Limbo

Limbo is a work-in-progress, in-process OLTP database management system, compatible with SQLite.

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Features

• In-process OLTP database engine library
• Asynchronous I/O support with io_uring
• SQLite compatibility
  • SQL dialect support (wip)
  • File format support (read-only)
  • SQLite C API (wip)
• JavaScript/WebAssembly bindings (wip)

Getting Started

Limbo is currently read-only. You can either use the sqlite3 program to create a database:

$ sqlite3 database.db
SQLite version 3.42.0 2023-05-16 12:36:15
Enter ".help" for usage hints.
sqlite> CREATE TABLE users (id INT PRIMARY KEY, username TEXT);
sqlite> INSERT INTO users VALUES (1, 'alice');
sqlite> INSERT INTO users VALUES (2, 'bob');

or use the testing script to generate one for you:

./testing/gen-database.py

You can then start the Limbo shell with:

$ cargo run database.db
Welcome to Limbo SQL shell!
> SELECT * FROM users LIMIT 1;
|1|Cody|Miller|mhurst@example.org|525.595.7319x21268|33667 Shaw Extension Suite 104|West Robert|VA|45161|`

Developing

Run tests:

cargo test

Test coverage report:

cargo tarpaulin -o html

Run benchmarks:

cargo bench

Run benchmarks and generate flamegraphs:

echo -1 | sudo tee /proc/sys/kernel/perf_event_paranoid
cargo bench --bench benchmark -- --profile-time=5

Publications

• Pekka Enberg, Sasu Tarkoma, Jon Crowcroft Ashwin Rao (2024). Serverless Runtime / Database Co-Design With Asynchronous I/O. In EdgeSys ‘24. [PDF]
• Pekka Enberg, Sasu Tarkoma, and Ashwin Rao (2023). Towards Database and Serverless Runtime Co-Design. In CoNEXT-SW ’23. [PDF] [Slides]

License

This project is licensed under the MIT license.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in Limbo by you, shall be licensed as MIT, without any additional terms or conditions.