A key value proposition of native Reason is building fast, native apps.
However, apps and tools can often start out fast when they are simple - but decay as more features and complexity are added.
reperf is inspired by the core_bench tools from Janestreet. Unfortunately, at least at time of writing, the core_bench OPAM package does not work on Windows. (Or rather - its dependencies, like spawn do not work on Windows).
reperf helps with the following:
- Timing - how much time am I spending in a code block?
- Call count - how often is this code-path being called?
- Allocations - how is a code-block impacting the garbage collector?
In addition, reperf supports benchmarks, which are test cases that exercise performance scenarios. reperf can output a JSON performance report, and compare it with previous iterations - and fail if a regression is detected. This helps you keep your app fast!