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* bug#44254: Performance of package input rewriting
@ 2020-10-27 13:26 Lars-Dominik Braun
  2020-10-27 14:14 ` zimoun
  2020-10-27 19:58 ` Ricardo Wurmus
  0 siblings, 2 replies; 8+ messages in thread
From: Lars-Dominik Braun @ 2020-10-27 13:26 UTC (permalink / raw)
  To: 44254

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Hi,

this issue is similar to https://issues.guix.gnu.org/41702, but I’m not sure
it’s exactly the same. For guix-science I’m trying to provide some packages
like python-jupyterlab, which depend on a mix of packages from guix proper and
newer versions of packages already included in guix proper. Thus I need to
rewrite inputs of the former to the latter. (Because Python only propagates
dependencies and thus collisions would occur.)

Previously I have been doing this using package-input-rewriting, but starting
an environment containing python-jupyterlab alone took about 20s (warm caches,
all derivations in the store). Manually rewriting inputs by inheriting and
alist-delete’ing brings this down to 3s, which is pretty significant.
--no-grafts has not much of an impact (15s vs 2s) here. See
https://github.com/guix-science/guix-science/commit/972795a23cc9eb5a0bb1a2ffb5681d151fc4d4b0
for the exact changes.

My expectation would be that package-input-rewriting is the preferred, because
easier, solution to this problem and thus should have minimal impact on
performance.

Cheers,
Lars


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^ permalink raw reply	[flat|nested] 8+ messages in thread

end of thread, other threads:[~2020-11-03  9:33 UTC | newest]

Thread overview: 8+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2020-10-27 13:26 bug#44254: Performance of package input rewriting Lars-Dominik Braun
2020-10-27 14:14 ` zimoun
2020-10-28 14:19   ` Ludovic Courtès
2020-10-27 19:58 ` Ricardo Wurmus
2020-10-30  8:42   ` Lars-Dominik Braun
2020-10-31 10:27     ` Ludovic Courtès
2020-11-03  8:23       ` Lars-Dominik Braun
2020-11-03  9:32         ` Ludovic Courtès

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