tpchgen-rs

August 26, 2025 · View on GitHub

Apache licensed Build Status

Blazing fast TPCH benchmark data generator, in pure Rust with zero dependencies.

Features

  1. Blazing Speed 🚀
  2. Obsessively Tested 📋
  3. Fully parallel, streaming, constant memory usage 🧠

Try it now

The easiest way to use this software is via the tpchgen-cli tool.

Performance

tpchgen-cli is more than 10x faster than the next fastest TPCH generator we know of. On a 2023 Mac M3 Max laptop, it easily generates data faster than can be written to SSD. See BENCHMARKS.md for more details on performance and benchmarking.

Times to create TPCH tables in Parquet format using tpchgen-cli and duckdb for various scale factors.

Scale Factortpchgen-cliDuckDBDuckDB (proprietary)
10:02.240:12.290:10.68
100:09.971:46.801:41.14
1001:14.2217:48.2716:40.88
100010:26.26N/A (OOM)N/A (OOM)
  • DuckDB (proprietary) is the time required to create TPCH data using the proprietary DuckDB format
  • Creating Scale Factor 1000 using DuckDB required 647 GB of memory, which is why it is not included in the table above.

Parquet Generation Performance

Answers

The core tpchgen crate provides answers for queries 1 to 22 and for a scale factor of 1. The answers exposed were derived from the TPC-H Tools official distribution.

Testing

This crate has extensive tests to ensure correctness and produces exactly the same, byte-for-byte output as the original dbgen implementation. We compare the output of this crate with dbgen as part of every checkin. See TESTING.md for more details on testing methodology

Crates

  • tpchgen: the core data generator logic for TPC-H. It has no dependencies and is easy to embed in other Rust project.

  • tpchgen-arrow generates TPC-H data in Apache Arrow format. It depends on the arrow-rs library

  • tpchgen-cli is a dbgen compatible CLI tool that generates benchmark dataset using multiple processes.

Contributing

Pull requests are welcome. For major changes, please open an issue first for discussion. See our contributors guide for more details.

Architecture

Please see architecture guide for details on how the code is structured.

License

The project is licensed under the APACHE 2.0 license.

References

  • The TPC-H Specification, see the specification page.
  • The Original dbgen Implementation you must submit an official request to access the software dbgen at their official website