out 7.0.0

Provides fast min and max functionality for collections.
Documentation

out

Rust Crates.io Docs

Provides fast min and max functionality for collections.

let mut v = [-5, 4, 1, -3, 2];
let max = out::slice::max(&mut v, 3);
assert_eq!(max, [1, 2, 4]);
assert_eq!(out::slice::min(max, 2), [2, 1]);

This library can provide significant performance increase compared to sorting or converting to a heap when n is small compared to the length of the slice or iterator.

Benchmarks

n = 100, len = 1_000_000:

openSUSE Tumbleweed, i7-5820K @ 3.30GHz, and 16GiB RAM:

test iter::max                ... bench:     918,253 ns/iter (+/- 99,863)
test iter::max_unstable       ... bench:     916,908 ns/iter (+/- 58,050)
test slice::max               ... bench:     698,643 ns/iter (+/- 46,373)
test slice::max_by_cached_key ... bench:   1,516,099 ns/iter (+/- 37,853)
test slice::max_unstable      ... bench:     655,286 ns/iter (+/- 25,017)
test std::binary_heap         ... bench:   6,592,801 ns/iter (+/- 780,590)
test std::sort                ... bench:  63,192,028 ns/iter (+/- 2,338,506)
test std::sort_by_cached_key  ... bench:  66,058,834 ns/iter (+/- 5,447,387)
test std::sort_unstable       ... bench:  30,953,024 ns/iter (+/- 1,141,696)

Windows 10 (msvc), i7-5820K @ 3.30GHz, and 16GiB RAM:

test iter::max                ... bench:   2,650,615 ns/iter (+/- 1,427,458)
test iter::max_unstable       ... bench:   2,604,860 ns/iter (+/- 1,001,639)
test slice::max               ... bench:   2,353,487 ns/iter (+/- 1,140,791)
test slice::max_by_cached_key ... bench:   3,317,930 ns/iter (+/- 1,115,283)
test slice::max_unstable      ... bench:   2,221,975 ns/iter (+/- 1,232,170)
test std::binary_heap         ... bench:   8,666,095 ns/iter (+/- 3,790,987)
test std::sort                ... bench:  73,953,630 ns/iter (+/- 23,036,689)
test std::sort_by_cached_key  ... bench:  79,681,540 ns/iter (+/- 24,554,555)
test std::sort_unstable       ... bench:  35,327,180 ns/iter (+/- 8,306,700)

openSUSE Tumbleweed, i7-12700KF @ 3.61GHz, and 32GiB RAM:

test iter::max                ... bench:     623,477 ns/iter (+/- 49,526)
test iter::max_unstable       ... bench:     629,370 ns/iter (+/- 47,640)
test slice::max               ... bench:     490,442 ns/iter (+/- 31,446)
test slice::max_by_cached_key ... bench:   1,346,982 ns/iter (+/- 81,270)
test slice::max_unstable      ... bench:     487,957 ns/iter (+/- 37,561)
test std::binary_heap         ... bench:   3,520,525 ns/iter (+/- 152,789)
test std::sort                ... bench:  47,232,681 ns/iter (+/- 2,028,844)
test std::sort_by_cached_key  ... bench:  36,308,204 ns/iter (+/- 1,509,123)
test std::sort_unstable       ... bench:  18,652,609 ns/iter (+/- 935,364)

Windows 11 (msvc), i7-12700KF @ 3.61GHz, and 32GiB RAM:

test iter::max                ... bench:   1,054,250 ns/iter (+/- 90,022)
test iter::max_unstable       ... bench:   1,054,852 ns/iter (+/- 103,904)
test slice::max               ... bench:     925,992 ns/iter (+/- 91,759)
test slice::max_by_cached_key ... bench:   1,799,090 ns/iter (+/- 112,800)
test slice::max_unstable      ... bench:     923,361 ns/iter (+/- 97,847)
test std::binary_heap         ... bench:   3,433,625 ns/iter (+/- 177,130)
test std::sort                ... bench:  49,211,390 ns/iter (+/- 959,550)
test std::sort_by_cached_key  ... bench:  38,133,930 ns/iter (+/- 1,525,721)
test std::sort_unstable       ... bench:  20,959,570 ns/iter (+/- 567,623)

License

Licensed under either of

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.