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Diffstat (limited to 'library/alloctests/benches/vec.rs')
| -rw-r--r-- | library/alloctests/benches/vec.rs | 878 |
1 files changed, 878 insertions, 0 deletions
diff --git a/library/alloctests/benches/vec.rs b/library/alloctests/benches/vec.rs new file mode 100644 index 00000000000..1dab71fa1f4 --- /dev/null +++ b/library/alloctests/benches/vec.rs @@ -0,0 +1,878 @@ +use std::iter::repeat; + +use rand::RngCore; +use test::{Bencher, black_box}; + +#[bench] +fn bench_new(b: &mut Bencher) { + b.iter(|| Vec::<u32>::new()) +} + +fn do_bench_with_capacity(b: &mut Bencher, src_len: usize) { + b.bytes = src_len as u64; + + b.iter(|| Vec::<u32>::with_capacity(src_len)) +} + +#[bench] +fn bench_with_capacity_0000(b: &mut Bencher) { + do_bench_with_capacity(b, 0) +} + +#[bench] +fn bench_with_capacity_0010(b: &mut Bencher) { + do_bench_with_capacity(b, 10) +} + +#[bench] +fn bench_with_capacity_0100(b: &mut Bencher) { + do_bench_with_capacity(b, 100) +} + +#[bench] +fn bench_with_capacity_1000(b: &mut Bencher) { + do_bench_with_capacity(b, 1000) +} + +fn do_bench_from_fn(b: &mut Bencher, src_len: usize) { + b.bytes = src_len as u64; + + b.iter(|| (0..src_len).collect::<Vec<_>>()) +} + +#[bench] +fn bench_from_fn_0000(b: &mut Bencher) { + do_bench_from_fn(b, 0) +} + +#[bench] +fn bench_from_fn_0010(b: &mut Bencher) { + do_bench_from_fn(b, 10) +} + +#[bench] +fn bench_from_fn_0100(b: &mut Bencher) { + do_bench_from_fn(b, 100) +} + +#[bench] +fn bench_from_fn_1000(b: &mut Bencher) { + do_bench_from_fn(b, 1000) +} + +fn do_bench_from_elem(b: &mut Bencher, src_len: usize) { + b.bytes = src_len as u64; + + b.iter(|| repeat(5).take(src_len).collect::<Vec<usize>>()) +} + +#[bench] +fn bench_from_elem_0000(b: &mut Bencher) { + do_bench_from_elem(b, 0) +} + +#[bench] +fn bench_from_elem_0010(b: &mut Bencher) { + do_bench_from_elem(b, 10) +} + +#[bench] +fn bench_from_elem_0100(b: &mut Bencher) { + do_bench_from_elem(b, 100) +} + +#[bench] +fn bench_from_elem_1000(b: &mut Bencher) { + do_bench_from_elem(b, 1000) +} + +fn do_bench_from_slice(b: &mut Bencher, src_len: usize) { + let src: Vec<_> = FromIterator::from_iter(0..src_len); + + b.bytes = src_len as u64; + + b.iter(|| src.as_slice().to_vec()); +} + +#[bench] +fn bench_from_slice_0000(b: &mut Bencher) { + do_bench_from_slice(b, 0) +} + +#[bench] +fn bench_from_slice_0010(b: &mut Bencher) { + do_bench_from_slice(b, 10) +} + +#[bench] +fn bench_from_slice_0100(b: &mut Bencher) { + do_bench_from_slice(b, 100) +} + +#[bench] +fn bench_from_slice_1000(b: &mut Bencher) { + do_bench_from_slice(b, 1000) +} + +fn do_bench_from_iter(b: &mut Bencher, src_len: usize) { + let src: Vec<_> = FromIterator::from_iter(0..src_len); + + b.bytes = src_len as u64; + + b.iter(|| { + let dst: Vec<_> = FromIterator::from_iter(src.iter().cloned()); + dst + }); +} + +#[bench] +fn bench_from_iter_0000(b: &mut Bencher) { + do_bench_from_iter(b, 0) +} + +#[bench] +fn bench_from_iter_0010(b: &mut Bencher) { + do_bench_from_iter(b, 10) +} + +#[bench] +fn bench_from_iter_0100(b: &mut Bencher) { + do_bench_from_iter(b, 100) +} + +#[bench] +fn bench_from_iter_1000(b: &mut Bencher) { + do_bench_from_iter(b, 1000) +} + +fn do_bench_extend(b: &mut