├── .gitignore ├── Enclave.UdpPerf.Test ├── Enclave.UdpPerf.Test.csproj ├── Program.cs └── ThroughputCounter.cs ├── LICENSE ├── README.md └── udp-perf.sln /.gitignore: -------------------------------------------------------------------------------- 1 | ## Ignore Visual Studio temporary files, build results, and 2 | ## files generated by popular Visual Studio add-ons. 3 | ## 4 | ## Get latest from https://github.com/github/gitignore/blob/master/VisualStudio.gitignore 5 | 6 | # User-specific files 7 | *.rsuser 8 | *.suo 9 | *.user 10 | *.userosscache 11 | *.sln.docstates 12 | 13 | # User-specific files (MonoDevelop/Xamarin Studio) 14 | *.userprefs 15 | 16 | # Mono auto generated files 17 | mono_crash.* 18 | 19 | # Build results 20 | [Dd]ebug/ 21 | [Dd]ebugPublic/ 22 | [Rr]elease/ 23 | [Rr]eleases/ 24 | x64/ 25 | x86/ 26 | [Aa][Rr][Mm]/ 27 | [Aa][Rr][Mm]64/ 28 | bld/ 29 | [Bb]in/ 30 | [Oo]bj/ 31 | [Ll]og/ 32 | [Ll]ogs/ 33 | 34 | # Visual Studio 2015/2017 cache/options directory 35 | .vs/ 36 | # Uncomment if you have tasks that create the project's static files in wwwroot 37 | #wwwroot/ 38 | 39 | # Visual Studio 2017 auto generated files 40 | Generated\ Files/ 41 | 42 | # MSTest test Results 43 | [Tt]est[Rr]esult*/ 44 | [Bb]uild[Ll]og.* 45 | 46 | # NUnit 47 | *.VisualState.xml 48 | TestResult.xml 49 | nunit-*.xml 50 | 51 | # Build Results of an ATL Project 52 | [Dd]ebugPS/ 53 | [Rr]eleasePS/ 54 | dlldata.c 55 | 56 | # Benchmark Results 57 | BenchmarkDotNet.Artifacts/ 58 | 59 | # .NET Core 60 | project.lock.json 61 | project.fragment.lock.json 62 | artifacts/ 63 | 64 | # StyleCop 65 | StyleCopReport.xml 66 | 67 | # Files built by Visual Studio 68 | *_i.c 69 | *_p.c 70 | *_h.h 71 | *.ilk 72 | *.meta 73 | *.obj 74 | *.iobj 75 | *.pch 76 | *.pdb 77 | *.ipdb 78 | *.pgc 79 | *.pgd 80 | *.rsp 81 | *.sbr 82 | *.tlb 83 | *.tli 84 | *.tlh 85 | *.tmp 86 | *.tmp_proj 87 | *_wpftmp.csproj 88 | *.log 89 | *.vspscc 90 | *.vssscc 91 | .builds 92 | *.pidb 93 | *.svclog 94 | *.scc 95 | 96 | # Chutzpah Test files 97 | _Chutzpah* 98 | 99 | # Visual C++ cache files 100 | ipch/ 101 | *.aps 102 | *.ncb 103 | *.opendb 104 | *.opensdf 105 | *.sdf 106 | *.cachefile 107 | *.VC.db 108 | *.VC.VC.opendb 109 | 110 | # Visual Studio profiler 111 | *.psess 112 | *.vsp 113 | *.vspx 114 | *.sap 115 | 116 | # Visual Studio Trace Files 117 | *.e2e 118 | 119 | # TFS 2012 Local Workspace 120 | $tf/ 121 | 122 | # Guidance Automation Toolkit 123 | *.gpState 124 | 125 | # ReSharper is a .NET coding add-in 126 | _ReSharper*/ 127 | *.[Rr]e[Ss]harper 128 | *.DotSettings.user 129 | 130 | # TeamCity is a build add-in 131 | _TeamCity* 132 | 133 | # DotCover is a Code Coverage Tool 134 | *.dotCover 135 | 136 | # AxoCover is a Code Coverage Tool 137 | .axoCover/* 138 | !.axoCover/settings.json 139 | 140 | # Visual Studio code coverage results 141 | *.coverage 142 | *.coveragexml 143 | 144 | # NCrunch 145 | _NCrunch_* 146 | .*crunch*.local.xml 147 | nCrunchTemp_* 148 | 149 | # MightyMoose 150 | *.mm.* 151 | AutoTest.Net/ 152 | 153 | # Web workbench (sass) 154 | .sass-cache/ 155 | 156 | # Installshield output folder 157 | [Ee]xpress/ 158 | 159 | # DocProject is a documentation generator add-in 160 | DocProject/buildhelp/ 161 | DocProject/Help/*.HxT 162 | DocProject/Help/*.HxC 163 | DocProject/Help/*.hhc 164 | DocProject/Help/*.hhk 165 | DocProject/Help/*.hhp 166 | DocProject/Help/Html2 167 | DocProject/Help/html 168 | 169 | # Click-Once directory 170 | publish/ 171 | 172 | # Publish Web Output 173 | *.