Faster.Map 6.0.1

There is a newer version of this package available.
See the version list below for details.

dotnet add package Faster.Map --version 6.0.1

NuGet\Install-Package Faster.Map -Version 6.0.1

This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.

<PackageReference Include="Faster.Map" Version="6.0.1" />

For projects that support PackageReference, copy this XML node into the project file to reference the package.

paket add Faster.Map --version 6.0.1

The NuGet Team does not provide support for this client. Please contact its maintainers for support.

#r "nuget: Faster.Map, 6.0.1"

#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package.

// Install Faster.Map as a Cake Addin
#addin nuget:?package=Faster.Map&version=6.0.1

// Install Faster.Map as a Cake Tool
#tool nuget:?package=Faster.Map&version=6.0.1

The NuGet Team does not provide support for this client. Please contact its maintainers for support.

Faster.Map

The goal of Faster.Map is to create a more efficient and performant alternative to the Dictionary and ConcurrentDictionary classes provided by .NET. These standard collections are widely used for key-value pair storage in .NET applications, but they have certain limitations, particularly in high-performance and concurrent scenarios.

Available Implementations:

DenseMap with SIMD Instructions: Harnesses SIMD (Single Instruction, Multiple Data) instructions for parallel processing, resulting in accelerated lookup times. Ideal for scenarios demanding high throughput and optimal CPU utilization.
RobinHoodMap with Linear Probing: Employs linear probing to resolve hash collisions, reducing the likelihood of clustering and improving access speed. Suitable for applications where a balance between performance and simplicity is required.
CMap is a high-performance, thread-safe, lockfree concurrent hashmap that uses open addressing, quadratic probing, and Fibonacci hashing to manage key-value pairs. The default load factor is set to 0.5, meaning the hash map will resize when it is half full.
Installation:

You can include Faster.Map in your C# project via NuGet Package Manager:

Install-Package Faster.Map

How to use

DenseMap Example

// Example usage in C# (using DenseMap with SIMD Instructions)
using Faster.Map.DenseMap;

// Create a DenseMapSIMD object
var map = new DenseMap<string, string>();

// Add key-value pairs
map.Emplace("key1", "value1");

// Retrieve values
var result = map.Get("key1", out var retrievedValue);

Console.WriteLine(retrievedValue); // Output: "value1"

Tested on platforms:

x86
x64
arm
arm64

Benchmark

BenchmarkDotNet v0.13.12, Windows 11 (10.0.22631.3880/23H2/2023Update/SunValley3)
12th Gen Intel Core i5-12500H, 1 CPU, 16 logical and 12 physical cores
.NET SDK 9.0.100-preview.2.24157.14
  [Host]     : .NET 9.0.0 (9.0.24.12805), X64 RyuJIT AVX2
  DefaultJob : .NET 9.0.0 (9.0.24.12805), X64 RyuJIT AVX2

