Remove support for old core runtimes

README.md

@@ -112,7 +112,7 @@ The measured data can be exported to different formats (md, html, csv, xml, json
 
 ![](https://raw.githubusercontent.com/dotnet/BenchmarkDotNet/ec962b0bd6854c991d7a3ebd77037579165acb36/docs/images/v0.12.0/rplot.png)
 
-*Supported runtimes:* .NET 5+, .NET Framework 4.6.1+, .NET Core 2.0+, Mono, NativeAOT  
+*Supported runtimes:* .NET 5+, .NET Framework 4.6.1+, .NET Core 3.1+, Mono, NativeAOT  
 *Supported languages:* C#, F#, Visual Basic  
 *Supported OS:* Windows, Linux, macOS  
 *Supported architectures:* x86, x64, ARM, ARM64, Wasm and LoongArch64
@@ -135,8 +135,8 @@ If you want to compare benchmarks with each other,
   mark one of the benchmarks as the [baseline](https://benchmarkdotnet.org/articles/features/baselines.html)
   via `[Benchmark(Baseline = true)]`: BenchmarkDotNet will compare it with all of the other benchmarks.
 If you want to compare performance in different environments, use [jobs](https://benchmarkdotnet.org/articles/configs/jobs.html).
-For example, you can run all the benchmarks on .NET Core 3.0 and Mono via
-  `[SimpleJob(RuntimeMoniker.NetCoreApp30)]` and `[SimpleJob(RuntimeMoniker.Mono)]`.
+For example, you can run all the benchmarks on .NET Core 3.1 and Mono via
+  `[SimpleJob(RuntimeMoniker.NetCoreApp31)]` and `[SimpleJob(RuntimeMoniker.Mono)]`.
 
 If you don't like attributes, you can call most of the APIs via the fluent style and write code like this:
 

docs/articles/configs/toolchains.md

@@ -18,23 +18,23 @@ When you run your benchmarks without specifying the toolchain in an explicit way
 If you want to test multiple frameworks, your project file **MUST target all of them** and you **MUST install the corresponding SDKs**:
 
 ```xml
-<TargetFrameworks>netcoreapp3.0;netcoreapp2.1;net48</TargetFrameworks>
+<TargetFrameworks>netcoreapp3.1;net8.0;net48</TargetFrameworks>
 ```
 
 If you run your benchmarks without specifying any custom settings, BenchmarkDotNet is going to run the benchmarks **using the same framework as the host process**:
 
 ```cmd
-dotnet run -c Release -f netcoreapp2.1 # is going to run the benchmarks using .NET Core 2.1
-dotnet run -c Release -f netcoreapp3.0 # is going to run the benchmarks using .NET Core 3.0
+dotnet run -c Release -f netcoreapp3.1 # is going to run the benchmarks using .NET Core 3.1
+dotnet run -c Release -f net8.0 # is going to run the benchmarks using .NET 8.0
 dotnet run -c Release -f net48         # is going to run the benchmarks using .NET 4.8
 mono $pathToExe                        # is going to run the benchmarks using Mono from your PATH
 ```
 
 To run the benchmarks for multiple runtimes with a single command, you need to specify the target framework moniker names via `--runtimes|-r` console argument:
 
 ```cmd
-dotnet run -c Release -f netcoreapp2.1 --runtimes netcoreapp2.1 netcoreapp3.0 # is going to run the benchmarks using .NET Core 2.1 and .NET Core 3.0
-dotnet run -c Release -f netcoreapp2.1 --runtimes netcoreapp2.1 net48         # is going to run the benchmarks using .NET Core 2.1 and .NET 4.8
+dotnet run -c Release -f net8.0 --runtimes net8.0 netcoreapp3.1 # is going to run the benchmarks using .NET 8.0 and .NET Core 3.1
+dotnet run -c Release -f net8.0 --runtimes net8.0 net48         # is going to run the benchmarks using .NET 8.0 and .NET 4.8
 ```
 
