mirror of
https://github.com/italicsjenga/agb.git
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319 lines
8.3 KiB
Rust
319 lines
8.3 KiB
Rust
// These benchmarks were taken from hashbrown. They are impossible to run
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// on the target GBA hardware, but hopefully running these on something like a
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// raspberry pi zero will give something comparable.
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// This benchmark suite contains some benchmarks along a set of dimensions:
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// Int key distribution: low bit heavy, top bit heavy, and random.
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// Task: basic functionality: insert, insert_erase, lookup, lookup_fail, iter
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#![feature(test)]
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extern crate test;
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use test::{black_box, Bencher};
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use agb_hashmap::HashMap;
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use std::sync::atomic::{self, AtomicUsize};
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const SIZE: usize = 1000;
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type StdHashMap<K, V> = std::collections::hash_map::HashMap<K, V>;
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// A random key iterator.
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#[derive(Clone, Copy)]
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struct RandomKeys {
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state: usize,
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}
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impl RandomKeys {
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fn new() -> Self {
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RandomKeys { state: 0 }
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}
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}
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impl Iterator for RandomKeys {
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type Item = usize;
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fn next(&mut self) -> Option<usize> {
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// Add 1 then multiply by some 32 bit prime.
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self.state = self.state.wrapping_add(1).wrapping_mul(3_787_392_781);
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Some(self.state)
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}
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}
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// Just an arbitrary side effect to make the maps not shortcircuit to the non-dropping path
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// when dropping maps/entries (most real world usages likely have drop in the key or value)
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lazy_static::lazy_static! {
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static ref SIDE_EFFECT: AtomicUsize = AtomicUsize::new(0);
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}
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#[derive(Clone)]
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struct DropType(usize);
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impl Drop for DropType {
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fn drop(&mut self) {
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SIDE_EFFECT.fetch_add(self.0, atomic::Ordering::SeqCst);
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}
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}
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macro_rules! bench_suite {
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($bench_macro:ident, $bench_agb_hashmap_serial:ident, $bench_std_serial:ident,
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$bench_agb_hashmap_highbits:ident, $bench_std_highbits:ident,
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$bench_agb_hashmap_random:ident, $bench_std_random:ident) => {
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$bench_macro!($bench_agb_hashmap_serial, HashMap, 0..);
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$bench_macro!($bench_std_serial, StdHashMap, 0..);
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$bench_macro!(
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$bench_agb_hashmap_highbits,
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HashMap,
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(0..).map(usize::swap_bytes)
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);
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$bench_macro!(
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$bench_std_highbits,
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StdHashMap,
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(0..).map(usize::swap_bytes)
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);
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$bench_macro!($bench_agb_hashmap_random, HashMap, RandomKeys::new());
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$bench_macro!($bench_std_random, StdHashMap, RandomKeys::new());
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};
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}
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macro_rules! bench_insert {
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($name:ident, $maptype:ident, $keydist:expr) => {
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#[bench]
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fn $name(b: &mut Bencher) {
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let mut m = $maptype::with_capacity(SIZE);
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b.iter(|| {
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m.clear();
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for i in ($keydist).take(SIZE) {
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m.insert(i, (DropType(i), [i; 20]));
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}
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black_box(&mut m);
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});
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eprintln!("{}", SIDE_EFFECT.load(atomic::Ordering::SeqCst));
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}
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};
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}
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bench_suite!(
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bench_insert,
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insert_agb_hashmap_serial,
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insert_std_serial,
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insert_agb_hashmap_highbits,
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insert_std_highbits,
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insert_agb_hashmap_random,
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insert_std_random
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);
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macro_rules! bench_grow_insert {
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($name:ident, $maptype:ident, $keydist: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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let mut m = $maptype::default();
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for i in ($keydist).take(SIZE) {
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m.insert(i, DropType(i));
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}
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black_box(&mut m);
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})
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}
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};
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}
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bench_suite!(
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bench_grow_insert,
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grow_insert_agb_hashmap_serial,
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grow_insert_std_serial,
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grow_insert_agb_hashmap_highbits,
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grow_insert_std_highbits,
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grow_insert_agb_hashmap_random,
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grow_insert_std_random
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);
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macro_rules! bench_insert_erase {
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($name:ident, $maptype:ident, $keydist:expr) => {
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#[bench]
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fn $name(b: &mut Bencher) {
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let mut base = $maptype::default();
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for i in ($keydist).take(SIZE) {
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base.insert(i, DropType(i));
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}
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let skip = $keydist.skip(SIZE);
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b.iter(|| {
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let mut m = base.clone();
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let mut add_iter = skip.clone();
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let mut remove_iter = $keydist;
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// While keeping the size constant,
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// replace the first keydist with the second.
