Christopher Baines @cbaines@octodon.social

Coping with network related issues and not giving up were design principles of the Guix Build Coordinator, I think they're quite important!

One of the #Guix Build Coordinator agents behind bordeaux.guix.gnu.org tried for ~4 months to build a texlive related derivation before finally succeeding today!

https://data.guix.gnu.org/build-server/2/build?build_server_build_id=33823ed3-26e2-4d63-bca6-81d2efd188fb

The problem was uploading the ~2.7GB output. I think the recent support for resuming partial uploads is what finally made it possible to successfully get the output back to the coordinator.

Over a year ago, the Guix Build Coordinator was building lots of things for substitutes https://octodon.social/@cbaines/104297876310550244

It's taken a while, but now it should be benefiting general users of #guix

New #guix blog post! https://guix.gnu.org/en/blog/2021/substitutes-now-also-available-from-bordeauxguixgnuorg/

I do hate it when the GNU Shepherd kills services that are starting, but haven't started...

I'm not sure how this helps, most of the time I'm watching the logs for a long while before I realise the Shepherd has done the opposite of starting the service.

I thought I was having a good day with computers, but after upgrading a #Guix system, I now can't login through the GDM, and hours of debugging has left me none the wiser.

Something is broken, and it seems there's very little to help work out what.

Reinstalling the OS shouldn't be necessary to fix this kind of issue, but that's what I might have to do...

I forget exactly when I had a proof of concept for using the Guix Build Coordinator to build things for substitutes.

It seems like I had a working setup for x86-64-linux around a year ago (a year ago exactly in ~3 weeks).

Real world events are getting in the way of my concentration, it probably doesn't help that I studied the conflicts involving #Israel in school.

There's so much to the conflict though, I think I only learned recently of the engagement involving the USS Liberty https://en.wikipedia.org/wiki/USS_Liberty_incident an attack by the Israeli air force and navy on a US intelligence ship.

This is an account of the attack by a survivor https://www.youtube.com/watch?v=eUU08xnVaGM

I did another round of Guix Build Coordinator database improvements, and the results are pretty good.

The graph here shows the 95th percentile time for a few database operations. The blue one (allocating builds to agents) has gone from taking up to a second most of the time to barely registering (5ms or less).

I think fitting in WAL checkpoints between allocations, prompting SQLite to "optimize" and not caching query plans forever are the main changes which helped bring this about.

I've had this hardware (i5-2500k with a capable cooler) for ages now, and I haven't been using it for many years.

It still works though, and I've managed to overclock the processor to 5Ghz.

I haven't got around to measuring the single core performance, though at some point I want to see how it compares to my i7-8700K.

I never thought a saw would be important when plugging in this connector, but it now fits, so I'm pretty happy!

armhf-linux builds are now happening at pace for https://guix.cbaines.net/ 🎉

There were some problematic derivations, and I had to unblock those manually. There could have been some Guix Build Coordinator bugs involved too though.

I'm excited to see how well this works, mixing native aarch64 hardware and QEMU emulation for aarch64-linux seems to have worked well. For armhf-linux, I'm using a mixture of compatible aarch64 hardware and QEMU on x86_64.

#guix

#Guix Build Coordinator progress, I made some database schema changes, and the size of the guix.cbaines.net database dropped from ~43GB to ~11.5GB!

When I started writing it, I used natural keys, UUID's for the builds, and /gnu/store/... names to identify derivations. This was fine at small scale, but with lots of builds and derivations, it made for a much bigger database, and slower queries.

This morning on actual things #Guile expects you to read:

```
WARNING: WARNING: (guix-build-coordinator coordinator): imp(guix-build-coordinator datastore sqlite)orte::d imopdurlee d module (fibers) overrides core booivndrinig e`s core binding `'
```

Cross distro collaboration is great! https://github.com/boto/s3transfer/pull/164