BenchmarkDotNet是一款開源的性能測試工具，使用方式非常簡單，特別是對實現同一功能的兩種方式，猶豫不決時，可以使用它進行個對比。

比如我們比較ADO.NET方式查詢數據庫表，和用Dapper方式獲取數據為表，只需要在兩個方法上增加 [Benchmark]就可以了，然后調用var summary = BenchmarkRunner.Run<Cycle>();就實現了性能測試。

using System; using System.ComponentModel; using System.Data; using System.Data.SqlClient; using System.Security.Cryptography; using BenchmarkDotNet.Attributes; using BenchmarkDotNet.Running; using Dapper;namespace MyBenchmarks {public class Product{public string Name { get; set; }public string ProductNumber { get; set; }public bool MakeFlag { get; set; }public bool FinishedGoodsFlag { get; set; }public string Color { get; set; }public short SafetyStockLevel { get; set; }public short ReorderPoint { get; set; }public decimal StandardCost { get; set; }public decimal ListPrice { get; set; }public string Size { get; set; }public string SizeUnitMeasureCode { get; set; }public string WeightUnitMeasureCode { get; set; }public double Weight { get; set; }public int DaysToManufacture { get; set; }public string ProductLine { get; set; }public string Class { get; set; }public string Style { get; set; }public int ProductSubcategoryID { get; set; }public int ProductModelID { get; set; }public DateTime SellStartDate { get; set; }public DateTime SellEndDate { get; set; }public DateTime DiscontinuedDate { get; set; }public Guid rowguid { get; set; }public DateTime ModifiedDate { get; set; }}public class Cycle{[Benchmark]public void DapperTest(){var conn = new SqlConnection("Data Source=.;Initial Catalog=AdventureWorks2016;Persist Security Info=True;User ID=sa;password=sa;");var table = conn.Query<Product>("select top 100 * from production.product");}[Benchmark]public void CommandTest(){var conn = "Data Source=.;Initial Catalog=AdventureWorks2016;Persist Security Info=True;User ID=sa;password=sa;";var sql = "select top 100 * from production.product";var dapp = new SqlDataAdapter(sql, conn);var table = new DataTable();dapp.Fill(table);}}public class Program{public static void Main(string[] args){var summary = BenchmarkRunner.Run<Cycle>();}} }

運行一下看一下結果，為了減少篇幅，刪除了一些結果，從結果看出，為了得到較為客觀的性能測試結果，BenchmarkDotNet還是做了很多工作的：

OverheadJitting，WorkloadJitting，WorkloadPilot，OverheadWarmup，OverheadActual，WorkloadWarmup，WorkloadActual，WorkloadResult。

