Hi Luis, Luis Felipe <luis.felipe...@protonmail.com> skribis:
>> Could you time just profile generation itself? >> > >> To do that, you need to find the profile generation and then to rebuild >> it, along these lines: >> > >> DRV=$(guix gc --derivers $(readlink -f ~/.guix-profile)) >> time guix build --check $DRV > > The above results in > > real 1m28,841s > user 0m2,169s > sys 0m0,450s Thanks. It means that profile generation itself (and not just hooks) is slow. The place to look at is (guix build union). Unfortunately, I suspect there’s little room for optimization at this stage (see commit 12129998689648923b58c426362a1bc875da75f9 from… 2014). Fundamentally, ‘union-build’ traverses every input directory, which is expensive with low-end hard disks. It would still be worth investigating (for example by strace’ing the ‘union-build’ process) in case we missed optimizationm opportunities, though. Thanks, Ludo’.
