Holly Cummins
@hollycummins.com
2.9K followers 300 following 360 posts
@RedHat - Senior Principal Software Engineer, working on Quarkus. Ex-IBM. Java Champion, developer, author, #cloud surfer and maker. My views are my own.
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hollycummins.com
Darn. I should have worn my "assume all women are technical and can breathe fire" t-shirt.
hollycummins.com
I didn't have a chance to show this (generated in 13ms with a quarkus + picocli) in my #Devoxx talk:
A grumpy cat meme saying "I ate a Devoxx sandwich/It was awful"
hollycummins.com
It's even funnier on a smaller model:
hollycummins.com
I just tried to reproduce @janelleshane.com's brilliant "make an LLM apologise for suggesting a giraffe as CEO" experiment. It 100% worked on Ollama.

Which is bad, because when I read it I did an involuntary shriek of laughter, and woke a sleeping puppy, and now I won't be able to do more work.
hollycummins.com
As if you didn't have enough reasons to dislike commuting ... 😔
hollycummins.com
InfoQ have published "The Efficiency Paradox," complete with transcript.
Apparently I said things like:
- "Am I optimizing for the right thing, or should I maybe be just a little bit more jellyfish?"
- "If you do the same experiment to your stool, it's much less cruel"
www.infoq.com/presentation...
The Efficiency Paradox and How to Save Yourself and the World
Holly Cummins discusses how to eliminate waste in software development. She shares strategies like "LightSwitchOps" and build-time initialization to improve machine efficiency. She explains how these ...
www.infoq.com
hollycummins.com
Expected: is "Hello from Quarkus REST"
Actual: , Skibidi., Skibidi., Skibidi., Skibidi., Skibidi., Skibidi., Skibidi., Skibidi., Skibidi., Skibidi., Skibidi., Skibidi., Skibidi., Skibidi., Skibidi., [many more Skibidis]., Skibidi., Skibidi., Skibidi., Skibidi., Skibidi.. This demo is dog water.
😳
hollycummins.com
There's no sense crying over spilled milk, but spilled coffee?

That's *definitely* worth crying over.
hollycummins.com
Switching to paying by dry weight eliminated the whole cycle of "farmer spends money to increase water content of potatoes" followed by "Walkers spends money to dry out potatoes". Reduced costs for both sides, reduced carbon footprint – double-double win.
hollycummins.com
When Walkers analysed the carbon footprint of their crisp production, they discovered a big cost in drying out potatoes. Why were the potatoes wet? They paid farmers by wet weight, which created an incentive for farmers to increase humidity.
Solution? Pay by dry weight. 🧵
Reposted by Holly Cummins
jamesrball.com
The even more unbelievable crime fact (which I learned relatively recently) is that burglary has fallen by more than 90% since the 1990s.

Did anyone notice? Nope. Does anyone believe it? Nope. But is is true? It is!
tom-clark.bsky.social
Useful reminder from Peter Kellner on the problems we refuse to acknowledge are getting better, and the politics of hopelessness that this breeds

open.substack.com/pub/kellnerp...
Reposted by Holly Cummins
janrosenow.bsky.social
It's absolutely astonishing: In just about 13 years, Norway has skyrocketed from virtually no sales of zero-emission battery electric vehicles to nearly 100% of all new passenger car purchases.
hollycummins.com
*Lots* of goodness ⬇️
www.infoq.com/podcasts/neu...

"Context switching is going to impair your decision-making. So maybe don't make any big business-critical decisions if you have nine hours of meetings back-to-back because you're going to probably do a suboptimal choice making in that context"
The Myth of 100% Utilization: The Neuroscience of Productive Teams
In this podcast, Shane Hastie, Lead Editor for Culture & Methods, spoke to Shannon Mason about optimizing team productivity by understanding the neuroscience behind cognitive load, distinguishing betw...
www.infoq.com
hollycummins.com
"Octopus-themed crafting event."

That's, um, specialized. But amazing.
hollycummins.com
Portuguese water dog. Although (same as yours!) rocks are her second favourite food. I'm beginning to question everything I thought I knew about natural selection.
hollycummins.com
And [thinks hard about how twins work] happy birthday to *you*, @sharatchander.bsky.social 🎂
hollycummins.com
It's a common myth that dogs are meat-eaters. Based on observation of my puppy, their favourite food is rose bushes.
Reposted by Holly Cummins
kettanaito.com
I want as many developers as possible to experience the joy of refactoring their code when they have a good test suite by their side.

It's infectious. You'd want that feeling all the time.
hollycummins.com
Zombie applications are a big problem, but zombie libraries are bad too. Not sorting out CI and update automation leaves apps vulnerable to security vulnerabilities, but it also leaves them vulnerable to bad, expensive, planet-hurting,performance: thenewstack.io/outdated-pyt...
Outdated Python Versions Cost Companies Millions
Running older versions goes beyond being a technical debt problem; it's a financial hemorrhage bleeding out organizations’ cloud bills.
thenewstack.io
hollycummins.com
Past me submitted an abstract for Devoxx promising six labour-intensive demos, including this, totally sensible, demo: “Benchmark an application against a grapefruit, because metric units aren’t tasty”.

Abstract got accepted. Current me is NOT IMPRESSED with past me.
hollycummins.com
Ooh, cool, I did not!
Reposted by Holly Cummins
gotocon.com
🎙️ On today’s #GOTOpodcast, @trishagee.bsky.social & @charleshumble.bsky.social unpack Professional Skills for Software Engineers:

• Why “soft skills” aren’t soft
• Communication that drives products
• Networking that opens doors

🎧 gotopia.tech/podcast