2019-08-14 15:57:14 +02:00
|
|
|
// Copyright 2019 Developers of the Rand project.
|
|
|
|
//
|
|
|
|
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
|
|
|
|
// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
|
|
|
|
// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
|
|
|
|
// option. This file may not be copied, modified, or distributed
|
|
|
|
// except according to those terms.
|
|
|
|
|
|
|
|
#![feature(test)]
|
|
|
|
|
|
|
|
extern crate test;
|
|
|
|
|
|
|
|
use rand::distributions::WeightedIndex;
|
2020-01-01 18:01:48 +00:00
|
|
|
use rand::Rng;
|
|
|
|
use test::Bencher;
|
2019-08-14 15:57:14 +02:00
|
|
|
|
|
|
|
#[bench]
|
|
|
|
fn weighted_index_creation(b: &mut Bencher) {
|
|
|
|
let mut rng = rand::thread_rng();
|
2019-08-15 18:24:00 +02:00
|
|
|
let weights = [1u32, 2, 4, 0, 5, 1, 7, 1, 2, 3, 4, 5, 6, 7];
|
2019-08-14 15:57:14 +02:00
|
|
|
b.iter(|| {
|
|
|
|
let distr = WeightedIndex::new(weights.to_vec()).unwrap();
|
|
|
|
rng.sample(distr)
|
|
|
|
})
|
|
|
|
}
|
|
|
|
|
|
|
|
#[bench]
|
|
|
|
fn weighted_index_modification(b: &mut Bencher) {
|
|
|
|
let mut rng = rand::thread_rng();
|
|
|
|
let weights = [1u32, 2, 3, 0, 5, 6, 7, 1, 2, 3, 4, 5, 6, 7];
|
|
|
|
let mut distr = WeightedIndex::new(weights.to_vec()).unwrap();
|
|
|
|
b.iter(|| {
|
|
|
|
distr.update_weights(&[(2, &4), (5, &1)]).unwrap();
|
|
|
|
rng.sample(&distr)
|
|
|
|
})
|
|
|
|
}
|