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base repository: NixOS/nix
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head repository: NixOS/nix
compare: 75db069f927f
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  • 3 commits
  • 5 files changed
  • 1 contributor

Commits on Mar 4, 2020

  1. Add test for foldl'

    @edolstra
    edolstra committed Mar 4, 2020
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  2. builtins.cache: Cache regular expressions 

    The evaluator was spending about 1% of its time compiling a small
number of regexes over and over again.
    @edolstra
    edolstra committed Mar 4, 2020
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  3. Optimise Derivation::unparse() 

    In

  nix-instantiate --dry-run '<nixpkgs/nixos/release-combined.nix>' -A nixos.tests.simple.x86_64-linux

this reduces time spent in unparse() from 9.15% to 4.31%. The main
culprit was appending characters one at a time to the destination
string. Even though the string has enough capacity, push_back() still
needs to check this on every call.
    @edolstra
    edolstra committed Mar 4, 2020
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