Hi, Joshua Branson <jbra...@dismail.de> skribis:
> I don't want to complain (because I'm probably not going to be able to > fix any issues that I spot), but it does seem to take a while for me to > install packages, at least the XDG mime step. It's not a huge issue for > me. I just realize that installing packages takes more time . :) But > if we are calling this an "issue", your suggestion to use numerous > packages seems like a "work-around" rather than a "fix". Just having identified which part is low is already a step forward. :-) I hadn’t noticed, but indeed the “XDG MIME database” steps takes a while. For my “big” user profile, on an SSD, it takes more than 4s: --8<---------------cut here---------------start------------->8--- $ time guix build --check $(guix gc -R $(guix gc --derivers $(readlink -f ~/.guix-profile)) |grep xdg-mime-database.drv) The following profile hook will be built: /gnu/store/dhcv26m2k3kyx92wf9palp8byhblgjrr-xdg-mime-database.drv building XDG MIME database... successfully built /gnu/store/dhcv26m2k3kyx92wf9palp8byhblgjrr-xdg-mime-database.drv /gnu/store/q25yv8hil0281x7zm25l259xvjfwwrsx-xdg-mime-database real 0m4.241s user 0m1.689s sys 0m0.101s $ guix package -I |wc -l 296 --8<---------------cut here---------------end--------------->8--- It’s worse on a cold cache: --8<---------------cut here---------------start------------->8--- $ drv="$(guix gc -R $(guix gc --derivers $(readlink -f ~/.guix-profile)) |grep xdg-mime-database.drv)" $ sudo sh -c 'echo 3 > /proc/sys/vm/drop_caches' $ time guix build --check "$drv" The following profile hook will be built: /gnu/store/dhcv26m2k3kyx92wf9palp8byhblgjrr-xdg-mime-database.drv building XDG MIME database... successfully built /gnu/store/dhcv26m2k3kyx92wf9palp8byhblgjrr-xdg-mime-database.drv /gnu/store/q25yv8hil0281x7zm25l259xvjfwwrsx-xdg-mime-database real 0m5.872s user 0m0.314s sys 0m0.102s --8<---------------cut here---------------end--------------->8--- And it’s probably worse on spinning disks? What timings do you get? We should profile this hook and see if it’s the ‘union-build’ call that’s taking time or the ‘update-mime-database’ invocation. ‘union-build’ tends to be very I/O-intensive. Thanks, Ludo’.