dyn-stack 0.13.2

Dynamic stack wrapper for unsized allocations
Documentation 
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use criterion::{Criterion, black_box, criterion_group, criterion_main};
use dyn_stack::{MemBuffer, MemStack, PodBuffer, PodStack, StackReq};

pub fn criterion_benchmark(c: &mut Criterion) {
	c.bench_function("memalloc", |b| {
		b.iter(|| black_box(MemBuffer::new(StackReq::new_aligned::<i32>(1 << 20, 16))))
	});
	c.bench_function("memalloc-zeroed", |b| {
		b.iter(|| black_box(PodBuffer::new(StackReq::new_aligned::<i32>(1 << 20, 16))))
	});

	for n in [32, 64, 1024, 16384] {
		let align = 64;
		let single_scratch = StackReq::new_aligned::<f32>(n, align);
		let scratch = single_scratch.and(single_scratch);

		let mut mem = MemBuffer::new(scratch);
		let stack = MemStack::new(&mut *mem);

		{
			let (src, stack) = stack.make_aligned_with(n, align, |_| 0.0_f32);
			let (mut dst, _) = stack.make_aligned_with(n, align, |_| 0.0_f32);
			c.bench_function(&format!("preallocated-{}", n), |b| {
				b.iter(|| {
					for (d, s) in dst.iter_mut().zip(src.iter()) {
						*d = s + s;
					}
					black_box(&mut dst);
				})
			});
		}

		{
			let (src, stack) = stack.make_aligned_with(n, align, |_| 0.0_f32);
			c.bench_function(&format!("allocate-on-demand-init-{}", n), |b| {
				b.iter(|| {
					let (mut dst, _) = stack.make_aligned_with(n, align, |_| 0.0_f32);
					for (d, s) in dst.iter_mut().zip(src.iter()) {
						*d = s + s;
					}
					black_box(&mut dst);
				})
			});
		}

		{
			let (src, stack) = stack.make_aligned_with(n, align, |_| 0.0_f32);
			c.bench_function(&format!("allocate-on-demand-uninit-{}", n), |b| {
				b.iter(|| {
					let (mut dst, _) = stack.make_aligned_uninit::<f32>(n, align);
					for (d, s) in dst.iter_mut().zip(src.iter()) {
						d.write(s + s);
					}
					black_box(&mut dst);
				})
			});
		}

		{
			let (src, stack) = stack.make_aligned_with(n, align, |_| 0.0_f32);
			c.bench_function(&format!("allocate-on-demand-collect-{}", n), |b| {
				b.iter(|| {
					let (mut dst, _) = stack.collect_aligned(align, src.iter().zip(src.iter()).map(|(a, b)| a + b));
					black_box(&mut dst);
				})
			});
		}
	}

	for n in [32, 64, 1024, 16384] {
		let align = 64;
		let single_scratch = StackReq::new_aligned::<f32>(n, align);
		let scratch = single_scratch.and(single_scratch);

		let mut mem = PodBuffer::new(scratch);
		let stack = PodStack::new(&mut *mem);

		{
			let (src, stack) = stack.make_aligned_with(n, align, |_| 0.0_f32);
			let (mut dst, _) = stack.make_aligned_with(n, align, |_| 0.0_f32);
			c.bench_function(&format!("pod-preallocated-{}", n), |b| {
				b.iter(|| {
					for (d, s) in dst.iter_mut().zip(src.iter()) {
						*d = s + s;
					}
					black_box(&mut dst);
				})
			});
		}

		{
			let (src, stack) = stack.make_aligned_with(n, align, |_| 0.0_f32);
			c.bench_function(&format!("pod-allocate-on-demand-init-{}", n), |b| {
				b.iter(|| {
					let (mut dst, _) = stack.make_aligned_with(n, align, |_| 0.0_f32);
					for (d, s) in dst.iter_mut().zip(src.iter()) {
						*d = s + s;
					}
					black_box(&mut dst);
				})
			});
		}

		{
			let (src, stack) = stack.make_aligned_with(n, align, |_| 0.0_f32);
			c.bench_function(&format!("pod-allocate-on-demand-uninit-{}", n), |b| {
				b.iter(|| {
					let (mut dst, _) = stack.make_aligned_raw::<f32>(n, align);
					for (d, s) in dst.iter_mut().zip(src.iter()) {
						*d = s + s;
					}
					black_box(&mut dst);
				})
			});
		}

		{
			let (src, stack) = stack.make_aligned_with(n, align, |_| 0.0_f32);
			c.bench_function(&format!("pod-allocate-on-demand-collect-{}", n), |b| {
				b.iter(|| {
					let (mut dst, _) = stack.collect_aligned(align, src.iter().zip(src.iter()).map(|(a, b)| a + b));
					black_box(&mut dst);
				})
			});
		}
	}
}

criterion_group!(benches, criterion_benchmark);
criterion_main!(benches);