 What is going to happen if you provide multiple Full .NET Framework monikers? Let's say:
@@ -67,8 +67,8 @@ namespace BenchmarkDotNet.Samples
 {
     [SimpleJob(RuntimeMoniker.Net48)]
     [SimpleJob(RuntimeMoniker.Mono)]
-    [SimpleJob(RuntimeMoniker.NetCoreApp21)]
-    [SimpleJob(RuntimeMoniker.NetCoreApp30)]
+    [SimpleJob(RuntimeMoniker.NetCoreApp31)]
+    [SimpleJob(RuntimeMoniker.Net80)]
     public class TheClassWithBenchmarks
 ```
 
@@ -115,9 +115,9 @@ public class MyConfig : ManualConfig
         Add(Job.Default.With(
             CsProjCoreToolchain.From(
                 new NetCoreAppSettings(
-                    targetFrameworkMoniker: "netcoreapp2.1", 
-                    runtimeFrameworkVersion: "2.1.0-preview2-25628-01", 
-                    name: ".NET Core 2.1"))));
+                    targetFrameworkMoniker: "net8.0-windows",
+                    runtimeFrameworkVersion: "8.0.101",
+                    name: ".NET 8.0 Windows"))));
     }
 }
 ```
@@ -146,11 +146,11 @@ public class CustomPathsConfig : ManualConfig
     public CustomPathsConfig() 
     {
         var dotnetCli32bit = NetCoreAppSettings
-            .NetCoreApp20
+            .NetCoreApp31
             .WithCustomDotNetCliPath(@"C:\Program Files (x86)\dotnet\dotnet.exe", "32 bit cli");
 
         var dotnetCli64bit = NetCoreAppSettings
-            .NetCoreApp20
+            .NetCoreApp31
             .WithCustomDotNetCliPath(@"C:\Program Files\dotnet\dotnet.exe", "64 bit cli");
 
         AddJob(Job.RyuJitX86.WithToolchain(CsProjCoreToolchain.From(dotnetCli32bit)).WithId("32 bit cli"));

docs/articles/faq.md

@@ -13,17 +13,17 @@ See also: [BenchmarkDotNet#237](https://github.com/dotnet/BenchmarkDotNet/issues
 
 * **Q** Why can't I install BenchmarkDotNet in a new .NET Core Console App in Visual Studio 2017?
 
-    **A** BenchmarkDotNet supports only netcoreapp2.0+.
+    **A** BenchmarkDotNet supports only netcoreapp3.1+.
 Some old Visual Studio 2017 can create a new application which targets netcoreapp1.0.
-You should upgrade it up to 2.0.
+You should upgrade it up to 3.1.
 If you want to target netcoreapp1.0 in your main assembly, it's recommended to create a separated project for benchmarks.
 
 * **Q** I created a new .NET Core Console App in Visual Studio 2017. Now I want to run my code on CoreCLR, full .NET Framework, and Mono. How can I do it?
 
     **A** Use the following lines in your `.csproj` file:
 
     ```xml
-    <TargetFrameworks>netcoreapp2.0;net46</TargetFrameworks>
+    <TargetFrameworks>netcoreapp3.1;net46</TargetFrameworks>
     <PlatformTarget>AnyCPU</PlatformTarget>
     ```
 
@@ -33,7 +33,7 @@ If you want to target netcoreapp1.0 in your main assembly, it's recommended to c
     [CoreJob, ClrJob, MonoJob]
     ```
 
-* **Q** My source code targets old versions of .NET Framework or .NET Core, but BenchmarkDotNet requires `net461` and `netcoreapp2.0`. How can I run benchmarks in this case?
+* **Q** My source code targets old versions of .NET Framework or .NET Core, but BenchmarkDotNet requires `net461` and `netcoreapp3.1`. How can I run benchmarks in this case?
 
