332 lines
8.3 KiB
Rust
332 lines
8.3 KiB
Rust
// This benchmark suite contains some benchmarks along a set of dimensions:
|
|
// Hasher: std default (SipHash) and crate default (AHash).
|
|
// Int key distribution: low bit heavy, top bit heavy, and random.
|
|
// Task: basic functionality: insert, insert_erase, lookup, lookup_fail, iter
|
|
#![feature(test)]
|
|
|
|
extern crate test;
|
|
|
|
use test::{black_box, Bencher};
|
|
|
|
use hashbrown::hash_map::DefaultHashBuilder;
|
|
use hashbrown::{HashMap, HashSet};
|
|
use std::{
|
|
collections::hash_map::RandomState,
|
|
sync::atomic::{self, AtomicUsize},
|
|
};
|
|
|
|
const SIZE: usize = 1000;
|
|
|
|
// The default hashmap when using this crate directly.
|
|
type AHashMap<K, V> = HashMap<K, V, DefaultHashBuilder>;
|
|
// This uses the hashmap from this crate with the default hasher of the stdlib.
|
|
type StdHashMap<K, V> = HashMap<K, V, RandomState>;
|
|
|
|
// A random key iterator.
|
|
#[derive(Clone, Copy)]
|
|
struct RandomKeys {
|
|
state: usize,
|
|
}
|
|
|
|
impl RandomKeys {
|
|
fn new() -> Self {
|
|
RandomKeys { state: 0 }
|
|
}
|
|
}
|
|
|
|
impl Iterator for RandomKeys {
|
|
type Item = usize;
|
|
fn next(&mut self) -> Option<usize> {
|
|
// Add 1 then multiply by some 32 bit prime.
|
|
self.state = self.state.wrapping_add(1).wrapping_mul(3_787_392_781);
|
|
Some(self.state)
|
|
}
|
|
}
|
|
|
|
// Just an arbitrary side effect to make the maps not shortcircuit to the non-dropping path
|
|
// when dropping maps/entries (most real world usages likely have drop in the key or value)
|
|
lazy_static::lazy_static! {
|
|
static ref SIDE_EFFECT: AtomicUsize = AtomicUsize::new(0);
|
|
}
|
|
|
|
#[derive(Clone)]
|
|
struct DropType(usize);
|
|
impl Drop for DropType {
|
|
fn drop(&mut self) {
|
|
SIDE_EFFECT.fetch_add(self.0, atomic::Ordering::SeqCst);
|
|
}
|
|
}
|
|
|
|
macro_rules! bench_suite {
|
|
($bench_macro:ident, $bench_ahash_serial:ident, $bench_std_serial:ident,
|
|
$bench_ahash_highbits:ident, $bench_std_highbits:ident,
|
|
$bench_ahash_random:ident, $bench_std_random:ident) => {
|
|
$bench_macro!($bench_ahash_serial, AHashMap, 0..);
|
|
$bench_macro!($bench_std_serial, StdHashMap, 0..);
|
|
$bench_macro!(
|
|
$bench_ahash_highbits,
|
|
AHashMap,
|
|
(0..).map(usize::swap_bytes)
|
|
);
|
|
$bench_macro!(
|
|
$bench_std_highbits,
|
|
StdHashMap,
|
|
(0..).map(usize::swap_bytes)
|
|
);
|
|
$bench_macro!($bench_ahash_random, AHashMap, RandomKeys::new());
|
|
$bench_macro!($bench_std_random, StdHashMap, RandomKeys::new());
|
|
};
|
|
}
|
|
|
|
macro_rules! bench_insert {
|
|
($name:ident, $maptype:ident, $keydist:expr) => {
