env_mem

https://github.com/noahgibbs/env_mem

EnvMem allows you to dump your GC.stat information from a long-running server, then produce a simple shellscript to set up your Ruby memory environment variables to match that configuration. This improves startup time slightly and allows you finer-grain control over your memory setup. If you've ever found Ruby memory environment variables on a web page and used them to try to speed up your app, this is a better approach.