     **A** It's a good practice to introduce an additional console application (e.g. `MyAwesomeLibrary.Benchmarks`) which will depend on your code and BenchmarkDotNet.
 Due to the fact that users usually run benchmarks in a develop environment and don't distribute benchmarks for users, it shouldn't be a problem.

docs/articles/guides/console-args.md

@@ -117,28 +117,29 @@ You can also filter the benchmarks by categories:
 The `--runtimes` or just `-r` allows you to run the benchmarks for selected Runtimes. Available options are:
 
 * Clr - BDN will either use Roslyn (if you run it as .NET app) or latest installed .NET SDK to build the benchmarks (if you run it as .NET Core app).
-* Core - if you run it as .NET Core app, BDN will use the same target framework moniker, if you run it as .NET app it's going to use netcoreapp2.1.
+* Core - if you run it as .NET Core app, BDN will use the same target framework moniker, if you run it as .NET app it's going to use net8.0.
 * Mono - it's going to use the Mono from `$Path`, you can override  it with `--monoPath`.
-* net46, net461, net462, net47, net471, net472 - to build and run benchmarks against specific .NET framework version.
-* netcoreapp2.0, netcoreapp2.1, netcoreapp2.2, netcoreapp3.0, netcoreapp3.1, net5.0, net6.0, net7.0 - to build and run benchmarks against specific .NET Core version.
-* nativeaot5.0, nativeaot6.0, nativeaot7.0 - to build and run benchmarks using NativeAOT. Can be customized with additional options: `--ilcPath`, `--ilCompilerVersion`.
+* net46, net461, net462, net47, net471, net472, net48, net481 - to build and run benchmarks against specific .NET Framework version.
+* netcoreapp3.1, net5.0, net6.0, net7.0, net8.0 - to build and run benchmarks against specific .NET (Core) version.
+* nativeaot5.0, nativeaot6.0, nativeaot7.0, nativeaot8.0 - to build and run benchmarks using NativeAOT. Can be customized with additional options: `--ilcPath`, `--ilCompilerVersion`.
+* mono6.0, mono7.0, mono8.0 - to build and run benchmarks with .Net 6+ using MonoVM.
 
-Example: run the benchmarks for .NET 4.7.2 and .NET Core 2.1:
+Example: run the benchmarks for .NET 4.7.2 and .NET 8.0:
 
 ```log
-dotnet run -c Release -- --runtimes net472 netcoreapp2.1
+dotnet run -c Release -- --runtimes net472 net8.0
 ```
 
-Example: run the benchmarks for .NET Core 3.0 and latest .NET SDK installed on your PC:
+Example: run the benchmarks for .NET Core 3.1 and latest .NET SDK installed on your PC:
 
 ```log
-dotnet run -c Release -f netcoreapp3.0 -- --runtimes clr core
+dotnet run -c Release -f netcoreapp3.1 -- --runtimes clr core
 ```
 
-But same command executed with `-f netcoreapp2.0` is going to run the benchmarks for .NET Core 2.0:
+But same command executed with `-f net6.0` is going to run the benchmarks for .NET 6.0:
 
 ```log
-dotnet run -c Release -f netcoreapp2.0 -- --runtimes clr core
+dotnet run -c Release -f net6.0 -- --runtimes clr core
 ```
 
 ## Number of invocations and iterations
@@ -207,10 +208,10 @@ To perform a Mann–Whitney U Test and display the results in a dedicated column
 
 * `--statisticalTest`- Threshold for Mann–Whitney U Test. Examples: 5%, 10ms, 100ns, 1s
 
-Example: run Mann–Whitney U test with relative ratio of 5% for all benchmarks for .NET Core 2.0 (base) vs .NET Core 2.1 (diff). .NET Core 2.0 will be baseline because it was first.
+Example: run Mann–Whitney U test with relative ratio of 5% for all benchmarks for .NET 6.0 (base) vs .NET 8.0 (diff). .NET 6.0 will be baseline because it was first.
 
 ```log
-dotnet run -c Release -- --filter * --runtimes netcoreapp2.0 netcoreapp2.1 --statisticalTest 5%
+dotnet run -c Release -- --filter * --runtimes net6.0 net8.0 --statisticalTest 5%
 ```
 