|
|
#[bench]
|
|
fn $name(b: &mut Bencher) {
|
|
let mut m = $maptype::with_capacity_and_hasher(SIZE, Default::default());
|
|
b.iter(|| {
|
|
m.clear();
|
|
for i in ($keydist).take(SIZE) {
|
|
m.insert(i, (DropType(i), [i; 20]));
|
|
}
|
|
black_box(&mut m);
|
|
});
|
|
eprintln!("{}", SIDE_EFFECT.load(atomic::Ordering::SeqCst));
|
|
}
|
|
};
|
|
}
|
|
|
|
bench_suite!(
|
|
bench_insert,
|
|
insert_ahash_serial,
|
|
insert_std_serial,
|
|
insert_ahash_highbits,
|
|
insert_std_highbits,
|
|
insert_ahash_random,
|
|
insert_std_random
|
|
);
|
|
|
|
macro_rules! bench_grow_insert {
|
|
($name:ident, $maptype:ident, $keydist:expr) => {
|
|
#[bench]
|
|
fn $name(b: &mut Bencher) {
|
|
b.iter(|| {
|
|
let mut m = $maptype::default();
|
|
for i in ($keydist).take(SIZE) {
|
|
m.insert(i, DropType(i));
|
|
}
|
|
black_box(&mut m);
|
|
})
|
|
}
|
|
};
|
|
}
|
|
|
|
bench_suite!(
|
|
bench_grow_insert,
|
|
grow_insert_ahash_serial,
|
|
grow_insert_std_serial,
|
|
grow_insert_ahash_highbits,
|
|
grow_insert_std_highbits,
|
|
grow_insert_ahash_random,
|
|
grow_insert_std_random
|
|
);
|
|
|
|
macro_rules! bench_insert_erase {
|
|
($name:ident, $maptype:ident, $keydist:expr) => {
|
|
#[bench]
|
|
fn $name(b: &mut Bencher) {
|
|
let mut base = $maptype::default();
|
|
for i in ($keydist).take(SIZE) {
|
|
base.insert(i, DropType(i));
|
|
}
|
|
let skip = $keydist.skip(SIZE);
|
|
b.iter(|| {
|
|
let mut m = base.clone();
|
|
let mut add_iter = skip.clone();
|
|
let mut remove_iter = $keydist;
|
|
// While keeping the size constant,
|
|
// replace the first keydist with the second.
|
|
for (add, remove) in (&mut add_iter).zip(&mut remove_iter).take(SIZE) {
|
|
m.insert(add, DropType(add));
|
|
black_box(m.remove(&remove));
|
|
}
|
|
black_box(m);
|
|
});
|
|
eprintln!("{}", SIDE_EFFECT.load(atomic::Ordering::SeqCst));
|
|
}
|
|
};
|
|
}
|
|
|
|
bench_suite!(
|
|
bench_insert_erase,
|
|
insert_erase_ahash_serial,
|
|
insert_erase_std_serial,
|
|
insert_erase_ahash_highbits,
|
|
insert_erase_std_highbits,
|
|
insert_erase_ahash_random,
|
|
insert_erase_std_random
|
|
);
|
|
|
|
macro_rules! bench_lookup {
|
|
($name:ident, $maptype:ident, $keydist:expr) => {
|
|
#[bench]
|
|
fn $name(b: &mut Bencher) {
|
|
let mut m = $maptype::default();
|
|
for i in $keydist.take(SIZE) {
|
|
m.insert(i, DropType(i));
|
|
}
|
|
|
|
b.iter(|| {
|
|
for i in $keydist.take(SIZE) {
|
|
black_box(m.get(&i));
|
|
}
|
|
});
|
|
eprintln!("{}", SIDE_EFFECT.load(atomic::Ordering::SeqCst));
|
|
}
|
|
};
|
|
}
|
|
|
|
bench_suite!(
|
|
bench_lookup,
|
|
lookup_ahash_serial,
|
|
lookup_std_serial,
|
|
