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use core::hint::black_box;
use std::collections::{BTreeSet, HashSet};
use std::hash::{DefaultHasher, Hash, Hasher};
use std::path::*;
#[bench]
#[cfg_attr(miri, ignore)] // Miri isn't fast...
fn bench_path_cmp_fast_path_buf_sort(b: &mut test::Bencher) {
let prefix = "my/home";
let mut paths: Vec<_> =
(0..1000).map(|num| PathBuf::from(prefix).join(format!("file {num}.rs"))).collect();
paths.sort();
b.iter(|| {
black_box(paths.as_mut_slice()).sort_unstable();
});
}
#[bench]
#[cfg_attr(miri, ignore)] // Miri isn't fast...
fn bench_path_cmp_fast_path_long(b: &mut test::Bencher) {
let prefix = "/my/home/is/my/castle/and/my/castle/has/a/rusty/workbench/";
let paths: Vec<_> =
(0..1000).map(|num| PathBuf::from(prefix).join(format!("file {num}.rs"))).collect();
let mut set = BTreeSet::new();
paths.iter().for_each(|p| {
set.insert(p.as_path());
});
b.iter(|| {
set.remove(paths[500].as_path());
set.insert(paths[500].as_path());
});
}
#[bench]
#[cfg_attr(miri, ignore)] // Miri isn't fast...
fn bench_path_cmp_fast_path_short(b: &mut test::Bencher) {
let prefix = "my/home";
let paths: Vec<_> =
(0..1000).map(|num| PathBuf::from(prefix).join(format!("file {num}.rs"))).collect();
let mut set = BTreeSet::new();
paths.iter().for_each(|p| {
set.insert(p.as_path());
});
b.iter(|| {
set.remove(paths[500].as_path());
set.insert(paths[500].as_path());
});
}
#[bench]
#[cfg_attr(miri, ignore)] // Miri isn't fast...
fn bench_path_hashset(b: &mut test::Bencher) {
let prefix = "/my/home/is/my/castle/and/my/castle/has/a/rusty/workbench/";
let paths: Vec<_> =
(0..1000).map(|num| PathBuf::from(prefix).join(format!("file {num}.rs"))).collect();
let mut set = HashSet::new();
paths.iter().for_each(|p| {
set.insert(p.as_path());
});
b.iter(|| {
set.remove(paths[500].as_path());
set.insert(black_box(paths[500].as_path()))
});
}
#[bench]
#[cfg_attr(miri, ignore)] // Miri isn't fast...
fn bench_path_hashset_miss(b: &mut test::Bencher) {
let prefix = "/my/home/is/my/castle/and/my/castle/has/a/rusty/workbench/";
let paths: Vec<_> =
(0..1000).map(|num| PathBuf::from(prefix).join(format!("file {num}.rs"))).collect();
let mut set = HashSet::new();
paths.iter().for_each(|p| {
set.insert(p.as_path());
});
let probe = PathBuf::from(prefix).join("other");
b.iter(|| set.remove(black_box(probe.as_path())));
}
#[bench]
fn bench_hash_path_short(b: &mut test::Bencher) {
let mut hasher = DefaultHasher::new();
let path = Path::new("explorer.exe");
b.iter(|| black_box(path).hash(&mut hasher));
black_box(hasher.finish());
}
#[bench]
fn bench_hash_path_long(b: &mut test::Bencher) {
let mut hasher = DefaultHasher::new();
let path =
Path::new("/aaaaa/aaaaaa/./../aaaaaaaa/bbbbbbbbbbbbb/ccccccccccc/ddddddddd/eeeeeee.fff");
b.iter(|| black_box(path).hash(&mut hasher));
black_box(hasher.finish());
}
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