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iter_map_collect.rs
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iter_map_collect.rs
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use criterion::{black_box, criterion_group, criterion_main, BenchmarkId, Criterion};
use orx_parallel::prelude::*;
use rand::prelude::*;
use rand_chacha::ChaCha8Rng;
use rayon::iter::{IntoParallelIterator, ParallelBridge};
const NUM_NUMBERS: usize = 4;
const NUM_VECTORS: usize = 4;
const LEN_VECTORS: usize = 4;
const SEED: u64 = 5426;
const FIB_UPPER_BOUND: u32 = 999;
#[derive(Debug, PartialEq, Eq, PartialOrd, Ord)]
struct LargeOutput {
name: String,
numbers: [i64; NUM_NUMBERS],
vectors: Vec<Vec<i64>>,
}
fn to_large_output(idx: usize) -> LargeOutput {
let prefix = match idx % 7 {
0 => "zero-",
3 => "three-",
_ => "sth-",
};
let fib = fibonacci(&(idx as u32));
let name = format!("{}-fib-{}", prefix, fib);
let mut numbers = [0i64; NUM_NUMBERS];
for (i, x) in numbers.iter_mut().enumerate() {
*x = match (idx * 7 + i) % 3 {
0 => idx as i64 + i as i64,
_ => idx as i64 - i as i64,
};
}
let mut vectors = vec![];
for i in 0..NUM_VECTORS {
let mut vec = vec![];
for j in 0..(idx % LEN_VECTORS) {
vec.push(idx as i64 - i as i64 + j as i64);
}
vectors.push(vec);
}
LargeOutput {
name,
numbers,
vectors,
}
}
fn fibonacci(n: &u32) -> u32 {
let mut a = 0;
let mut b = 1;
for _ in 0..*n {
let c = a + b;
a = b;
b = c;
}
a
}
fn inputs(len: usize) -> Vec<usize> {
let mut rng = ChaCha8Rng::seed_from_u64(SEED);
(0..len)
.map(|_| rng.gen_range(0..FIB_UPPER_BOUND) as usize)
.collect()
}
fn seq(inputs: &[usize]) -> Vec<LargeOutput> {
inputs
.iter()
.filter(|x| *x % 3 > 0)
.map(|x| x + 1)
.map(to_large_output)
.collect()
}
fn rayon(inputs: &[usize]) -> Vec<LargeOutput> {
use rayon::iter::ParallelIterator;
inputs
.iter()
.filter(|x| *x % 3 > 0)
.map(|x| x + 1)
.par_bridge()
.into_par_iter()
.map(to_large_output)
.collect()
}
fn orx_parallel_vec(inputs: &[usize]) -> Vec<LargeOutput> {
inputs
.iter()
.filter(|x| *x % 3 > 0)
.map(|x| x + 1)
.par()
.chunk_size(64)
.map(to_large_output)
.collect_x()
.into_iter()
.collect()
}
fn orx_parallel_split_vec(inputs: &[usize]) -> SplitVec<LargeOutput, Recursive> {
inputs
.iter()
.filter(|x| *x % 3 > 0)
.map(|x| x + 1)
.par()
.chunk_size(64)
.map(to_large_output)
.collect_x()
}
fn orx_parallel(
inputs: &[usize],
num_threads: usize,
chunk_size: usize,
) -> SplitVec<LargeOutput, Recursive> {
inputs
.iter()
.filter(|x| *x % 3 > 0)
.map(|x| x + 1)
.par()
.chunk_size(chunk_size)
.num_threads(num_threads)
.map(to_large_output)
.collect_x()
}
fn validate(expected: &[LargeOutput], mut output: Vec<LargeOutput>) {
output.sort();
assert_eq!(expected.len(), output.len());
assert_eq!(expected, output);
}
fn iter_map_collect(c: &mut Criterion) {
let treatments = [65_536, 65_536 * 4];
let _params = [(1, 1), (32, 1024)];
let params = [];
let mut group = c.benchmark_group("iter_map_collect");
for n in &treatments {
let input = inputs(*n);
let mut expected = seq(&input);
expected.sort();
group.bench_with_input(BenchmarkId::new("seq", n), n, |b, _| {
validate(&expected, seq(&input));
b.iter(|| seq(black_box(&input)))
});
group.bench_with_input(BenchmarkId::new("rayon", n), n, |b, _| {
validate(&expected, rayon(&input));
b.iter(|| rayon(black_box(&input)))
});
group.bench_with_input(BenchmarkId::new("orx-parallel-split-vec", n), n, |b, _| {
validate(&expected, orx_parallel_split_vec(&input).to_vec());
b.iter(|| orx_parallel_split_vec(black_box(&input)))
});
group.bench_with_input(BenchmarkId::new("orx-parallel-vec", n), n, |b, _| {
validate(&expected, orx_parallel_vec(&input));
b.iter(|| orx_parallel_vec(black_box(&input)))
});
for (t, c) in params {
let name = format!("orx-parallel-t{}-c{}", t, c);
group.bench_with_input(BenchmarkId::new(name, n), n, |b, _| {
validate(&expected, orx_parallel(&input, t, c).to_vec());
b.iter(|| orx_parallel(black_box(&input), t, c))
});
}
}
group.finish();
}
criterion_group!(benches, iter_map_collect);
criterion_main!(benches);