Bencher, dst_len: usize, src_len: usize) { + let dst: Vec<_> = FromIterator::from_iter(0..dst_len); + let src: Vec<_> = FromIterator::from_iter(dst_len..dst_len + src_len); + + b.bytes = src_len as u64; + + b.iter(|| { + let mut dst = dst.clone(); + dst.extend(src.clone()); + dst + }); +} + +#[bench] +fn bench_extend_0000_0000(b: &mut Bencher) { + do_bench_extend(b, 0, 0) +} + +#[bench] +fn bench_extend_0000_0010(b: &mut Bencher) { + do_bench_extend(b, 0, 10) +} + +#[bench] +fn bench_extend_0000_0100(b: &mut Bencher) { + do_bench_extend(b, 0, 100) +} + +#[bench] +fn bench_extend_0000_1000(b: &mut Bencher) { + do_bench_extend(b, 0, 1000) +} + +#[bench] +fn bench_extend_0010_0010(b: &mut Bencher) { + do_bench_extend(b, 10, 10) +} + +#[bench] +fn bench_extend_0100_0100(b: &mut Bencher) { + do_bench_extend(b, 100, 100) +} + +#[bench] +fn bench_extend_1000_1000(b: &mut Bencher) { + do_bench_extend(b, 1000, 1000) +} + +fn do_bench_extend_from_slice(b: &mut Bencher, dst_len: usize, src_len: usize) { + let dst: Vec<_> = FromIterator::from_iter(0..dst_len); + let src: Vec<_> = FromIterator::from_iter(dst_len..dst_len + src_len); + + b.bytes = src_len as u64; + + b.iter(|| { + let mut dst = dst.clone(); + dst.extend_from_slice(&src); + dst + }); +} + +#[bench] +fn bench_extend_recycle(b: &mut Bencher) { + let mut data = vec![0; 1000]; + + b.iter(|| { + let tmp = std::mem::take(&mut data); + let mut to_extend = black_box(Vec::new()); + to_extend.extend(tmp.into_iter()); + data = black_box(to_extend); + }); + + black_box(data); +} + +#[bench] +fn bench_extend_from_slice_0000_0000(b: &mut Bencher) { + do_bench_extend_from_slice(b, 0, 0) +} + +#[bench] +fn bench_extend_from_slice_0000_0010(b: &mut Bencher) { + do_bench_extend_from_slice(b, 0, 10) +} + +#[bench] +fn bench_extend_from_slice_0000_0100(b: &mut Bencher) { + do_bench_extend_from_slice(b, 0, 100) +} + +#[bench] +fn bench_extend_from_slice_0000_1000(b: &mut Bencher) { + do_bench_extend_from_slice(b, 0, 1000) +} + +#[bench] +fn bench_extend_from_slice_0010_0010(b: &mut Bencher) { + do_bench_extend_from_slice(b, 10, 10) +} + +#[bench] +fn bench_extend_from_slice_0100_0100(b: &mut Bencher) { + do_bench_extend_from_slice(b, 100, 100) +} + +#[bench] +fn bench_extend_from_slice_1000_1000(b: &mut Bencher) { + do_bench_extend_from_slice(b, 1000, 1000) +} + +fn do_bench_clone(b: &mut Bencher, src_len: usize) { + let src: Vec<usize> = FromIterator::from_iter(0..src_len); + + b.bytes = src_len as u64; + + b.iter(|| src.clone()); +} + +#[bench] +fn bench_clone_0000(b: &mut Bencher) { + do_bench_clone(b, 0) +} + +#[bench] +fn bench_clone_0010(b: &mut Bencher) { + do_bench_clone(b, 10) +} + +#[bench] +fn bench_clone_0100(b: &mut Bencher) { + do_bench_clone(b, 100) +} + +#[bench] +fn bench_clone_1000(b: &mut Bencher) { + do_bench_clone(b, 1000) +} + +fn do_bench_clone_from(b: &mut Bencher, times: usize, dst_len: usize, src_len: usize) { + let dst: Vec<_> = FromIterator::from_iter(0..src_len); + let src: Vec<_> = FromIterator::from_iter(dst_len..dst_len + src_len); + + b.bytes = (times * src_len) as u64; + + b.iter(|| { + let mut dst = dst.clone(); + + for _ in 0..times { + dst.clone_from(&src); + dst = black_box(dst); + } + dst + }); +} + +#[bench] +fn bench_clone_from_01_0000_0000(b: &mut Bencher) { + do_bench_clone_from(b, 1, 0, 0) +} + +#[bench] +fn bench_clone_from_01_0000_0010(b: &mut Bencher) { + do_bench_clone_from(b, 1, 0, 10) +} + +#[bench] +fn bench_clone_from_01_0000_0100(b: &mut Bencher) { + do_bench_clone_from(b, 1, 0, 100) +} + +#[bench] +fn bench_clone_from_01_0000_1000(b: &mut Bencher) { + do_bench_clone_from(b, 1, 0, 1000) +} + +#[bench] +fn bench_clone_from_01_0010_0010(b: &mut Bencher) { + do_bench_clone_from(b, 1, 10, 10) +} + +#[bench] +fn bench_clone_from_01_0100_0100(b: &mut Bencher) { + do_bench_clone_from(b, 1, 100, 100) +} + +#[bench] +fn bench_clone_from_01_1000_1000(b: &mut Bencher) { + do_bench_clone_from(b, 1, 1000, 1000) +} + +#[bench] +fn bench_clone_from_01_0010_0100(b: &mut Bencher) { + do_bench_clone_from(b, 1, 10, 100) +} + +#[bench] +fn bench_clone_from_01_0100_1000(b: &mut Bencher) { + do_bench_clone_from(b, 1, 100, 1000) +} + +#[bench] +fn bench_clone_from_01_0010_0000(b: &mut Bencher) { + do_bench_clone_from(b, 1, 10, 0) +} + +#[bench] +fn bench_clone_from_01_0100_0010(b: &mut Bencher) { + do_bench_clone_from(b, 1, 100, 10) +} + +#[bench] +fn bench_clone_from_01_1000_0100(b: &mut Bencher) { + do_bench_clone_from(b, 1, 1000, 100) +} + +#[bench] +fn bench_clone_from_10_0000_0000(b: &mut Bencher) { + do_bench_clone_from(b, 10, 0, 0) +} + +#[bench] +fn bench_clone_from_10_0000_0010(b: &mut Bencher) { + do_bench_clone_from(b, 10, 0, 10) +} + +#[bench] +fn bench_clone_from_10_0000_0100(b: &mut Bencher) { + do_bench_clone_from(b, 10, 0, 100) +} + +#[bench] +fn bench_clone_from_10_0000_1000(b: &mut Bencher) { + do_bench_clone_from(b, 10, 0, 1000) +} + +#[bench] +fn bench_clone_from_10_0010_0010(b: &mut Bencher) { + do_bench_clone_from(b, 10, 10, 10) +} + +#[bench] +fn bench_clone_from_10_0100_0100(b: &mut Bencher) { + do_bench_clone_from(b, 10, 100, 100) +} + +#[bench] +fn bench_clone_from_10_1000_1000(b: &mut Bencher) { + do_bench_clone_from(b, 10, 1000, 1000) +} + +#[bench] +fn bench_clone_from_10_0010_0100(b: &mut Bencher) { + do_bench_clone_from(b, 10, 10, 100) +} + +#[bench] +fn bench_clone_from_10_0100_1000(b: &mut Bencher) { + do_bench_clone_from(b, 10, 100, 1000) +} + +#[bench] +fn bench_clone_from_10_0010_0000(b: &mut Bencher) { + do_bench_clone_from(b, 10, 10, 0) +} + +#[bench] +fn bench_clone_from_10_0100_0010(b: &mut Bencher) { + do_bench_clone_from(b, 10, 100, 10) +} + +#[bench] +fn bench_clone_from_10_1000_0100(b: &mut Bencher) { + do_bench_clone_from(b, 10, 1000, 100) +} + +macro_rules! bench_in_place { + ($($fname:ident, $type:ty, $count:expr, $init:expr);*) => { + $( + #[bench] + fn $fname(b: &mut Bencher) { + b.iter(|| { + let src: Vec<$type> = black_box(vec![$init; $count]); + src.into_iter() + .enumerate() + .map(|(idx, e)| idx as $type ^ e) + .collect::<Vec<$type>>() + }); + } + )+ + }; +} + +bench_in_place![ + bench_in_place_xxu8_0010_i0, u8, 10, 0; + bench_in_place_xxu8_0100_i0, u8, 100, 0; + bench_in_place_xxu8_1000_i0, u8, 1000, 0; + bench_in_place_xxu8_0010_i1, u8, 10, 1; + bench_in_place_xxu8_0100_i1, u8, 100, 1; + bench_in_place_xxu8_1000_i1, u8, 1000, 1; + bench_in_place_xu32_0010_i0, u32, 10, 0; + bench_in_place_xu32_0100_i0, u32, 100, 0; + bench_in_place_xu32_1000_i0, u32, 1000, 0; + bench_in_place_xu32_0010_i1, u32, 