ludo@gnu.org (Ludovic Courtès) writes:

> Hello Guix!
>
> With commit 183445a6ed1cbac929ecb65303246945c8ccf39d, ‘guix weather’ can
> now report continuous integration (CI) stats using the Hydra/Cuirass
> HTTP interface:
>
> $ ./pre-inst-env guix weather --substitute-urls='https://berlin.guixsd.org https://hydra.gnu.org' -m ~/src/configuration/user-profile.scm
> computing 352 package derivations for x86_64-linux...
> looking for 421 store items on https://berlin.guixsd.org...
> https://berlin.guixsd.org
>   76.7% substitutes available (323 out of 421)
>   753.4 MiB of nars (compressed)
>   1,805.7 MiB on disk (uncompressed)
>   0.000 seconds per request (0.2 seconds in total)
>   2,740.3 requests per second
>
>   0.0% (0 out of 98) of the missing items are queued
>   965 queued builds
>       aarch64-linux: 965 (100.0%)
>   build rate: 23.41 builds per hour
>       x86_64-linux: 11.16 builds per hour
>       i686-linux: 6.03 builds per hour
>       aarch64-linux: 6.41 builds per hour
> looking for 421 store items on https://hydra.gnu.org...
> https://hydra.gnu.org
>   96.7% substitutes available (407 out of 421)
>   1,296.8 MiB of nars (compressed)
>   3,158.4 MiB on disk (uncompressed)
>   0.001 seconds per request (0.5 seconds in total)
>   808.5 requests per second
>
>   867 queued builds
>       x86_64-linux: 518 (59.7%)
>       i686-linux: 221 (25.5%)
>       armhf-linux: 128 (14.8%)
>   build rate: 20.93 builds per hour
>       i686-linux: 9.23 builds per hour
>       armhf-linux: 8.75 builds per hour
>       x86_64-linux: 2.95 builds per hour
>
> In a way, this adds a forecasting capability to ‘guix weather’.

That is very cool!  It seems immediately useful for measuring the
performance of a build farm.

This shows us just a single snapshot in time.  It would be interesting
to have historical data, as well.  If Hydra or Cuirass logged metrics
(sometimes referred to as "telemetry" data) as it ran, it could be
useful for operating build farms and measuring improvements in their
performance.  There are a lot of great tools out there for analyzing
metrics / telemetry data, including fancy dashboarding software (e.g.,
Kibana and Grafana come to mind).  Does Guile have any existing
libraries for logging metrics in some kind of structured format that is
amenable to ad-hoc analysis or to ingestion into dashboarding software?

-- 
Chris