On Mon, 2023-07-31 at 12:49 +0200, Florian Schmaus wrote: > On 31/07/2023 11.32, Sam James wrote: > > > > Florian Schmaus <f...@gentoo.org> writes: > > > > > [[PGP Signed Part:Undecided]] > > > On 31/07/2023 07.02, Michał Górny wrote: > > > > On Sun, 2023-07-30 at 22:19 +0200, Florian Schmaus wrote: > > > > > Which problem are we solving by moving away from this towards a > > > > > slightly > > > > > more verbose construct? > > > > The problem was that cargo.eclass ebuilds were taking significant > > > > time > > > > during cache regeneration and slowing down tools noticeably. No fancy > > > > loops required, contrary to your great theory. > > > > > > Removing the $()/fork from go-modules.eclass reduced the source time > > > of a package from 2400 milliseconds to 236 milliseconds. > > > > > > Changing, for example net-p2p/arti-1.1.6, to use _cargo_set_crate_uris > > > reduces the source time from 44 milliseconds to 24 milliseconds. > > > > > > That is a win in relative reduction, but absolute its just 20 > > > milliseconds. Cache regeneration is an embarrassingly parallel > > > problem. Therefore such a reduction should not matter much, assuming > > > you have some parallelism on the hardware level. > > > > Consistency matters > > Sure, I would be in favor of consistently using $(foo_uris). > > Especially since the performance gains of the variable-setting approach > are even lower than I first assumed. The cargo.eclass runs the function > that computes CARGO_CRATE_URIS now twice, which adds significantly more > overhead than the fork of $(foo_uris). See my patch to the ML. >
So, to summarize, your point is that after you've ignored the original thread and we've actually started switching stuff to ${xxx}, we should reopen the discussion and start moving everything back to $(xxx), even though you've proven yourself that it's less optimal ("but only a little!") and because... you prefer it? Yes, that certainly makes sense. It's surely a great way to run a distro is to undo optimizations 6 weeks later because you liked the old variant better. -- Best regards, Michał Górny