Reposted by Holly CumminsQuarkus @quarkus.io · 08/10/2026We had a crazy idea: a virtual Quarkus conference. Two half-days, Feb 2–3, 2027, free and online. In true open source fashion, you pick the name — voting is open for two weeks: github.com/quarkusio/qu... #Quarkus #Java 076 7
Holly Cummins @hollycummins.com · 08/10/2026It's not just me! At Brussels Central, I overhead the conductor telling someone "no, Central isn't Midi, you need the next station along." 000 0
Holly Cummins @hollycummins.com · 08/10/2026I presented the talk yesterday at @devoxx.com , and the slides and video (already!) are here: hollycummins.com/when-benchma...hollycummins.comWhen benchmarks go bad - what I learned from measuring performance wrong - Holly CumminsThe world of performance analysis is littered with flawed claims, cognitive biases, dangerous intuitions, and beguiling fallacies. Sadly… 020 2
Holly Cummins @hollycummins.com · 08/10/2026I've learned a *lot* about benchmarking in the past year, mostly by making a lot of mistakes. Here's what I learned (in talk-transcript form): hollycummins.com/benchmarks-g...hollycummins.com 161 6
Holly Cummins @hollycummins.com · 08/10/2026I miss the old days of physical feedback buttons at the exit of conference sessions. 030 3
Reposted by Holly CumminsOle Vedel Villumsen @olevv.bsky.social · 08/10/2026If I am not mistaken, “midi” (literally noon) can mean south in French. I used to have a pen pal who said she lived in the midi, by which she meant the south of France. It’s a bit like in some languages „morning“ means “east” and “evening” “west”. 131 3
Holly Cummins @hollycummins.com · 08/10/2026But don't they think of the poor foreigners when designing these things?! 😂 100 1
Holly Cummins @hollycummins.com · 08/10/2026Ah, I see your point! I googled after posting (doh) and it confirms that midi does more generally mean south in French (in a a colloquial, regional, way). I still can't not map '-midi' to '-central' in my head, though. (Which has led to some transport mishaps in the past.) 🫤 030 3
Holly Cummins @hollycummins.com · 08/10/2026Once again, I am left wondering why Brussels-Midi has a different name in French and Flemish. Not just different words, but semantically different - it's "middle" in French and "south" in Flemish. 🤪 I guess maybe that reflects its position relative to the French and Flemish regions of Belgium? 531 5
Holly Cummins @hollycummins.com · 07/10/2026Best slide clicker ever (short-circuited jumper cables!) from @marianne-h.bsky.social at @devoxx.com 151 5
Reposted by Holly CumminsFoojay, the Friends Of OpenJDK @foojay.io · 05/10/2026In #podcast 102, @hollycummins.com, Andy Damevin, and @frankdelporte.be discuss Foojay's and @quarkus.io move from WordPress to a static site. Lessons learned, technical decisions behind it, and what it means for performance and maintenance. foojay.io/today/foojay... #Java #WebDev #StaticSitesfoojay.ioFoojay Podcast #102: Why Foojay Walked Away From WordPress for Static SitesFoojay walked away from WordPress after six years. Andy Damevin and Holly Cummins join to weigh CMS security and cost against Hugo, Jekyll and Roq. 1102 10
Holly Cummins @hollycummins.com · 01/10/2026I hadn't realised Thoughtworks had dropped Cloud Carbon Footprint. Today's speaker at @greenio-podcast.bsky.social recommends SPRUCE (opensourcegreenops.cloud) instead. 030 3
Holly Cummins @hollycummins.com · 01/10/2026Should we worry about the impact of wind farms on birds? No, we should worry about the impact of cats. And windows. Compared to those two, the impact of wind farms is basically zero. At Green IO London, and learning lots already. @greenio-podcast.bsky.social 091 9
Holly Cummins @hollycummins.com · 24/09/2026Yes, I think that's the way – our tooling needs to get better at integration and delegation. Claude does it a bit by having ! to shell out commands, without having to be interpreted-by-llm first. The output still gets interpreted, which seems wasteful, but maybe also necessary to keep context. 110 1
Holly Cummins @hollycummins.com · 24/09/2026They were great! High quality cotton, black, with cute hand-drawn white light-bulbs. I guess maybe the light bulbs were representing enlightenment? 000 0
Holly Cummins @hollycummins.com · 24/09/2026But when it's a *big* task, not a little one mixed in with a bigger LLM flow, cheap determinism is absolutely the way to go. 010 1