10, 1; + bench_in_place_xu32_0100_i1, u32, 100, 1; + bench_in_place_xu32_1000_i1, u32, 1000, 1; + bench_in_place_u128_0010_i0, u128, 10, 0; + bench_in_place_u128_0100_i0, u128, 100, 0; + bench_in_place_u128_1000_i0, u128, 1000, 0; + bench_in_place_u128_0010_i1, u128, 10, 1; + bench_in_place_u128_0100_i1, u128, 100, 1; + bench_in_place_u128_1000_i1, u128, 1000, 1 +]; + +#[bench] +fn bench_in_place_recycle(b: &mut Bencher) { + let mut data = vec![0; 1000]; + + b.iter(|| { + let tmp = std::mem::take(&mut data); + data = black_box( + tmp.into_iter() + .enumerate() + .map(|(idx, e)| idx.wrapping_add(e)) + .fuse() + .collect::<Vec<usize>>(), + ); + }); +} + +#[bench] +fn bench_in_place_zip_recycle(b: &mut Bencher) { + let mut data = vec![0u8; 1000]; + let mut rng = crate::bench_rng(); + let mut subst = vec![0u8; 1000]; + rng.fill_bytes(&mut subst[..]); + + b.iter(|| { + let tmp = std::mem::take(&mut data); + let mangled = tmp + .into_iter() + .zip(subst.iter().copied()) + .enumerate() + .map(|(i, (d, s))| d.wrapping_add(i as u8) ^ s) + .collect::<Vec<_>>(); + data = black_box(mangled); + }); +} + +#[bench] +fn bench_in_place_zip_iter_mut(b: &mut Bencher) { + let mut data = vec![0u8; 256]; + let mut rng = crate::bench_rng(); + let mut subst = vec![0u8; 1000]; + rng.fill_bytes(&mut subst[..]); + + b.iter(|| { + data.iter_mut().enumerate().for_each(|(i, d)| { + *d = d.wrapping_add(i as u8) ^ subst[i]; + }); + }); + + black_box(data); +} + +pub fn vec_cast<T, U>(input: Vec<T>) -> Vec<U> { + input.into_iter().map(|e| unsafe { std::mem::transmute_copy(&e) }).collect() +} + +#[bench] +fn bench_transmute(b: &mut Bencher) { + let mut vec = vec![10u32; 100]; + b.bytes = 800; // 2 casts x 4 bytes x 100 + b.iter(|| { + let v = std::mem::take(&mut vec); + let v = black_box(vec_cast::<u32, i32>(v)); + let v = black_box(vec_cast::<i32, u32>(v)); + vec = v; + }); +} + +#[derive(Clone)] +struct Droppable(usize); + +impl Drop for Droppable { + fn drop(&mut self) { + black_box(self); + } +} + +#[bench] +fn bench_in_place_collect_droppable(b: &mut Bencher) { + let v: Vec<Droppable> = std::iter::repeat_with(|| Droppable(0)).take(1000).collect(); + b.iter(|| { + v.clone() + .into_iter() + .skip(100) + .enumerate() + .map(|(i, e)| Droppable(i ^ e.0)) + .collect::<Vec<_>>() + }) +} + +// node.js gives out of memory error to use with length 1_100_000 +#[cfg(target_os = "emscripten")] +const LEN: usize = 4096; + +#[cfg(not(target_os = "emscripten"))] +const LEN: usize = 16384; + +#[bench] +fn bench_chain_collect(b: &mut Bencher) { + let data = black_box([0; LEN]); + b.iter(|| data.iter().cloned().chain([1]).collect::<Vec<_>>()); +} + +#[bench] +fn bench_chain_chain_collect(b: &mut Bencher) { + let data = black_box([0; LEN]); + b.iter(|| data.iter().cloned().chain([1]).chain([2]).collect::<Vec<_>>()); +} + +#[bench] +fn bench_nest_chain_chain_collect(b: &mut Bencher) { + let data = black_box([0; LEN]); + b.iter(|| { + data.iter().cloned().chain([1].iter().chain([2].iter()).cloned()).collect::<Vec<_>>() + }); +} + +#[bench] +fn bench_range_map_collect(b: &mut Bencher) { + b.iter(|| (0..LEN).map(|_| u32::default()).collect::<Vec<_>>()); +} + +#[bench] +fn bench_chain_extend_ref(b: &mut Bencher) { + let data = black_box([0; LEN]); + b.iter(|| { + let mut v = Vec::<u32>::with_capacity(data.len() + 1); + v.extend(data.iter().chain([1].iter())); + v + }); +} + +#[bench] +fn bench_chain_extend_value(b: &mut Bencher) { + let data = black_box([0; LEN]); + b.iter(|| { + let mut v = Vec::<u32>::with_capacity(data.len() + 1); + v.extend(data.iter().cloned().chain(Some(1))); + v + }); +} + +#[bench] +fn bench_rev_1(b: &mut Bencher) { + let data = black_box([0; LEN]); + b.iter(|| { + let mut v = Vec::<u32>::new(); + v.extend(data.iter().rev()); + v + }); +} + +#[bench] +fn bench_rev_2(b: &mut Bencher) { + let data = black_box([0; LEN]); + b.iter(|| { + let mut v = Vec::<u32>::with_capacity(data.len()); + v.extend(data.iter().rev()); + v + }); +} + +#[bench] +fn bench_map_regular(b: &mut Bencher) { + let data = black_box([(0, 0); LEN]); + b.iter(|| { + let mut v = Vec::<u32>::new(); + v.extend(data.iter().map(|t| t.1)); + v + }); +} + +#[bench] +fn bench_map_fast(b: &mut Bencher) { + let data = black_box([(0, 0); LEN]); + b.iter(|| { + let mut result: Vec<u32> = Vec::with_capacity(data.len()); + for i in 0..data.len() { + unsafe { + *result.as_mut_ptr().add(i) = data[i].0; + result.set_len(i); + } + } + result + }); +} + +fn random_sorted_fill(mut seed: u32, buf: &mut [u32]) { + let mask = if buf.len() < 8192 { + 0xFF + } else if buf.len() < 200_000 { + 0xFFFF + } else { + 0xFFFF_FFFF + }; + + for item in buf.iter_mut() { + seed ^= seed << 13; + seed ^= seed >> 17; + seed ^= seed << 5; + + *item = seed & mask; + } + + buf.sort(); +} + +// Measures performance of slice dedup impl. +// This was used to justify separate implementation of dedup for Vec. +// This algorithm was used for Vecs prior to Rust 1.52. +fn bench_dedup_slice_truncate(b: &mut Bencher, sz: usize) { + let mut template = vec![0u32; sz]; + b.bytes = size_of_val(template.as_slice()) as u64; + random_sorted_fill(0x43, &mut template); + + let mut vec = template.clone(); + b.iter(|| { + let vec = black_box(&mut vec); + let len = { + let (dedup, _) = vec.partition_dedup(); + dedup.len() + }; + vec.truncate(len); + + black_box(vec.first()); + let vec = black_box(vec); + vec.clear(); + vec.extend_from_slice(&template); + }); +} + +// Measures performance of Vec::dedup on random data. +fn bench_vec_dedup_random(b: &mut Bencher, sz: usize) { + let mut template = vec![0u32; sz]; + b.bytes = size_of_val(template.as_slice()) as u64; + random_sorted_fill(0x43, &mut template); + + let mut vec = template.clone(); + b.iter(|| { + let vec = black_box(&mut vec); + vec.dedup(); + black_box(vec.first()); + let vec = black_box(vec); + vec.clear(); + vec.extend_from_slice(&template); + }); +} + +// Measures performance of Vec::dedup when there is no items removed +fn bench_vec_dedup_none(b: &mut Bencher, sz: usize) { + let mut template = vec![0u32; sz]; + b.bytes = size_of_val(template.as_slice()) as u64; + template.chunks_exact_mut(2).for_each(|w| { + w[0] = black_box(0); + w[1] = black_box(5); + }); + + let mut vec = template.clone(); + b.iter(|| { + let vec = black_box(&mut vec); + vec.dedup(); + black_box(vec.first()); + // Unlike other benches of `dedup` + // this doesn't reinitialize vec + // because we measure how efficient dedup is + // when no memory written + }); +} + +// Measures