60a900ee10
The unsoundness is not in Peekable per se, it rather is due to the interaction between Peekable being able to hold an extra item and vec::IntoIter's clone implementation shortening the allocation. An alternative solution would be to change IntoIter's clone implementation to keep enough spare capacity available.
734 lines
16 KiB
Rust
734 lines
16 KiB
Rust
use rand::RngCore;
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use std::iter::{repeat, FromIterator};
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use test::{black_box, Bencher};
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#[bench]
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fn bench_new(b: &mut Bencher) {
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b.iter(|| Vec::<u32>::new())
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}
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fn do_bench_with_capacity(b: &mut Bencher, src_len: usize) {
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b.bytes = src_len as u64;
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b.iter(|| Vec::<u32>::with_capacity(src_len))
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}
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#[bench]
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fn bench_with_capacity_0000(b: &mut Bencher) {
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do_bench_with_capacity(b, 0)
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}
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#[bench]
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fn bench_with_capacity_0010(b: &mut Bencher) {
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do_bench_with_capacity(b, 10)
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}
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#[bench]
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fn bench_with_capacity_0100(b: &mut Bencher) {
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do_bench_with_capacity(b, 100)
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}
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#[bench]
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fn bench_with_capacity_1000(b: &mut Bencher) {
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do_bench_with_capacity(b, 1000)
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}
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fn do_bench_from_fn(b: &mut Bencher, src_len: usize) {
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b.bytes = src_len as u64;
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b.iter(|| (0..src_len).collect::<Vec<_>>())
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}
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#[bench]
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fn bench_from_fn_0000(b: &mut Bencher) {
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do_bench_from_fn(b, 0)
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}
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#[bench]
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fn bench_from_fn_0010(b: &mut Bencher) {
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do_bench_from_fn(b, 10)
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}
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#[bench]
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fn bench_from_fn_0100(b: &mut Bencher) {
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do_bench_from_fn(b, 100)
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}
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#[bench]
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fn bench_from_fn_1000(b: &mut Bencher) {
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do_bench_from_fn(b, 1000)
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}
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fn do_bench_from_elem(b: &mut Bencher, src_len: usize) {
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b.bytes = src_len as u64;
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b.iter(|| repeat(5).take(src_len).collect::<Vec<usize>>())
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}
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#[bench]
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fn bench_from_elem_0000(b: &mut Bencher) {
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do_bench_from_elem(b, 0)
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}
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#[bench]
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fn bench_from_elem_0010(b: &mut Bencher) {
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do_bench_from_elem(b, 10)
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}
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#[bench]
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fn bench_from_elem_0100(b: &mut Bencher) {
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do_bench_from_elem(b, 100)
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}
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#[bench]
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fn bench_from_elem_1000(b: &mut Bencher) {
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do_bench_from_elem(b, 1000)
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}
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fn do_bench_from_slice(b: &mut Bencher, src_len: usize) {
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let src: Vec<_> = FromIterator::from_iter(0..src_len);
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b.bytes = src_len as u64;
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b.iter(|| src.as_slice().to_vec());
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}
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#[bench]
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fn bench_from_slice_0000(b: &mut Bencher) {
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do_bench_from_slice(b, 0)
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}
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#[bench]
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fn bench_from_slice_0010(b: &mut Bencher) {
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do_bench_from_slice(b, 10)
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}
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#[bench]
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fn bench_from_slice_0100(b: &mut Bencher) {
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do_bench_from_slice(b, 100)
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}
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#[bench]
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fn bench_from_slice_1000(b: &mut Bencher) {
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do_bench_from_slice(b, 1000)
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}
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fn do_bench_from_iter(b: &mut Bencher, src_len: usize) {
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let src: Vec<_> = FromIterator::from_iter(0..src_len);
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b.bytes = src_len as u64;
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b.iter(|| {
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let dst: Vec<_> = FromIterator::from_iter(src.iter().cloned());
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dst
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});
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}
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#[bench]
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fn bench_from_iter_0000(b: &mut Bencher) {
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do_bench_from_iter(b, 0)
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}
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#[bench]
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fn bench_from_iter_0010(b: &mut Bencher) {
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do_bench_from_iter(b, 10)
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}
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#[bench]
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fn bench_from_iter_0100(b: &mut Bencher) {
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do_bench_from_iter(b, 100)
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}
