How does gdb call functions?
(previous gdb posts: how does gdb work? (2016) and three things you can do with gdb (2014)) I discovered this week that you can call C functions from gdb! I thought this was cool because I’d previously thought of gdb as mostly a read-only debugging tool. I was really surprised by that (how does that WORK??). As I often do, I asked on Twitter how that even works, and I got a lot of really useful an
ftrace: trace your kernel functions!
Hello! Today we’re going to talk about a debugging tool we haven’t talked about much before on this blog: ftrace. What could be more exciting than a new debugging tool?! Better yet, ftrace isn’t new! It’s been around since Linux kernel 2.6, or about 2008. here’s the earliest documentation I found with some quick Gooogling. So you might be able to use it even if you’re debugging an older system! I’
"I just want to run a container!"
I wrote “what’s up with containers: Docker and rkt” a while ago. Since then I have learned a few new things about containers! We’re going to talk about running containers in production, not on your laptop for development, since I’m trying to understand how that works in September 2016. It’s worth noting that all this stuff is moving pretty fast right now. The concerns when you run containers in pr
How to spy on a Ruby program
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
Surprises in Ruby HTTP libraries
Hi friends! I was helping decide between some Ruby HTTP client libraries at work, and I learned a couple of things that surprised me (and some decisions I didn’t agree with). I ended up doing a tiny amount of open source archaeology, with interesting results! Let’s learn some things! Ruby HTTP libraries: a taxonomy A HTTP library is conceptually a really simple thing – all HTTP is, for the most pa
How gzip uses Huffman coding
I wrote a blog post quite a while ago called gzip + poetry = awesome where I talked about how the gzip compression program uses the LZ77 algorithm to identify repetitions in a piece of text. In case you don’t know what LZ77 is (I sure didn’t), here’s the video from that post that gives you an example of gzip identifying repetitions in a poem! I thought this was a great demonstration, but it’s only
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