Re: Image generation

[Ludovic Courtès]

Mathieu Othacehe <address@hidden> skribis:

>> Wow! Why did it take 2h30? Do you have KVM?
>
> Yes, I'm not sure why it's so long. It seems that
> "estimated-partition-size" takes a large proportion of this time,
> because if I run the same command with a fixed disk-image size it goes
> faster.

Ooooh, I had never realized, but you may be right: ‘closure-size’ stats
every single file of the closure, and those files are accessed over 9P.

That said, I tried this:

--8<---------------cut here---------------start------------->8---
$ guix system build gnu/system/examples/bare-bones.tmpl --no-offload

[...]

$ time guix system disk-image gnu/system/examples/bare-bones.tmpl --no-offload
guix system: warning: Your Guix installation is 15 days old.
guix system: warning: Consider running 'guix pull' followed by
'guix system reconfigure' to get up-to-date packages and security updates.

La jenaj derivoj estos konstruataj:
   /gnu/store/ydvfhx9v65l4cjrbdgr6xxdh44091fwf-disk-image.drv
   /gnu/store/8kz750zdbxl86n4w2gfcm0xm6gcqzbnb-linux-vm-loader.drv
   /gnu/store/0jmcc2f6r3q72mlbi9ahmx2bjghn2rha-builder-in-linux-vm.drv
   /gnu/store/9df7312w32sbs9nv55x8arh2c65apjmx-grub.cfg.drv
   /gnu/store/72mmpjd65ysyxdb8c7x9bflb7g9jq93i-raw-initrd.drv
   /gnu/store/m4xri89s0m0xkdkbma1z0a9ikaz3117v-system.drv
   /gnu/store/53gm95vhr2p5r6g3bb7c7zynchwn2k3x-boot.drv
   /gnu/store/ylmkdd43vinyz6li8kx62cphz74kcark-parameters.drv
building /gnu/store/53gm95vhr2p5r6g3bb7c7zynchwn2k3x-boot.drv...
building /gnu/store/72mmpjd65ysyxdb8c7x9bflb7g9jq93i-raw-initrd.drv...
building /gnu/store/ylmkdd43vinyz6li8kx62cphz74kcark-parameters.drv...
building /gnu/store/m4xri89s0m0xkdkbma1z0a9ikaz3117v-system.drv...
building /gnu/store/9df7312w32sbs9nv55x8arh2c65apjmx-grub.cfg.drv...
building /gnu/store/0jmcc2f6r3q72mlbi9ahmx2bjghn2rha-builder-in-linux-vm.drv...
building /gnu/store/8kz750zdbxl86n4w2gfcm0xm6gcqzbnb-linux-vm-loader.drv...
building /gnu/store/ydvfhx9v65l4cjrbdgr6xxdh44091fwf-disk-image.drv...
/gnu/store/7v599g2zwkzb6lv8s6gjm66lqw0gcb53-disk-image

real    4m11.079s
user    0m5.145s
sys     0m0.418s
$ guix describe
Generacio 139   Apr 13 2020 21:50:08    (nuna)
  guix bad368b
    repository URL: https://git.savannah.gnu.org/git/guix.git
    branch: master
    commit: bad368b0d794689f3a8a11b58f1ea4987938682e
--8<---------------cut here---------------end--------------->8---

So it’s much less than 2h30.  Could it be that you timing building of
additional derivations?  Even with a cold cache, it shouldn’t make that
big a difference no?

Thanks,
Ludo’.