Memorylogic - Memory usage logger

This library help to track down memory leak. It worked very well because it adds the process id and memory usage in with EVERY single line logged and at the end of each rails request. This way, if you have a cluster, you can monitor each process and scroll through your logs and watch the memory. If it suddenly starts to jump you can look at the request and at least you have a starting point. You can checkout the code for that specific controller action and try to narrow it down.