[Pp]ublish.xml 174 | *.azurePubxml 175 | # Note: Comment the next line if you want to checkin your web deploy settings, 176 | # but database connection strings (with potential passwords) will be unencrypted 177 | *.pubxml 178 | *.publishproj 179 | 180 | # Microsoft Azure Web App publish settings. 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2 | using System; 3 | using System.Collections; 4 | using System.Collections.Generic; 5 | using System.CommandLine; 6 | using System.Diagnostics.CodeAnalysis; 7 | using System.Net; 8 | using System.Net.Sockets; 9 | using System.Threading; 10 | using System.Threading.Tasks; 11 | 12 | namespace Enclave.UdpPerf.Test 13 | { 14 | class Program 15 | { 16 | private const int DefaultPacketSize = 1380; 17 | private static int _packetSize; 18 | 19 | private static Dictionary _endpointLookup = new Dictionary(); 20 | private static IPEndPoint _endpointFactory = new IPEndPoint(IPAddress.Any, 0); 21 | 22 | static async Task Main(string[] args) 23 | { 24 | var clientOption = new Option(name: "-c", "Act as a client; destination IP address"); 25 | var packetSizeOption = new Option(name: "-p", () => DefaultPacketSize, "Bytes sent per-packet"); 26 | 27 | var rootCommand = new RootCommand 28 | { 29 | clientOption, 30 | packetSizeOption 31 | }; 32 | 33 | rootCommand.SetHandler(async context => 34 | { 35 | string? clientOptionValue = context.ParseResult.GetValueForOption(clientOption); 36 | int packetSizeOptionValue = context.ParseResult.GetValueForOption(packetSizeOption); 37 | var cancelToken = context.GetCancellationToken(); 38 | 39 | _packetSize = packetSizeOptionValue; 40 | 41 | await RunAsync(clientOptionValue, cancelToken); 42 | }); 43 | 44 | await rootCommand.InvokeAsync(args); 45 | } 46 | 47 | private static async Task RunAsync(string? destinationIp,CancellationToken cancelToken) 48 | { 49 | using var udpSocket = new Socket(SocketType.Dgram, ProtocolType.Udp); 50 | 51 | // Discard our socket when the user cancels. 52 | using var cancelReg = cancelToken.Register(() => udpSocket.Dispose()); 53 | 54 | var throughput = new ThroughputCounter(); 55 | 56 | // Start a background task to print throughput periodically. 57 | _ = PrintThroughputAsync(throughput, cancelToken); 58 | 59 | // Client or server? 60 | if (IPAddress.TryParse(destinationIp, out var destination)) 61 | { 62 | // Client. 63 | Console.WriteLine($"Sending to {destination}:9999"); 64 | await DoSendAsync(udpSocket, new IPEndPoint(destination, 9999), throughput, cancelToken); 65 | } 66 | else 67 | { 68 | // Server. 69 | udpSocket.Bind(new IPEndPoint(IPAddress.Any, 9999)); 70 | 71 | Console.WriteLine("Listening on 0.0.0.0:9999"); 72 | Console.WriteLine("Run with -c to be a client."); 73 | await DoReceiveAsync(udpSocket, throughput, cancelToken); 74 | } 75 | } 76 | 77 | private static async Task PrintThroughputAsync(ThroughputCounter counter, CancellationToken cancelToken) 78 | { 79 | while (!cancelToken.IsCancellationRequested) 80 | { 81 | await Task.Delay(1000, cancelToken); 82 | 83 | var count = counter.SampleAndReset(); 84 | 85 | var megabytes = count / 1024d / 1024d; 86 | 87 | double pps = count / _packetSize; 88 | 89 | Console.WriteLine("{0:0.00}MBps ({1:0.00}Mbps) - {2:0.00}pps", megabytes, megabytes * 8, pps); 90 | } 91 | } 92 | 93 | private static async Task DoSendAsync(Socket udpSocket, IPEndPoint destination, ThroughputCounter throughput, CancellationToken cancelToken) 94 | { 95 | // Taking advantage of pre-pinned memory here using the .NET 5 POH (pinned object heap). 96 | byte[] buffer = GC.AllocateArray(_packetSize, pinned: true); 97 | Memory bufferMem = buffer.AsMemory(); 98 | 99 | // Put something approaching meaningful data in the buffer. 