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use criterion::*;
#[derive(Default)]
struct Small(u8);
#[derive(Default)]
struct Big([usize; 32]);
fn alloc<T: Default>(n: usize) {
let arena = bumpalo::Bump::with_capacity(n * std::mem::size_of::<T>());
for _ in 0..n {
let arena = black_box(&arena);
let val: &mut T = arena.alloc(black_box(Default::default()));
black_box(val);
}
}
fn alloc_with<T: Default>(n: usize) {
let arena = bumpalo::Bump::with_capacity(n * std::mem::size_of::<T>());
for _ in 0..n {
let arena = black_box(&arena);
let val: &mut T = arena.alloc_with(|| black_box(Default::default()));
black_box(val);
}
}
#[cfg(feature = "collections")]
fn format_realloc(bump: &bumpalo::Bump, n: usize) {
let n = criterion::black_box(n);
let s = bumpalo::format!(in bump, "Hello {:.*}", n, "World! ");
criterion::black_box(s);
}
const ALLOCATIONS: usize = 10_000;
fn bench_alloc(c: &mut Criterion) {
let mut group = c.benchmark_group("alloc");
group.throughput(Throughput::Elements(ALLOCATIONS as u64));
group.bench_function("small", |b| b.iter(|| alloc::<Small>(ALLOCATIONS)));
group.bench_function("big", |b| b.iter(|| alloc::<Big>(ALLOCATIONS)));
}
fn bench_alloc_with(c: &mut Criterion) {
let mut group = c.benchmark_group("alloc-with");
group.throughput(Throughput::Elements(ALLOCATIONS as u64));
group.bench_function("small", |b| b.iter(|| alloc_with::<Small>(ALLOCATIONS)));
group.bench_function("big", |b| b.iter(|| alloc_with::<Big>(ALLOCATIONS)));
}
fn bench_format_realloc(c: &mut Criterion) {
let mut group = c.benchmark_group("format-realloc");
for n in (1..5).map(|n| n * n * n * 10) {
group.throughput(Throughput::Elements(n as u64));
group.bench_with_input(BenchmarkId::new("format-realloc", n), &n, |b, n| {
let mut bump = bumpalo::Bump::new();
b.iter(|| {
bump.reset();
format_realloc(&bump, *n);
});
});
}
}
criterion_group!(benches, bench_alloc, bench_alloc_with, bench_format_realloc);
criterion_main!(benches);
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