It’s up at github – installation is dead easy (assuming you’re on Rails 2.3+, of course) – just install the plugin, restart your app, and hit <your url>/stats/scrap in your browser. Bam, instant juicy memory goodness about your app at your fingertips. If you’d like an example of the output, good news! Check it out at http://tachyonsix.com/scrap.htm.

You can use it to troubleshoot heap leaks – just run a few requests, hit your Scrap URL, and see what your deltas look like. Seeing a huge growth in a certain type of object? Chances are pretty good that you have a heap leak, and can start tracking it down.

The request history can help you locate certain actions that might be causing spikes in memory usage. It’ll show the last N requests, along with memory and heap statistics before each request. If there’s a consistent memory usage leap after a certain action, chances are that it’s doing something naughty.

Want to get a bigger picture on what objects are hanging around? You can use the config/scrap.yml file to get Scrap to spit out more detailed reports on instances of a given class. There’s full documentation on it in the README.

Anyhow, give it a shot, let me know what you think.