It is hard to debug intermittent issue, since it is usually doesn’t follow any pattern. Usually to debug them we need low level tool to hook up and extract more metrics. In this post, Gitlab shared how they deal with an intermittent issue for 2 years, but getting worse recently so they go to bottom of its with BPF and other techniques

take a high-level look at the architecture of a single Mastodon instance and how different instances communicate. Specifically, we’ll be looking at how the Mastodon network-of-instances might scale.

Building a web analytics service without cookies poses a tricky problem: How do you distinguish unique visitors?

Everytime it comes up I just bite the bullet and use hex format. But what is hsl, rgb, lch? how they really work?

As a software engineer I always try to dabble into hardware, the knowledge of CPU/RAM how they work help me a lot when dealing with IO, performance in softwarwe. Nibbler is a 4 bit CPU built from standard 7400 series logic chips – individual counters, registers, buffers, and gates. It’s an educational example of a simple CPU that’s easy to understand and build, but still capable of running games and other interesting programs. Nibbler is built using wire-wrapping on a 5 x 4 inch (127 x 102 mm) perfboard. The CPU contains 17 chips in total.

Spin HDD working life is hard to predict because of their physical part movement. SSD on other hand have no such part, so should be easiser to predict based on Wear leveling and Total Bytes Written.

Walk through tips for an app with 2000+ tests that does not have a severe flaky test problem

How to get intense multiplayer combat with 1000 units to use just 50kb/s bandwidth. Push JS Perf to the extreme. The result is that with a simple “collision cells” optimization scheme, the overall CPU time of the server thread has been brought down by about 90%.