peterrk / slices

fast generic sort for slices in golang

Fast generic sort for slices in golang

This package is based on the slices package in go standard library since v1.21, but has different apis for search and sort.

API for builtin types

func BinarySearch[E constraints.Ordered](list []E, x E) (int, bool)
func IsSorted[E constraints.Ordered](list []E) bool
func Min[E cmp.Ordered](list []E) E
func Max[E cmp.Ordered](list []E) E
func Sort[E constraints.Ordered](list []E)
func SortStable[E constraints.Ordered](list []E)

API for custom types

type Order[E any] struct {
	Less    func(a, b E) bool
	RefLess func(a, b *E) bool
}

func (od *Order[E]) BinarySearch(list []E, x E) (int, bool)
func (od *Order[E]) IsSorted(list []E) bool
func (od *Order[E]) Min(list []E) E
func (od *Order[E]) Max(list []E) E
func (od *Order[E]) Sort(list []E)
func (od *Order[E]) SortStable(list []E)
func (od *Order[E]) SortWithOption(list []E, stable, inplace bool)

Benchmark Result

On Xeon-8374C (X86-64)

name               std time/op  new time/op  delta
Int/Small-1K       27.7µs ± 2%  24.1µs ± 3%  -12.92%  (p=0.008 n=5+5)
Int/Small-10K       315µs ± 0%   249µs ± 0%  -20.96%  (p=0.008 n=5+5)
Int/Small-100K     3.76ms ± 0%  2.86ms ± 0%  -24.06%  (p=0.008 n=5+5)
Int/Small-1M       44.6ms ± 0%  35.4ms ± 0%  -20.57%  (p=0.008 n=5+5)
Int/Random-1K      48.4µs ± 1%  38.8µs ± 1%  -19.69%  (p=0.008 n=5+5)
Int/Random-10K      614µs ± 1%   464µs ± 0%  -24.44%  (p=0.008 n=5+5)
Int/Random-100K    7.58ms ± 0%  5.61ms ± 0%  -26.07%  (p=0.008 n=5+5)
Int/Random-1M      90.3ms ± 1%  65.8ms ± 0%  -27.08%  (p=0.008 n=5+5)
Int/Constant-1K    1.33µs ± 1%  0.93µs ± 1%  -30.13%  (p=0.008 n=5+5)
Int/Constant-10K   11.1µs ± 4%   8.0µs ± 2%  -27.36%  (p=0.008 n=5+5)
Int/Constant-100K  98.0µs ± 5%  67.0µs ± 2%  -31.61%  (p=0.008 n=5+5)
Int/Constant-1M     932µs ± 1%   646µs ± 0%  -30.72%  (p=0.008 n=5+5)
Int/Ascent-1K      1.33µs ± 1%  0.93µs ± 1%  -30.03%  (p=0.008 n=5+5)
Int/Ascent-10K     10.8µs ± 3%   8.0µs ± 3%  -26.21%  (p=0.008 n=5+5)
Int/Ascent-100K    99.1µs ± 5%  66.2µs ± 1%  -33.20%  (p=0.008 n=5+5)
Int/Ascent-1M       926µs ± 0%   646µs ± 0%  -30.19%  (p=0.008 n=5+5)
Int/Descent-1K     1.85µs ± 1%  1.46µs ± 0%  -21.19%  (p=0.008 n=5+5)
