Joel Galenson | 6f79871 | 2021-04-01 17:03:06 -0700 | [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 | const N14: usize = 21; |
| 10 | |
| 11 | fn comb_for1(c: &mut Criterion) { |
| 12 | c.bench_function("comb for1", move |b| { |
| 13 | b.iter(|| { |
| 14 | for i in 0..N1 { |
| 15 | black_box(vec![i]); |
| 16 | } |
| 17 | }) |
| 18 | }); |
| 19 | } |
| 20 | |
| 21 | fn comb_for2(c: &mut Criterion) { |
| 22 | c.bench_function("comb for2", move |b| { |
| 23 | b.iter(|| { |
| 24 | for i in 0..N2 { |
| 25 | for j in (i + 1)..N2 { |
| 26 | black_box(vec![i, j]); |
| 27 | } |
| 28 | } |
| 29 | }) |
| 30 | }); |
| 31 | } |
| 32 | |
| 33 | fn comb_for3(c: &mut Criterion) { |
| 34 | c.bench_function("comb for3", move |b| { |
| 35 | b.iter(|| { |
| 36 | for i in 0..N3 { |
| 37 | for j in (i + 1)..N3 { |
| 38 | for k in (j + 1)..N3 { |
| 39 | black_box(vec![i, j, k]); |
| 40 | } |
| 41 | } |
| 42 | } |
| 43 | }) |
| 44 | }); |
| 45 | } |
| 46 | |
| 47 | fn comb_for4(c: &mut Criterion) { |
| 48 | c.bench_function("comb for4", move |b| { |
| 49 | b.iter(|| { |
| 50 | for i in 0..N4 { |
| 51 | for j in (i + 1)..N4 { |
| 52 | for k in (j + 1)..N4 { |
| 53 | for l in (k + 1)..N4 { |
| 54 | black_box(vec![i, j, k, l]); |
| 55 | } |
| 56 | } |
| 57 | } |
| 58 | } |
| 59 | }) |
| 60 | }); |
| 61 | } |
| 62 | |
| 63 | fn comb_c1(c: &mut Criterion) { |
| 64 | c.bench_function("comb c1", move |b| { |
| 65 | b.iter(|| { |
| 66 | for combo in (0..N1).combinations(1) { |
| 67 | black_box(combo); |
| 68 | } |
| 69 | }) |
| 70 | }); |
| 71 | } |
| 72 | |
| 73 | fn comb_c2(c: &mut Criterion) { |
| 74 | c.bench_function("comb c2", move |b| { |
| 75 | b.iter(|| { |
| 76 | for combo in (0..N2).combinations(2) { |
| 77 | black_box(combo); |
| 78 | } |
| 79 | }) |
| 80 | }); |
| 81 | } |
| 82 | |
| 83 | fn comb_c3(c: &mut Criterion) { |
| 84 | c.bench_function("comb c3", move |b| { |
| 85 | b.iter(|| { |
| 86 | for combo in (0..N3).combinations(3) { |
| 87 | black_box(combo); |
| 88 | } |
| 89 | }) |
| 90 | }); |
| 91 | } |
| 92 | |
| 93 | fn comb_c4(c: &mut Criterion) { |
| 94 | c.bench_function("comb c4", move |b| { |
| 95 | b.iter(|| { |
| 96 | for combo in (0..N4).combinations(4) { |
| 97 | black_box(combo); |
| 98 | } |
| 99 | }) |
| 100 | }); |
| 101 | } |
| 102 | |
| 103 | fn comb_c14(c: &mut Criterion) { |
| 104 | c.bench_function("comb c14", move |b| { |
| 105 | b.iter(|| { |
| 106 | for combo in (0..N14).combinations(14) { |
| 107 | black_box(combo); |
| 108 | } |
| 109 | }) |
| 110 | }); |
| 111 | } |
| 112 | |
| 113 | criterion_group!( |
| 114 | benches, |
| 115 | comb_for1, |
| 116 | comb_for2, |
| 117 | comb_for3, |
| 118 | comb_for4, |
| 119 | comb_c1, |
| 120 | comb_c2, |
| 121 | comb_c3, |
| 122 | comb_c4, |
| 123 | comb_c14, |
| 124 | ); |
| 125 | criterion_main!(benches); |