du: our implementation is slower than GNU's #6845
Description
On firefox source code (lot of files and directories):
# with 0.0.17:
$ hyperfine "/usr/bin/du " "/usr/lib/cargo/bin/coreutils/du"
Benchmark 1: /usr/bin/du
Time (mean ± σ): 3.804 s ± 0.051 s [User: 1.174 s, System: 2.606 s]
Range (min … max): 3.722 s … 3.884 s 10 runs
Benchmark 2: /usr/lib/cargo/bin/coreutils/du
Time (mean ± σ): 4.822 s ± 0.056 s [User: 1.608 s, System: 3.190 s]
Range (min … max): 4.754 s … 4.921 s 10 runs
Summary
'/usr/bin/du ' ran
1.27 ± 0.02 times faster than '/usr/lib/cargo/bin/coreutils/du '
seems that we regressed:
# with 0.0.26:
hyperfine "/usr/bin/du " "/usr/lib/cargo/bin/coreutils/du "
Benchmark 1: /usr/bin/du
Time (mean ± σ): 3.980 s ± 0.075 s [User: 1.181 s, System: 2.772 s]
Range (min … max): 3.887 s … 4.087 s 10 runs
Benchmark 2: /usr/lib/cargo/bin/coreutils/du
Time (mean ± σ): 6.947 s ± 0.096 s [User: 2.533 s, System: 5.479 s]
Range (min … max): 6.800 s … 7.104 s 10 runs
Summary
'/usr/bin/du ' ran
1.75 ± 0.04 times faster than '/usr/lib/cargo/bin/coreutils/du '