Hullo Pierre! Pierre Neidhardt 写道：
Is there any plan to support parallel downloads?
Guix already downloads sources and substitutes in parallel with other builds/downloads through the --max-jobs option.
You could add a separate knob for downloads that defaults to --max-jobs. Or even (* max-jobs cores). No plans for that AFAIK. I don't think it's a trivial tweak.
I'm interested in the numbers behind this claim:
Currently downloads are a bottleneck for `guix install / upgrade`, parallel downloads could reduce the operation duration by an orderof magnitude.
…because on a substitute-only workload, my default --max-jobs=4 connections give me 4 MiB/s versus 1.5 MiB/s on a single job.
That's not even a linear increase, let alone an order of magnitude (base 2 doesn't count :-).
Kind regards, T G-R
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