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authorVincent Ambo <mail@tazj.in>2022-12-29T11·44+0300
committertazjin <tazjin@tvl.su>2022-12-29T12·27+0000
commit5d73c06b1a67bce68dcc0b2bd5f087ce00ab6317 (patch)
tree62d40c8ca8e1620bff028c8d89a5a0f05ee00661 /README.md
parent6ab8320f075e36f2328a86f5fcf7674844a0bd12 (diff)
refactor(tvix/eval): use im::Vector for NixList representation r/5534
This is a persistent, structurally sharing data structure which is
more efficient in some of our use-cases. I have verified the
efficiency improvement using `hyperfine` repeatedly over expressions
on nixpkgs.

Lists are not the most performance-critical structure in Nix (that
would be attribute sets), but we can already see a small (~5-10%)
improvement.

Note that there are a handful of cases where we still go via `Vec`
that need to be fixed, most notable for `builtins.sort` which can not
currently be implemented directly using `im::Vector` because of a
restrictive type bound.

Change-Id: I237cc50cbd7629a046e5a5e4601fbb40355e551d
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7670
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>
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