Posts by Jeremiah Peschka

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Jeremiah Peschka
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Remapping Keys in Linux

Jeremiah Peschka
2 Comments
Our Goal: Automatic Remapping This is mainly a reminder so that I don’t forget how I set up automatic key remapping under Linux. Let’s face it: nobody remembers all of the steps to set up a new laptop and I don’t want to spend the same amount of time solving this problem in the future…
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Photo by Wyron A on Unsplash

Cheese as a Number

Jeremiah Peschka
2 Comments
In which we have fun with C’s type system. Building Blocks C is a basic building block of modern computer systems. Operating systems are written using C. Database software is written using C. Drivers are written in C. Saying “cheese” won’t help you when your printer thinks it’s a mouse. What’s problematic about C as…
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Division Without Division

Jeremiah Peschka
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Not all processor architectures support the division operation. What if you’re writing software for one of these CPUs and you need to support arbitrary division? We’re in luck: we can perform the same operations that the CPU would perform. At least this thing can divide… It’s possible to perform division using a combination of left…
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Spinlocks: like regular padlocks, but with more spinning.

Spinlocks and You

Jeremiah Peschka
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Spinlocks are a building block of concurrent programs. As long as you have more than one actor in your system, you’re going to need to be able to control access. We use spinlocks to maintain mutual exclusion – if process 1 is changing something in memory, we want to prevent all other processes from doing…
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Picking Fights in Unity

Jeremiah Peschka
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As a fun summer project, I’m working on a Rogue-like video game. While our overall goal is to keep ourselves entertained while we learn something new, we’re keeping a careful approach to writing our software. Over the last week, we’ve decided it was time to implement combat. Rogue-like Redux If you play video games and…
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An empty stadium

There Is No Delete

Jeremiah Peschka
1 Comment
I don’t have any Apple devices. I used to own a bunch of them, but over time I’ve switched from an iPhone to a Nexus phone; I have an Android tablet; my laptop and desktop both run Linux. Somewhere along the way, I decided that I should either delete my old Apple ID or remove…
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A dancing robot

Musings on OOP

Jeremiah Peschka
4 Comments
N.B. This was originally written as a term paper for Portland State University’s CS202 – Programming Systems course. I’ve been working with object oriented programming (OOP) and software development for longer than I’d care to admit. I’ve found OOP to be cumbersome and prone to odd behavior. Shared mutable state has caused me a lot…
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PostgreSQL Data Checksums

Jeremiah Peschka
2 Comments
If you use SQL Server, you’re used to the database doing page verification for you as the sensible default. If you want SQL Server to not verify data, you have to do a bit of extra work. Naturally, I would’ve assumed that this was the case with other databases since, after all, having good data on…
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How I Computer

Jeremiah Peschka
14 Comments
I figured it would be fun to document the hardware and software that I use to get everything done on a regular basis. Even if it’s for nobody but future me, this should be a fun post to review later. Pictured: the computer I actually need. The Desktop I built the desktop computer myself, so…
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This is Jeremiah

I live in Portland, OR. I have two dogs.

I'm a PhD student at Portland State University where I science the computers.

I'm was Microsoft MVP from 2009 - 2018 with a pile of certifications. Somewhere along the way, I wrote a database client for Riak and then handed it off to the community.

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