11 releases
| 0.3.0 | Oct 27, 2019 |
|---|---|
| 0.2.0 | Oct 27, 2019 |
| 0.1.8 | Jul 11, 2019 |
| 0.1.3 | Apr 13, 2019 |
#2122 in Algorithms
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6KB
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Count Sort
A fast sorting library implementing count sort algorithm which is O(n + k). Designed for very quickly sorting large amounts of data with small range of possible values. It now supports no_std
Currently only supports u8, u16, i8 and i16.
Goals
Improve performance and reduce memory usage.
Performance
Time to clone and sort randomly generated Vec of length specified below. Demonstrates for which lengths it is faster, and for which lengths the overhead is too much.
| length | sort_u8 | .sort() | .sort_unstable() | dmsort |
|---|---|---|---|---|
| 0 | 9.3944 ns | 11.633 ns | 11.887 ns | 11.427 ns |
| 1 | 24.074 ns | 25.148 ns | 25.700 ns | 25.442 ns |
| 4 | 215.06 ns | 48.536 ns | 49.364 ns | 110.13 ns |
| 16 | 370.30 ns | 223.30 ns | 238.12 ns | 429.16 ns |
| 64 | 935.84 ns | 2.1638 us | 1.4000 us | 1.8457 us |
| 256 | 2.0890 us | 11.445 us | 6.5242 us | 7.3119 us |
| 1024 | 3.8468 us | 56.754 us | 27.414 us | 30.193 us |
| 4096 | 7.3327 us | 255.55 us | 77.200 us | 85.214 us |
| 16384 | 19.219 us | 1.0981 ms | 233.50 us | 265.55 us |
| 65536 | 73.449 us | 4.6771 ms | 794.74 us | 914.10 us |
| 262144 | 296.26 us | 19.938 ms | 3.1294 ms | 3.4867 ms |
Usage
Add dependency to Cargo.toml
[dependencies]
count_sort = "0.3"
Use appropriate function out of sort_u8, sort_u16, sort_i8, sort_i16
extern crate count_sort;
fn main () {
let mut data: Vec<u8> = vec![252, 107, 81, 35, 185, 18, 175, 130, 37, 166];
count_sort::sort_u8(&mut data);
println!("{:?}", data);
}