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authorpennae <github@quasiparticle.net>2021-12-20 11:29:14 +0100
committerpennae <github@quasiparticle.net>2022-01-13 18:06:15 +0100
commiteee0bcee227f6a1b46116efc8915545feb5a2e86 (patch)
tree2f1d224f2f827042406e0a719393b67022bd581c /Makefile.config.in
parent61a9d16d5c1d4088981f7d0ca08655f9155cc015 (diff)
avoid allocations in SymbolTable::create
speeds up parsing by ~3%, system builds by a bit more than 1% # before Benchmark 1: nix search --offline nixpkgs hello Time (mean ± σ): 574.7 ms ± 2.8 ms [User: 566.3 ms, System: 8.0 ms] Range (min … max): 569.2 ms … 580.7 ms 50 runs Benchmark 2: nix eval -f ../nixpkgs/pkgs/development/haskell-modules/hackage-packages.nix Time (mean ± σ): 394.4 ms ± 0.8 ms [User: 361.8 ms, System: 32.3 ms] Range (min … max): 392.7 ms … 395.7 ms 50 runs Benchmark 3: nix eval --raw --impure --expr 'with import <nixpkgs/nixos> {}; system' Time (mean ± σ): 2.976 s ± 0.005 s [User: 2.757 s, System: 0.218 s] Range (min … max): 2.966 s … 2.990 s 50 runs # after Benchmark 1: nix search --offline nixpkgs hello Time (mean ± σ): 572.4 ms ± 2.3 ms [User: 563.4 ms, System: 8.6 ms] Range (min … max): 566.9 ms … 579.1 ms 50 runs Benchmark 2: nix eval -f ../nixpkgs/pkgs/development/haskell-modules/hackage-packages.nix Time (mean ± σ): 381.7 ms ± 1.0 ms [User: 348.3 ms, System: 33.1 ms] Range (min … max): 380.2 ms … 387.7 ms 50 runs Benchmark 3: nix eval --raw --impure --expr 'with import <nixpkgs/nixos> {}; system' Time (mean ± σ): 2.936 s ± 0.005 s [User: 2.715 s, System: 0.221 s] Range (min … max): 2.923 s … 2.946 s 50 runs
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