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The fact that fixing and diagnosing often converge to the same actions doesn't change the fact that these two concurrent activities have different goals. The goal of fixing is to bring the system into line with your mental model of how it's supposed to function. The goal of diagnosing is to bring your mental model into line with the way the system is actually behaving.
a year ago

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More from Dan Slimmon

Lecture: Queueing theory on a cocktail napkin

Queues are everywhere, and they follow mathematical rules. Learn a few of those rules! It'll go a long way to making you a stronger SRE.

2 weeks ago 16 votes
did u ever read so hard u accidentally wrote?

Owning a production Postgres database is never boring. The other day, I’m looking for trouble (as I am wont to do), and I notice this weird curve in the production database metrics: So we’ve got these spikes in WALWrite: the number of processes waiting to write to the write-ahead log (or “WAL”). The write-ahead log … Continue reading did u ever read so hard u accidentally wrote?

3 months ago 38 votes
Is ops a bullshit job?

I recently had the pleasure of reading anthropologist David Graeber’s 2018 book, Bullshit Jobs: A Theory. Graeber defines a bullshit job as, a form of paid employment that is so completely pointless, unnecessary, or pernicious that even the employee cannot justify its existence even though, as part of the conditions of employment, the employee feels … Continue reading Is ops a bullshit job?

5 months ago 69 votes
Incident SEV scales are a waste of time

Ask an engineering leader about their incident response protocol and they’ll tell you about their severity scale. “The first thing we do is we assign a severity to the incident,” they’ll say, “so the right people will get notified.” And this is sensible. In order to figure out whom to get involved, decision makers need … Continue reading Incident SEV scales are a waste of time

5 months ago 53 votes
The queueing shell game

Queues are not just architectural widgets that you can insert into your architecture wherever they're needed. Queues are spontaneously occurring phenomena, just like a waterfall or a thunderstorm.

10 months ago 92 votes

More in programming

Computers Are a Feeling

Exploring diagram.website, I came across The Computer is a Feeling by Tim Hwang and Omar Rizwan: the modern internet exerts a tyranny over our imagination. The internet and its commercial power has sculpted the computer-device. It's become the terrain of flat, uniform, common platforms and protocols, not eccentric, local, idiosyncratic ones. Before computers were connected together, they were primarily personal. Once connected, they became primarily social. The purpose of the computer shifted to become social over personal. The triumph of the internet has also impoverished our sense of computers as a tool for private exploration rather than public expression. The pre-network computer has no utility except as a kind of personal notebook, the post-network computer demotes this to a secondary purpose. Smartphones are indisputably the personal computer. And yet, while being so intimately personal, they’re also the largest distribution of behavior-modification devices the world has ever seen. We all willing carry around in our pockets a device whose content is largely designed to modify our behavior and extract our time and money. Making “computer” mean computer-feelings and not computer-devices shifts the boundaries of what is captured by the word. It removes a great many things – smartphones, language models, “social” “media” – from the domain of the computational. It also welcomes a great many things – notebooks, papercraft, diary, kitchen – back into the domain of the computational. I love the feeling of a personal computer, one whose purpose primarily resides in the domain of the individual and secondarily supports the social. It’s part of what I love about the some of the ideas embedded in local-first, which start from the principle of owning and prioritizing what you do on your computer first and foremost, and then secondarily syncing that to other computers for the use of others. Email · Mastodon · Bluesky

2 days ago 3 votes
New Edna feature: multiple notes

I started working on Edna several months ago and I’ve implemented lots of functionality. Edna is a note taking application with super powers. I figured I’ll make a series of posts about all the features I’ve added in last few months. The first is multiple notes. By default we start with 3 notes: scratch inbox daily journal Here’s a note switcher (Ctrl + K): From note switcher you can: quickly find a note by partial name open selected note with Enter or mouse click create new note: enter fully unique note name and Enter or Ctrl + Enter if it partially matches existing note. I learned this trick from Notational Velocity delete note with Ctrl + Delete archive notes with icon on the right star / un-star (add to favorites, remove from favorites) by clicking star icon on the left assign quick access shortcut Alt + <n> You can also rename notes: context menu (right click mouse) and This note / Rename Rename current note in command palette (Ctrl + Shift + K) Use context menu This note sub-menu for note-related commands. Note: I use Windows keyboard bindings. For Mac equivalent, visit https://edna.arslexis.io/help#keyboard-shortcuts

2 days ago 3 votes
Thoughts on Motivation and My 40-Year Career

I’ve never published an essay quite like this. I’ve written about my life before, reams of stuff actually, because that’s how I process what I think, but never for public consumption. I’ve been pushing myself to write more lately because my co-authors and I have a whole fucking book to write between now and October. […]

3 days ago 10 votes
Single-Use Disposable Applications

As search gets worse and “working code” gets cheaper, apps get easier to make from scratch than to find.

3 days ago 8 votes