47 lines
1.2 KiB
Rust
Executable File
47 lines
1.2 KiB
Rust
Executable File
use criterion::{criterion_group, BenchmarkId, Criterion};
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fn fibonacci_slow(n: u64) -> u64 {
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match n {
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0 | 1 => 1,
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n => fibonacci_slow(n - 1) + fibonacci_slow(n - 2),
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}
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}
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fn fibonacci_fast(n: u64) -> u64 {
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let mut a = 0;
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let mut b = 1;
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match n {
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0 => b,
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_ => {
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for _ in 0..n {
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let c = a + b;
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a = b;
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b = c;
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}
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b
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}
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}
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}
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fn compare_fibonaccis(c: &mut Criterion) {
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let mut group = c.benchmark_group("Fibonacci");
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group.bench_with_input("Recursive", &20, |b, i| b.iter(|| fibonacci_slow(*i)));
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group.bench_with_input("Iterative", &20, |b, i| b.iter(|| fibonacci_fast(*i)));
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}
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fn compare_fibonaccis_group(c: &mut Criterion) {
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let mut group = c.benchmark_group("Fibonacci3");
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for i in 20..=21 {
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group.bench_with_input(BenchmarkId::new("Recursive", i), &i, |b, i| {
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b.iter(|| fibonacci_slow(*i))
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});
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group.bench_with_input(BenchmarkId::new("Iterative", i), &i, |b, i| {
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b.iter(|| fibonacci_fast(*i))
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});
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}
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group.finish()
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}
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criterion_group!(fibonaccis, compare_fibonaccis, compare_fibonaccis_group,);
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