9.08s
• Bolt: 3.45s

Batch Write, 128k entries

• LevelDB: 771ms
• Badger: 615ms
• Bolt: 4.54s

Notes

• All benchmarks use 32 byte random keys with 300 byte random values. Results were on an Intel i5 7200U with 8GB RAM
• For random write benchmarks, each write operation was configured to write to the hard drive. Worth noting that Bolt was the only database out of the 3 where writes were safe by default.
• For batch write benchmarks, leveldb and badger provide an API that can efficiently batch using a single goroutine. Bolt's batch API requires each batch operation to be executed in a separate goroutine, and for each batch operation to be idempotent. Some tweaking was required to find the right balance between goroutines spawned and operations per batch.