Have you ever wanted to know what functions your Ruby program is calling?
rbspy can tell you!
rbspy lets you profile Ruby processes that are already running. You give it a PID, and it starts
profiling! It's a sampling profiler, which means it's low overhead and safe to run in
If you're on macOS, install rbspy with Homebrew:
brew install rbspy
If you have a working Rust toolchain (1.56 or newer), you can install with cargo:
cargo install rbspy
Otherwise, check out the installing section to get rbspy running on your computer.
If your program is already running, get its PID and profile it like this:
rbspy record --pid $PID
You can also use rbspy to profile a Ruby script, like this. It works both with and without bundle exec.
rbspy record -- bundle exec ruby my-script.rb
Here's what running
rbspy record on a Rubocop process looks like. You'll see a live summary of
what the top functions being run are, and it also saves the raw data + a flamegraph for more in