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#[bench]
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fn bench_from_iter_1000(b: &mut Bencher) {
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do_bench_from_iter(b, 1000)
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}
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fn do_bench_extend(b: &mut Bencher, dst_len: usize, src_len: usize) {
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let dst: Vec<_> = FromIterator::from_iter(0..dst_len);
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let src: Vec<_> = FromIterator::from_iter(dst_len..dst_len + src_len);
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b.bytes = src_len as u64;
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b.iter(|| {
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let mut dst = dst.clone();
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dst.extend(src.clone());
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dst
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});
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}
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#[bench]
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fn bench_extend_0000_0000(b: &mut Bencher) {
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do_bench_extend(b, 0, 0)
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}
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#[bench]
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fn bench_extend_0000_0010(b: &mut Bencher) {
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do_bench_extend(b, 0, 10)
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}
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#[bench]
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fn bench_extend_0000_0100(b: &mut Bencher) {
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do_bench_extend(b, 0, 100)
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}
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#[bench]
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fn bench_extend_0000_1000(b: &mut Bencher) {
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do_bench_extend(b, 0, 1000)
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}
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#[bench]
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fn bench_extend_0010_0010(b: &mut Bencher) {
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do_bench_extend(b, 10, 10)
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}
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#[bench]
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fn bench_extend_0100_0100(b: &mut Bencher) {
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do_bench_extend(b, 100, 100)
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}
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#[bench]
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fn bench_extend_1000_1000(b: &mut Bencher) {
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do_bench_extend(b, 1000, 1000)
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}
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fn do_bench_extend_from_slice(b: &mut Bencher, dst_len: usize, src_len: usize) {
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let dst: Vec<_> = FromIterator::from_iter(0..dst_len);
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let src: Vec<_> = FromIterator::from_iter(dst_len..dst_len + src_len);
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b.bytes = src_len as u64;
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b.iter(|| {
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let mut dst = dst.clone();
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dst.extend_from_slice(&src);
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dst
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});
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}
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#[bench]
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fn bench_extend_recycle(b: &mut Bencher) {
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let mut data = vec![0; 1000];
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b.iter(|| {
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let tmp = std::mem::take(&mut data);
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let mut to_extend = black_box(Vec::new());
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to_extend.extend(tmp.into_iter());
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data = black_box(to_extend);
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});
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black_box(data);
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}
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#[bench]
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fn bench_extend_from_slice_0000_0000(b: &mut Bencher) {
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do_bench_extend_from_slice(b, 0, 0)
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}
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#[bench]
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fn bench_extend_from_slice_0000_0010(b: &mut Bencher) {
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do_bench_extend_from_slice(b, 0, 10)
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}
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#[bench]
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fn bench_extend_from_slice_0000_0100(b: &mut Bencher) {
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do_bench_extend_from_slice(b, 0, 100)
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}
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#[bench]
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fn bench_extend_from_slice_0000_1000(b: &mut Bencher) {
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do_bench_extend_from_slice(b, 0, 1000)
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}
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#[bench]
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fn bench_extend_from_slice_0010_0010(b: &mut Bencher) {
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do_bench_extend_from_slice(b, 10, 10)
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}
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#[bench]
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fn bench_extend_from_slice_0100_0100(b: &mut Bencher) {
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do_bench_extend_from_slice(b, 100, 100)
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}
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#[bench]
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fn bench_extend_from_slice_1000_1000(b: &mut Bencher) {
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do_bench_extend_from_slice(b, 1000, 1000)
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}
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fn do_bench_clone(b: &mut Bencher, src_len: usize) {
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let src: Vec<usize> = FromIterator::from_iter(0..src_len);
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b.bytes = src_len as u64;
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b.iter(|| src.clone());
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}
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#[bench]
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fn bench_clone_0000(b: &mut Bencher) {
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do_bench_clone(b, 0)
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}
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#[bench]
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fn bench_clone_0010(b: &mut Bencher) {
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do_bench_clone(b, 10)
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}
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#[bench]
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fn bench_clone_0100(b: &mut Bencher) {
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do_bench_clone(b, 100)
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}
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#[bench]
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fn bench_clone_1000(b: &mut Bencher) {
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do_bench_clone(b, 1000)
