Cache

Run a command once, reuse its output for a while. once executes a command in your current directory, prints its stdout and keeps it in memory in a small per-user background daemon. Repeated calls with the same command, directory and … Read more

Caching is hard. So hard. But also, we are so fucking bad at it. Every time I have to use a public wifi setup I have a joker moment. Does absolutely nobody test shit on anything less than wired symmetric … Read more

A majority of the GitHub Action workflows we see at Blacksmith use Docker. Whether it is to setup containers to run tests against, or build custom Docker images and push them to a registry, Docker is everywhere. It is also … Read more

It’s common for modern hosts to cache static assets in a flexible, but not most optimal way. Let’s explore why that is and what we can do to push cache performance (for some assets) even further. We’ve got it real … Read more

My colleagues recently wrote a great post on the Netflix tech blog about a tough performance issue they wrestled with. They ultimately diagnosed the problem as false sharing, which is a performance problem that involves caching. I’m going to take … Read more

Consider a strided incrementing loop over an array of size $N=2^{21}$ with a fixed step size of 256: for (int i = 0; i N; i += 256) a[i]++; And then this one, with the step size of 257: for … Read more

Blue jeans gained popularity in the late 19th-century American West due to their durability. Illustration by Meilan Solly / Photos via Fotosearch / Getty Images and Levi Strauss & Co. Archives When Nevada-based tailor Jacob Davis received an order for … Read more

CORS is a necessity for many APIs, but basic configurations can create a huge number of extra requests, slowing down every browser API client, and sending unnecessary traffic to your backend. This can be a problem with a traditional API, … Read more