Hacker News: larsnystrom

New comment by larsnystrom in "Java is fast, code might not be"

larsnystrom — Wed, 01 Apr 2026 07:37:51 +0000

I remember now what the problem was. I was instantiating a new ArrayList in a loop. The solution to the performance issue was to use a Vector instead. I was used to just writing PHP arrays when I wanted a list of something, and since they’re dynamically sized I thought the analogue in Java was ArrayList, which is also dynamically sized. But somehow that was extremely unperformant in Java.

New comment by larsnystrom in "Java is fast, code might not be"

larsnystrom — Fri, 20 Mar 2026 19:11:56 +0000

I remember writing Java for our introductory programming course at university around 2010. I was already familiar with object oriented programming in PHP at the time, so I just wrote the Java code like I would write PHP. I was absolutely astounded at the poor performance of the Java app. I asked one of our tutors and I can still remember him looking at the code and saying something along the lines of ”oh, you’re instantiating objects in a loop, that’s obviously going to be slow”. Like, what? If I can do this performantly in freakin PHP, how can Java, the flagship of OOP, not have fast instantiation of objects? I’m still shaking my head thinking about it.

New comment by larsnystrom in "Edge.js: Run Node apps inside a WebAssembly sandbox"

larsnystrom — Tue, 17 Mar 2026 19:45:24 +0000

Maybe I’m just dense, but it says the fs module is fully supported, so what happens when I try to read a file from disk if the app is fully sandboxed?

New comment by larsnystrom in "If you thought the code writing speed was your problem; you have bigger problems"

larsnystrom — Tue, 17 Mar 2026 19:31:47 +0000

I can really relate to this. At the same time I’m not convinced cycle time always trumps throughput. Context switching is bad, and one solution to it is time boxing, which basically means there will be some wait time until the next box of time where the work is picked up. Doing time boxing properly lowers context switching, increases throughput but also increases latency (cycle time). It’s a trade-off. But of course maybe time boxing isn’t the best solution to the problem of context switching, maybe it’s possible to figure out a way to have the cookie and eat it. And maybe different circumstances require a different balance between latency and throughput.

New comment by larsnystrom in "Notes on writing Rust-based Wasm"

larsnystrom — Sun, 08 Mar 2026 12:07:47 +0000

WASM is kind of like Java bytecode, right? A compilation target which requires a runtime? But better sandboxed?

New comment by larsnystrom in "Tesla registrations crash 17% in Europe as BEV market surges 14%"

larsnystrom — Tue, 24 Feb 2026 19:41:50 +0000

It’s still possible to order new and original parts for SAAB models, almost 20 years after they went under. The spare parts are made by a separate company which is still going.

New comment by larsnystrom in "Sub-$200 Lidar could reshuffle auto sensor economics"

larsnystrom — Mon, 23 Feb 2026 12:28:06 +0000

Human eyes are much better than cameras at dealing with dynamic range. They’re also attached to a super-computer which has been continuously trained for many years to determine distances and classify objects.

New comment by larsnystrom in "France dumps Zoom and Teams as Europe seeks digital autonomy from the US"

larsnystrom — Tue, 03 Feb 2026 17:55:49 +0000

There seems to be a huge business opportunity in Europe right now, to sell support and customization of open source software to government players. Has anyone heard about a European company that’s been successful in this area?

New comment by larsnystrom in "Nine things I learned in ninety years"

larsnystrom — Tue, 23 Sep 2025 11:30:00 +0000

On the other hand, many things attributed to chance are actually the aggregate effect of other people's choices. If we make choices based on not just what's best for ourselves but what's best for all of us, we will all suddenly become more "lucky". And vice versa, if we only think about ourselves that luck will diminish.

New comment by larsnystrom in "Modern Node.js Patterns"

larsnystrom — Mon, 04 Aug 2025 10:23:33 +0000

And AFAIK there is still no upload progress with fetch.

New comment by larsnystrom in "Show HN: Unregistry – “docker push” directly to servers without a registry"

larsnystrom — Thu, 19 Jun 2025 06:49:10 +0000

Nice to only have to push the layers that changed. For me it's been enough to just do "docker save my-image | ssh host 'docker load'" but I don't push images very often so for me it's fine to push all layers every time.

New comment by larsnystrom in "Finland announces migration of its rail network to international gauge"

larsnystrom — Tue, 20 May 2025 09:58:46 +0000

Yes, it is because of NATO. They've been thinking about it for some time, but NATO tipped the scales.

New comment by larsnystrom in "The cryptography behind passkeys"

larsnystrom — Thu, 15 May 2025 08:40:18 +0000

Please do share some links to these events, because this is the first I hear of it.

New comment by larsnystrom in "The cryptography behind passkeys"

larsnystrom — Thu, 15 May 2025 08:37:57 +0000

Sure, but TOTP still defends against password leakage. So it’s still more secure than only using a password.

New comment by larsnystrom in "Apple violated antitrust ruling, judge finds"

larsnystrom — Fri, 02 May 2025 13:28:40 +0000

Allowing third party payment systems does not mean they have to be less strict in the rest of their app vetting process.

New comment by larsnystrom in "Apple violated antitrust ruling, judge finds"

larsnystrom — Thu, 01 May 2025 12:51:13 +0000

But this is from a non-Apple app. You’re already on a page outside of Apples control.

New comment by larsnystrom in "Apple violated antitrust ruling, judge finds"

larsnystrom — Thu, 01 May 2025 12:39:16 +0000

Why are they using any language at all? Why not just let the app maker open the payment screen directly?

New comment by larsnystrom in "Carefully but Purposefully Oxidising Ubuntu"

larsnystrom — Thu, 13 Mar 2025 13:57:45 +0000

> Performance is a frequently cited rationale for “Rewrite it in Rust” projects. While performance is high on my list of priorities, it’s not the primary driver behind this change.

Is performance a frequent rationale for rewriting C applications in Rust?

New comment by larsnystrom in "VSCode’s SSH agent is bananas"

larsnystrom — Sat, 08 Feb 2025 17:33:48 +0000

But vscode doesn’t just let you edit files on the remote, it runs everything on the remote: extensions, terminal commands, etc. If you’re working on a web project, it forwards ports so you can still visit localhost in your browser, even though your dev server is running on the remote host.

New comment by larsnystrom in "VSCode’s SSH agent is bananas"

larsnystrom — Sat, 08 Feb 2025 07:50:31 +0000

Where is the Remote SSH extension code? I always thought that was closed source?

Edit: The reason I think it is closed source is because a StackOverflow answer says so[1]. I’d be very interested in seeing the code if you could link to its repo!

[1] https://stackoverflow.com/a/55979526