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Improving CI throughput

From: Ludovic Courtès
Subject: Improving CI throughput
Date: Mon, 24 Aug 2020 16:42:19 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux)


Mathieu Othacehe <> skribis:

> The current situation is that due to Cuirass/offloading issues such as
> [1], our build farm is most of the time idle. Given our computation
> power, we should be able to bake much more substitutes I think.
> Maybe we could also take advantage of the build-coordinator Christopher
> is implementing (+ Guix daemon RPC's over HTTP) to make sure that we are
> able to deal with a distributed build farm efficiently.
> Now the question I'm asking myself is: could the ARM substitutes
> situation be solved by improving our CI software stack, or do we really
> need more hardware?

Yeah, this is a ridiculous situation.  We should do a hackathon to get
better monitoring of useful metrics (machine load,
time-of-push-to-time-to-build-completion, etc.), to clearly identify the
bottlenecks (crashes? inefficient protocol? scheduling issues? Cuirass
or offload or guix-daemon issue?), and to address as many of them as we

Any volunteers?  :-)


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