Retrieving a million pre-generated keys

Method	Length	Mean	Error	StdDev	Ratio	RatioSD	Code Size	Allocated	Alloc Ratio
DenseMap	1000	0.001561 ms	0.0000298 ms	0.0000306 ms	0.55	0.01	312 B	-	NA
RobinhoodMap	1000	0.001453 ms	0.0000072 ms	0.0000063 ms	0.52	0.00	182 B	-	NA
Dictionary	1000	0.002817 ms	0.0000157 ms	0.0000123 ms	1.00	0.01	412 B	-	NA
DenseMap	10000	0.018443 ms	0.0001868 ms	0.0001560 ms	0.25	0.01	312 B	-	NA
RobinhoodMap	10000	0.048846 ms	0.0000682 ms	0.0000570 ms	0.65	0.02	182 B	-	NA
Dictionary	10000	0.074840 ms	0.0013760 ms	0.0034011 ms	1.00	0.06	412 B	-	NA
DenseMap	100000	0.302329 ms	0.0018030 ms	0.0016865 ms	0.28	0.00	289 B	-	0.00
RobinhoodMap	100000	0.525929 ms	0.0020816 ms	0.0018453 ms	0.48	0.00	182 B	1 B	1.00
Dictionary	100000	1.091758 ms	0.0026861 ms	0.0022430 ms	1.00	0.00	393 B	1 B	1.00
DenseMap	400000	1.966361 ms	0.0391485 ms	0.0366195 ms	0.40	0.01	289 B	3 B	0.50
RobinhoodMap	400000	2.377139 ms	0.0238691 ms	0.0223271 ms	0.48	0.01	182 B	3 B	0.50
Dictionary	400000	4.901921 ms	0.0584053 ms	0.0517748 ms	1.00	0.01	412 B	6 B	1.00
DenseMap	900000	9.743361 ms	0.0631023 ms	0.0559385 ms	0.60	0.01	289 B	12 B	0.52
RobinhoodMap	900000	8.845731 ms	0.0784927 ms	0.0734222 ms	0.55	0.01	182 B	12 B	0.52
Dictionary	900000	16.156572 ms	0.1954894 ms	0.1632425 ms	1.00	0.01	412 B	23 B	1.00
DenseMap	1000000	11.216461 ms	0.1142519 ms	0.0954055 ms	0.65	0.01	289 B	12 B	0.52
RobinhoodMap	1000000	11.368053 ms	0.0775996 ms	0.0687900 ms	0.66	0.01	182 B	12 B	0.52
Dictionary	1000000	17.346513 ms	0.1926637 ms	0.1504191 ms	1.00	0.01	412 B	23 B	1.00

Adding a million keys

Method	Length	Mean	Error	StdDev	Median	Allocated
DenseMap	1000	0.04696 ms	0.00105 ms	0.00301 ms	0.04580 ms	784 B
RobinhoodMap	1000	0.05695 ms	0.00139 ms	0.00407 ms	0.05695 ms	448 B
Dictionary	1000	0.05925 ms	0.00302 ms	0.00886 ms	0.05710 ms	448 B
DenseMap	10000	0.10247 ms	0.00204 ms	0.00412 ms	0.10170 ms	784 B
RobinhoodMap	10000	0.11880 ms	0.00235 ms	0.00412 ms	0.11740 ms	784 B
Dictionary	10000	0.28064 ms	0.00560 ms	0.00872 ms	0.28010 ms	784 B
DenseMap	100000	0.74044 ms	0.01424 ms	0.01462 ms	0.73490 ms	784 B
RobinhoodMap	100000	1.09080 ms	0.02139 ms	0.03393 ms	1.08320 ms	448 B
Dictionary	100000	2.99360 ms	0.05919 ms	0.07269 ms	2.98355 ms	784 B
DenseMap	400000	5.01900 ms	0.34001 ms	0.99719 ms	5.46250 ms	784 B
RobinhoodMap	400000	4.83217 ms	0.10687 ms	0.30317 ms	4.76510 ms	784 B
Dictionary	400000	7.67889 ms	0.15666 ms	0.42620 ms	7.59280 ms	784 B
DenseMap	900000	10.63200 ms	0.20614 ms	0.18274 ms	10.60900 ms	784 B
RobinhoodMap	900000	14.09060 ms	0.28137 ms	0.78899 ms	14.05040 ms	784 B
Dictionary	900000	24.58053 ms	0.89271 ms	2.61815 ms	24.80390 ms	784 B
DenseMap	1000000	10.93189 ms	0.21667 ms	0.55930 ms	10.74225 ms	784 B
RobinhoodMap	1000000	17.13302 ms	0.37145 ms	1.05975 ms	16.94610 ms	784 B
Dictionary	1000000	28.22181 ms	0.84126 ms	2.45399 ms	27.72925 ms	784 B

