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#![feature(test)]
extern crate test;
use test::Bencher;
use ndarray::prelude::*;
use ndarray::NdProducer;
#[bench]
fn chunk2x2_iter_sum(bench: &mut Bencher)
{
let a = Array::<f32, _>::zeros((256, 256));
let chunksz = (2, 2);
let mut sum = Array::zeros(a.exact_chunks(chunksz).raw_dim());
bench.iter(|| {
azip!((a in a.exact_chunks(chunksz), sum in &mut sum) {
*sum = a.iter().sum::<f32>();
});
});
}
#[bench]
fn chunk2x2_sum(bench: &mut Bencher)
{
let a = Array::<f32, _>::zeros((256, 256));
let chunksz = (2, 2);
let mut sum = Array::zeros(a.exact_chunks(chunksz).raw_dim());
bench.iter(|| {
azip!((a in a.exact_chunks(chunksz), sum in &mut sum) {
*sum = a.sum();
});
});
}
#[bench]
fn chunk2x2_sum_get1(bench: &mut Bencher)
{
let a = Array::<f32, _>::zeros((256, 256));
let chunksz = (2, 2);
let mut sum = Array::<f32, _>::zeros(a.exact_chunks(chunksz).raw_dim());
bench.iter(|| {
let (m, n) = a.dim();
for i in 0..m {
for j in 0..n {
sum[[i / 2, j / 2]] += a[[i, j]];
}
}
});
}
#[bench]
fn chunk2x2_sum_uget1(bench: &mut Bencher)
{
let a = Array::<f32, _>::zeros((256, 256));
let chunksz = (2, 2);
let mut sum = Array::<f32, _>::zeros(a.exact_chunks(chunksz).raw_dim());
bench.iter(|| {
let (m, n) = a.dim();
for i in 0..m {
for j in 0..n {
unsafe {
*sum.uget_mut([i / 2, j / 2]) += *a.uget([i, j]);
}
}
}
});
}
#[bench]
#[allow(clippy::identity_op)]
fn chunk2x2_sum_get2(bench: &mut Bencher)
{
let a = Array::<f32, _>::zeros((256, 256));
let chunksz = (2, 2);
let mut sum = Array::<f32, _>::zeros(a.exact_chunks(chunksz).raw_dim());
bench.iter(|| {
let (m, n) = sum.dim();
for i in 0..m {
for j in 0..n {
sum[[i, j]] += a[[i * 2 + 0, j * 2 + 0]];
sum[[i, j]] += a[[i * 2 + 0, j * 2 + 1]];
sum[[i, j]] += a[[i * 2 + 1, j * 2 + 1]];
sum[[i, j]] += a[[i * 2 + 1, j * 2 + 0]];
}
}
});
}
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