I've built a web-app and i want to start tracking request latencies so that i can see how the app handles more and more people using it. However, i'm not sure how this can be done. I'd like to be able to log the start-time when the request comes in and then log the end time as the response gets sent out. Do i need to bookend each action with a before-filter and after-filter? Also, how could i track these numbers independent of caching? From my understanding, if i use rails caching, it will not go into the code if the page exists in the cache. I know that if i use caches_action, then the filters will be run, however, its important that i can log the times as close to the use as possible. I think this means either just before it hits dispatch.fcgi or just after. For certain actions i'd also like to log request information (referer urls, IP address, etc). Does this mean i always have to go into the code and not serve files straight from disk? If anyone has implemented a good system for tracking real-time latencies, i'd greatly appreciate hearing about it. Thanks in advance.
on 2006-05-18 06:26