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#![cfg(feature = "rayon")]
#![feature(test)]
use ndarray::parallel::prelude::*;
use ndarray::prelude::*;
extern crate test;
use test::Bencher;
use ndarray::Zip;
const EXP_N: usize = 256;
const ADDN: usize = 512;
fn set_threads()
{
// Consider setting a fixed number of threads here, for example to avoid
// oversubscribing on hyperthreaded cores.
// let n = 4;
// let _ = rayon::ThreadPoolBuilder::new().num_threads(n).build_global();
}
#[bench]
fn map_exp_regular(bench: &mut Bencher)
{
let mut a = Array2::<f64>::zeros((EXP_N, EXP_N));
a.swap_axes(0, 1);
bench.iter(|| {
a.mapv_inplace(|x| x.exp());
});
}
#[bench]
fn rayon_exp_regular(bench: &mut Bencher)
{
set_threads();
let mut a = Array2::<f64>::zeros((EXP_N, EXP_N));
a.swap_axes(0, 1);
bench.iter(|| {
a.view_mut().into_par_iter().for_each(|x| *x = x.exp());
});
}
const FASTEXP: usize = EXP_N;
#[inline]
fn fastexp(x: f64) -> f64
{
let x = 1. + x / 1024.;
x.powi(1024)
}
#[bench]
fn map_fastexp_regular(bench: &mut Bencher)
{
let mut a = Array2::<f64>::zeros((FASTEXP, FASTEXP));
bench.iter(|| a.mapv_inplace(|x| fastexp(x)));
}
#[bench]
fn rayon_fastexp_regular(bench: &mut Bencher)
{
set_threads();
let mut a = Array2::<f64>::zeros((FASTEXP, FASTEXP));
bench.iter(|| {
a.view_mut().into_par_iter().for_each(|x| *x = fastexp(*x));
});
}
#[bench]
fn map_fastexp_cut(bench: &mut Bencher)
{
let mut a = Array2::<f64>::zeros((FASTEXP, FASTEXP));
let mut a = a.slice_mut(s![.., ..-1]);
bench.iter(|| a.mapv_inplace(|x| fastexp(x)));
}
#[bench]
fn rayon_fastexp_cut(bench: &mut Bencher)
{
set_threads();
let mut a = Array2::<f64>::zeros((FASTEXP, FASTEXP));
let mut a = a.slice_mut(s![.., ..-1]);
bench.iter(|| {
a.view_mut().into_par_iter().for_each(|x| *x = fastexp(*x));
});
}
#[bench]
fn map_fastexp_by_axis(bench: &mut Bencher)
{
let mut a = Array2::<f64>::zeros((FASTEXP, FASTEXP));
bench.iter(|| {
for mut sheet in a.axis_iter_mut(Axis(0)) {
sheet.mapv_inplace(fastexp)
}
});
}
#[bench]
fn rayon_fastexp_by_axis(bench: &mut Bencher)
{
set_threads();
let mut a = Array2::<f64>::zeros((FASTEXP, FASTEXP));
bench.iter(|| {
a.axis_iter_mut(Axis(0))
.into_par_iter()
.for_each(|mut sheet| sheet.mapv_inplace(fastexp));
});
}
#[bench]
fn rayon_fastexp_zip(bench: &mut Bencher)
{
set_threads();
let mut a = Array2::<f64>::zeros((FASTEXP, FASTEXP));
bench.iter(|| {
Zip::from(&mut a)
.into_par_iter()
.for_each(|(elt,)| *elt = fastexp(*elt));
});
}
#[bench]
fn add(bench: &mut Bencher)
{
let mut a = Array2::<f64>::zeros((ADDN, ADDN));
let b = Array2::<f64>::zeros((ADDN, ADDN));
let c = Array2::<f64>::zeros((ADDN, ADDN));
let d = Array2::<f64>::zeros((ADDN, ADDN));
bench.iter(|| {
azip!((a in &mut a, &b in &b, &c in &c, &d in &d) {
*a += b.exp() + c.exp() + d.exp();
});
});
}
#[bench]
fn rayon_add(bench: &mut Bencher)
{
set_threads();
let mut a = Array2::<f64>::zeros((ADDN, ADDN));
let b = Array2::<f64>::zeros((ADDN, ADDN));
let c = Array2::<f64>::zeros((ADDN, ADDN));
let d = Array2::<f64>::zeros((ADDN, ADDN));
bench.iter(|| {
par_azip!((a in &mut a, b in &b, c in &c, d in &d) {
*a += b.exp() + c.exp() + d.exp();
});
});
}
const COLL_STRING_N: usize = 64;
const COLL_F64_N: usize = 128;
#[bench]
fn vec_string_collect(bench: &mut test::Bencher)
{
let v = vec![""; COLL_STRING_N * COLL_STRING_N];
bench.iter(|| v.iter().map(|s| s.to_owned()).collect::<Vec<_>>());
}
#[bench]
fn array_string_collect(bench: &mut test::Bencher)
{
let v = Array::from_elem((COLL_STRING_N, COLL_STRING_N), "");
bench.iter(|| Zip::from(&v).par_map_collect(|s| s.to_owned()));
}
#[bench]
fn vec_f64_collect(bench: &mut test::Bencher)
{
let v = vec![1.; COLL_F64_N * COLL_F64_N];
bench.iter(|| v.iter().map(|s| s + 1.).collect::<Vec<_>>());
}
#[bench]
fn array_f64_collect(bench: &mut test::Bencher)
{
let v = Array::from_elem((COLL_F64_N, COLL_F64_N), 1.);
bench.iter(|| Zip::from(&v).par_map_collect(|s| s + 1.));
}
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