Nix eval cache benchmark

flake.lock

{                                                                                                 
  "nodes": {                                                                                      
    "flake-utils": {                                                                              
      "locked": {                                                                                         
        "lastModified": 1644229661,                                                        
        "narHash": "sha256-1YdnJAsNy69bpcjuoKdOYQX0YxZBiCYZo4Twxerqv7k=",                                           
        "owner": "numtide",                                                                                         
        "repo": "flake-utils",                                                             
        "rev": "3cecb5b042f7f209c56ffd8371b2711a290ec797",                                                                     
        "type": "github"                                                                                                       
      },                                                                                                                       
      "original": {                                                                                                                          
        "owner": "numtide",                                                                                                                  
        "repo": "flake-utils",               
        "type": "github"                             
      }                                                                                                                                                        
    },                                                                                                                                                         
    "nixpkgs": {                                                                                                                                               
      "locked": {                                                                          
        "lastModified": 1641528457,                                                        
        "narHash": "sha256-FyU9E63n1W7Ql4pMnhW2/rO9OftWZ37pLppn/c1aisY=",                         
        "path": "/nix/store/pwz0d92vl5hjrvhiri3qzazxjnf1r8wy-source",                             
        "rev": "ff377a78794d412a35245e05428c8f95fef3951f",                                                
        "type": "path"                               
      },                                                                                                            
      "original": {                                       
        "id": "nixpkgs",                                                                                            
        "type": "indirect"                                
      }                                                                                                                        
    },                                                                                                                         
    "root": {                                                  
      "inputs": {                                                                                                                            
        "flake-utils": "flake-utils",                                 
        "nixpkgs": "nixpkgs"            
      }                                
    }                                  
  },                                                                                                                                                           
  "root": "root",                                                              
  "version": 7                                                                                                                                                 
}        

flake.nix

{
  description = "A basic flake with a shell";
  inputs.flake-utils.url = "github:numtide/flake-utils";

  outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system: let
      pkgs = nixpkgs.legacyPackages.${system};
    in {
      devShell = pkgs.mkShell {
        nativeBuildInputs = [ pkgs.bashInteractive pkgs.hyperfine ];
        buildInputs = [ ];
      };
    });
}

gistfile1.txt

#!/usr/bin/env bash

set -euo pipefail

rm -rf .direnv
mkdir -p .direnv

hyperfine --warmup 1 \
  "nix print-dev-env --option eval-cache false --profile .direnv/flake-profile-native" \
  "nix print-dev-env --profile .direnv/flake-profile-native" \
  "echo "" >> shell.nix && direnv export zsh" \
  "direnv export zsh" \
  "SHELL=true lorri shell" \
  "SHELL=true lorri shell --cached" \
  --export-markdown bench.md

git checkout flake.nix

shell.nix

(builtins.getFlake (builtins.toPath ./.)).outputs.devShell.${builtins.currentSystem}