Cache Key construction benchmark

README.md

How long does it take to construct that cache key?

dotnet run -c Release -f net6.0 --runtimes net48 net5.0 net6.0 --filter *

caching-key.csproj

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFrameworks>net48;net5.0;net6.0</TargetFrameworks>
    <RootNamespace>caching_key</RootNamespace>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="BenchmarkDotNet" Version="0.13.1" />
    <PackageReference Include="Microsoft.Extensions.Caching.Memory" Version="5.0.0" />
  </ItemGroup>

</Project>

Program.cs

using BenchmarkDotNet.Running;
using BenchmarkDotNet.Attributes;
using Microsoft.Extensions.Caching.Memory;

public class Program
{
  public static void Main(string[] args) =>
    BenchmarkSwitcher.FromAssemblies(new[] { typeof(Program).Assembly }).Run(args);
}

[MemoryDiagnoser]
public class CacheKeyBenchmarks
{
  IMemoryCache _cache;
  private const string SEPARATOR = "_";
  private const string USER_CACHE_ID = "USER";
  
  public CacheKeyBenchmarks()
  {
    _cache = new MemoryCache(new MemoryCacheOptions());
  }

  [Benchmark]
  [Arguments(1)]
  public bool CheckItemExists_Hardcoded(int key)
  {
    return _cache.TryGetValue("USER_1234", out object _);
  }

  [Benchmark]
  [Arguments(1)]
  public bool CheckItemExists_Object_ToString(int key)
  {
    return _cache.TryGetValue(new { cacheId = "USER", userKey = key }.ToString(), out object _);
  }

  [Benchmark]
  [Arguments(1)]
  public bool CheckItemExists_Interpolated(int key)
  {
    return _cache.TryGetValue($"USER_{key}", out object _);
  }

  [Benchmark]
  [Arguments(1)]
  public bool CheckItemExists_Join(int key)
  {
    return _cache.TryGetValue(string.Join("_", "USER", key), out object _);
  }

  [Benchmark]
  [Arguments(1)]
  public bool CheckItemExists_Join_Consts(int key)
  {
    return _cache.TryGetValue(string.Join(SEPARATOR, USER_CACHE_ID, key), out object _);
  }

  [Benchmark]
  [Arguments(1)]
  public bool CheckItemExists_Concat(int key)
  {
    return _cache.TryGetValue(string.Concat(USER_CACHE_ID, "_", key), out object _);
  }

  [Benchmark]
  [Arguments(1)]
  public bool CheckItemExists_Concat_Consts(int key)
  {
    return _cache.TryGetValue(string.Concat(USER_CACHE_ID, SEPARATOR, key), out object _);
  }
}

results-multi-framework.md

BenchmarkDotNet=v0.13.1, OS=Windows 10.0.19043.1202 (21H1/May2021Update)
Intel Core i7-8650U CPU 1.90GHz (Kaby Lake R), 1 CPU, 8 logical and 4 physical cores
.NET SDK=6.0.100-preview.7.21379.14
  [Host]     : .NET 6.0.0 (6.0.21.37719), X64 RyuJIT
  Job-THNXQL : .NET 5.0.9 (5.0.921.35908), X64 RyuJIT
  Job-TGUSBV : .NET 6.0.0 (6.0.21.37719), X64 RyuJIT
  Job-XADQDX : .NET Framework 4.8 (4.8.4400.0), X64 RyuJIT