100 | for (var idx = 0; idx < _packetSize; idx++) 101 | { 102 | bufferMem.Span[idx] = (byte)idx; 103 | } 104 | 105 | while (!cancelToken.IsCancellationRequested) 106 | { 107 | await udpSocket.SendToAsync(bufferMem, SocketFlags.None, destination, cancelToken); 108 | 109 | throughput.Add(bufferMem.Length); 110 | } 111 | } 112 | 113 | private static async Task DoReceiveAsync(Socket udpSocket, ThroughputCounter throughput, CancellationToken cancelToken) 114 | { 115 | // Taking advantage of pre-pinned memory here using the .NET5 POH (pinned object heap). 116 | byte[] buffer = GC.AllocateArray(length: 65527, pinned: true); 117 | Memory bufferMem = buffer.AsMemory(); 118 | var receivedAddress = new SocketAddress(udpSocket.AddressFamily); 119 | 120 | while (!cancelToken.IsCancellationRequested) 121 | { 122 | try 123 | { 124 | var receivedBytes = await udpSocket.ReceiveFromAsync(bufferMem, SocketFlags.None, receivedAddress); 125 | 126 | throughput.Add(receivedBytes); 127 | 128 | // Update the packet size based on each packet we receive. 129 | _packetSize = receivedBytes; 130 | 131 | var endpoint = GetEndPoint(receivedAddress); 132 | 133 | // Do something with the endpoint and received data. 134 | } 135 | catch (SocketException) 136 | { 137 | // Socket exception means we are finished. 138 | break; 139 | } 140 | } 141 | } 142 | 143 | private static EndPoint GetEndPoint(SocketAddress receivedAddress) 144 | { 145 | if (!_endpointLookup.TryGetValue(receivedAddress, out var endpoint)) 146 | { 147 | // Create an EndPoint from the SocketAddress 148 | endpoint = _endpointFactory.Create(receivedAddress); 149 | 150 | var lookupCopy = new SocketAddress(receivedAddress.Family, receivedAddress.Size); 151 | receivedAddress.Buffer.CopyTo(lookupCopy.Buffer); 152 | 153 | _endpointLookup[lookupCopy] = endpoint; 154 | } 155 | 156 | return endpoint; 157 | } 158 | } 159 | } 160 | -------------------------------------------------------------------------------- /Enclave.UdpPerf.Test/ThroughputCounter.cs: -------------------------------------------------------------------------------- 1 | using System.Linq; 2 | using System.Threading; 3 | 4 | namespace Enclave.UdpPerf.Test 5 | { 6 | public class ThroughputCounter 7 | { 8 | private ThreadLocal _deltaCount = new ThreadLocal(trackAllValues: true); 9 | 10 | public void Add(long value) 11 | { 12 | _deltaCount.Value += value; 13 | } 14 | 15 | public long SampleAndReset() 16 | { 17 | var original = _deltaCount; 18 | 19 | _deltaCount = new ThreadLocal(trackAllValues: true); 20 | 21 | return original.Values.Sum(); 22 | } 23 | } 24 | } 25 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | MIT License 2 | 3 | Copyright (c) 2021 Enclave Networks 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # High-Performance UDP Socket IO 2 | 3 | This repository contains an example of how to do really efficient UDP socket IO 4 | in .NET8, that can handle both individual very high bandwidth sockets, plus 5 | handle a very large number of concurrent sockets through the use of IO Completion Ports. 6 | 7 | Some of the concepts used in this example includes: 8 | 9 | - `Memory` for buffers. 10 | - Use of the POH (Pinned Object Heap) introduced in .NET5. 11 | - Using the new Socket.ReceiveFromAsync methods that accept a SocketAddress. 12 | - Publishing a trimmed self-contained binary (`dotnet publish Enclave.UdpPerf.Test -c Release -r `) 13 | 14 | ## Running the Example 15 | 16 | If you run the 'Enclave.UdpPerf.Test' binary with no arguments, it starts listening for data on 0.0.0.0:9999. 