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https://github.com/rust-lang/rust.git
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380 lines
11 KiB
Rust
380 lines
11 KiB
Rust
use std::{mem, ptr};
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use rand::Rng;
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use rand::distributions::{Alphanumeric, DistString, Standard};
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use test::{Bencher, black_box};
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#[bench]
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fn iterator(b: &mut Bencher) {
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// peculiar numbers to stop LLVM from optimising the summation
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// out.
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let v: Vec<_> = (0..100).map(|i| i ^ (i << 1) ^ (i >> 1)).collect();
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b.iter(|| {
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let mut sum = 0;
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for x in &v {
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sum += *x;
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}
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// sum == 11806, to stop dead code elimination.
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if sum == 0 {
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panic!()
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}
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})
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}
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#[bench]
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fn mut_iterator(b: &mut Bencher) {
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let mut v = vec![0; 100];
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b.iter(|| {
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let mut i = 0;
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for x in &mut v {
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*x = i;
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i += 1;
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}
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})
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}
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#[bench]
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fn concat(b: &mut Bencher) {
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let xss: Vec<Vec<i32>> = (0..100).map(|i| (0..i).collect()).collect();
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b.iter(|| {
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xss.concat();
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});
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}
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#[bench]
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fn join(b: &mut Bencher) {
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let xss: Vec<Vec<i32>> = (0..100).map(|i| (0..i).collect()).collect();
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b.iter(|| xss.join(&0));
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}
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#[bench]
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fn push(b: &mut Bencher) {
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let mut vec = Vec::<i32>::new();
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b.iter(|| {
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vec.push(0);
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black_box(&vec);
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});
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}
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#[bench]
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fn starts_with_same_vector(b: &mut Bencher) {
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let vec: Vec<_> = (0..100).collect();
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b.iter(|| vec.starts_with(&vec))
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}
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#[bench]
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fn starts_with_single_element(b: &mut Bencher) {
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let vec: Vec<_> = vec![0];
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b.iter(|| vec.starts_with(&vec))
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}
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#[bench]
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fn starts_with_diff_one_element_at_end(b: &mut Bencher) {
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let vec: Vec<_> = (0..100).collect();
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let mut match_vec: Vec<_> = (0..99).collect();
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match_vec.push(0);
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b.iter(|| vec.starts_with(&match_vec))
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}
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#[bench]
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fn ends_with_same_vector(b: &mut Bencher) {
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let vec: Vec<_> = (0..100).collect();
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b.iter(|| vec.ends_with(&vec))
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}
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#[bench]
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fn ends_with_single_element(b: &mut Bencher) {
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let vec: Vec<_> = vec![0];
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b.iter(|| vec.ends_with(&vec))
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}
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#[bench]
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fn ends_with_diff_one_element_at_beginning(b: &mut Bencher) {
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let vec: Vec<_> = (0..100).collect();
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let mut match_vec: Vec<_> = (0..100).collect();
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match_vec[0] = 200;
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b.iter(|| vec.starts_with(&match_vec))
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}
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#[bench]
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fn contains_last_element(b: &mut Bencher) {
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let vec: Vec<_> = (0..100).collect();
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b.iter(|| vec.contains(&99))
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}
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#[bench]
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fn zero_1kb_from_elem(b: &mut Bencher) {
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b.iter(|| vec![0u8; 1024]);
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}
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#[bench]
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fn zero_1kb_set_memory(b: &mut Bencher) {
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b.iter(|| {
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let mut v = Vec::<u8>::with_capacity(1024);
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unsafe {
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let vp = v.as_mut_ptr();
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ptr::write_bytes(vp, 0, 1024);
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v.set_len(1024);
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}
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v
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});
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}
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#[bench]
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fn zero_1kb_loop_set(b: &mut Bencher) {
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b.iter(|| {
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let mut v = Vec::<u8>::with_capacity(1024);
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unsafe {
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v.set_len(1024);
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}
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for i in 0..1024 {
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v[i] = 0;
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}
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});
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}
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#[bench]
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fn zero_1kb_mut_iter(b: &mut Bencher) {
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b.iter(|| {
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let mut v = Vec::<u8>::with_capacity(1024);
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unsafe {
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v.set_len(1024);
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}
