Hi! Ludovic Courtès <l...@gnu.org> skribis:
> but on ‘wip-build-systems-gexp’ I get: > > $ GUIX_PROFILING=gc time ./pre-inst-env guix build qemu -d --no-grafts > /gnu/store/5n44l8cmrmkr747nsqbxpm4764jdsl3l-qemu-5.1.0.drv > Garbage collection statistics: > heap size: 80.52 MiB > allocated: 249.89 MiB > GC times: 16 > time spent in GC: 0.75 seconds (34% of user time) > 2.22user 0.13system 0:02.06elapsed 114%CPU (0avgtext+0avgdata > 243532maxresident)k > 0inputs+0outputs (0major+34304minor)pagefaults 0swaps > > In short, 30% more garbage allocated and an 8% slowdown. In the meantime, librsvg on core-updates switched to the version that depends on Rust. As a result, the above command, on core-updates, went to ~2.25s on my laptop (+10–20%!). Would be nice to investigate. One issue is that ‘cargo-build-system’ traverses packages. The ‘crate-closure’ call in there certainly adds a fair bit of overhead. Could we avoid it? Thanks, Ludo’.
