uv python install consumes a lot of memory

[jooon]

While investigating #10057 and rerunning the uv python install command to get a shorter test case I noticed uv became slower and slower the more I used it. It seems to read and rewrite a _sysconfigdata__linux_x86_64-linux-gnu.py file which keeps getting bigger and bigger for every run.

$ uv --version
uv 0.5.11
$ uv python uninstall --all
Searching for Python installations
No Python installations found
$ time (for i in {1..25}; do uv python install 3.12.8; done)
Installed Python 3.12.8 in 1.06s
 + cpython-3.12.8-linux-x86_64-gnu

real	0m27.687s
user	0m17.309s
sys	0m8.580s
$ cd /home/jon/.local/share/uv/python/cpython-3.12.8-linux-x86_64-gnu/lib/python3.12/
$ du -hs _sysconfigdata__linux_x86_64-linux-gnu.py
2.3G	_sysconfigdata__linux_x86_64-linux-gnu.py

[jooon]

Tested some old versions. Looks like it was introduced in uv 0.5.9.

[jooon]

That's a lot of backslashes :)

I guess the bug is somewhere here, but I can't see it.

uv/crates/uv-python/src/sysconfig/parser.rs

Line 161 in cf14a62

fn parse_string(cursor: &mut Cursor, quote: char) -> Result<String, Error> {

[zanieb]

Thanks for the report!

[charliermarsh]

Noooooooo