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for x in &mut v {
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*x = 0;
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}
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v
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});
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}
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#[bench]
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fn random_inserts(b: &mut Bencher) {
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let mut rng = crate::bench_rng();
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b.iter(|| {
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let mut v = vec![(0, 0); 30];
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for _ in 0..100 {
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let l = v.len();
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v.insert(rng.gen::<usize>() % (l + 1), (1, 1));
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}
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})
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}
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#[bench]
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fn random_removes(b: &mut Bencher) {
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let mut rng = crate::bench_rng();
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b.iter(|| {
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let mut v = vec![(0, 0); 130];
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for _ in 0..100 {
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let l = v.len();
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v.remove(rng.gen::<usize>() % l);
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}
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})
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}
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fn gen_ascending(len: usize) -> Vec<u64> {
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(0..len as u64).collect()
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}
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fn gen_descending(len: usize) -> Vec<u64> {
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(0..len as u64).rev().collect()
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}
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fn gen_random(len: usize) -> Vec<u64> {
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let mut rng = crate::bench_rng();
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(&mut rng).sample_iter(&Standard).take(len).collect()
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}
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fn gen_random_bytes(len: usize) -> Vec<u8> {
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let mut rng = crate::bench_rng();
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(&mut rng).sample_iter(&Standard).take(len).collect()
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}
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fn gen_mostly_ascending(len: usize) -> Vec<u64> {
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let mut rng = crate::bench_rng();
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let mut v = gen_ascending(len);
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for _ in (0usize..).take_while(|x| x * x <= len) {
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let x = rng.gen::<usize>() % len;
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let y = rng.gen::<usize>() % len;
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v.swap(x, y);
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}
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v
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}
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fn gen_mostly_descending(len: usize) -> Vec<u64> {
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let mut rng = crate::bench_rng();
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let mut v = gen_descending(len);
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for _ in (0usize..).take_while(|x| x * x <= len) {
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let x = rng.gen::<usize>() % len;
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let y = rng.gen::<usize>() % len;
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v.swap(x, y);
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}
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v
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}
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fn gen_strings(len: usize) -> Vec<String> {
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let mut rng = crate::bench_rng();
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let mut v = vec![];
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for _ in 0..len {
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let n = rng.gen::<usize>() % 20 + 1;
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v.push(Alphanumeric.sample_string(&mut rng, n));
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}
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v
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}
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fn gen_big_random(len: usize) -> Vec<[u64; 16]> {
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let mut rng = crate::bench_rng();
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(&mut rng).sample_iter(&Standard).map(|x| [x; 16]).take(len).collect()
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}
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macro_rules! sort {
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($f:ident, $name:ident, $gen:expr, $len:expr) => {
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#[bench]
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fn $name(b: &mut Bencher) {
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let v = $gen($len);
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b.iter(|| v.clone().$f());
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b.bytes = $len * mem::size_of_val(&$gen(1)[0]) as u64;
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}
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};
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}
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macro_rules! sort_strings {
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($f:ident, $name:ident, $gen:expr, $len:expr) => {
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#[bench]
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fn $name(b: &mut Bencher) {
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let v = $gen($len);
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let v = v.iter().map(|s| &**s).collect::<Vec<&str>>();
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b.iter(|| v.clone().$f());
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b.bytes = $len * mem::size_of::<&str>() as u64;
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}
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};
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}
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macro_rules! sort_expensive {
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($f:ident, $name:ident, $gen:expr, $len:expr) => {
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#[bench]
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fn $name(b: &mut Bencher) {
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let v = $gen($len);
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b.iter(|| {
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let mut v = v.clone();
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let mut count = 0;
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v.$f(|a: &u64, b: &u64| {
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count += 1;
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if count % 1_000_000_000 == 0 {
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panic!("should not happen");
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}
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(*a as f64).cos().partial_cmp(&(*b as f64).cos()).unwrap()
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});
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black_box(count);
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});
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b.bytes = $len * mem::size_of_val(&$gen(1)[0]) as u64;
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}
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};
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}
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macro_rules! sort_lexicographic {
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($f:ident, $name:ident, $gen:expr, $len:expr) => {
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#[bench]
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fn $name(b: &mut Bencher) {
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let v = $gen($len);
