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# Benchmarking scripts for Lix
These are very much WIP, and have a few clumsy assumptions that we would
somewhat rather be fixed, but we have committed them to let others be able to
do benchmarking in the mean time.
## Benchmarking procedure
Build some Lixes you want to compare, by whichever means you wish.
Get a computer that is not busy and *strongly preferably* is bare-metal or at
least not a cloud VM (e.g. go make coffee when running benchmarks).
From the root of a Lix checkout, run `./bench/bench.sh resultlink-one
resultlink-two`, where `resultlink-one` and `resultlink-two` are the result
links from the builds you want to test (they can be any directory with bin/nix
in it, however).
To get the summary again, run `./bench/summarize.jq bench/bench-*.json`.
## Example results
(vim tip: `:r !bench/summarize.jq bench/bench-*.json` to dump it directly into
your editor)
```
result-asserts/bin/nix --extra-experimental-features 'nix-command flakes' search --no-eval-cache github:nixos/nixpkgs/e1fa12d4f6
c6fe19ccb59cac54b5b3f25e160870 hello
mean: 15.993s ± 0.081s
user: 13.321s | system: 1.865s
median: 15.994s
range: 15.829s ... 16.096s
relative: 1
result/bin/nix --extra-experimental-features 'nix-command flakes' search --no-eval-cache github:nixos/nixpkgs/e1fa12d4f6c6fe19cc
b59cac54b5b3f25e160870 hello
mean: 15.897s ± 0.075s
user: 13.248s | system: 1.843s
median: 15.88s
range: 15.807s ... 16.047s
relative: 0.994
---
result/bin/nix --extra-experimental-features 'nix-command flakes' eval -f bench/nixpkgs/pkgs/development/haskell-modules/hackage-packages.nix
mean: 0.4s ± 0.024s
user: 0.335s | system: 0.046s
median: 0.386s
range: 0.379s ... 0.43s
relative: 1
result-asserts/bin/nix --extra-experimental-features 'nix-command flakes' eval -f bench/nixpkgs/pkgs/development/haskell-modules/hackage-packages.nix
mean: 0.404s ± 0.024s
user: 0.338s | system: 0.046s
median: 0.386s
range: 0.384s ... 0.436s
relative: 1.008
---
result-asserts/bin/nix --extra-experimental-features 'nix-command flakes' eval --raw --impure --expr 'with import <nixpkgs/nixos> {}; system'
mean: 5.838s ± 0.023s
user: 5.083s | system: 0.464s
median: 5.845s
range: 5.799s ... 5.867s
relative: 1
result/bin/nix --extra-experimental-features 'nix-command flakes' eval --raw --impure --expr 'with import <nixpkgs/nixos> {}; system'
mean: 5.788s ± 0.044s
user: 5.056s | system: 0.439s
median: 5.79s
range: 5.715s ... 5.876s
relative: 0.991
---
GC_INITIAL_HEAP_SIZE=10g result-asserts/bin/nix eval --extra-experimental-features 'nix-command flakes' --raw --impure --expr 'with import <nixpkgs/nixos> {}; system'
mean: 4.147s ± 0.021s
user: 3.457s | system: 0.487s
median: 4.147s
range: 4.123s ... 4.195s
relative: 1
GC_INITIAL_HEAP_SIZE=10g result/bin/nix eval --extra-experimental-features 'nix-command flakes' --raw --impure --expr 'with import <nixpkgs/nixos> {}; system'
mean: 4.149s ± 0.027s
user: 3.483s | system: 0.456s
median: 4.142s
range: 4.126s ... 4.215s
relative: 1
---
```
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