Re: Performance of computing cross derivations

[Ludovic Courtès]

Hi,

Christopher Baines <mail@cbaines.net> skribis:

> I think you're right, while I send some other changes in #68266, I think
> it's this change around make-rust-sysroot that has pretty much all the
> effects on performance.
>
> I think the tens of thousands of duplicated packages from cross-base
> that I was looking at are almost entirely coming from
> make-rust-sysroot. As Ludo mentions in [1], maybe this has something to
> do with use of cross- procedures in native-inputs, although I'm not sure
> that moving those calls out of native-inputs is a correct thing to do.
>
> I don't know what the correct approach here is, but I think something
> needs doing here to address the performance regression.

I probably missed it in the thread: what commit caused the regression,
and how can I test any changes?  I’m willing to help but I missed some
of the context.

Thanks,
Ludo’.