bug#41702: `guix environment` performance issues

[Lars-Dominik Braun]

Hi Ludo,

> The patch below is a noticeable improvement for me.  On my laptop,
> 
>   GUIX_DAEMON_SOCKET=ssh://localhost ./pre-inst-env guix build libreoffice -n 
> 
> goes from 5.8s to 3.3s.  It just does the same thing as we do for
> guix://.
> 
> Could you check what results it gives you?
looking pretty good, comparing master without/with patch:

---snip---
    N           Min           Max        Median           Avg        Stddev
x  10         16.87         20.77         17.44        17.802     1.1228515
+  10          9.92         13.67         10.19        10.569     1.1254574
Difference at 99.0% confidence
        -7.233 +/- 1.44688
        -40.6303% +/- 6.68735%
---snap---

> There’s a project to rewrite the daemon in Scheme, started by Caleb
> Ristvedt (reepa) as part of GSoC a few years ago.  This could be an
> opportunity to add a new version of the protocol that would support
> pipelining.
Given how much improvement you’ve achieved so far I’d say we can (for now)
probably get away with the current protocol. Still, what’s the status of this
daemon?

Lars

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