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author | Vincent Ambo <mail@tazj.in> | 2023-02-03T09·25+0300 |
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committer | tazjin <tazjin@tvl.su> | 2023-02-03T18·47+0000 |
commit | f16b0f24e2f7c360b1daf7ae7b8e3341907faf76 (patch) | |
tree | 831f17857e1e1b1eb64a5d91552a0899184cafaf /corp/website/content-en.md | |
parent | 32698766ef05c1c5f65a2fdbb8d08c558d793dec (diff) |
refactor(tvix/eval): wrap `Builtin` type in a Box r/5832
This reduces the size of `Builtin` from 88 (!) bytes to 8, and as the largest variant of `Value`, the size of that type from 96 to 64. The next largest type is NixList, clocking in at 64 bytes. This has noticeable performance impact. In an implementation without disk I/O, evaluating nixpkgs.stdenv looks like this: Benchmark 1: tvix -E '(import <nixpkgs> {}).stdenv.drvPath' Time (mean ± σ): 1.151 s ± 0.003 s [User: 1.041 s, System: 0.109 s] Range (min … max): 1.147 s … 1.155 s 10 runs After this change, it looks like this: Benchmark 1: tvix -E '(import <nixpkgs> {}).stdenv.drvPath' Time (mean ± σ): 1.046 s ± 0.004 s [User: 0.954 s, System: 0.092 s] Range (min … max): 1.041 s … 1.053 s 10 runs Change-Id: I5ab7cc02a9a450c0227daf1f1f72966358311ebb Reviewed-on: https://cl.tvl.fyi/c/depot/+/8027 Tested-by: BuildkiteCI Reviewed-by: flokli <flokli@flokli.de>
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