Comment by kibwen
11 hours ago
> This is interesting in that I wouldn't expect that the typical resolution involves a particularly large quantity of TOML.
I don't know the details of Python's resolution algorithm, but for Cargo (which is where epage is coming from) a lockfile (which is encoded in TOML) can be somewhat large-ish, maybe pushing 100 kilobytes (to the point where I'm curious if epage has benchmarked to see if lockfile parsing is noticeable in the flamegraph).
But once you have a lock file there is no resolution needed, is there? It lists all needed libs and their versions. Given how toml is written, I imagine you can read it incrementally - once a lib section is parsed, you can download it in parallel, even if you didn't parse the whole file yet.
(not sure how uv does it, just guessing what can be done)
For whatever it's worth, the toml library uv uses doesn't support streaming parsing: https://github.com/toml-rs/toml/issues/326