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}
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fn do_bench_clone_from(b: &mut Bencher, times: usize, dst_len: usize, src_len: usize) {
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let dst: Vec<_> = FromIterator::from_iter(0..src_len);
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let src: Vec<_> = FromIterator::from_iter(dst_len..dst_len + src_len);
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b.bytes = (times * src_len) as u64;
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b.iter(|| {
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let mut dst = dst.clone();
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for _ in 0..times {
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dst.clone_from(&src);
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dst = black_box(dst);
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}
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dst
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});
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}
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#[bench]
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fn bench_clone_from_01_0000_0000(b: &mut Bencher) {
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do_bench_clone_from(b, 1, 0, 0)
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}
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#[bench]
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fn bench_clone_from_01_0000_0010(b: &mut Bencher) {
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do_bench_clone_from(b, 1, 0, 10)
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}
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#[bench]
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fn bench_clone_from_01_0000_0100(b: &mut Bencher) {
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do_bench_clone_from(b, 1, 0, 100)
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}
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#[bench]
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fn bench_clone_from_01_0000_1000(b: &mut Bencher) {
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do_bench_clone_from(b, 1, 0, 1000)
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}
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#[bench]
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fn bench_clone_from_01_0010_0010(b: &mut Bencher) {
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do_bench_clone_from(b, 1, 10, 10)
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}
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#[bench]
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fn bench_clone_from_01_0100_0100(b: &mut Bencher) {
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do_bench_clone_from(b, 1, 100, 100)
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}
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#[bench]
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fn bench_clone_from_01_1000_1000(b: &mut Bencher) {
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do_bench_clone_from(b, 1, 1000, 1000)
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}
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#[bench]
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fn bench_clone_from_01_0010_0100(b: &mut Bencher) {
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do_bench_clone_from(b, 1, 10, 100)
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}
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#[bench]
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fn bench_clone_from_01_0100_1000(b: &mut Bencher) {
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do_bench_clone_from(b, 1, 100, 1000)
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}
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#[bench]
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fn bench_clone_from_01_0010_0000(b: &mut Bencher) {
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do_bench_clone_from(b, 1, 10, 0)
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}
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#[bench]
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fn bench_clone_from_01_0100_0010(b: &mut Bencher) {
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do_bench_clone_from(b, 1, 100, 10)
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}
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#[bench]
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fn bench_clone_from_01_1000_0100(b: &mut Bencher) {
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do_bench_clone_from(b, 1, 1000, 100)
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}
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#[bench]
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fn bench_clone_from_10_0000_0000(b: &mut Bencher) {
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do_bench_clone_from(b, 10, 0, 0)
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}
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#[bench]
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fn bench_clone_from_10_0000_0010(b: &mut Bencher) {
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do_bench_clone_from(b, 10, 0, 10)
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}
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#[bench]
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fn bench_clone_from_10_0000_0100(b: &mut Bencher) {
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do_bench_clone_from(b, 10, 0, 100)
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}
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#[bench]
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fn bench_clone_from_10_0000_1000(b: &mut Bencher) {
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do_bench_clone_from(b, 10, 0, 1000)
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}
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#[bench]
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fn bench_clone_from_10_0010_0010(b: &mut Bencher) {
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do_bench_clone_from(b, 10, 10, 10)
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}
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#[bench]
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fn bench_clone_from_10_0100_0100(b: &mut Bencher) {
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do_bench_clone_from(b, 10, 100, 100)
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}
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#[bench]
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fn bench_clone_from_10_1000_1000(b: &mut Bencher) {
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do_bench_clone_from(b, 10, 1000, 1000)
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}
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#[bench]
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fn bench_clone_from_10_0010_0100(b: &mut Bencher) {
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do_bench_clone_from(b, 10, 10, 100)
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}
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#[bench]
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fn bench_clone_from_10_0100_1000(b: &mut Bencher) {
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do_bench_clone_from(b, 10, 100, 1000)
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}
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#[bench]
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fn bench_clone_from_10_0010_0000(b: &mut Bencher) {
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do_bench_clone_from(b, 10, 10, 0)
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}
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#[bench]
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fn bench_clone_from_10_0100_0010(b: &mut Bencher) {
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do_bench_clone_from(b, 10, 100, 10)
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}
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#[bench]
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fn bench_clone_from_10_1000_0100(b: &mut Bencher) {
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do_bench_clone_from(b, 10, 1000, 100)
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}
