Dynamic Image Caching

I have a CherryPy app that dynamically generates images, and those images are re-used a lot but generated each time. The image is generated from a querystring开发者_开发问答 containing the variables, so the same query string will always return the same image (until I rewrite the generation code) and the images are not user-specific.

It occurred to me that I should be aggressively caching those images, but I have no idea how I would go about doing that. Should I be memoizing in CherryPy? Should I do something like this for Apache? Another layer entirely?

Your first attempt should be to use the HTTP cache that comes with CherryPy. See http://docs.cherrypy.org/dev/refman/lib/caching.html for an overview. From there, it's usually a "simple" matter of balancing computational expense versus RAM consumption via cache timeouts.