Why does my App's Memory Use Grow Over Time?
Subscribe to my Newsletter 😻 🤠 Join thousands of developers who get new code, writing, and programming links from me delivered to their inboxes. Keep Reading 🚀 A Daft proc-macro trick: How to Emit Partial-Code + Errors Update (2025/04/02): The change I suggested below was merged in PR #64. It’s pretty neat I went from knowing nothing about this project to contributing to it in the span of a sin
Say No to Randos (in Your Database)
When I used my first ORM, I wondered “why didn’t they include a random() method?” It seemed like such an easy thing to add. While there are many reasons you may want to pull a record out of your database at random, you shouldn’t be using SQL’s ORDER BY RANDOM() unless you’ll only be randomizing a limited number of records. In this post, we’ll examine how such a simple looking SQL operator can caus
WTF is a Source Map
These days web assets such as JS and CSS aren’t simple text files. Instead, they’re typically minified or come from a complex build process involving compiling or transpiling. For example, CSS can be generated from a SASS file. JS can be compiled from ES6 using Babel. These toolchains make working with assets easier for developers, and make following best practices such as minification much easier
Gaijin Guide to RubyKaigi
Subscribe to my Newsletter 😻 🤠 Join thousands of developers who get new code, writing, and programming links from me delivered to their inboxes. Keep Reading 🚀 Bad Type Patterns - The Duplicate duck Why aren’t people writing more types? Perhaps it’s because the intermediate and expert developers deleted the patterns that didn’t work and left no trace for beginners to learn from. This post detai
How August 2017 RubyGems Vulnerabilities were patched on Heroku
This is less a blog post and more of an FYI. This is pretty much verbatim of a snippit I wrote to respond to people asking about the Rubygems vulnerabilities. The TLDR; push to Heroku using any supported Ruby version and you’re safe. If you’re not using a supported Ruby version upgrade your app. The vulnerabilites were fairly low impact, but you should still take steps to protect yourself. Recentl
How I lost 17,000 GitHub Auth Tokens in One Night
How on earth does someone accidentally delete 85% of their users’ GitHub tokens? I was suspicious that something might be wrong when I got an email from a service I run called CodeTriage, it’s a free web app to help find open source projects and issues to work on. While I get plenty of emails from my service, I don’t often get ones with the subject line “Code Triage auth failure”. Before we can un
Is WEBrick Webscale?
WEBrick is the “slowest” webserver in Ruby, how could it possibly be webscale? To answer this question and explore Is Ruby Too Slow For Web-Scale?, we will compare WEBrick to a real piece of “webscale” tech: NGINX. While there might be some faster webservers on the market, is there a case where WEBrick is fast enough? Before we can dig into that question, let’s look at a real world deployment of W
Online Master of Science in Computer Science (OMSCS)
Welcome to the Online Master of Science in Computer Science (OMSCS) OMSCS is for students who want a top-ranked degree, but also the flexibility to fit it in around their work and family lives. Students who want to push their own career forward, but without the high cost of an on-campus degree program. Students who want to be part of the Georgia Tech family. In OMSCS, all required courses and acti
OMG OMSCS: Is an Online Masters right for You?
Subscribe to my Newsletter 😻 🤠 Join thousands of developers who get new code, writing, and programming links from me delivered to their inboxes. Keep Reading 🚀 Bad Type Patterns - The Duplicate duck Why aren’t people writing more types? Perhaps it’s because the intermediate and expert developers deleted the patterns that didn’t work and left no trace for beginners to learn from. This post detai
How I Reduced my DB Server Load by 80%
❶ Author of How to Open Source (.dev). A book to take you from coder to contributor. ❷ Creator of CodeTriage, a free service helping developers contribute to open source. ❸ Core committer to ruby/ruby. ❹ Rust Cloud Native Buildpack author . ❺ Married to Ruby, literally. Database load can be a silent performance killer. I’ve been optimizing the query performance of a web app I run designed to get p
Using Heroku's Expensive Query Dashboard to Speed up your App | Heroku
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How to write a lock free Queue
Update: I did mention that lock free data structures are really hard to write, it looks like there might be some issues that haven’t been addressed in the implementation of this LF Queue that we’re referencing. The rest of the analysis is still valid and hopefully useful to you, just know there’s actually more that needs to be done, don’t try to use that code for a mission critical application out
Meditations on Writing a Queue
What is a queue besides the line for the little teacups at Disney? In programming, a queue is a very useful data structure that can simplify our programs, especially when it comes to threading. In today’s post, I’m going to walk you through building a queue in C, talk about how to effectively use a queue, and also compare to the Queue implementation that ships with Ruby. What is a Queue? While the
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