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for (add, remove) in (&mut add_iter).zip(&mut remove_iter).take(SIZE) {
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m.insert(add, DropType(add));
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black_box(m.remove(&remove));
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}
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black_box(m);
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});
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eprintln!("{}", SIDE_EFFECT.load(atomic::Ordering::SeqCst));
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}
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};
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}
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bench_suite!(
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bench_insert_erase,
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insert_erase_agb_hashmap_serial,
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insert_erase_std_serial,
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insert_erase_agb_hashmap_highbits,
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insert_erase_std_highbits,
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insert_erase_agb_hashmap_random,
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insert_erase_std_random
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);
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macro_rules! bench_lookup {
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($name:ident, $maptype:ident, $keydist:expr) => {
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#[bench]
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fn $name(b: &mut Bencher) {
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let mut m = $maptype::default();
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for i in $keydist.take(SIZE) {
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m.insert(i, DropType(i));
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}
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b.iter(|| {
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for i in $keydist.take(SIZE) {
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black_box(m.get(&i));
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}
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});
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eprintln!("{}", SIDE_EFFECT.load(atomic::Ordering::SeqCst));
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}
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};
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}
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bench_suite!(
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bench_lookup,
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lookup_agb_hashmap_serial,
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lookup_std_serial,
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lookup_agb_hashmap_highbits,
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lookup_std_highbits,
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lookup_agb_hashmap_random,
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lookup_std_random
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);
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macro_rules! bench_lookup_fail {
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($name:ident, $maptype:ident, $keydist:expr) => {
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#[bench]
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fn $name(b: &mut Bencher) {
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let mut m = $maptype::default();
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let mut iter = $keydist;
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for i in (&mut iter).take(SIZE) {
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m.insert(i, DropType(i));
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}
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b.iter(|| {
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for i in (&mut iter).take(SIZE) {
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black_box(m.get(&i));
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}
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})
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}
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};
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}
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bench_suite!(
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bench_lookup_fail,
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lookup_fail_agb_hashmap_serial,
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lookup_fail_std_serial,
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lookup_fail_agb_hashmap_highbits,
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lookup_fail_std_highbits,
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lookup_fail_agb_hashmap_random,
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lookup_fail_std_random
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);
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macro_rules! bench_iter {
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($name:ident, $maptype:ident, $keydist:expr) => {
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#[bench]
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fn $name(b: &mut Bencher) {
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let mut m = $maptype::default();
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for i in ($keydist).take(SIZE) {
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m.insert(i, DropType(i));
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}
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b.iter(|| {
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for i in &m {
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black_box(i);
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}
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})
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}
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};
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}
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bench_suite!(
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bench_iter,
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iter_agb_hashmap_serial,
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iter_std_serial,
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iter_agb_hashmap_highbits,
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iter_std_highbits,
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iter_agb_hashmap_random,
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iter_std_random
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);
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macro_rules! clone_bench {
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($maptype:ident) => {
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use super::DropType;
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use test::{black_box, Bencher};
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#[bench]
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fn clone_small(b: &mut Bencher) {
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let mut m = $maptype::new();
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for i in 0..10 {
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m.insert(i, DropType(i));
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}
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b.iter(|| {
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black_box(m.clone());
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})
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}
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#[bench]
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fn clone_from_small(b: &mut Bencher) {
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let mut m = $maptype::new();
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let mut m2 = $maptype::new();
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for i in 0..10 {
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m.insert(i, DropType(i));
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}
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b.iter(|| {
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m2.clone_from(&m);
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black_box(&mut m2);
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})
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}
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#[bench]
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fn clone_large(b: &mut Bencher) {
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let mut m = $maptype::new();
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for i in 0..1000 {
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m.insert(i, DropType(i));
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}
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b.iter(|| {
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black_box(m.clone());
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})
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}
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#[bench]
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fn clone_from_large(b: &mut Bencher) {
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let mut m = $maptype::new();
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let mut m2 = $maptype::new();
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for i in 0..1000 {
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m.insert(i, DropType(i));
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}
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b.iter(|| {
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m2.clone_from(&m);
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black_box(&mut m2);
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})
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}
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};
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}
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mod agb_hashmap_clone_benches {
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use agb_hashmap::HashMap;
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clone_bench!(HashMap);
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}
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mod std_hashmap_clone_benches {
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use std::collections::hash_map::HashMap;
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clone_bench!(HashMap);
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}
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