performance of Vec::dedup when there is all items removed +fn bench_vec_dedup_all(b: &mut Bencher, sz: usize) { + let mut template = vec![0u32; sz]; + b.bytes = size_of_val(template.as_slice()) as u64; + template.iter_mut().for_each(|w| { + *w = black_box(0); + }); + + let mut vec = template.clone(); + b.iter(|| { + let vec = black_box(&mut vec); + vec.dedup(); + black_box(vec.first()); + let vec = black_box(vec); + vec.clear(); + vec.extend_from_slice(&template); + }); +} + +#[bench] +fn bench_dedup_slice_truncate_100(b: &mut Bencher) { + bench_dedup_slice_truncate(b, 100); +} +#[bench] +fn bench_dedup_random_100(b: &mut Bencher) { + bench_vec_dedup_random(b, 100); +} + +#[bench] +fn bench_dedup_none_100(b: &mut Bencher) { + bench_vec_dedup_none(b, 100); +} + +#[bench] +fn bench_dedup_all_100(b: &mut Bencher) { + bench_vec_dedup_all(b, 100); +} + +#[bench] +fn bench_dedup_slice_truncate_1000(b: &mut Bencher) { + bench_dedup_slice_truncate(b, 1000); +} +#[bench] +fn bench_dedup_random_1000(b: &mut Bencher) { + bench_vec_dedup_random(b, 1000); +} + +#[bench] +fn bench_dedup_none_1000(b: &mut Bencher) { + bench_vec_dedup_none(b, 1000); +} + +#[bench] +fn bench_dedup_all_1000(b: &mut Bencher) { + bench_vec_dedup_all(b, 1000); +} + +#[bench] +fn bench_dedup_slice_truncate_10000(b: &mut Bencher) { + bench_dedup_slice_truncate(b, 10000); +} +#[bench] +fn bench_dedup_random_10000(b: &mut Bencher) { + bench_vec_dedup_random(b, 10000); +} + +#[bench] +fn bench_dedup_none_10000(b: &mut Bencher) { + bench_vec_dedup_none(b, 10000); +} + +#[bench] +fn bench_dedup_all_10000(b: &mut Bencher) { + bench_vec_dedup_all(b, 10000); +} + +#[bench] +fn bench_dedup_slice_truncate_100000(b: &mut Bencher) { + bench_dedup_slice_truncate(b, 100000); +} +#[bench] +fn bench_dedup_random_100000(b: &mut Bencher) { + bench_vec_dedup_random(b, 100000); +} + +#[bench] +fn bench_dedup_none_100000(b: &mut Bencher) { + bench_vec_dedup_none(b, 100000); +} + +#[bench] +fn bench_dedup_all_100000(b: &mut Bencher) { + bench_vec_dedup_all(b, 100000); +} + +#[bench] +fn bench_flat_map_collect(b: &mut Bencher) { + let v = vec![777u32; 500000]; + b.iter(|| v.iter().flat_map(|color| color.rotate_left(8).to_be_bytes()).collect::<Vec<_>>()); +} + +/// Reference benchmark that `retain` has to compete with. +#[bench] +fn bench_retain_iter_100000(b: &mut Bencher) { + let mut v = Vec::with_capacity(100000); + + b.iter(|| { + let mut tmp = std::mem::take(&mut v); + tmp.clear(); + tmp.extend(black_box(1..=100000)); + v = tmp.into_iter().filter(|x| x & 1 == 0).collect(); + }); +} + +#[bench] +fn bench_retain_100000(b: &mut Bencher) { + let mut v = Vec::with_capacity(100000); + + b.iter(|| { + v.clear(); + v.extend(black_box(1..=100000)); + v.retain(|x| x & 1 == 0) + }); +} + +#[bench] +fn bench_retain_whole_100000(b: &mut Bencher) { + let mut v = black_box(vec![826u32; 100000]); + b.iter(|| v.retain(|x| *x == 826u32)); +} + +#[bench] +fn bench_next_chunk(b: &mut Bencher) { + let v = vec![13u8; 2048]; + + b.iter(|| { + const CHUNK: usize = 8; + + let mut sum = [0u32; CHUNK]; + let mut iter = black_box(v.clone()).into_iter(); + + while let Ok(chunk) = iter.next_chunk::<CHUNK>() { + for i in 0..CHUNK { + sum[i] += chunk[i] as u32; + } + } + + sum + }) +} |