go build at most 37x slower in 1.21.5 vs 1.19.3

[Lib Martinito]

It's 37x slower on go 1.21.5 to build the first time. Do anyone of you know why that is? Should I raise a bug instead?

What I compiled was only a simple "hello world!" using println. The environments are docker images - go-1.19:alpine and go-1.21:alpine respectively.

It would be appreciated if anyone could shed some light around this. 

[TheDiveO]

IIRC the stdlib isn't delivered precompiled anymore since 1.20. You should make sure to have layer caching in place in case you want to tune your pipelines. You can do a "go build std" IIRC.

[Steven Hartland]

If I recall correctly 1.21 stopped shipping precompiled libs so would need to compile all the standard libs which previously it didnt have to do.

Can anyone confirm?

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[Def Ceb]

The Go blog does indeed say this.
> The go tool no longer relies on pre-compiled standard library package
archives in the $GOROOT/pkg directory, and they are no longer shipped
with the distribution, resulting in smaller downloads. Instead, packages
in the standard library are built as needed and cached in the build
cache, like other packages.

https://go.dev/blog/go1.20

Steven Hartland:

> If I recall correctly 1.21 stopped shipping precompiled libs so would
> need to compile all the standard libs which previously it didnt have to do.
>
> Can anyone confirm?
>
> On Wed, 13 Dec 2023 at 15:40, Lib Martinito <l...@codecrafters.io

> <mailto:l...@codecrafters.io>> wrote:
>
>
> Screenshot 2023-12-13 at 8.05.38 PM.pngScreenshot 2023-12-13 at

> 8.13.47 PM.png
>
> It's 37x slower on go 1.21.5 to build the first time. Do anyone of
> you know why that is? Should I raise a bug instead?
>
> What I compiled was only a simple "hello world!" using println. The
> environments are docker images - go-1.19:alpine and go-1.21:alpine
> respectively.
>
> It would be appreciated if anyone could shed some light around this.
>
> --
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