On Sat, Aug 23, 2025 at 5:09 PM Cyrill Troxler <cyrilltrox...@gmail.com> wrote:
>
> I noticed that simply importing certain modules can substantially increase
> observed RSS even though nothing is visibly being allocated on the heap when
> looking at pprof. For example, take the following program:
>
> ```
> package main
>
> import (
> "time"
> )
>
> func main() {
> time.Sleep(time.Hour)
> }
> ```
>
> Running this with go 1.24.6 and running it shows an RSS of 1688 KB (using ps).
>
> ```
> VSZ RSS
> 1225172 1688
> ```
>
> Now as an example, I just add the following import: `_
> "google.golang.org/grpc"`
>
> The RSS of the otherwise same program looks like this:
>
> ```
> VSZ RSS
> 1646164 9896
> ```
>
> First off, what exactly is causing this rather big increase in RSS here? Is
> there any way to reduce this and if not, what is the best way to find such
> heavy dependencies?
>
> I have used https://github.com/Zxilly/go-size-analyzer with some success but
> this just looks at the binary size and is not very granular, e.g. I have no
> way of knowing what exactly inside of the grpc module is causing this.
I didn't double check, but this could be a version of
https://go.dev/issue/62024.
Ian
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