MUSL version is very slow compared to shared lib one

[inglor]

Is there an existing issue for this?

• I have searched the existing issues

Description of the bug

The musl verison of the application is slow compared to the one using glibc one.

Steps To Reproduce

Execute git-cliff musl and observe being slow

Expected behavior

Same performance as glibc

Screenshots / Logs

No response

Software information

• Operating system: Amazon Linux 2
• Rust version: N/a (downloaded the provided binary)
• Project version: latest

Additional context

No response

[welcome]

Thanks for opening your first issue at git-cliff! Be sure to follow the issue template! ⛰️

[orhun]

I don't have much experience with MUSL but I ran a profiler for comparison:

• GNU: https://share.firefox.dev/3UnZtZX (336ms)
• MUSL: https://share.firefox.dev/4a04i1h (407ms)

There isn't a big difference here. It might be a good idea to investigate the calls though.

Can you share the repo you are running git-cliff with?

[inglor]

Unfortunately no since it's internal at work. But can run profiler myself potentially.

[orhun]

Sounds good (it's samply), let me know.

[orhun]

Here are some instructions:

git clone https://github.com/orhun/git-cliff && cd git-cliff/

cargo build
samply record target/debug/git-cliff --no-exec -w "$workdir"

rustup target add x86_64-unknown-linux-musl
cargo build --target x86_64-unknown-linux-musl
samply record target/x86_64-unknown-linux-musl/debug/git-cliff --no-exec -w "$workdir"

Then on the browser you can upload profile.json at top right.

[orhun]

Had any chance to try out the profiler?

[inglor]

I did but showed nothing obvious. If the flamegraph seems the same I'm thinking it has to do with the loading of shared libs before the execution of the program itself. The environment it's running on is in AWS Linux 2 (with an old glibc version that's why I'm using musl) and has some 'enterprise' daemons running so I'm assuming it's scanning everything before it tries to execute them? Speculation from my side.

[orhun]

Yeah, that might be the case. Can you share some execution times? I'm just curious about how slow it is.

Also there is this blog post from 2020 FWIW: https://andygrove.io/2020/05/why-musl-extremely-slow/