Int/Descent-10K    14.8µs ± 3%  12.0µs ± 6%  -18.43%  (p=0.008 n=5+5)
Int/Descent-100K    132µs ± 1%   104µs ± 2%  -21.46%  (p=0.008 n=5+5)
Int/Descent-1M     1.32ms ± 0%  1.04ms ± 1%  -21.37%  (p=0.008 n=5+5)
Int/Mixed-1K       19.9µs ± 3%  17.1µs ± 3%  -13.87%  (p=0.008 n=5+5)
Int/Mixed-10K       219µs ± 1%   231µs ± 0%   +5.53%  (p=0.008 n=5+5)
Int/Mixed-100K     2.54ms ± 0%  2.55ms ± 0%     ~     (p=0.310 n=5+5)
Int/Mixed-1M       29.5ms ± 0%  28.0ms ± 0%   -5.11%  (p=0.008 n=5+5)
Hybrid/5%-4        4.09ms ± 0%  3.06ms ± 0%  -25.07%  (p=0.008 n=5+5)
Hybrid/10%         7.12ms ± 0%  5.33ms ± 0%  -25.04%  (p=0.008 n=5+5)
Hybrid/20%         13.1ms ± 0%   9.9ms ± 0%  -24.73%  (p=0.008 n=5+5)
Hybrid/30%         19.2ms ± 1%  14.4ms ± 0%  -25.00%  (p=0.008 n=5+5)
Hybrid/50%         31.2ms ± 1%  23.5ms ± 0%  -24.70%  (p=0.008 n=5+5)
Float/1K           58.2µs ± 2%  48.6µs ± 1%  -16.58%  (p=0.008 n=5+5)
Float/10K           751µs ± 0%   549µs ± 0%  -26.80%  (p=0.008 n=5+5)
Float/100K         9.28ms ± 0%  6.41ms ± 0%  -30.91%  (p=0.008 n=5+5)
Float/1M            110ms ± 0%    73ms ± 0%  -33.44%  (p=0.008 n=5+5)
Str/1K              130µs ± 0%   125µs ± 0%   -4.00%  (p=0.008 n=5+5)
Str/10K            1.69ms ± 0%  1.64ms ± 0%   -2.73%  (p=0.008 n=5+5)
Str/100K           21.6ms ± 1%  21.1ms ± 1%   -2.41%  (p=0.008 n=5+5)
Str/1M              272ms ± 1%   269ms ± 2%     ~     (p=0.095 n=5+5)
Struct/1K           104µs ± 1%    86µs ± 0%  -17.34%  (p=0.008 n=5+5)
Struct/10K         1.36ms ± 0%  1.07ms ± 0%  -20.93%  (p=0.008 n=5+5)
Struct/100K        16.8ms ± 0%  13.0ms ± 0%  -22.48%  (p=0.008 n=5+5)
Struct/1M           201ms ± 0%   152ms ± 0%  -24.21%  (p=0.008 n=5+5)
Stable/1K           183µs ± 1%    84µs ± 0%  -53.88%  (p=0.008 n=5+5)
Stable/10K         2.71ms ± 0%  1.14ms ± 0%  -58.16%  (p=0.008 n=5+5)
Stable/100K        37.9ms ± 0%  17.4ms ± 0%  -54.15%  (p=0.016 n=5+4)
Stable/1M           498ms ± 1%   175ms ± 1%  -64.74%  (p=0.008 n=5+5)
Pointer/1K         78.7µs ± 1%  66.1µs ± 1%  -15.96%  (p=0.008 n=5+5)
Pointer/10K        1.05ms ± 0%  0.90ms ± 0%  -14.87%  (p=0.008 n=5+5)
Pointer/100K       14.0ms ± 0%  12.1ms ± 0%  -13.52%  (p=0.008 n=5+5)
Pointer/1M          171ms ± 0%   159ms ± 0%   -6.82%  (p=0.008 n=5+5)