17 | 18 | If you provide the `-s ` argument, it goes into client mode, and starts sending data to the specified address, on port 9999. 19 | 20 | You should get throughput indicators on both sides, with MB per sec, Mb per sec and packets per sec. 21 | 22 | These results are over a local gigabit ethernet link, with a packet size of 65535 bytes: 23 | 24 | ### Client 25 | ``` 26 | > ./Enclave.UdpPerf.Test.exe -s 27 | Sending to :9999 28 | 112.87MBps (903.00Mbps) - 1811.00pps 29 | 113.56MBps (908.48Mbps) - 1822.00pps 30 | 113.75MBps (909.98Mbps) - 1825.00pps 31 | 112.19MBps (897.51Mbps) - 1800.00pps 32 | 113.87MBps (910.98Mbps) - 1827.00pps 33 | 113.50MBps (907.99Mbps) - 1821.00pps 34 | 113.75MBps (909.98Mbps) - 1825.00pps 35 | 113.93MBps (911.48Mbps) - 1828.00pps 36 | 113.75MBps (909.98Mbps) - 1825.00pps 37 | 113.81MBps (910.48Mbps) - 1826.00pps 38 | 113.87MBps (910.98Mbps) - 1827.00pps 39 | 113.62MBps (908.98Mbps) - 1823.00pps 40 | 113.81MBps (910.48Mbps) - 1826.00pps 41 | ``` 42 | 43 | ### Server 44 | ``` 45 | > ./Enclave.UdpPerf.Test.exe 46 | Listening on 0.0.0.0:9999 47 | 0.00MBps (0.00Mbps) - 0.00pps 48 | 0.00MBps (0.00Mbps) - 0.00pps 49 | 0.00MBps (0.00Mbps) - 0.00pps 50 | 0.00MBps (0.00Mbps) - 0.00pps 51 | 70.87MBps (566.93Mbps) - 1137.00pps 52 | 114.00MBps (911.97Mbps) - 1829.00pps 53 | 112.38MBps (899.01Mbps) - 1803.00pps 54 | 111.88MBps (895.02Mbps) - 1795.00pps 55 | 113.69MBps (909.48Mbps) - 1824.00pps 56 | 112.31MBps (898.51Mbps) - 1802.00pps 57 | 112.44MBps (899.51Mbps) - 1804.00pps 58 | 113.87MBps (910.98Mbps) - 1827.00pps 59 | 112.25MBps (898.01Mbps) - 1801.00pps 60 | 113.81MBps (910.48Mbps) - 1826.00pps 61 | 113.93MBps (911.48Mbps) - 1828.00pps 62 | 112.25MBps (898.01Mbps) - 1801.00pps 63 | 113.69MBps (909.48Mbps) - 1824.00pps 64 | ``` -------------------------------------------------------------------------------- /udp-perf.sln: -------------------------------------------------------------------------------- 1 |  2 | Microsoft Visual Studio Solution File, Format Version 12.00 3 | # Visual Studio Version 17 4 | VisualStudioVersion = 17.1.32228.430 5 | MinimumVisualStudioVersion = 10.0.40219.1 6 | Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Enclave.UdpPerf.Test", "Enclave.UdpPerf.Test\Enclave.UdpPerf.Test.csproj", "{59702EB2-92B5-419C-86A8-C7212819C2E0}" 7 | EndProject 8 | Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{3104EAE0-B9BF-4D80-92D0-7A3F22976855}" 9 | ProjectSection(SolutionItems) = preProject 10 | .gitignore = .gitignore 11 | LICENSE = LICENSE 12 | README.md = README.md 13 | EndProjectSection 14 | EndProject 15 | Global 16 | GlobalSection(SolutionConfigurationPlatforms) = preSolution 17 | Debug|Any CPU = Debug|Any CPU 18 | Release|Any CPU = Release|Any CPU 19 | EndGlobalSection 20 | GlobalSection(ProjectConfigurationPlatforms) = postSolution 21 | {59702EB2-92B5-419C-86A8-C7212819C2E0}.Debug|Any CPU.ActiveCfg = Debug|Any CPU 22 | {59702EB2-92B5-419C-86A8-C7212819C2E0}.Debug|Any CPU.Build.0 = Debug|Any CPU 23 | {59702EB2-92B5-419C-86A8-C7212819C2E0}.Release|Any CPU.ActiveCfg = Release|Any CPU 24 | {59702EB2-92B5-419C-86A8-C7212819C2E0}.Release|Any CPU.Build.0 = Release|Any CPU 25 | EndGlobalSection 26 | GlobalSection(SolutionProperties) = preSolution 27 | HideSolutionNode = FALSE 28 | EndGlobalSection 29 | GlobalSection(ExtensibilityGlobals) = postSolution 30 | SolutionGuid = {092147EA-70FB-41C7-AEB3-DEA422972A66} 31 | EndGlobalSection 32 | EndGlobal 33 | --------------------------------------------------------------------------------