pdm install is slow on python3.12

[reuvenstr]

Hi,
Is there a way to debug why self-install takes so long?
Before upgrading to Python 3.12, it took 10 minutes on Python 3.10, but after the upgrade, the times increased significantly.
When I run pdm install, it takes 30 minutes, but with pdm install --no-self, it only takes 14 minutes.
I still haven’t tried uv, because it seems the problem is not related to package downloads.

Forgot to mention, using pdm 2.26.1 and

[build-system]
requires = ["pdm-backend==2.4.6"]
build-backend = "pdm.backend"

[frostming]

How long does it take to run pdm build?

[reuvenstr]

Looks like it took more time to build, rather then install
3.12 almost 1 hour
3.10 6 minutes

[anntnzrb]

Run pdm build to diagnose the root cause - if it's slow (>10 minutes), the issue is your build backend or configuration, not PDM's dependency resolution. Check your [build-system] in pyproject.toml and consider: 1) switching to a faster backend like pdm-backend or hatchling, 2) ensuring build dependencies are minimal, 3) avoiding dynamic metadata that requires SCM queries. The --no-self timing difference (14 vs 30 min) suggests build performance is the bottleneck.

[reuvenstr]

checked content of whls
python3.12 171341124 bytes 7621 files
python3.10 174576984 bytes 8381 files

[frostming]

It looks like a heavy binary wheel with 174 MB.
Please check the binary building process to see if there is any slowness.
Since you keeps posting minimum information I can't spot any from it.

[reuvenstr]

Can you please provide some information on what to look during building process?
Currently i switched to hatching build backend, it takes 30 seconds to build whl

[frostming]

Currently i switched to hatching build backend, it takes 30 seconds to build whl

Are there any difference in file included? The file number is not sufficient, need to know what specific files are different

[reuvenstr]

Looks similar, needed to change includes/excludes because of hatching syntax
There are some missing files, because of how hatching handles it, finding way to fix it