Jakub Kotur | a425e55 | 2020-12-21 17:28:15 +0100 | [diff] [blame] | 1 | use criterion::{black_box, criterion_group, criterion_main, Criterion}; |
| 2 | use itertools::Itertools; |
| 3 | |
| 4 | // approximate 100_000 iterations for each combination |
| 5 | const N1: usize = 100_000; |
| 6 | const N2: usize = 448; |
| 7 | const N3: usize = 86; |
| 8 | const N4: usize = 41; |
| 9 | |
| 10 | fn comb_for1(c: &mut Criterion) { |
| 11 | c.bench_function("comb for1", move |b| { |
| 12 | b.iter(|| { |
| 13 | for i in 0..N1 { |
| 14 | black_box(i); |
| 15 | } |
| 16 | }) |
| 17 | }); |
| 18 | } |
| 19 | |
| 20 | fn comb_for2(c: &mut Criterion) { |
| 21 | c.bench_function("comb for2", move |b| { |
| 22 | b.iter(|| { |
| 23 | for i in 0..N2 { |
| 24 | for j in (i + 1)..N2 { |
| 25 | black_box(i + j); |
| 26 | } |
| 27 | } |
| 28 | }) |
| 29 | }); |
| 30 | } |
| 31 | |
| 32 | fn comb_for3(c: &mut Criterion) { |
| 33 | c.bench_function("comb for3", move |b| { |
| 34 | b.iter(|| { |
| 35 | for i in 0..N3 { |
| 36 | for j in (i + 1)..N3 { |
| 37 | for k in (j + 1)..N3 { |
| 38 | black_box(i + j + k); |
| 39 | } |
| 40 | } |
| 41 | } |
| 42 | }) |
| 43 | }); |
| 44 | } |
| 45 | |
| 46 | fn comb_for4(c: &mut Criterion) { |
| 47 | c.bench_function("comb for4", move |b| { |
| 48 | b.iter(|| { |
| 49 | for i in 0..N4 { |
| 50 | for j in (i + 1)..N4 { |
| 51 | for k in (j + 1)..N4 { |
| 52 | for l in (k + 1)..N4 { |
| 53 | black_box(i + j + k + l); |
| 54 | } |
| 55 | } |
| 56 | } |
| 57 | } |
| 58 | }) |
| 59 | }); |
| 60 | } |
| 61 | |
| 62 | fn comb_c1(c: &mut Criterion) { |
| 63 | c.bench_function("comb c1", move |b| { |
| 64 | b.iter(|| { |
| 65 | for (i,) in (0..N1).tuple_combinations() { |
| 66 | black_box(i); |
| 67 | } |
| 68 | }) |
| 69 | }); |
| 70 | } |
| 71 | |
| 72 | fn comb_c2(c: &mut Criterion) { |
| 73 | c.bench_function("comb c2", move |b| { |
| 74 | b.iter(|| { |
| 75 | for (i, j) in (0..N2).tuple_combinations() { |
| 76 | black_box(i + j); |
| 77 | } |
| 78 | }) |
| 79 | }); |
| 80 | } |
| 81 | |
| 82 | fn comb_c3(c: &mut Criterion) { |
| 83 | c.bench_function("comb c3", move |b| { |
| 84 | b.iter(|| { |
| 85 | for (i, j, k) in (0..N3).tuple_combinations() { |
| 86 | black_box(i + j + k); |
| 87 | } |
| 88 | }) |
| 89 | }); |
| 90 | } |
| 91 | |
| 92 | fn comb_c4(c: &mut Criterion) { |
| 93 | c.bench_function("comb c4", move |b| { |
| 94 | b.iter(|| { |
| 95 | for (i, j, k, l) in (0..N4).tuple_combinations() { |
| 96 | black_box(i + j + k + l); |
| 97 | } |
| 98 | }) |
| 99 | }); |
| 100 | } |
| 101 | |
| 102 | criterion_group!( |
| 103 | benches, |
| 104 | comb_for1, |
| 105 | comb_for2, |
| 106 | comb_for3, |
| 107 | comb_for4, |
| 108 | comb_c1, |
| 109 | comb_c2, |
| 110 | comb_c3, |
| 111 | comb_c4, |
| 112 | ); |
| 113 | criterion_main!(benches); |