Today instead of working on CPU profilers, I took the day to experiment with a totally new idea! My idea at the beginning of the day was – what if you could take an arbitrary Ruby process’s PID (that was already running!) and start tracking its memory allocations? Spoiler: I got something working! Here’s an asciinema demo of what happened. Basically this shows a live-updating cumulative view of ru
Hello! We talked about Kubernetes’ overall architecture a while back. This week I learned a few more things about how the Kubernetes scheduler works so I wanted to share! This kind of gets into the weeds of how the scheduler works exactly. It’s also an illustration of how to go from “how is this system even designed I don’t know anything about it?” to “okay I think I understand the basic design de
I love debugging tools. One of the most frustrating things to me is – when I run a Ruby or Python program, I can’t find out what that program is doing RIGHT NOW. You might eagerly interrupt me – julia, you say, you can use pdb! or pry! or rbtrace!. So, let me explain. If I’m running a program on the JVM with PID 4242, I can run jstack -p 4242, and it will print the current stack trace of the Java
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