Add and resize

Method	Length	Mean	Error	StdDev	Median	Gen0	Gen1	Gen2	Allocated
DenseMap	1000	0.06888 ms	0.002836 ms	0.008361 ms	0.06740 ms	-	-	-	37.75 KB
RobinhoodMap	1000	0.08617 ms	0.003494 ms	0.010303 ms	0.08575 ms	-	-	-	37.51 KB
Dictionary	1000	0.06571 ms	0.004702 ms	0.013865 ms	0.06270 ms	-	-	-	72.09 KB
DenseMap	10000	0.19847 ms	0.003901 ms	0.007880 ms	0.19530 ms	-	-	-	290.31 KB
RobinhoodMap	10000	0.34157 ms	0.006765 ms	0.007239 ms	0.33995 ms	-	-	-	578.18 KB
Dictionary	10000	0.31703 ms	0.005693 ms	0.009668 ms	0.31630 ms	-	-	-	657.93 KB
DenseMap	100000	1.23743 ms	0.019447 ms	0.015183 ms	1.23370 ms	-	-	-	2306.88 KB
RobinhoodMap	100000	2.31568 ms	0.044450 ms	0.041579 ms	2.30430 ms	-	-	-	4610.78 KB
Dictionary	100000	3.03312 ms	0.057396 ms	0.092684 ms	3.02825 ms	-	-	-	5896.77 KB
DenseMap	400000	5.08197 ms	0.101222 ms	0.108306 ms	5.08500 ms	-	-	-	9219.25 KB
RobinhoodMap	400000	9.40513 ms	0.186977 ms	0.337159 ms	9.31860 ms	-	-	-	18435.23 KB
Dictionary	400000	11.62261 ms	0.232425 ms	0.595794 ms	11.54280 ms	-	-	-	25374.92 KB
DenseMap	900000	12.07392 ms	0.238274 ms	0.222882 ms	12.07595 ms	-	-	-	18435.44 KB
RobinhoodMap	900000	21.91546 ms	0.422548 ms	0.433926 ms	21.90840 ms	-	-	-	36867.18 KB
Dictionary	900000	32.15119 ms	0.642537 ms	1.843559 ms	32.09600 ms	1000.0000	1000.0000	1000.0000	52626.84 KB
DenseMap	1000000	21.12683 ms	0.199052 ms	0.155406 ms	21.11290 ms	-	-	-	36867.63 KB
RobinhoodMap	1000000	26.75000 ms	0.529428 ms	0.742185 ms	26.66140 ms	-	-	-	36867.46 KB
Dictionary	1000000	36.88133 ms	0.731351 ms	1.510366 ms	36.99375 ms	1000.0000	1000.0000	1000.0000	52626.84 KB

Updating a million keys

Method	Length	Mean	Error	StdDev	Median	Allocated
DenseMap	1000	0.001497 ms	0.0000095 ms	0.0000080 ms	0.001497 ms	-
RobinhoodMap	1000	0.001886 ms	0.0000369 ms	0.0000563 ms	0.001887 ms	-
Dictionary	1000	0.003374 ms	0.0000594 ms	0.0000660 ms	0.003388 ms	-
DenseMap	10000	0.018904 ms	0.0000967 ms	0.0000807 ms	0.018898 ms	-
RobinhoodMap	10000	0.028991 ms	0.0001625 ms	0.0001520 ms	0.029036 ms	-
Dictionary	10000	0.086054 ms	0.0001592 ms	0.0001329 ms	0.086069 ms	-
DenseMap	100000	0.722426 ms	0.0139707 ms	0.0171572 ms	0.725357 ms	1 B
RobinhoodMap	100000	0.572789 ms	0.0107215 ms	0.0100289 ms	0.568764 ms	1 B
Dictionary	100000	1.195203 ms	0.0032038 ms	0.0029968 ms	1.196440 ms	1 B
DenseMap	400000	4.508174 ms	0.0646880 ms	0.0605092 ms	4.485129 ms	6 B
RobinhoodMap	400000	2.844626 ms	0.0536748 ms	0.0475813 ms	2.823570 ms	3 B
Dictionary	400000	5.396909 ms	0.0286768 ms	0.0268243 ms	5.405657 ms	6 B
DenseMap	900000	9.321427 ms	0.1539810 ms	0.1365001 ms	9.280112 ms	12 B
RobinhoodMap	900000	8.692224 ms	0.0805071 ms	0.0713675 ms	8.675028 ms	12 B
Dictionary	900000	16.036116 ms	0.1468814 ms	0.1226526 ms	16.054666 ms	23 B
DenseMap	1000000	10.349873 ms	0.1659302 ms	0.1385592 ms	10.316205 ms	12 B
RobinhoodMap	1000000	11.018986 ms	0.2149889 ms	0.5273715 ms	10.852050 ms	12 B
Dictionary	1000000	18.725914 ms	0.2099566 ms	0.1753233 ms	18.752681 ms	23 B