 ## More

docs/articles/guides/troubleshooting.md

@@ -11,7 +11,7 @@ How do you know that BenchmarkDotNet has failed to build the project? BDN is goi
 // ***** BenchmarkRunner: Start   *****
 // ***** Found 1 benchmark(s) in total *****
 // ***** Building 1 exe(s) in Parallel: Start   *****
-// start dotnet restore  /p:UseSharedCompilation=false /p:BuildInParallel=false /m:1 /p:Deterministic=true /p:Optimize=true in C:\Projects\BenchmarkDotNet\samples\BenchmarkDotNet.Samples\bin\Release\netcoreapp2.1\c6045772-d3c7-4dbe-ab37-4aca6dcb6ec4
+// start dotnet restore  /p:UseSharedCompilation=false /p:BuildInParallel=false /m:1 /p:Deterministic=true /p:Optimize=true in C:\Projects\BenchmarkDotNet\samples\BenchmarkDotNet.Samples\bin\Release\net8.0\c6045772-d3c7-4dbe-ab37-4aca6dcb6ec4
 // command took 0.51s and exited with 1
 // ***** Done, took 00:00:00 (0.66 sec)   *****
 // Found 1 benchmarks:
@@ -20,10 +20,10 @@ How do you know that BenchmarkDotNet has failed to build the project? BDN is goi
 // Build Error: Standard output:
 
  Standard error:
- C:\Projects\BenchmarkDotNet\samples\BenchmarkDotNet.Samples\bin\Release\netcoreapp2.1\c6045772-d3c7-4dbe-ab37-4aca6dcb6ec4\BenchmarkDotNet.Autogenerated.csproj(36,1): error MSB4025: The project file could not be loaded. Unexpected end of file while parsing Comment has occurred. Line 36, position 1.
+ C:\Projects\BenchmarkDotNet\samples\BenchmarkDotNet.Samples\bin\Release\net8.0\c6045772-d3c7-4dbe-ab37-4aca6dcb6ec4\BenchmarkDotNet.Autogenerated.csproj(36,1): error MSB4025: The project file could not be loaded. Unexpected end of file while parsing Comment has occurred. Line 36, position 1.
 
