Files
cli/vendor/hashbrown/benches/with_capacity.rs

39 lines
1.3 KiB
Rust

#![feature(test)]
extern crate test;
use hashbrown::HashMap;
use test::{black_box, Bencher};
type Map<K, V> = HashMap<K, V>;
macro_rules! bench_with_capacity {
($name:ident, $cap:expr) => {
#[bench]
fn $name(b: &mut Bencher) {
b.iter(|| {
// Construct a new empty map with a given capacity and return it to avoid
// being optimized away. Dropping it measures allocation + minimal setup.
let m: Map<usize, usize> = Map::with_capacity($cap);
black_box(m)
});
}
};
}
bench_with_capacity!(with_capacity_000000, 0);
bench_with_capacity!(with_capacity_000001, 1);
bench_with_capacity!(with_capacity_000003, 3);
bench_with_capacity!(with_capacity_000007, 7);
bench_with_capacity!(with_capacity_000008, 8);
bench_with_capacity!(with_capacity_000016, 16);
bench_with_capacity!(with_capacity_000032, 32);
bench_with_capacity!(with_capacity_000064, 64);
bench_with_capacity!(with_capacity_000128, 128);
bench_with_capacity!(with_capacity_000256, 256);
bench_with_capacity!(with_capacity_000512, 512);
bench_with_capacity!(with_capacity_001024, 1024);
bench_with_capacity!(with_capacity_004096, 4096);
bench_with_capacity!(with_capacity_016384, 16384);
bench_with_capacity!(with_capacity_065536, 65536);