Marko Anastasov wrote this on June 18, 2009
Rails log analytics using request-log-analyzer
request-log-analyzer is a great little gem that can quickly process your log file and tell you a thing or two about your application’s performance and bottlenecks.
bq. It uses several metrics, including cumulative request time, average request time, process blockers, database and rendering time, HTTP methods and statuses, Rails action cache statistics, etc.
Check out some sample output. Before you decide to invest in a commercial performance monitor, make sure you squeeze all you can from the plain old log files in your local terminal.