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What is a Scheduler Anyways? Table of Contents 1. So What Happened? 2. Lavd 3. Erlang Schedulers 4. The Problem Last year, we had an outage that got detailed in the Linux Plumbers Conference: https://www.youtube.com/watch?v=KFItEHbFEwg , where a deployment of Lavd broke the Erlang runtime that had CPU pinning enabled. As part of this, I wanted to learn more about the interplay between these two…
Hot Reloading Code in Erlang: How Does It Work? Table of Contents 1. How does Erlang store code? 2. Basic state migration 3. Okay, now do it with TCP 4. This sounds like a maintenance nightmare, why would you do this to yourself? Engine schematic for the Paraguay Railway. I took this back in December 2024. Hot reloading is a bit like swapping out the engine while the train is moving. A while back,…
Reading List Table of Contents 1. January 2026 2. November 2025 3. October 2025 4. August 2025 5. May 2025 6. April 2025 7. January 2025 8. December 2024 9. November 2024 10. October 2024 11. September 2024 12. August 2024 13. June 2024 14. May 2024 15. April 2024 16. March 2024 17. Feburary 2024 18. January 2024 19. December 2023 20. November 2023 21. October 2023 22. September 2023 23. August…
Post-mortem, 2025 Edition Table of Contents 1. Travel 2. Work 3. Learning 4. Life Damascus, Jan 2025. Another year, another performance review season to procrastinate on. I felt like I largely locked in this year on work, so the scorecard is: 1. Travel In January I went to Syria , spending about a month there and bopping around Sayyida Zaineb. The experience was incredible, especially only a month…
Dilettantes and Polymaths this post is far more rambling than my regular ones It's been a year. Normally I'd write up something wrapping up about my goals and how far I accomplished, but I think for me this year was one long lesson in understanding the difference between being a dilettante and a polymath. I've always been terrified of being a dilettante, mostly because it creates some sort of…
Fieldnotes Table of Contents 1. Central America 2. South America 3. Middle East and North Africa Midnight volleyball in Fort Washington Park, 2021. Some fieldnotes from various places I've lived in. I usually will write up a section for any country I've lived for more than a month in. 1. Central America El Salvador 2. South America Uruguay Argentina 3. Middle East and North Africa Iraq Syria…
Pret's Fruit Cup I prod the strawberry with my fork. It's actually half of a strawberry, sliced in twain by some machine at some indeterminate time ago. The plastic cup it came in promised "organic" and "fresh daily", although I figure companies like Pret probably have redefined "daily" in terms of elephant years or something. The bottom tip of the strawberry's red flesh is a bit mushy, but also…
Read the Damn Error Message Table of Contents 1. Example 1.1. Tracebacks is a structured logs 1.2. Read the actual error 1.3. Check the filenames, switch the reading order 1.4. Print it (or use pdb) 2. Debugging Mentality I've been working on a project for grad school, and through watching my teammates, I've seen them exhibit some of the same behaviors I see juniors do. The most frustrating one is…
Shrines Table of Contents 1. Locations: 1. Locations: Photographs of various shrines I've seen. A shrine here is basically anything I consider to have spiritual significance. < 2021:07:21 09:55:40 > - < 36.7586833333333, 43.8936416666667 > < 2021:07:21 11:25:05 > - < 36.7682833333333, 43.8941166666667 > < 2025:05:04 09:07:04 > - < 36.7849083333333, 3.06117222222222 > < 2019:07:05 16:42:06 > - <…
El Salvador Table of Contents 1. Fiestas de Agosto 1.1. Mass on the 6th 2. Romero 3. Misc 4. Wrap I just came back from three weeks in El Salvador. You land to a giant sign that says "El Salvador, the Land of Smiles," which might be a stretch. Summer means rain most afternoons; thunderstorms drift through most evenings for an hour or two. I spent three weeks in the city for the Fiestas de Agosto…