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refactor(tvix/eval): persistent, memory-sharing OrdMap for NixAttrs

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This uses the `im::OrdMap` for `NixAttrs` to enable sharing of memory
between different iterations of a map.

This slightly speeds up eval, but not significantly. Future work might
include benchmarking whether using a `HashMap` and only ordering in
cases where order is actually required would help.

This switches to a fork of `im` that fixes some bugs with its OrdMap
implementation.

Change-Id: I2f6a5ff471b6d508c1e8a98b13f889f49c0d9537
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7676
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
This commit is contained in:
Vincent Ambo 2022-12-29 17:08:14 +03:00 • committed by tazjin
parent 610c44ec1e
commit 91465dc78e
10 changed files with 144 additions and 172 deletions
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43
corp/tvixbolt/Cargo.lock generated
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@ -36,12 +36,9 @@ checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
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@ -570,16 +575,6 @@ dependencies = [
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