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scripts/update: note some limitations of PARALLELISM

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Colin
2025-05-09 06:30:18 +00:00
parent 17cdca36ca
commit acdf9b7f94
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scripts/update
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@@ -2,6 +2,13 @@
#!nix-shell -i bash -p findutils -p git -p nix-update #!nix-shell -i bash -p findutils -p git -p nix-update
# each update job has to do an entire nix eval, which can be memory intensive; be careful when tuning this # each update job has to do an entire nix eval, which can be memory intensive; be careful when tuning this
# N.B.: not all update jobs are actually independent! naive parallelism like this *will* result in
# failed/partial updates, e.g.:
# 1. `sane.nixpkgs-bootstrap.master` is being updated: this breaks eval of _all_ other attributes.
# 2. `sane.otherPackage` is being updated: its updateScript fails to eval `sane.otherPackage.src`,
# however this would eval if job 1 and 2 were serialized.
#
# TODO: perform parallel updates in some way that the update scripts don't interfere with eachother.
PARALLELISM=8 PARALLELISM=8
SELF_PATH=$PWD/$0 SELF_PATH=$PWD/$0