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