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// Copyright 2018 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;
const RAND_BENCH_N: u64 = 1000;
use test::Bencher;
use rand::prelude::*;
use rand::distributions::{Distribution, Standard, Bernoulli};
use rand_pcg::{Pcg32, Pcg64Mcg};
#[bench]
fn misc_gen_bool_const(b: &mut Bencher) {
let mut rng = Pcg32::from_rng(&mut thread_rng()).unwrap();
b.iter(|| {
let mut accum = true;
for _ in 0..crate::RAND_BENCH_N {
accum ^= rng.gen_bool(0.18);
}
accum
})
}
#[bench]
fn misc_gen_bool_var(b: &mut Bencher) {
let mut rng = Pcg32::from_rng(&mut thread_rng()).unwrap();
b.iter(|| {
let mut accum = true;
let mut p = 0.18;
for _ in 0..crate::RAND_BENCH_N {
accum ^= rng.gen_bool(p);
p += 0.0001;
}
accum
})
}
#[bench]
fn misc_gen_ratio_const(b: &mut Bencher) {
let mut rng = Pcg32::from_rng(&mut thread_rng()).unwrap();
b.iter(|| {
let mut accum = true;
for _ in 0..crate::RAND_BENCH_N {
accum ^= rng.gen_ratio(2, 3);
}
accum
})
}
#[bench]
fn misc_gen_ratio_var(b: &mut Bencher) {
let mut rng = Pcg32::from_rng(&mut thread_rng()).unwrap();
b.iter(|| {
let mut accum = true;
for i in 2..(crate::RAND_BENCH_N as u32 + 2) {
accum ^= rng.gen_ratio(i, i + 1);
}
accum
})
}
#[bench]
fn misc_bernoulli_const(b: &mut Bencher) {
let mut rng = Pcg32::from_rng(&mut thread_rng()).unwrap();
b.iter(|| {
let d = rand::distributions::Bernoulli::new(0.18).unwrap();
let mut accum = true;
for _ in 0..crate::RAND_BENCH_N {
accum ^= rng.sample(d);
}
accum
})
}
#[bench]
fn misc_bernoulli_var(b: &mut Bencher) {
let mut rng = Pcg32::from_rng(&mut thread_rng()).unwrap();
b.iter(|| {
let mut accum = true;
let mut p = 0.18;
for _ in 0..crate::RAND_BENCH_N {
let d = Bernoulli::new(p).unwrap();
accum ^= rng.sample(d);
p += 0.0001;
}
accum
})
}
#[bench]
fn gen_1k_iter_repeat(b: &mut Bencher) {
use std::iter;
let mut rng = Pcg64Mcg::from_rng(&mut thread_rng()).unwrap();
b.iter(|| {
let v: Vec<u64> = iter::repeat(()).map(|()| rng.gen()).take(128).collect();
v
});
b.bytes = 1024;
}
#[bench]
fn gen_1k_sample_iter(b: &mut Bencher) {
let mut rng = Pcg64Mcg::from_rng(&mut thread_rng()).unwrap();
b.iter(|| {
let v: Vec<u64> = Standard.sample_iter(&mut rng).take(128).collect();
v
});
b.bytes = 1024;
}
#[bench]
fn gen_1k_gen_array(b: &mut Bencher) {
let mut rng = Pcg64Mcg::from_rng(&mut thread_rng()).unwrap();
b.iter(|| {
// max supported array length is 32!
let v: [[u64; 32]; 4] = rng.gen();
v
});
b.bytes = 1024;
}
#[bench]
fn gen_1k_fill(b: &mut Bencher) {
let mut rng = Pcg64Mcg::from_rng(&mut thread_rng()).unwrap();
let mut buf = [0u64; 128];
b.iter(|| {
rng.fill(&mut buf[..]);
buf
});
b.bytes = 1024;
}
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