lookup_ahash_highbits,
|
|
lookup_std_highbits,
|
|
lookup_ahash_random,
|
|
lookup_std_random
|
|
);
|
|
|
|
macro_rules! bench_lookup_fail {
|
|
($name:ident, $maptype:ident, $keydist:expr) => {
|
|
#[bench]
|
|
fn $name(b: &mut Bencher) {
|
|
let mut m = $maptype::default();
|
|
let mut iter = $keydist;
|
|
for i in (&mut iter).take(SIZE) {
|
|
m.insert(i, DropType(i));
|
|
}
|
|
|
|
b.iter(|| {
|
|
for i in (&mut iter).take(SIZE) {
|
|
black_box(m.get(&i));
|
|
}
|
|
})
|
|
}
|
|
};
|
|
}
|
|
|
|
bench_suite!(
|
|
bench_lookup_fail,
|
|
lookup_fail_ahash_serial,
|
|
lookup_fail_std_serial,
|
|
lookup_fail_ahash_highbits,
|
|
lookup_fail_std_highbits,
|
|
lookup_fail_ahash_random,
|
|
lookup_fail_std_random
|
|
);
|
|
|
|
macro_rules! bench_iter {
|
|
($name:ident, $maptype:ident, $keydist:expr) => {
|
|
#[bench]
|
|
fn $name(b: &mut Bencher) {
|
|
let mut m = $maptype::default();
|
|
for i in ($keydist).take(SIZE) {
|
|
m.insert(i, DropType(i));
|
|
}
|
|
|
|
b.iter(|| {
|
|
for i in &m {
|
|
black_box(i);
|
|
}
|
|
})
|
|
}
|
|
};
|
|
}
|
|
|
|
bench_suite!(
|
|
bench_iter,
|
|
iter_ahash_serial,
|
|
iter_std_serial,
|
|
iter_ahash_highbits,
|
|
iter_std_highbits,
|
|
iter_ahash_random,
|
|
iter_std_random
|
|
);
|
|
|
|
#[bench]
|
|
fn clone_small(b: &mut Bencher) {
|
|
let mut m = HashMap::new();
|
|
for i in 0..10 {
|
|
m.insert(i, DropType(i));
|
|
}
|
|
|
|
b.iter(|| {
|
|
black_box(m.clone());
|
|
})
|
|
}
|
|
|
|
#[bench]
|
|
fn clone_from_small(b: &mut Bencher) {
|
|
let mut m = HashMap::new();
|
|
let mut m2 = HashMap::new();
|
|
for i in 0..10 {
|
|
m.insert(i, DropType(i));
|
|
}
|
|
|
|
b.iter(|| {
|
|
m2.clone_from(&m);
|
|
black_box(&mut m2);
|
|
})
|
|
}
|
|
|
|
#[bench]
|
|
fn clone_large(b: &mut Bencher) {
|
|
let mut m = HashMap::new();
|
|
for i in 0..1000 {
|
|
m.insert(i, DropType(i));
|
|
}
|
|
|
|
b.iter(|| {
|
|
black_box(m.clone());
|
|
})
|
|
}
|
|
|
|
#[bench]
|
|
fn clone_from_large(b: &mut Bencher) {
|
|
let mut m = HashMap::new();
|
|
let mut m2 = HashMap::new();
|
|
for i in 0..1000 {
|
|
m.insert(i, DropType(i));
|
|
}
|
|
|
|
b.iter(|| {
|
|
m2.clone_from(&m);
|
|
black_box(&mut m2);
|
|
})
|
|
}
|
|
|
|
#[bench]
|
|
fn rehash_in_place(b: &mut Bencher) {
|
|
b.iter(|| {
|
|
let mut set = HashSet::new();
|
|
|
|
// Each loop triggers one rehash
|
|
for _ in 0..10 {
|
|
for i in 0..224 {
|
|
set.insert(i);
|
|
}
|
|
|
|
assert_eq!(
|
|
set.capacity(),
|
|
224,
|
|
"The set must be at or close to capacity to trigger a re hashing"
|
|
);
|
|
|
|
for i in 100..1400 {
|
|
set.remove(&(i - 100));
|
|
set.insert(i);
|
|
}
|
|
set.clear();
|
|
}
|
|
});
|
|
}
|