#The rack app how to#

Memory_profiler will let us use rack-mini-profilerвЂ™s GC features.ДЇire up a server in development mode and hit a page. This gem is Ruby 2.1+ only - donвЂ™t include it otherwise ( rack-mini-profiler will fallback to another gem, fast_stack). Stackprof is a stack profiler (imagine that), which will be important when we start building our flame graphs. Rack-mini-profiler is self explanatory, but what are the other gems doing here?ДЇlamegraph will give us the super-pretty flame graphs that weвЂ™re going to use later on. The installation procedure is slightly different for a pure Rack app, see the README for more.ДЇirst, letвЂ™s add the following gems to our Gemfile, below any database gems like вЂpgвЂ™ or вЂmysql2вЂ™. InstallationДЇor the purposes of this demo, IвЂ™m going to assume youвЂ™re in a Rails app.

#The rack app how to#

In this post, IвЂ™m going to take a deep dive on rack-mini-profiler and show you how to use each of its powerful features to maximize the performance of your Rails app. Not to mention RailsвЂ™ development mode settings, like reloading classes on every request! But your development environment is usually a lot different than production - hardware, virtualization environments, and system configuration can all be different and play a huge part in performance. Of course, it also works fine in development. Yeah! You can accurately profile production performance (say that three times fast) with rack-mini-profiler. The best part - rack-mini-profiler is designed to be run in production.

I wouldnвЂ™t hesitate to say that rack-mini-profiler is my favorite and most important tool for developing fast Ruby webapps. Rack-mini-profiler is a a performance tool for Rack applications, maintained by the talented rack-mini-profiler provides an entire suite of tools for measuring the performance of Rack-enabled web applications, including detailed drill downs on SQL queries, server response times (with a breakdown for each template and partial), incredibly detailed millisecond-by-millisecond breakdowns of execution times with the incredible flamegraph feature, and will even help you track down memory leaks with its excellent garbage collection features. Measure SQL queries, memory allocation and CPU time. Summary: rack-mini-profiler is a powerful Swiss army knife for Rack app performance.