Vector Add Benchmarks

vector-add-benchmarks.rs

#![feature(test)]

extern crate test;
#[macro_use] extern crate itertools;

use test::Bencher;

const VEC_SIZE: usize = 10000;

#[bench]
fn bench_vector_add(bencher: &mut Bencher) {
    let a = vec![0f64; VEC_SIZE];
    let b = vec![0f64; VEC_SIZE];

    let mut c = vec![0f64; VEC_SIZE];

    bencher.iter(|| {
        for x in 0..VEC_SIZE {
            c[x] = a[x] + b[x];
        }
    });
}

#[bench]
fn bench_vector_add_slice(bencher: &mut Bencher) {
    let a = vec![0f64; VEC_SIZE];
    let b = vec![0f64; VEC_SIZE];

    let mut c = vec![0f64; VEC_SIZE];

    bencher.iter(|| {
        let a = &a[0..VEC_SIZE];
        let b = &b[0..VEC_SIZE];

        let c = &mut c[0..VEC_SIZE];

        for x in 0..VEC_SIZE {
            c[x] = a[x] + b[x];
        }
    });
}

#[bench]
fn bench_vector_add_unsafe(bencher: &mut Bencher) {
    let a = vec![0f64; VEC_SIZE];
    let b = vec![0f64; VEC_SIZE];

    let mut c = vec![0f64; VEC_SIZE];

    bencher.iter(|| {
        for x in 0..VEC_SIZE {
            unsafe {
                *c.get_unchecked_mut(x) = *a.get_unchecked(x) + *b.get_unchecked(x);
            }
        }
    });
}

#[bench]
fn bench_vector_add_zip(bencher: &mut Bencher) {
    let a = vec![0f64; VEC_SIZE];
    let b = vec![0f64; VEC_SIZE];

    let mut c = vec![0f64; VEC_SIZE];

    bencher.iter(|| {
        for (&a, &b, c) in izip!(&a, &b, &mut c) {
            *c = a + b;
        }
    });
}

#[bench]
fn bench_vector_add_zip_collect(bencher: &mut Bencher) {
    let a = vec![0f64; VEC_SIZE];
    let b = vec![0f64; VEC_SIZE];

    bencher.iter(|| {
        let _c: Vec<f64> = a.iter().zip(&b).map(|(a, b)| a + b).collect();
    });
}