Simon Willison’s Weblog

6 items tagged “juliaevans”


entr: rerun your build when files change. “WHY DID NOBODY TELL ME ABOUT THIS BEFORE?!?!” is one of my favourite genres of blog post. # 1st July 2020, 3:58 pm


SQL queries don’t start with SELECT. This is really useful. Understanding that SELECT (and associated window functions) happen after the WHERE, GROUP BY and HAVING helps explain why you can’t filter a query based on the results of a window function for example. # 3rd October 2019, 8:56 pm


Build impossible programs. Delightful talk by Julia Evans describing how she went about building a Ruby profiler in Rust despite having no knowledge of Ruby internals and only beginner’s knowledge of Rust. # 19th September 2018, 6:38 pm

Using flamegraphs. I really like flamegraphs as a profiling tool—we have support for them baked into our Tikibar debugging toolbar at Eventbrite—but interpreting them isn’t particularly intuitive on first glance. Julia Evans has put together a great explanation of how to read them as part of the documentation for her rbspy Ruby profiler. # 21st March 2018, 8:56 pm


How do Ruby & Python profilers work? Julia Evans: “As a precursor to writing a Ruby profiler I wanted to do a survey of how existing Ruby & Python profilers work.” # 18th December 2017, 12:12 pm

How to teach technical concepts with cartoons. Julia Evans: “This post is about a few patterns I use when illustrating ideas about computers. If you are interested in using drawings to teach people about your very favorite computer topics, hopefully this will help you!” # 28th October 2017, 2:55 pm