src/developer/fuchsia-criterion/examples/main.rs

// Copyright 2019 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

use fuchsia_criterion::{criterion, FuchsiaCriterion};
use std::time::Duration;

fn fibonacci(n: u64) -> u64 {
    match n {
        0 => 1,
        1 => 1,
        n => fibonacci(n - 1) + fibonacci(n - 2),
    }
}

fn main() {
    let mut c = FuchsiaCriterion::default();
    // Override the default benchmark parameters.
    let internal_c: &mut criterion::Criterion = &mut c;
    *internal_c = std::mem::take(internal_c)
        .warm_up_time(Duration::from_millis(1))
        .measurement_time(Duration::from_millis(100))
        .sample_size(100);

    c.bench_function("fib 10", |b| b.iter(|| fibonacci(criterion::black_box(10))));
}