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malloc/memset even less

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more buffers that can be uninitialized and on the stack. small
difference, but still worth doing.

before:

Benchmark 1: nix eval --raw --impure --expr 'with import <nixpkgs/nixos> {}; system'
  Time (mean ± σ):      6.963 s ±  0.011 s    [User: 5.330 s, System: 1.421 s]
  Range (min … max):    6.943 s …  6.974 s    10 runs

after:

Benchmark 1: nix eval --raw --impure --expr 'with import <nixpkgs/nixos> {}; system'
  Time (mean ± σ):      6.952 s ±  0.015 s    [User: 5.294 s, System: 1.452 s]
  Range (min … max):    6.926 s …  6.974 s    10 runs
This commit is contained in:
pennae 2023-12-26 17:40:55 +01:00
parent 99a691c8a1
commit 2cfc4ace35
3 changed files with 3 additions and 3 deletions
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2
src/libutil/file-system.cc
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@ -307,7 +307,7 @@ void writeFile(const Path & path, Source & source, mode_t mode, bool sync)
if (!fd)
throw SysError("opening file '%1%'", path);
std::vector<char> buf(64 * 1024);
std::array<char, 64 * 1024> buf;
try {
while (true) {