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b.iter(|| v.clone().$f(|x| x.to_string()));
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b.bytes = $len * mem::size_of_val(&$gen(1)[0]) as u64;
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}
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};
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}
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sort!(sort, sort_small_ascending, gen_ascending, 10);
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sort!(sort, sort_small_descending, gen_descending, 10);
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sort!(sort, sort_small_random, gen_random, 10);
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sort!(sort, sort_small_big, gen_big_random, 10);
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sort!(sort, sort_medium_random, gen_random, 100);
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sort!(sort, sort_large_ascending, gen_ascending, 10000);
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sort!(sort, sort_large_descending, gen_descending, 10000);
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sort!(sort, sort_large_mostly_ascending, gen_mostly_ascending, 10000);
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sort!(sort, sort_large_mostly_descending, gen_mostly_descending, 10000);
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sort!(sort, sort_large_random, gen_random, 10000);
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sort!(sort, sort_large_big, gen_big_random, 10000);
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sort_strings!(sort, sort_large_strings, gen_strings, 10000);
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sort_expensive!(sort_by, sort_large_expensive, gen_random, 10000);
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sort!(sort_unstable, sort_unstable_small_ascending, gen_ascending, 10);
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sort!(sort_unstable, sort_unstable_small_descending, gen_descending, 10);
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sort!(sort_unstable, sort_unstable_small_random, gen_random, 10);
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sort!(sort_unstable, sort_unstable_small_big, gen_big_random, 10);
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sort!(sort_unstable, sort_unstable_medium_random, gen_random, 100);
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sort!(sort_unstable, sort_unstable_large_ascending, gen_ascending, 10000);
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sort!(sort_unstable, sort_unstable_large_descending, gen_descending, 10000);
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sort!(sort_unstable, sort_unstable_large_mostly_ascending, gen_mostly_ascending, 10000);
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sort!(sort_unstable, sort_unstable_large_mostly_descending, gen_mostly_descending, 10000);
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sort!(sort_unstable, sort_unstable_large_random, gen_random, 10000);
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sort!(sort_unstable, sort_unstable_large_big, gen_big_random, 10000);
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sort_strings!(sort_unstable, sort_unstable_large_strings, gen_strings, 10000);
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sort_expensive!(sort_unstable_by, sort_unstable_large_expensive, gen_random, 10000);
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sort_lexicographic!(sort_by_key, sort_by_key_lexicographic, gen_random, 10000);
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sort_lexicographic!(sort_unstable_by_key, sort_unstable_by_key_lexicographic, gen_random, 10000);
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sort_lexicographic!(sort_by_cached_key, sort_by_cached_key_lexicographic, gen_random, 10000);
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macro_rules! reverse {
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($name:ident, $ty:ty, $f:expr) => {
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#[bench]
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fn $name(b: &mut Bencher) {
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// odd length and offset by 1 to be as unaligned as possible
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let n = 0xFFFFF;
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let mut v: Vec<_> = (0..1 + (n / mem::size_of::<$ty>() as u64)).map($f).collect();
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b.iter(|| black_box(&mut v[1..]).reverse());
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b.bytes = n;
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}
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};
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}
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reverse!(reverse_u8, u8, |x| x as u8);
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reverse!(reverse_u16, u16, |x| x as u16);
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reverse!(reverse_u8x3, [u8; 3], |x| [x as u8, (x >> 8) as u8, (x >> 16) as u8]);
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reverse!(reverse_u32, u32, |x| x as u32);
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reverse!(reverse_u64, u64, |x| x as u64);
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reverse!(reverse_u128, u128, |x| x as u128);
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#[repr(simd)]
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struct F64x4([f64; 4]);
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reverse!(reverse_simd_f64x4, F64x4, |x| {
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let x = x as f64;
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F64x4([x, x, x, x])
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});
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macro_rules! rotate {
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($name:ident, $gen:expr, $len:expr, $mid:expr) => {
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#[bench]
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fn $name(b: &mut Bencher) {
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let size = mem::size_of_val(&$gen(1)[0]);
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let mut v = $gen($len * 8 / size);
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b.iter(|| black_box(&mut v).rotate_left(($mid * 8 + size - 1) / size));
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b.bytes = (v.len() * size) as u64;
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}
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};
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}
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rotate!(rotate_tiny_by1, gen_random, 16, 1);
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rotate!(rotate_tiny_half, gen_random, 16, 16 / 2);
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rotate!(rotate_tiny_half_plus_one, gen_random, 16, 16 / 2 + 1);
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rotate!(rotate_medium_by1, gen_random, 9158, 1);
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rotate!(rotate_medium_by727_u64, gen_random, 9158, 727);
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rotate!(rotate_medium_by727_bytes, gen_random_bytes, 9158, 727);
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rotate!(rotate_medium_by727_strings, gen_strings, 9158, 727);
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rotate!(rotate_medium_half, gen_random, 9158, 9158 / 2);
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rotate!(rotate_medium_half_plus_one, gen_random, 9158, 9158 / 2 + 1);
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// Intended to use more RAM than the machine has cache
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rotate!(rotate_huge_by1, gen_random, 5 * 1024 * 1024, 1);
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rotate!(rotate_huge_by9199_u64, gen_random, 5 * 1024 * 1024, 9199);
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rotate!(rotate_huge_by9199_bytes, gen_random_bytes, 5 * 1024 * 1024, 9199);
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rotate!(rotate_huge_by9199_strings, gen_strings, 5 * 1024 * 1024, 9199);
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rotate!(rotate_huge_by9199_big, gen_big_random, 5 * 1024 * 1024, 9199);
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rotate!(rotate_huge_by1234577_u64, gen_random, 5 * 1024 * 1024, 1234577);
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rotate!(rotate_huge_by1234577_bytes, gen_random_bytes, 5 * 1024 * 1024, 1234577);
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rotate!(rotate_huge_by1234577_strings, gen_strings, 5 * 1024 * 1024, 1234577);
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rotate!(rotate_huge_by1234577_big, gen_big_random, 5 * 1024 * 1024, 1234577);
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rotate!(rotate_huge_half, gen_random, 5 * 1024 * 1024, 5 * 1024 * 1024 / 2);
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rotate!(rotate_huge_half_plus_one, gen_random, 5 * 1024 * 1024, 5 * 1024 * 1024 / 2 + 1);
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