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Rollup merge of rust-lang#59186 - ssomers:btreeset_intersection_revis…
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…ited_again, r=KodrAus

improve worst-case performance of BTreeSet intersection v3

Variation of [rust-lang#59078](rust-lang#59078) with `Intersection` remaining a struct

r? @scottmcm
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@Centril
Centril authored Apr 3, 2019
2 parents 2f37c5a + f5fee8f commit 9898182
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114 changes: 57 additions & 57 deletions src/liballoc/benches/btree/set.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -3,86 +3,86 @@ use std::collections::BTreeSet;
use rand::{thread_rng, Rng};
use test::{black_box, Bencher};

fn random(n1: u32, n2: u32) -> [BTreeSet<usize>; 2] {
fn random(n: usize) -> BTreeSet<usize> {
let mut rng = thread_rng();
let mut set1 = BTreeSet::new();
let mut set2 = BTreeSet::new();
for _ in 0..n1 {
let i = rng.gen::<usize>();
set1.insert(i);
let mut set = BTreeSet::new();
while set.len() < n {
set.insert(rng.gen());
}
for _ in 0..n2 {
let i = rng.gen::<usize>();
set2.insert(i);
}
[set1, set2]
assert_eq!(set.len(), n);
set
}

fn staggered(n1: u32, n2: u32) -> [BTreeSet<u32>; 2] {
let mut even = BTreeSet::new();
let mut odd = BTreeSet::new();
for i in 0..n1 {
even.insert(i * 2);
}
for i in 0..n2 {
odd.insert(i * 2 + 1);
fn neg(n: usize) -> BTreeSet<i32> {
let mut set = BTreeSet::new();
for i in -(n as i32)..=-1 {
set.insert(i);
}
[even, odd]
assert_eq!(set.len(), n);
set
}

fn neg_vs_pos(n1: u32, n2: u32) -> [BTreeSet<i32>; 2] {
let mut neg = BTreeSet::new();
let mut pos = BTreeSet::new();
for i in -(n1 as i32)..=-1 {
neg.insert(i);
}
for i in 1..=(n2 as i32) {
pos.insert(i);
fn pos(n: usize) -> BTreeSet<i32> {
let mut set = BTreeSet::new();
for i in 1..=(n as i32) {
set.insert(i);
}
[neg, pos]
assert_eq!(set.len(), n);
set
}

fn pos_vs_neg(n1: u32, n2: u32) -> [BTreeSet<i32>; 2] {
let mut neg = BTreeSet::new();
let mut pos = BTreeSet::new();
for i in -(n1 as i32)..=-1 {
neg.insert(i);
}
for i in 1..=(n2 as i32) {
pos.insert(i);

fn stagger(n1: usize, factor: usize) -> [BTreeSet<u32>; 2] {
let n2 = n1 * factor;
let mut sets = [BTreeSet::new(), BTreeSet::new()];
for i in 0..(n1 + n2) {
let b = i % (factor + 1) != 0;
sets[b as usize].insert(i as u32);
}
[pos, neg]
assert_eq!(sets[0].len(), n1);
assert_eq!(sets[1].len(), n2);
sets
}

macro_rules! set_intersection_bench {
($name: ident, $sets: expr) => {
macro_rules! set_bench {
($name: ident, $set_func: ident, $result_func: ident, $sets: expr) => {
#[bench]
pub fn $name(b: &mut Bencher) {
// setup
let sets = $sets;

