mirror of https://github.com/rust-lang/rust
105 lines
1.6 KiB
Rust
105 lines
1.6 KiB
Rust
#![cfg(test)]
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use std::collections::HashMap;
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use test::Bencher;
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#[bench]
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fn new_drop(b: &mut Bencher) {
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b.iter(|| {
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let m: HashMap<i32, i32> = HashMap::new();
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assert_eq!(m.len(), 0);
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})
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}
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#[bench]
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fn new_insert_drop(b: &mut Bencher) {
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b.iter(|| {
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let mut m = HashMap::new();
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m.insert(0, 0);
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assert_eq!(m.len(), 1);
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})
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}
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#[bench]
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fn grow_by_insertion(b: &mut Bencher) {
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let mut m = HashMap::new();
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for i in 1..1001 {
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m.insert(i, i);
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}
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let mut k = 1001;
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b.iter(|| {
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m.insert(k, k);
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k += 1;
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});
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}
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#[bench]
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fn find_existing(b: &mut Bencher) {
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let mut m = HashMap::new();
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for i in 1..1001 {
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m.insert(i, i);
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}
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b.iter(|| {
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for i in 1..1001 {
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m.contains_key(&i);
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}
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});
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}
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#[bench]
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fn find_nonexisting(b: &mut Bencher) {
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let mut m = HashMap::new();
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for i in 1..1001 {
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m.insert(i, i);
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}
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b.iter(|| {
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for i in 1001..2001 {
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m.contains_key(&i);
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}
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});
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}
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#[bench]
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fn hashmap_as_queue(b: &mut Bencher) {
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let mut m = HashMap::new();
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for i in 1..1001 {
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m.insert(i, i);
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}
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let mut k = 1;
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b.iter(|| {
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m.remove(&k);
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m.insert(k + 1000, k + 1000);
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k += 1;
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});
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}
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#[bench]
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fn get_remove_insert(b: &mut Bencher) {
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let mut m = HashMap::new();
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for i in 1..1001 {
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m.insert(i, i);
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}
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let mut k = 1;
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b.iter(|| {
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m.get(&(k + 400));
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m.get(&(k + 2000));
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m.remove(&k);
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m.insert(k + 1000, k + 1000);
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k += 1;
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})
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}
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