并且通過最后的一個表格，清楚的給出了結果。同時還給出了Warnings ，以供參考。

// Validating benchmarks: // ***** BenchmarkRunner: Start ***** // ***** Found 2 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:\MyFile\Source\Repos\Asp.NetCoreExperiment\Asp.NetCoreExperiment\BenchmarkDotNet\Demo01\bin\Release\net6.0\03bf0209-ac26-4de1-b763-4ba03e46cf4d // command took 2.83s and exited with 0 // start dotnet build -c Release --no-restore /p:UseSharedCompilation=false /p:BuildInParallel=false /m:1 /p:Deterministic=true /p:Optimize=true in C:\MyFile\Source\Repos\Asp.NetCoreExperiment\Asp.NetCoreExperiment\BenchmarkDotNet\Demo01\bin\Release\net6.0\03bf0209-ac26-4de1-b763-4ba03e46cf4d // command took 4.29s and exited with 0 // ***** Done, took 00:00:07 (7.52 sec) ***** // Found 2 benchmarks: // Cycle.DapperTest: DefaultJob // Cycle.CommandTest: DefaultJob// ************************** // Benchmark: Cycle.DapperTest: DefaultJob // *** Execute *** // Launch: 1 / 1 // Execute: dotnet "03bf0209-ac26-4de1-b763-4ba03e46cf4d.dll" --benchmarkName "MyBenchmarks.Cycle.DapperTest" --job "Default" --benchmarkId 0 in C:\MyFile\Source\Repos\Asp.NetCoreExperiment\Asp.NetCoreExperiment\BenchmarkDotNet\Demo01\bin\Release\net6.0\03bf0209-ac26-4de1-b763-4ba03e46cf4d\bin\Release\net6.0 // BeforeAnythingElse// Benchmark Process Environment Information: // Runtime=.NET 6.0.0 (6.0.21.25307), X64 RyuJIT // GC=Concurrent Workstation // Job: DefaultJobOverheadJitting 1: 1 op, 229700.00 ns, 229.7000 us/op WorkloadJitting 1: 1 op, 410021000.00 ns, 410.0210 ms/opWorkloadWarmup 1: 1 op, 4581600.00 ns, 4.5816 ms/op WorkloadWarmup 2: 1 op, 746500.00 ns, 746.5000 us/op WorkloadWarmup 3: 1 op, 830000.00 ns, 830.0000 us/op WorkloadWarmup 4: 1 op, 822900.00 ns, 822.9000 us/op WorkloadWarmup 5: 1 op, 741800.00 ns, 741.8000 us/op WorkloadWarmup 6: 1 op, 746900.00 ns, 746.9000 us/op WorkloadWarmup 7: 1 op, 826300.00 ns, 826.3000 us/op WorkloadWarmup 8: 1 op, 698300.00 ns, 698.3000 us/op// BeforeActualRun WorkloadActual 1: 1 op, 755100.00 ns, 755.1000 us/op …… WorkloadActual 100: 1 op, 712700.00 ns, 712.7000 us/op// AfterActualRun WorkloadResult 1: 1 op, 755100.00 ns, 755.1000 us/op …… WorkloadResult 95: 1 op, 712700.00 ns, 712.7000 us/op// AfterAll // Benchmark Process 26724 has exited with code 0Mean = 753.054 us, StdErr = 11.687 us (1.55%), N = 95, StdDev = 113.909 us Min = 578.400 us, Q1 = 668.600 us, Median = 734.900 us, Q3 = 798.800 us, Max = 1,052.600 us IQR = 130.200 us, LowerFence = 473.300 us, UpperFence = 994.100 us ConfidenceInterval = [713.353 us; 792.754 us] (CI 99.9%), Margin = 39.701 us (5.27% of Mean) Skewness = 0.87, Kurtosis = 2.93, MValue = 3.63// ************************** // Benchmark: Cycle.CommandTest: DefaultJob // *** Execute *** // Launch: 1 / 1 // Execute: dotnet "03bf0209-ac26-4de1-b763-4ba03e46cf4d.dll" --benchmarkName "MyBenchmarks.Cycle.CommandTest" --job "Default" --benchmarkId 1 in C:\MyFile\Source\Repos\Asp.NetCoreExperiment\Asp.NetCoreExperiment\BenchmarkDotNet\Demo01\bin\Release\net6.0\03bf0209-ac26-4de1-b763-4ba03e46cf4d\bin\Release\net6.0 // BeforeAnythingElse// Benchmark Process Environment Information: // Runtime=.NET 6.0.0 (6.0.21.25307), X64 RyuJIT // GC=Concurrent Workstation // Job: DefaultJobOverheadJitting 1: 1 op, 215400.00 ns, 215.4000 us/op WorkloadJitting 1: 1 op, 339247500.00 ns, 339.2475 ms/opWorkloadWarmup 1: 1 op, 3680100.00 ns, 3.6801 ms/op WorkloadWarmup 2: 1 op, 943000.00 ns, 943.0000 us/op