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macro_rules! bench_in_place {
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($($fname:ident, $type:ty, $count:expr, $init:expr);*) => {
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$(
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#[bench]
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fn $fname(b: &mut Bencher) {
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b.iter(|| {
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let src: Vec<$type> = black_box(vec![$init; $count]);
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src.into_iter()
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.enumerate()
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.map(|(idx, e)| idx as $type ^ e)
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.collect::<Vec<$type>>()
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});
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}
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)+
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};
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}
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bench_in_place![
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bench_in_place_xxu8_0010_i0, u8, 10, 0;
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bench_in_place_xxu8_0100_i0, u8, 100, 0;
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bench_in_place_xxu8_1000_i0, u8, 1000, 0;
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bench_in_place_xxu8_0010_i1, u8, 10, 1;
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bench_in_place_xxu8_0100_i1, u8, 100, 1;
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bench_in_place_xxu8_1000_i1, u8, 1000, 1;
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bench_in_place_xu32_0010_i0, u32, 10, 0;
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bench_in_place_xu32_0100_i0, u32, 100, 0;
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bench_in_place_xu32_1000_i0, u32, 1000, 0;
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bench_in_place_xu32_0010_i1, u32, 10, 1;
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bench_in_place_xu32_0100_i1, u32, 100, 1;
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bench_in_place_xu32_1000_i1, u32, 1000, 1;
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bench_in_place_u128_0010_i0, u128, 10, 0;
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bench_in_place_u128_0100_i0, u128, 100, 0;
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bench_in_place_u128_1000_i0, u128, 1000, 0;
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bench_in_place_u128_0010_i1, u128, 10, 1;
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bench_in_place_u128_0100_i1, u128, 100, 1;
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bench_in_place_u128_1000_i1, u128, 1000, 1
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];
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#[bench]
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fn bench_in_place_recycle(b: &mut Bencher) {
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let mut data = vec![0; 1000];
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b.iter(|| {
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let tmp = std::mem::take(&mut data);
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data = black_box(
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tmp.into_iter()
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.enumerate()
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.map(|(idx, e)| idx.wrapping_add(e))
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.fuse()
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.collect::<Vec<usize>>(),
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);
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});
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}
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#[bench]
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fn bench_in_place_zip_recycle(b: &mut Bencher) {
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let mut data = vec![0u8; 1000];
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let mut rng = rand::thread_rng();
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let mut subst = vec![0u8; 1000];
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rng.fill_bytes(&mut subst[..]);
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b.iter(|| {
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let tmp = std::mem::take(&mut data);
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let mangled = tmp
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.into_iter()
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.zip(subst.iter().copied())
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.enumerate()
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.map(|(i, (d, s))| d.wrapping_add(i as u8) ^ s)
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.collect::<Vec<_>>();
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data = black_box(mangled);
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});
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}
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#[bench]
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fn bench_in_place_zip_iter_mut(b: &mut Bencher) {
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let mut data = vec![0u8; 256];
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let mut rng = rand::thread_rng();
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let mut subst = vec![0u8; 1000];
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rng.fill_bytes(&mut subst[..]);
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b.iter(|| {
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data.iter_mut().enumerate().for_each(|(i, d)| {
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*d = d.wrapping_add(i as u8) ^ subst[i];
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});
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});
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|
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<_>>()
|
|
})
|
|
}
|
|
|
|
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].iter().cloned()).collect::<Vec<_>>());
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_chain_chain_collect(b: &mut Bencher) {
|
|
let data = black_box([0; LEN]);
|
|
b.iter(|| {
|
|
data.iter()
|
|
.cloned()
|
|
.chain([1].iter().cloned())
|
|
.chain([2].iter().cloned())
|
|
.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::with_capacity(data.len());
|
|
for i in 0..data.len() {
|
|
unsafe {
|
|
*result.get_unchecked_mut(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();
|
|
}
|
|
|
|
fn bench_vec_dedup_old(b: &mut Bencher, sz: usize) {
|
|
let mut template = vec![0u32; sz];
|
|
b.bytes = std::mem::size_of_val(template.as_slice()) as u64;
|
|
random_sorted_fill(0x43, &mut template);
|
|
|
|
let mut vec = template.clone();
|
|
b.iter(|| {
|
|
let len = {
|
|
let (dedup, _) = vec.partition_dedup();
|
|
dedup.len()
|
|
};
|
|
vec.truncate(len);
|
|
|
|
black_box(vec.first());
|
|
vec.clear();
|
|
vec.extend_from_slice(&template);
|
|
});
|
|
}
|
|
|
|
fn bench_vec_dedup_new(b: &mut Bencher, sz: usize) {
|
|
let mut template = vec![0u32; sz];
|
|
b.bytes = std::mem::size_of_val(template.as_slice()) as u64;
|
|
random_sorted_fill(0x43, &mut template);
|
|
|
|
let mut vec = template.clone();
|
|
b.iter(|| {
|
|
vec.dedup();
|
|
black_box(vec.first());
|
|
vec.clear();
|
|
vec.extend_from_slice(&template);
|
|
});
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_dedup_old_100(b: &mut Bencher) {
|
|
bench_vec_dedup_old(b, 100);
|
|
}
|
|
#[bench]
|
|
fn bench_dedup_new_100(b: &mut Bencher) {
|
|
bench_vec_dedup_new(b, 100);
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_dedup_old_1000(b: &mut Bencher) {
|
|
bench_vec_dedup_old(b, 1000);
|
|
}
|
|
#[bench]
|
|
fn bench_dedup_new_1000(b: &mut Bencher) {
|
|
bench_vec_dedup_new(b, 1000);
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_dedup_old_10000(b: &mut Bencher) {
|
|
bench_vec_dedup_old(b, 10000);
|
|
}
|
|
#[bench]
|
|
fn bench_dedup_new_10000(b: &mut Bencher) {
|
|
bench_vec_dedup_new(b, 10000);
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_dedup_old_100000(b: &mut Bencher) {
|
|
bench_vec_dedup_old(b, 100000);
|
|
}
|
|
#[bench]
|
|
fn bench_dedup_new_100000(b: &mut Bencher) {
|
|
bench_vec_dedup_new(b, 100000);
|
|
}
|