Removing a million keys

Method	Length	Mean	Error	StdDev	Median	Allocated
DenseMap	1000	0.02876 ms	0.001047 ms	0.003037 ms	0.02820 ms	736 B
RobinhoodMap	1000	0.04083 ms	0.001065 ms	0.003089 ms	0.03990 ms	736 B
Dictionary	1000	0.04365 ms	0.002059 ms	0.005973 ms	0.04250 ms	448 B
DenseMap	10000	0.05232 ms	0.000904 ms	0.000755 ms	0.05210 ms	736 B
RobinhoodMap	10000	0.07519 ms	0.001501 ms	0.002892 ms	0.07450 ms	736 B
Dictionary	10000	0.14230 ms	0.002837 ms	0.006686 ms	0.14110 ms	736 B
DenseMap	100000	0.41937 ms	0.030693 ms	0.087072 ms	0.38860 ms	736 B
RobinhoodMap	100000	0.79855 ms	0.023237 ms	0.067415 ms	0.82460 ms	64 B
Dictionary	100000	1.23970 ms	0.024222 ms	0.038419 ms	1.23260 ms	736 B
DenseMap	400000	3.47176 ms	0.099247 ms	0.286350 ms	3.39285 ms	736 B
RobinhoodMap	400000	4.69018 ms	0.105336 ms	0.308932 ms	4.70110 ms	736 B
Dictionary	400000	6.04550 ms	0.118591 ms	0.173829 ms	6.07010 ms	736 B
DenseMap	900000	10.99406 ms	0.212917 ms	0.493468 ms	10.93480 ms	736 B
RobinhoodMap	900000	12.97197 ms	0.358164 ms	1.050432 ms	12.51800 ms	736 B
Dictionary	900000	17.48864 ms	0.273846 ms	0.242757 ms	17.47670 ms	736 B
DenseMap	1000000	12.14540 ms	0.241315 ms	0.435141 ms	12.16020 ms	736 B
RobinhoodMap	1000000	14.51971 ms	0.284443 ms	0.252151 ms	14.44940 ms	736 B
Dictionary	1000000	19.87700 ms	0.305629 ms	0.285886 ms	19.80510 ms	736 B

