[tinco]

> That's not how anything works. Different languages will perform differently on IO work, different runtimes will degrade under IO differently, etc. That's why even basic echo HTTP servers perform radically differently in Python vs Rust.

> This isn't how computers work and it's not even how math works.

What are you disagreeing with? There's some baseline amount of I/O that the kernel does for you, that's what I'm assuming is 50ms, and everything else like runtime degrading is overhead due to the language/platform choice. I'm saying Rust is upwards of 100x faster in that regard thanks to its zero cost abstraction philosophy. You can't just include the I/O baseline in a claim about Rust's performance advantage. You'll be really disappointed when Rust doesn't download your files 100x as fast as the Python file downloader.

Anyway, I'm sorry I provoked your antagonism with my terse messages, I wasn't trying to be blase. I believe uv is the sort of tool that wouldn't suffer much from the downsides of Python and that in most situations the reduced runtime overhead of Rust would have a negligible impact on the user experience. I'm not arguing that they shouldn't build uv in Rust. Most situations is not all situations, and when a tool is used so widely you'll hit all edge cases, from the point where the 10s of milliseconds of startup time matters to the point where Pythons I/O overhead matters at scale.

[staticassertion]

I think a missing piece here is that you think that Rust won't download a file faster than Python but it absolutely can. This seems to just be a misconception people have about IO, like "download a file" is a thing that exists wholly outside of your process.

[tinco]

I know it can, but it can't download it faster than the network card can write it into its buffers. That's the part I would count as the 50ms that both can't improve upon.

[staticassertion]

Of course. But why would that matter if Python can't get there to begin with? You're not going to hit NIC bottlenecks with Python, not without a ton of work and tradeoffs at least.