Method	Job	Runtime	Toolchain	key	Mean	Error	StdDev	Ratio	RatioSD	Gen 0	Allocated
CheckItemExists_Hardcoded	Job-THNXQL	.NET 5.0	net5.0	1	121.11 ns	1.858 ns	4.696 ns	0.84	0.05	-	-
CheckItemExists_Hardcoded	Job-TGUSBV	.NET 6.0	net6.0	1	65.47 ns	1.324 ns	1.173 ns	0.45	0.01	-	-
CheckItemExists_Hardcoded	Job-XADQDX	.NET Framework 4.8	net48	1	146.30 ns	2.858 ns	3.614 ns	1.00	0.00	-	-
CheckItemExists_Object_ToString	Job-THNXQL	.NET 5.0	net5.0	1	325.64 ns	6.374 ns	7.588 ns	0.62	0.02	0.0381	160 B
CheckItemExists_Object_ToString	Job-TGUSBV	.NET 6.0	net6.0	1	224.89 ns	3.869 ns	3.231 ns	0.43	0.01	0.0381	160 B
CheckItemExists_Object_ToString	Job-XADQDX	.NET Framework 4.8	net48	1	525.49 ns	7.121 ns	5.560 ns	1.00	0.00	0.0458	193 B
CheckItemExists_Interpolated	Job-THNXQL	.NET 5.0	net5.0	1	196.34 ns	2.763 ns	5.052 ns	0.62	0.02	0.0153	64 B
CheckItemExists_Interpolated	Job-TGUSBV	.NET 6.0	net6.0	1	116.02 ns	2.222 ns	2.079 ns	0.37	0.01	0.0095	40 B
CheckItemExists_Interpolated	Job-XADQDX	.NET Framework 4.8	net48	1	317.94 ns	4.203 ns	3.510 ns	1.00	0.00	0.0229	96 B
CheckItemExists_Join	Job-THNXQL	.NET 5.0	net5.0	1	180.07 ns	3.626 ns	5.645 ns	0.61	0.02	0.0248	104 B
CheckItemExists_Join	Job-TGUSBV	.NET 6.0	net6.0	1	108.13 ns	2.127 ns	2.449 ns	0.37	0.01	0.0248	104 B
CheckItemExists_Join	Job-XADQDX	.NET Framework 4.8	net48	1	296.09 ns	5.705 ns	6.791 ns	1.00	0.00	0.0324	136 B
CheckItemExists_Join_Consts	Job-THNXQL	.NET 5.0	net5.0	1	179.67 ns	3.618 ns	4.829 ns	0.60	0.02	0.0248	104 B
CheckItemExists_Join_Consts	Job-TGUSBV	.NET 6.0	net6.0	1	108.76 ns	2.202 ns	3.493 ns	0.36	0.01	0.0248	104 B
CheckItemExists_Join_Consts	Job-XADQDX	.NET Framework 4.8	net48	1	301.91 ns	6.076 ns	7.684 ns	1.00	0.00	0.0324	136 B
CheckItemExists_Concat	Job-THNXQL	.NET 5.0	net5.0	1	159.32 ns	3.064 ns	4.948 ns	0.60	0.02	0.0153	64 B
CheckItemExists_Concat	Job-TGUSBV	.NET 6.0	net6.0	1	94.54 ns	1.898 ns	1.683 ns	0.35	0.01	0.0153	64 B
CheckItemExists_Concat	Job-XADQDX	.NET Framework 4.8	net48	1	266.56 ns	3.404 ns	3.018 ns	1.00	0.00	0.0229	96 B
CheckItemExists_Concat_Consts	Job-THNXQL	.NET 5.0	net5.0	1	158.23 ns	3.034 ns	2.533 ns	0.61	0.02	0.0153	64 B
CheckItemExists_Concat_Consts	Job-TGUSBV	.NET 6.0	net6.0	1	95.32 ns	1.939 ns	2.841 ns	0.36	0.01	0.0153	64 B
CheckItemExists_Concat_Consts	Job-XADQDX	.NET Framework 4.8	net48	1	260.36 ns	5.211 ns	5.576 ns	1.00	0.00	0.0229	96 B

results.md

BenchmarkDotNet=v0.13.1, OS=Windows 10.0.19043.1202 (21H1/May2021Update)
Intel Core i7-8650U CPU 1.90GHz (Kaby Lake R), 1 CPU, 8 logical and 4 physical cores
.NET SDK=5.0.206
  [Host]     : .NET 5.0.9 (5.0.921.35908), X64 RyuJIT
  DefaultJob : .NET 5.0.9 (5.0.921.35908), X64 RyuJIT

Method	key	Mean	Error	StdDev	Gen 0	Allocated
CheckItemExists_Hardcoded	1	115.2 ns	2.29 ns	3.56 ns	-	-
CheckItemExists_Object_ToString	1	323.1 ns	6.20 ns	15.55 ns	0.0381	160 B
CheckItemExists_Interpolated	1	193.8 ns	3.81 ns	4.96 ns	0.0153	64 B
CheckItemExists_Join	1	179.4 ns	3.48 ns	4.27 ns	0.0248	104 B
CheckItemExists_Join_Consts	1	180.6 ns	3.63 ns	4.72 ns	0.0248	104 B
CheckItemExists_Concat	1	159.7 ns	3.16 ns	3.99 ns	0.0153	64 B
CheckItemExists_Concat_Consts	1	157.6 ns	3.03 ns	3.49 ns	0.0153	64 B