Goruco Videos

Eileen Uchitelle

How to performance


Understanding performance output can feel like reading tea leaves. It makes sense to a few people, but many of us are left in the dark; overwhelmed and frustrated by the data. On top of that there are a ton of performance tools to choose from; StackProf, RubyProf, AllocationTracer. Where do you even start?

While working on speeding up integration tests in Rails source, I learned that the key to improving the performance of Ruby code is having a baseline, not relying on one profiler and understanding the advantages and limitations of your tools. By utilizing these methods, integration tests are now 3 times faster than they were in Rails 4.2.0, with more improvements being made every day.

In this talk we will not only look at how to read performance output, but when and how to use the right profilers for the job. We’ll discuss a variety of methods and techniques for benchmarking and profiling so you can get the most out of any performance tool.


Eileen M. Uchitelle spends her days working on performance and security at Basecamp; or as you probably know it better, the place Ruby on Rails was born. She accidentally started contributing to open source after giving a talk on some problems with Active Record. Aaron Patterson was there and told her "fix it yourself" (not really). When she's not making Rails better by improving Active Record and speeding up integration tests, Eileen enjoys craft beer and hiking in the Hudson Valley with her husband and their dog.