🦜 Tech Blog - Matthew Gaudet
@www.mgaudet.ca.technical@rss-parrot.net
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<p>Blogging about technical stuff, work, etc.</p>
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Getting myself out of a sticky jujutsu situation
https://www.mgaudet.ca/technical/2025/7/25/getting-myself-out-of-a-sticky-jujutsu-situation
Published: July 25, 2025 17:36
So I managed to get myself into a sticky situation with JJ where I had squashed together a whole bunch of crappy commits with the intention of then taking the large one and cutting it apart. So I squashed, rebased, then started cutting it apart... only to…
Finding hot allocation sites with bpftrace
https://www.mgaudet.ca/technical/2025/5/28/finding-hot-allocation-sites-with-bpftrace
Published: May 28, 2025 20:58
So, last time I said I was hooked, and that I wrote an allocation profiler.
That’s true! And it was comparatively easy.
Starting from the baseline of SpiderMonkey which sleeps before exit from the last blog post, the profiler looks like this:
BEGIN
{
…
Exploring a language runtime with bpftrace
https://www.mgaudet.ca/technical/2025/5/28/exploring-a-language-runtime-with-bpftrace
Published: May 28, 2025 16:42
So I have been having quite a bit of fun learning about eBPF. It’s been on my todo list for like two or three years, but I’ve finally made the time to actually start to figure it out, and have already found some neat stuff, and had to do some fun hacking. …
A Performance Investigation Challenge
https://www.mgaudet.ca/technical/2025/5/9/a-performance-investigation-challenge
Published: May 9, 2025 20:24
I really liked matklad’s Performance Visualization challenge (partially because it didn’t take me long to find the line with samply, which made me feel good).
Here’s a skills gap or research question perhaps: How do you identify an impactful but diffuse…
Learning about C++ Direction Setting
https://www.mgaudet.ca/technical/2025/5/9/learning-about-c-direction-setting
Published: May 9, 2025 16:03
Another blog post written wearing only my hat, rather than any Mozilla or TC39 Delegate related hats
Last year while considering some JavaScript standards evolution, I wanted to look into how C++ handles some of the challenges. I dug through some…
Upgrade issue with jujutsu
https://www.mgaudet.ca/technical/2025/4/17/upgrade-issue-with-jujutsu
Published: April 17, 2025 20:46
Trying to update jujutsu I had a heck of a time. A previously working command stopped working. Running in a different directory, updating rust neither worked. The issue is this commit in the jujutsu repo. The symptom is:
…
32 Bit Build of SpiderMonkey -- First in a while
https://www.mgaudet.ca/technical/2025/4/14/32-bit-build-of-spidermonkey-first-in-a-while
Published: April 14, 2025 21:03
Some quick notes on doing a recent 32 bit build of SpiderMonkey
Mozconfig:
ac_add_options --target=i686-pc-linux
ac_add_options --enable-application=js
ac_add_options --disable-optimize
ac_add_options --enable-debug…
User Defined Primitives: A Sketch
https://www.mgaudet.ca/technical/2025/2/24/user-defined-primitives-a-sketch
Published: February 24, 2025 16:39
The following is written in my Personal capacity, and does not represent the views of the SpiderMonkey team, Mozilla, TC39 or any other broader group than just what’s between my ears. I wear no hats here.
I want to propose a little thought experiment for…
Making Teleporting Smarter
https://www.mgaudet.ca/technical/2025/2/20/making-teleporting-smarter
Published: February 20, 2025 23:08
(This is a republish of an article posted at SpiderMonkey.dev for my own archiving purposes)
Recently I got to land a patch which touches a cool optimization, that I had to really grok. As a result, I wrote a huge commit…
5 Years of Compiler Jobs
https://www.mgaudet.ca/technical/2024/12/19/5-years-of-compiler-jobs
Published: December 19, 2024 16:37
Turns out I missed the 5 year anniversary of my CompilerJobs page by a little more than a week.
From the initial commit, myself and many helpful contributors have
Made 308 Commits
Listed 196(!!) companies; not including companies who have come and gone…