On Yitian-710 (ARM64)

name               std time/op  new time/op  delta
Int/Small-1K       21.4µs ± 0%  17.4µs ± 0%  -18.95%  (p=0.008 n=5+5)
Int/Small-10K       253µs ± 0%   207µs ± 0%  -18.18%  (p=0.008 n=5+5)
Int/Small-100K     3.02ms ± 0%  2.47ms ± 0%  -18.42%  (p=0.008 n=5+5)
Int/Small-1M       35.7ms ± 0%  28.8ms ± 0%  -19.54%  (p=0.008 n=5+5)
Int/Random-1K      37.7µs ± 0%  27.6µs ± 0%  -26.84%  (p=0.008 n=5+5)
Int/Random-10K      492µs ± 0%   362µs ± 0%  -26.46%  (p=0.008 n=5+5)
Int/Random-100K    6.09ms ± 0%  4.51ms ± 0%  -25.96%  (p=0.008 n=5+5)
Int/Random-1M      72.5ms ± 0%  53.9ms ± 0%  -25.69%  (p=0.008 n=5+5)
Int/Constant-1K    1.08µs ± 1%  0.70µs ± 0%  -35.23%  (p=0.016 n=5+4)
Int/Constant-10K   9.60µs ± 0%  6.55µs ± 0%  -31.77%  (p=0.008 n=5+5)
Int/Constant-100K  93.1µs ± 0%  63.5µs ± 1%  -31.78%  (p=0.008 n=5+5)
Int/Constant-1M     929µs ± 0%   640µs ± 1%  -31.09%  (p=0.008 n=5+5)
Int/Ascent-1K      1.08µs ± 1%  0.71µs ± 4%  -34.36%  (p=0.008 n=5+5)
Int/Ascent-10K     9.61µs ± 0%  6.57µs ± 0%  -31.57%  (p=0.008 n=5+5)
Int/Ascent-100K    93.1µs ± 0%  63.1µs ± 0%  -32.20%  (p=0.008 n=5+5)
Int/Ascent-1M       929µs ± 0%   639µs ± 1%  -31.27%  (p=0.008 n=5+5)
Int/Descent-1K     1.45µs ± 0%  1.07µs ± 1%  -26.66%  (p=0.008 n=5+5)
Int/Descent-10K    13.2µs ± 0%   9.9µs ± 0%  -25.07%  (p=0.016 n=5+4)
Int/Descent-100K    130µs ± 0%   100µs ± 0%  -23.09%  (p=0.008 n=5+5)
Int/Descent-1M     1.30ms ± 0%  1.02ms ± 1%  -22.02%  (p=0.008 n=5+5)
Int/Mixed-1K       16.3µs ± 4%  12.1µs ± 0%  -25.65%  (p=0.008 n=5+5)
Int/Mixed-10K       187µs ± 0%   150µs ± 0%  -19.82%  (p=0.008 n=5+5)
Int/Mixed-100K     2.20ms ± 0%  1.77ms ± 0%  -19.24%  (p=0.008 n=5+5)
Int/Mixed-1M       25.3ms ± 0%  20.5ms ± 0%  -19.21%  (p=0.008 n=5+5)
Hybrid/5%          3.50ms ± 0%  2.59ms ± 0%  -26.14%  (p=0.008 n=5+5)
Hybrid/10%         5.92ms ± 0%  4.36ms ± 0%  -26.33%  (p=0.008 n=5+5)
Hybrid/20%         10.8ms ± 0%   7.9ms ± 0%  -26.48%  (p=0.008 n=5+5)
Hybrid/30%         15.6ms ± 0%  11.5ms ± 0%  -26.43%  (p=0.008 n=5+5)
Hybrid/50%         25.3ms ± 0%  18.6ms ± 0%  -26.49%  (p=0.008 n=5+5)
Float/1K           46.1µs ± 0%  35.6µs ± 0%  -22.75%  (p=0.008 n=5+5)
Float/10K           606µs ± 0%   467µs ± 0%  -22.85%  (p=0.008 n=5+5)
Float/100K         7.51ms ± 0%  5.79ms ± 0%  -22.83%  (p=0.008 n=5+5)
Float/1M           89.5ms ± 0%  69.0ms ± 0%  -22.84%  (p=0.008 n=5+5)
Str/1K              124µs ± 0%   119µs ± 0%   -4.40%  (p=0.008 n=5+5)
Str/10K            1.54ms ± 0%  1.48ms ± 0%   -3.70%  (p=0.008 n=5+5)
Str/100K           20.1ms ± 1%  19.6ms ± 0%   -2.37%  (p=0.008 n=5+5)
Str/1M              290ms ± 1%   286ms ± 1%   -1.10%  (p=0.032 n=5+5)
Struct/1K           100µs ± 0%    85µs ± 0%  -14.55%  (p=0.008 n=5+5)
Struct/10K         1.32ms ± 0%  1.07ms ± 0%  -19.19%  (p=0.008 n=5+5)
Struct/100K        16.4ms ± 0%  12.7ms ± 0%  -22.38%  (p=0.008 n=5+5)
Struct/1M           196ms ± 0%   141ms ± 2%  -28.06%  (p=0.008 n=5+5)
Stable/1K           186µs ± 0%    73µs ± 0%  -60.49%  (p=0.008 n=5+5)
Stable/10K         2.84ms ± 0%  1.22ms ± 0%  -57.16%  (p=0.008 n=5+5)
Stable/100K        40.5ms ± 0%  14.7ms ± 0%  -63.75%  (p=0.008 n=5+5)
Stable/1M           534ms ± 0%   163ms ± 0%  -69.43%  (p=0.016 n=5+4)
Pointer/1K         63.7µs ± 0%  55.3µs ± 0%  -13.18%  (p=0.008 n=5+5)
Pointer/10K         873µs ± 0%   775µs ± 1%  -11.23%  (p=0.008 n=5+5)
Pointer/100K       12.4ms ± 0%  11.3ms ± 0%   -9.58%  (p=0.008 n=5+5)
Pointer/1M          159ms ± 0%   147ms ± 0%   -7.59%  (p=0.008 n=5+5)