NoSQL Benchmark.

NoSQL Benchmark (nb) is a multi-threaded benchmark tool for evaluating main
database performance metrics using OLTP-alike benchmarking against
a specified workload.

Features include:

* benchmarking types: unlimited, time limited or maximum thread limited
* different threads creation policies: at once or interleaved
* key distribution supported: uniform, gaussian
* key types supported: string, u32, u64
* CSV report file generation supported (for future plot generation)
* single configuration file
* workload tests are specified in percents against a total request count
* supported database drivers: tarantool, leveldb (redis, memcached planned).
* plotter tool (CSV to GNU Plot generation)