// measure
b.iter(|| {
let x = sets[0].intersection(&sets[1]).count();
let x = sets[0].$set_func(&sets[1]).$result_func();
black_box(x);
})
}
};
}

set_intersection_bench! {intersect_random_100, random(100, 100)}
set_intersection_bench! {intersect_random_10k, random(10_000, 10_000)}
set_intersection_bench! {intersect_random_10_vs_10k, random(10, 10_000)}
set_intersection_bench! {intersect_random_10k_vs_10, random(10_000, 10)}
set_intersection_bench! {intersect_staggered_100, staggered(100, 100)}
set_intersection_bench! {intersect_staggered_10k, staggered(10_000, 10_000)}
set_intersection_bench! {intersect_staggered_10_vs_10k, staggered(10, 10_000)}
set_intersection_bench! {intersect_staggered_10k_vs_10, staggered(10_000, 10)}
set_intersection_bench! {intersect_neg_vs_pos_100, neg_vs_pos(100, 100)}
set_intersection_bench! {intersect_neg_vs_pos_10k, neg_vs_pos(10_000, 10_000)}
set_intersection_bench! {intersect_neg_vs_pos_10_vs_10k,neg_vs_pos(10, 10_000)}
set_intersection_bench! {intersect_neg_vs_pos_10k_vs_10,neg_vs_pos(10_000, 10)}
set_intersection_bench! {intersect_pos_vs_neg_100, pos_vs_neg(100, 100)}
set_intersection_bench! {intersect_pos_vs_neg_10k, pos_vs_neg(10_000, 10_000)}
set_intersection_bench! {intersect_pos_vs_neg_10_vs_10k,pos_vs_neg(10, 10_000)}
set_intersection_bench! {intersect_pos_vs_neg_10k_vs_10,pos_vs_neg(10_000, 10)}
set_bench! {intersection_100_neg_vs_100_pos, intersection, count, [neg(100), pos(100)]}
set_bench! {intersection_100_neg_vs_10k_pos, intersection, count, [neg(100), pos(10_000)]}
set_bench! {intersection_100_pos_vs_100_neg, intersection, count, [pos(100), neg(100)]}
set_bench! {intersection_100_pos_vs_10k_neg, intersection, count, [pos(100), neg(10_000)]}
set_bench! {intersection_10k_neg_vs_100_pos, intersection, count, [neg(10_000), pos(100)]}
set_bench! {intersection_10k_neg_vs_10k_pos, intersection, count, [neg(10_000), pos(10_000)]}
set_bench! {intersection_10k_pos_vs_100_neg, intersection, count, [pos(10_000), neg(100)]}
set_bench! {intersection_10k_pos_vs_10k_neg, intersection, count, [pos(10_000), neg(10_000)]}
set_bench! {intersection_random_100_vs_100, intersection, count, [random(100), random(100)]}
set_bench! {intersection_random_100_vs_10k, intersection, count, [random(100), random(10_000)]}
set_bench! {intersection_random_10k_vs_100, intersection, count, [random(10_000), random(100)]}
set_bench! {intersection_random_10k_vs_10k, intersection, count, [random(10_000), random(10_000)]}
set_bench! {intersection_staggered_100_vs_100, intersection, count, stagger(100, 1)}
set_bench! {intersection_staggered_10k_vs_10k, intersection, count, stagger(10_000, 1)}
set_bench! {intersection_staggered_100_vs_10k, intersection, count, stagger(100, 100)}
set_bench! {difference_random_100_vs_100, difference, count, [random(100), random(100)]}
set_bench! {difference_random_100_vs_10k, difference, count, [random(100), random(10_000)]}
set_bench! {difference_random_10k_vs_100, difference, count, [random(10_000), random(100)]}
set_bench! {difference_random_10k_vs_10k, difference, count, [random(10_000), random(10_000)]}
set_bench! {difference_staggered_100_vs_100, difference, count, stagger(100, 1)}
set_bench! {difference_staggered_10k_vs_10k, difference, count, stagger(10_000, 1)}
set_bench! {difference_staggered_100_vs_10k, difference, count, stagger(100, 100)}
set_bench! {is_subset_100_vs_100, is_subset, clone, [pos(100), pos(100)]}
set_bench! {is_subset_100_vs_10k, is_subset, clone, [pos(100), pos(10_000)]}
set_bench! {is_subset_10k_vs_100, is_subset, clone, [pos(10_000), pos(100)]}
set_bench! {is_subset_10k_vs_10k, is_subset, clone, [pos(10_000), pos(10_000)]}
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