Add and resize

Method	Length	Mean per Operation	Error per Operation	StdDev per Operation	Median per Operation
DenseMap	1	660.9 ns	56.60 ns	159.6 ns	700.0 ns
RobinhoodMap	1	415.1 ns	53.24 ns	151.0 ns	400.0 ns
QuadMap	1	496.8 ns	58.76 ns	167.7 ns	450.0 ns
Dictionary	1	3,348.5 ns	577.13 ns	1,692.6 ns	3,100.0 ns
DenseMap	10	116.0 ns	9.99 ns	28.8 ns	110.0 ns
RobinhoodMap	10	491.9 ns	60.34 ns	174.1 ns	490.0 ns
QuadMap	10	508.1 ns	48.24 ns	134.5 ns	520.0 ns
Dictionary	10	551.6 ns	54.59 ns	158.4 ns	540.0 ns
DenseMap	100	121.8 ns	7.21 ns	20.3 ns	125.0 ns
RobinhoodMap	100	216.3 ns	17.88 ns	51.3 ns	229.0 ns
QuadMap	100	182.6 ns	12.62 ns	35.2 ns	187.0 ns
Dictionary	100	166.6 ns	15.54 ns	45.3 ns	174.0 ns
DenseMap	1000	94.5 ns	3.46 ns	9.5 ns	95.3 ns
RobinhoodMap	1000	118.8 ns	4.15 ns	11.6 ns	121.1 ns
QuadMap	1000	110.1 ns	3.74 ns	10.2 ns	110.9 ns
Dictionary	1000	96.1 ns	6.38 ns	18.5 ns	98.9 ns
DenseMap	10000	27.5 ns	0.55 ns	1.5 ns	27.4 ns
RobinhoodMap	10000	50.3 ns	1.51 ns	4.1 ns	50.2 ns
QuadMap	10000	50.3 ns	1.59 ns	4.5 ns	50.5 ns
Dictionary	10000	45.8 ns	1.18 ns	3.2 ns	45.5 ns
DenseMap	100000	16.3 ns	0.87 ns	2.5 ns	15.3 ns
RobinhoodMap	100000	32.1 ns	1.55 ns	4.6 ns	31.2 ns
QuadMap	100000	35.3 ns	2.24 ns	6.5 ns	33.3 ns
Dictionary	100000	33.1 ns	3.25 ns	9.5 ns	32.1 ns
DenseMap	1000000	28.0 ns	0.55 ns	0.7 ns	28.0 ns
RobinhoodMap	1000000	37.6 ns	0.93 ns	2.7 ns	36.7 ns
QuadMap	1000000	37.4 ns	1.11 ns	3.3 ns	36.0 ns
Dictionary	1000000	39.6 ns	0.77 ns	1.7 ns	39.7 ns

Add string benchmark

Method	Length	Mean	Error	StdDev	Allocated
DenseMap	1000	0.009561 ms	0.0001123 ms	0.0000995 ms	-
RobinhoodMap	1000	0.009880 ms	0.0001149 ms	0.0001075 ms	-
Dictionary	1000	0.007242 ms	0.0000712 ms	0.0000595 ms	-
DenseMap	10000	0.108277 ms	0.0012752 ms	0.0010649 ms	-
RobinhoodMap	10000	0.127488 ms	0.0006820 ms	0.0006046 ms	-
Dictionary	10000	0.140610 ms	0.0007416 ms	0.0006574 ms	-
DenseMap	100000	1.527491 ms	0.0102525 ms	0.0090886 ms	1 B
RobinhoodMap	100000	1.971168 ms	0.0137025 ms	0.0128173 ms	3 B
Dictionary	100000	1.796192 ms	0.0107030 ms	0.0100116 ms	1 B
DenseMap	400000	15.195286 ms	0.0608646 ms	0.0539549 ms	12 B
RobinhoodMap	400000	20.500458 ms	0.1949961 ms	0.1628305 ms	23 B
Dictionary	400000	10.485305 ms	0.2214228 ms	0.6528703 ms	12 B
DenseMap	900000	51.631312 ms	0.6341017 ms	0.4950649 ms	74 B
RobinhoodMap	900000	68.940244 ms	1.0120403 ms	1.4187392 ms	8 B
Dictionary	900000	37.085791 ms	0.7275504 ms	1.0664340 ms	9 B
DenseMap	1000000	62.505928 ms	1.2287320 ms	2.4820994 ms	14 B
RobinhoodMap	1000000	84.237352 ms	1.6354160 ms	2.2926251 ms	123 B
Dictionary	1000000	45.689701 ms	0.9896159 ms	2.8867563 ms	67 B

Create StringWrapperBenchmark (cached hashcode)