Holly Cummins @hollycummins.com · 24/09/2026As a trivial example, using Claude code to change directories or do a git push is ridiculous – when I first heard of people doing that, I was all "this is the end times". But now I sometimes do it too, because doing a push in a different window, or suspending to change directories, causes chaos. ☹️ 220 2
Holly Cummins @hollycummins.com · 24/09/2026I wholeheartedly agree in principle, but in practice, there's a caveat, which is context. If I flip back and forth between an LLM and deterministic tools, the LLM gets 'lost', and I sometimes suspect it burns loads of tokens trying to figure out what happened while it wasn't looking. 210 2
Holly Cummins @hollycummins.com · 22/09/2026I SO want to try this, but I need to figure out where to use it. 040 4
Holly Cummins @hollycummins.com · 21/09/2026I used to have a nice set of pyjamas that were somehow sponsored by his foundation. Or promoting his foundation. Or something. I always found the connection rather surreal. 100 1
Holly Cummins @hollycummins.com · 21/09/2026Charity is an unusually great writer, and an unusually interesting thinker. I've been thinking about this piece, because one of my remote colleagues appears to have been entirely replaced by an LLM. I welcome my helpful new robot colleague, but I kind of miss the old less-helpful human one. 140 4
Holly Cummins @hollycummins.com · 14/09/2026I'm amazed we're not seeing more Sorceror's Apprentice memes and gifs, given how prescient it was. giphy.com/gifs/disney-... giphy.com/gifs/hoppip-...giphy.commickey mouse animation GIF by hoppip - Find & Share on GIPHYDiscover & share this mickey mouse animation GIF by hoppip with everyone you know. GIPHY is how you search, share, discover, and create GIFs. 150 5
Reposted by Holly CumminsMarit van Dijk @maritvandijk.bsky.social · 14/09/2026Last week we hosted #IntelliJIDEA Conf 2026. On day 2 I had the pleasure to host @hollycummins.com and @mthmulders.bsky.social. ICYMI, the recordings are on the @intellijidea.com YouTube channel: www.youtube.com/playlist?lis... 051 5
Reposted by Holly Cumminssarcastic parrot @monkchips.com · 09/09/2026I love this genre "Researchers heated egg yolk and leftover rice until it was a black powder full of tiny holes, then used it to store electricity. They charged it and drained it 10,000 times, and it still held 82.26 percent of what it did the first time."scienceblog.comResearchers heated egg yolk and leftover rice until it was a black powder full of tiny holes, then used it to store electricity. They charged it and drained it 10,000 times, and it still held 82.26 pe...A humble kitchen waste might outlast the batteries powering your phone. 3136 13
Holly Cummins @hollycummins.com · 08/09/202616 new ones last month, in case anyone was wondering. 034 4
Holly Cummins @hollycummins.com · 04/09/2026New book alert: _What Happens When You're Not In The Room_, by Jon Berger. I can recommend it, not on the basis of having read it myself (my copy's in the mail), but on the basis that: - people I trust really rate it - Jon supplied me with me nice wine and nice charcuterie at his London book launch 041 4
Reposted by Holly CumminsDylan Beattie @dylanbeatt.ie · 28/08/2026Today I will be mostly enjoying the fact that according to the Schema.org type system documentation, there are four categories of person: alive, dead, undead, or fictional... 4374 37
Holly Cummins @hollycummins.com · 10/08/2026Mkdocs is probably next, once Jekyll is done: github.com/quarkiverse/...github.comMkdocs converter to Roq · Issue #1118 · quarkiverse/quarkus-roqMkdocs is a niche SSG, but I suspect there's overlap between Quarkus users and Mkdocs users. Some Java projects use Mkdocs for their docs sites. Mkdocs is simpler than Jekyll, so the converter woul... 130 3
Holly Cummins @hollycummins.com · 10/08/2026It would be even better if Poland's grid was cleaner, but every little helps. 010 1
Holly Cummins @hollycummins.com · 10/08/2026"In general, performance on trivial tasks doesn't generalize... it's very easy to make an eval that doesn't say what the creator of the eval seems to think it's saying." TL;DR of Dan's experiments is that token cost is higher with obscure languages and assembly. Beyond that 🤷♀️ danluu.com/pl-tokens/danluu.comHow do programming languages impact token efficiency and correctness? 020 2