 // BenchmarkDotNet has failed to build the auto-generated boilerplate code.
-// It can be found in C:\Projects\BenchmarkDotNet\samples\BenchmarkDotNet.Samples\bin\Release\netcoreapp2.1\c6045772-d3c7-4dbe-ab37-4aca6dcb6ec4
+// It can be found in C:\Projects\BenchmarkDotNet\samples\BenchmarkDotNet.Samples\bin\Release\net8.0\c6045772-d3c7-4dbe-ab37-4aca6dcb6ec4
 // Please follow the troubleshooting guide: https://benchmarkdotnet.org/articles/guides/troubleshooting.html
 ```
 

docs/articles/overview.md

@@ -10,7 +10,7 @@ name: Overview
 Create new console application and install the [BenchmarkDotNet](https://www.nuget.org/packages/BenchmarkDotNet/) NuGet package. We support:
 
 * *Projects:* classic and modern with PackageReferences
-* *Runtimes:* Full .NET Framework (4.6+), .NET Core (2.0+), Mono, NativeAOT
+* *Runtimes:* Full .NET Framework (4.6+), .NET Core (3.1+), Mono, NativeAOT
 * *OS:* Windows, Linux, MacOS
 * *Languages:* C#, F#, VB
 

samples/BenchmarkDotNet.Samples/IntroEnvVars.cs

@@ -14,8 +14,8 @@ private class ConfigWithCustomEnvVars : ManualConfig
 
             public ConfigWithCustomEnvVars()
             {
-                AddJob(Job.Default.WithRuntime(CoreRuntime.Core21).WithId("Inlining enabled"));
-                AddJob(Job.Default.WithRuntime(CoreRuntime.Core21)
+                AddJob(Job.Default.WithRuntime(CoreRuntime.Core80).WithId("Inlining enabled"));
+                AddJob(Job.Default.WithRuntime(CoreRuntime.Core80)
                     .WithEnvironmentVariables(new EnvironmentVariable(JitNoInline, "1"))
                     .WithId("Inlining disabled"));
             }

samples/BenchmarkDotNet.Samples/IntroFluentConfigBuilder.cs

@@ -38,7 +38,7 @@ public static void Run()
                 .Run<Algo_Md5VsSha256>(
                     DefaultConfig.Instance
                         .AddJob(Job.Default.WithRuntime(ClrRuntime.Net462))
-                        .AddJob(Job.Default.WithRuntime(CoreRuntime.Core21))
+                        .AddJob(Job.Default.WithRuntime(CoreRuntime.Core80))
                         .AddValidator(ExecutionValidator.FailOnError));
         }
     }

src/BenchmarkDotNet.Annotations/Jobs/RuntimeMoniker.cs

@@ -57,22 +57,27 @@ public enum RuntimeMoniker
         /// <summary>
         /// .NET Core 2.0
         /// </summary>
-        NetCoreApp20,
+        [Obsolete("This runtime is no longer supported. Use a newer runtime or use BenchmarkDotNet v0.14.X or older.", true)]
+        // Assigning explicit values so we can check for them without the compiler erroring.
+        NetCoreApp20 = 10,
 
         /// <summary>
         /// .NET Core 2.1
         /// </summary>
-        NetCoreApp21,
+        [Obsolete("This runtime is no longer supported. Use a newer runtime or use BenchmarkDotNet v0.14.X or older.", true)]
+        NetCoreApp21 = 11,
 
         /// <summary>
         /// .NET Core 2.2
         /// </summary>
-        NetCoreApp22,
+        [Obsolete("This runtime is no longer supported. Use a newer runtime or use BenchmarkDotNet v0.14.X or older.", true)]
+        NetCoreApp22 = 12,
 
         /// <summary>
         /// .NET Core 3.0
         /// </summary>
-        NetCoreApp30,
+        [Obsolete("This runtime is no longer supported. Use a newer runtime or use BenchmarkDotNet v0.14.X or older.", true)]
+        NetCoreApp30 = 13,
 
         /// <summary>
         /// .NET Core 3.1

src/BenchmarkDotNet.Diagnostics.dotMemory/DotMemoryDiagnoser.cs

@@ -107,11 +107,6 @@ internal override bool IsSupported(RuntimeMoniker runtimeMoniker)
             case RuntimeMoniker.NetCoreApp50:
 #pragma warning restore CS0618 // Type or member is obsolete
                 return false;
-            case RuntimeMoniker.NetCoreApp20:
-            case RuntimeMoniker.NetCoreApp21:
-            case RuntimeMoniker.NetCoreApp22:
-                return OsDetector.IsWindows();
-            case RuntimeMoniker.NetCoreApp30:
             case RuntimeMoniker.NetCoreApp31:
                 return OsDetector.IsWindows() || OsDetector.IsLinux();
             default:

src/BenchmarkDotNet.Diagnostics.dotTrace/DotTraceDiagnoser.cs

@@ -110,11 +110,6 @@ internal override bool IsSupported(RuntimeMoniker runtimeMoniker)
             case RuntimeMoniker.NetCoreApp50:
 #pragma warning restore CS0618 // Type or member is obsolete
                 return false;
-            case RuntimeMoniker.NetCoreApp20:
-            case RuntimeMoniker.NetCoreApp21:
-            case RuntimeMoniker.NetCoreApp22:
-                return OsDetector.IsWindows();
-            case RuntimeMoniker.NetCoreApp30:
             case RuntimeMoniker.NetCoreApp31:
                 return OsDetector.IsWindows() || OsDetector.IsLinux();
             default:

src/BenchmarkDotNet/BenchmarkDotNet.csproj

@@ -22,9 +22,9 @@
     <PackageReference Include="Perfolizer" Version="[0.4.0]" />
     <PackageReference Include="Microsoft.Diagnostics.Tracing.TraceEvent" Version="3.1.8" PrivateAssets="contentfiles;analyzers" />
     <PackageReference Include="Microsoft.DotNet.PlatformAbstractions" Version="3.1.6" />
-    <!-- Do not update these packages, or else netcoreapp3.0 and older will no longer work -->
-    <PackageReference Include="System.Management" Version="5.0.0" />
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.1.0" />
+    <!-- Do not update these packages, or else netcoreapp3.1 may no longer work -->
+    <PackageReference Include="System.Management" Version="6.0.0" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.5.0" />
   </ItemGroup>
   <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard2.0' ">
     <PackageReference Include="Microsoft.Win32.Registry" Version="5.0.0" />