Faster.Map 3.0.2

Faster.Map - fastest c# hashmap

The goal of Faster is to provide the fastest dict/set that integrates into the .net scientific ecosystem.

Faster.Map uses the following:

• Open addressing
• Linear probing
• Upper limit on the probe sequence lenght(psl) which is Log2(size)
• Fibonacci hashing

About

Faster is a small robinhood hashmap with minimal memory overhead and incredibly fast runtime speed. See benchmarks, or try it out yourself. Faster.Map evolved from the fact that C# dictionaries in targetframework 4.0 are terribly slow. So i decided to create my own robinhood hashmap, turns out that this hashmap even performs better than the current dictionary written in .net5.

How to use

Faster.Map provides 3 unique hashmaps:

1. FastMap<Tkey, TValue> is a hashmap which is highly optimized to be used with numerical keys.
2. Map<Tkey, TValue> is a hashmap which can be used as a replacement to IDicionary.
3. MultiMap<Tkey, Tvalue> is a hashmap that contains of key-value pairs, while permitting multiple entries with the same key. All key-value pairs are stored in a linear fashion and wont require additional Lists e.g Dictionary<int, List<string>>

Examples

Default Example

private FastMap<uint, uint> _map = new FastMap<uint, uint>(16);     
  _map.Emplace(1, 50); 
  _map.Remove(1);
  _map.Get(1, out var result);
  _map.Update(1, 51);
  
 var result = _map[1];    

Map Example

private Map<uint, uint> _map = new Map<uint, uint>(16);
 _map.Emplace(1, 50); 
 _map.Remove(1);
 _map.Get(1, out var result);
 _map.Update(1, 51);
    

MultiMap Example

private MultiMap<uin,t uint> _multimap = new Map<uint, uint>(16);
 _multimap.Emplace(1, 50); 
 _multimap.Remove(24, 24);
 _multimap.RemoveAll(1);
 _multimap.Update(1, 50);
 _multimap.Get(1, out var result);
 _multimap.GetAll(1);
    

Benchmark