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Brian McKenna

@handle.invalid

Functional programming, electric vehicles, renewable energy, Tasmania 🌉 bridged from ⁂ mastodon.social/@puffnfresh, follow @ap.brid.gy to interact

Posts Replies Media

Brian McKenna @puffnfresh.mastodon.social.ap.brid.gy · 21/10/2026

Vindicated for my absolute refusal to run any #PHP on my #homelab. A few times I've been recommended Grocy and I think maybe I'm being unreasonable. But I just have too much experience with PHP to execute it ever again.

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Brian McKenna @puffnfresh.mastodon.social.ap.brid.gy · 02/10/2026

I've used #Meshtastic for years but now there's #MeshCore repeaters all around #Tasmania. I've just added a Wio Tracker L1 to our railway vehicle. Reports the GPS position of the vehicle via MeshCore telemetry back to our headquarters. Not sure if we'll need […] [Original post on mastodon.social]

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Brian McKenna @puffnfresh.mastodon.social.ap.brid.gy · 01/10/2026

Turbo #Haskell, a JVM backend from Kmett: comonad.com/reader/2026/turbo-haske…

comonad.com

Turbo Haskell

Exactly a week ago (as a joke), I started writing THC, my “Turbo Haskell compiler,” while on vacation visiting Bartosz Milewski.

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Brian McKenna @puffnfresh.mastodon.social.ap.brid.gy · 29/09/2026

@shtrom awesome, I'll give it a go, thanks!

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Brian McKenna @puffnfresh.mastodon.social.ap.brid.gy · 19/09/2026

@bodil "Half-Life Alyx, which is basically a tech demo..." totally lost me there. Amazing game, and in line with the Half Life series, which I guess is a bit about demoing tech, but not in a bad way. But paying $1600AUD to play Alyx again, without wires, would be a waste.

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Brian McKenna @puffnfresh.mastodon.social.ap.brid.gy · 17/09/2026

Most of my work at Obsidian Systems is operations related. Nix, Kubernetes, CI/CD, Prometheus, Grafana, etc. to run the Canton Network. It's written in Scala, which I usually don't have to deal with, but yesterday we had an incident from stack overflows and the stack trace exactly fit my area […]

mastodon.social

Original post on mastodon.social

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Brian McKenna @puffnfresh.mastodon.social.ap.brid.gy · 14/08/2026

@chris__martin been deploying Nix-based Docker images to production for a decade now. Just too good.

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Brian McKenna @puffnfresh.mastodon.social.ap.brid.gy · 05/06/2026

I've been working on continually exporting #Haskell's stack traces to pprof format, making GHC compatible with existing tools, e.g. Pyroscope, Speedscope, etc. Simple tests give it about a 2% overhead on a silly Scotty/HTTP example app. That brings it in […] [Original post on mastodon.social]

Haskell call graphs in Grafana Pyroscope.

Haskell call stack visualised with "go tool pprof"

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Brian McKenna @puffnfresh.mastodon.social.ap.brid.gy · 29/05/2026

Discovered a GHC bug when trying to add continuous profiling to some Obsidian Systems #Haskell code: gitlab.haskell.org/ghc/ghc/-/issues…

gitlab.haskell.org

`-finfo-table-map` causes spurious `-Wincomplete-uni-patterns` warnings (#27314) · Issues · Glasgow Haskell Compiler / GHC · GitLab

Summary Since GHC 9.14, enabling -finfo-table-map causes the pattern-match checker to emit a warning on patterns which make use of...

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Brian McKenna @puffnfresh.mastodon.social.ap.brid.gy · 24/05/2026

Electric railway vehicle schematic. Some more details: * Hyundai Kona EV battery modules * QS165 motor (used in electric motorbikes, e.g. modded Surrons) * FarDriver ND72450 controller (also used for motorbikes) * 14 tooth 428 motor sprocket to 60 tooth axle […] [Original post on mastodon.social]

Schematic of an electric railway vehicle

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Brian McKenna @puffnfresh.mastodon.social.ap.brid.gy · 24/05/2026

Did 42km (7 trips) on the electric railway lawn mower yesterday. Between each trip I managed to charge the vehicle for about 20 minutes. Started the day with about 80% battery. Ended the day with about 75%. The vehicle has about 12kWh of capacity. Ridiculously large.

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Brian McKenna @puffnfresh.mastodon.social.ap.brid.gy · 23/05/2026

Yesterday was the public launch of the Launceston & North East Railway's "railbug" rides. We were fully booked out and had a very successful day. I spoke on ABC Northern Tasmania's breakfast program and had the front page photo for the local newspaper […] [Original post on mastodon.social]

Electric railway vehicle pushing a pedal vehicle up a track, through the Tasmanian bush.

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