Method	Length	Mean	Error	StdDev	Allocated
DenseMap	1000	0.005590 ms	0.0000622 ms	0.0000582 ms	-
RobinhoodMap	1000	0.004822 ms	0.0000862 ms	0.0000807 ms	-
Dictionary	1000	0.006721 ms	0.0001277 ms	0.0001311 ms	-
DenseMap	10000	0.072046 ms	0.0005074 ms	0.0004237 ms	-
RobinhoodMap	10000	0.071678 ms	0.0010047 ms	0.0008390 ms	-
Dictionary	10000	0.134088 ms	0.0004288 ms	0.0004011 ms	-
DenseMap	100000	1.111280 ms	0.0174223 ms	0.0154444 ms	1 B
RobinhoodMap	100000	1.359501 ms	0.0153216 ms	0.0143318 ms	1 B
Dictionary	100000	1.866555 ms	0.0053967 ms	0.0045064 ms	1 B
DenseMap	400000	13.668025 ms	0.0525273 ms	0.0465641 ms	12 B
RobinhoodMap	400000	13.020727 ms	0.0614468 ms	0.0479736 ms	12 B
Dictionary	400000	10.846306 ms	0.0903438 ms	0.0800874 ms	12 B
DenseMap	900000	34.296921 ms	0.1181645 ms	0.0986727 ms	49 B
RobinhoodMap	900000	33.615793 ms	0.4644336 ms	0.4344315 ms	49 B
Dictionary	900000	41.753783 ms	0.8050352 ms	0.7906522 ms	4 B
DenseMap	1000000	40.145635 ms	0.7456945 ms	0.6975231 ms	57 B
RobinhoodMap	1000000	41.060782 ms	0.5800290 ms	0.5141806 ms	5 B
Dictionary	1000000	40.949160 ms	0.3808110 ms	0.3179945 ms	5 B

Product	Compatible and additional computed target framework versions.
.NET	net9.0 is compatible.

Compatible target framework(s)

Included target framework(s) (in package)

Learn more about Target Frameworks and .NET Standard.

net9.0
- System.IO.Hashing (>= 8.0.0)

NuGet packages (2)

Showing the top 2 NuGet packages that depend on Faster.Map:

Package	Downloads
Faster.Ioc Package Description	2.5K
UPSRestApi UpsRestApi library for .Net used to access UPS API Catalog to browse products and view documentation.	115

GitHub repositories

This package is not used by any popular GitHub repositories.

Version	Downloads	Last updated
6.1.2	43	11/16/2024
6.1.1	95	10/31/2024
6.1.0	94	10/31/2024
6.0.4	116	10/13/2024
6.0.3	172	9/4/2024
6.0.2	107	9/3/2024
6.0.1	100	9/1/2024
6.0.0	130	8/7/2024
5.0.4	956	4/16/2024
5.0.3	489	11/18/2023
5.0.2	225	10/29/2023
5.0.1	141	10/29/2023
5.0.0	162	10/28/2023
4.2.1	308	9/2/2023
4.2.0	2,203	4/24/2023
4.1.6	245	4/24/2023
4.1.5	351	3/19/2023
4.1.4	341	3/14/2023
4.1.3	301	3/14/2023
4.1.2	272	3/14/2023
4.1.1	863	3/10/2023
4.1.0	305	3/9/2023
4.0.9	296	3/9/2023
4.0.8	293	3/9/2023
4.0.7	316	3/6/2023
4.0.6	344	3/3/2023
4.0.5	328	3/1/2023
4.0.4	410	2/24/2023
4.0.3	365	2/23/2023
4.0.2	1,149	1/7/2023
4.0.1	403	1/6/2023
4.0.0	384	1/4/2023
3.0.4.2	750	12/22/2022
3.0.3.9	1,097	12/9/2022
3.0.3.8	762	11/8/2022
3.0.3.7	523	10/27/2022
3.0.3.6	539	10/18/2022
3.0.3.5	438	10/18/2022
3.0.3.4	1,111	9/20/2022
3.0.3.3	1,262	5/19/2022
3.0.3.2	484	5/17/2022
3.0.3.1	477	5/17/2022
3.0.3	479	5/17/2022
3.0.2	494	5/15/2022

Moving on to .NET 90, introducing CMAP which is a concurrent hashmap

Faster.Map 6.0.1

Faster.Map

Available Implementations:

How to use

DenseMap Example

Tested on platforms:

Benchmark

Retrieving a million pre-generated keys

Adding a million keys

Add and resize

Updating a million keys

Removing a million keys

Add and resize

Add string benchmark

Create StringWrapperBenchmark (cached hashcode)

net9.0

NuGet packages (2)

GitHub repositories