P# is a framework for rapid development of reliable asynchronous software. The P# project, which started as a collaboration between Microsoft Research and Imperial College London, is used by several teams in Azure to design, implement and automatically test production distributed systems and services.
The P# framework provides:
- An actor-based programming model for building event-driven asynchronous applications. The unit of concurrency in P# is an asynchronous communicating state-machine, which is basically an actor that can create new machines, send and receive events, and transition to different states. Using P# machines, you can express your design and code at a higher level that is a natural fit for many cloud services.
- An efficient, lightweight runtime that is build on top of the Task Parallel Library (TPL). This runtime can be used to deploy a P# program in production. The P# runtime is very flexible and can work with any communication and storage layer.
- The capability to easily write safety and liveness specifications (similar to TLA+) programmatically in C#.
- A systematic testing engine that can control the P# program schedule, as well as all declared sources of nondeterminism (e.g. failures and timeouts), and systematically explore the actual executable code to discover bugs (e.g. crashes or specification violations). If a bug is found, the P# testing engine will report a deterministic reproducible trace that can be replayed using the Visual Studio Debugger.
Read the P# programming guide and then read about various features and topics here.
How to build
How to contribute
We welcome contributions! However, before you start contributing, please read carefully the development guidelines.