Holly Cummins @hollycummins.com · 04/08/2026Ever wished your Quarkus apps automatically used the app name in the banner? Now they can: quarkus.io/blog/quarkus...quarkus.ioCustom ASCII-art startup banners for QuarkusQuarkus: Supersonic Subatomic Java 042 4
Holly Cummins @hollycummins.com · 03/08/2026Not only do you look alike, you even have the same facial expression! 130 3
Holly Cummins @hollycummins.com · 03/08/2026I had so much fun writing this talk. It covers important topics such as poo throughput ("pooput"!), whether teaching COBOL should be considered a crime (Dijsktra thought it should), why Quarkus is so efficient, and what AI is going to do to the job market. www.infoq.com/presentation...infoq.comThe Free-Lunch Guide to Idea CircularityHolly Cummins discusses why "nothing is new under the sun" in tech. She maps historical architectural tradeoffs to modern cloud, microservices, and AI hype cycles. She connects financial debt (post-ZI... 051 5
Holly Cummins @hollycummins.com · 23/07/2026It meets many of the criteria you've listed above. :) 020 2
Holly Cummins @hollycummins.com · 22/07/2026It really is, but if I was making novel planes, in the knowledge that many people fear flying, I wouldn't call my company "Beta technologies." I'd call it something like "Definitely-not-going-to-fall-out-of-the-sky Technologies," or "Quite-sensible Technologies." 010 1
Holly Cummins @hollycummins.com · 17/07/2026After weeks of inspiration-free-blankness, inspiration STRUCK, and I've just submitted something for my final Devoxx CFP slot. I'm so excited about each talk I've put in, I don't want to see any of them rejected 🥹 [s/talk/baby] 080 8
Holly Cummins @hollycummins.com · 15/07/2026Turns out, the word she'd thought meant "remote control" didn't actually mean "remote control," it meant "thingy". Her mom had only ever used it for the remote control, right up until the time she used it to mean the salad. 030 3
Holly Cummins @hollycummins.com · 15/07/2026"Thingy" reminds me of one of my favourite stories. Native-English speaking child, mother speaks a different language. One day, at dinner, child is totally startled when her mom asks her to pass the TV remote control. 🧵 100 1
Holly Cummins @hollycummins.com · 15/07/2026You're right! I didn't think of that before the edit, but I totally should have! 010 1
Holly Cummins @hollycummins.com · 14/07/2026Just spotted I'd submitted a Devoxx proposal that included the phrase "like that thingy tool". Luckily, it's not too late to edit, so my secret is safe. 280 8
Reposted by Holly CumminsJNation 🇵🇹 May 26 & 27 - 2026 @jnationconf.bsky.social · 14/07/2026Should sustainability be treated like performance, reliability or security? Andres Almiray speaks with Patrick Baumgartner about green software and measuring the environmental impact of applications - www.youtube.com/watch?v=Z2BN... . #JNation #Java @andresalmiray.com @patbaumgartner.comyoutube.comPatrick Baumgartner on Green Software, Energy Consumption and Sustainable Development | JNation 2026Can software be measured not only by performance and reliability, but also by its environmental impact? In this interview recorded during JNation 2026, Andres Almiray speaks with Patrick Baumgartner… 053 5
Reposted by Holly CumminsThe Register @theregister.com · 13/07/2026Photovoltaics are still running after a year under Swiss trainstheregister.comPhotovoltaics are still running after a year under Swiss trainsSolar boss reckons challenges are regulatory, not technological 03820 38
Reposted by Holly CumminsDavid Ho @davidho.bsky.social · 13/07/2026Sad that these people died in their beach chairs.news.sky.comMore than 2,700 deaths linked to May and June heatwaves, study suggestsThe analysis found that 42% died as a result of the extra heat caused by human activity - mostly burning fossil fuels. 13561115 561
Holly Cummins @hollycummins.com · 09/07/2026The setting is now firmly switched to "LEAVE MY DESKTOPS WHERE I CAREFULLY PUT THEM ARGH." 😡 030 3
Holly Cummins @hollycummins.com · 09/07/2026Wallpaper is a good idea. I've done it in the past, but forgotten that. It's probably too much effort for this demo because it's a one-off setup each time. But maybe I could automate it. 010 1
Holly Cummins @hollycummins.com · 08/07/2026Captured! @ddoutsiopoulos.bsky.social in action at #RivieraDev, photographing Roberto Cortez 061 6