WorkloadWarmup 3: 1 op, 875200.00 ns, 875.2000 us/op WorkloadWarmup 4: 1 op, 982500.00 ns, 982.5000 us/op WorkloadWarmup 5: 1 op, 956900.00 ns, 956.9000 us/op WorkloadWarmup 6: 1 op, 1030800.00 ns, 1.0308 ms/op WorkloadWarmup 7: 1 op, 1170900.00 ns, 1.1709 ms/op WorkloadWarmup 8: 1 op, 1169400.00 ns, 1.1694 ms/op// BeforeActualRun WorkloadActual 1: 1 op, 975400.00 ns, 975.4000 us/op …… WorkloadActual 100: 1 op, 897400.00 ns, 897.4000 us/op// AfterActualRun WorkloadResult 1: 1 op, 975400.00 ns, 975.4000 us/op …… WorkloadResult 91: 1 op, 897400.00 ns, 897.4000 us/op// AfterAll // Benchmark Process 17300 has exited with code 0Mean = 951.263 us, StdErr = 13.676 us (1.44%), N = 91, StdDev = 130.465 us Min = 759.300 us, Q1 = 864.000 us, Median = 912.900 us, Q3 = 1,004.600 us, Max = 1,316.000 us IQR = 140.600 us, LowerFence = 653.100 us, UpperFence = 1,215.500 us ConfidenceInterval = [904.736 us; 997.789 us] (CI 99.9%), Margin = 46.526 us (4.89% of Mean) Skewness = 0.95, Kurtosis = 3.05, MValue = 2.44// ***** BenchmarkRunner: Finish *****// * Export *BenchmarkDotNet.Artifacts\results\MyBenchmarks.Cycle-report.csvBenchmarkDotNet.Artifacts\results\MyBenchmarks.Cycle-report-github.mdBenchmarkDotNet.Artifacts\results\MyBenchmarks.Cycle-report.html// * Detailed results * Cycle.DapperTest: DefaultJob Runtime = .NET 6.0.0 (6.0.21.25307), X64 RyuJIT; GC = Concurrent Workstation Mean = 753.054 us, StdErr = 11.687 us (1.55%), N = 95, StdDev = 113.909 us Min = 578.400 us, Q1 = 668.600 us, Median = 734.900 us, Q3 = 798.800 us, Max = 1,052.600 us IQR = 130.200 us, LowerFence = 473.300 us, UpperFence = 994.100 us ConfidenceInterval = [713.353 us; 792.754 us] (CI 99.9%), Margin = 39.701 us (5.27% of Mean) Skewness = 0.87, Kurtosis = 2.93, MValue = 3.63 -------------------- Histogram -------------------- [ 545.635 us ; 582.035 us) | @ [ 582.035 us ; 650.935 us) | @@@@@@@@@@@@@@@ [ 650.935 us ; 726.135 us) | @@@@@@@@@@@@@@@@@@@@@@@@@@@ [ 726.135 us ; 791.665 us) | @@@@@@@@@@@@@@@@@@@@@@@@@@@@ [ 791.665 us ; 852.365 us) | @@@@@@@@ [ 852.365 us ; 924.365 us) | @@@ [ 924.365 us ; 1,009.685 us) | @@@@@@@@@@@ [1,009.685 us ; 1,085.365 us) | @@ ---------------------------------------------------Cycle.CommandTest: DefaultJob Runtime = .NET 6.0.0 (6.0.21.25307), X64 RyuJIT; GC = Concurrent Workstation Mean = 951.263 us, StdErr = 13.676 us (1.44%), N = 91, StdDev = 130.465 us Min = 759.300 us, Q1 = 864.000 us, Median = 912.900 us, Q3 = 1,004.600 us, Max = 1,316.000 us IQR = 140.600 us, LowerFence = 653.100 us, UpperFence = 1,215.500 us ConfidenceInterval = [904.736 us; 997.789 us] (CI 99.9%), Margin = 46.526 us (4.89% of Mean) Skewness = 0.95, Kurtosis = 3.05, MValue = 2.44 -------------------- Histogram -------------------- [ 721.230 us ; 780.280 us) | @@ [ 780.280 us ; 860.730 us) | @@@@@@@@@@@@@@@@@@@@ [ 860.730 us ; 936.870 us) | @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ [ 936.870 us ; 1,020.120 us) | @@@@@@@@@@@@@@@@ [1,020.120 us ; 1,080.630 us) | @@@@@ [1,080.630 us ; 1,170.980 us) | @@@@@@@ [1,170.980 us ; 1,247.120 us) | @@@@@@@@ [1,247.120 us ; 1,277.930 us) | [1,277.930 us ; 1,354.070 us) | @ ---------------------------------------------------// * Summary *BenchmarkDotNet=v0.13.0, OS=Windows 10.0.19043.1052 (21H1/May2021Update) Intel Core i7-7700HQ CPU 2.80GHz (Kaby Lake), 1 CPU, 8 logical and 4 physical cores .NET SDK=6.0.100-preview.4.21255.9[Host] : .NET 6.0.0 (6.0.21.25307), X64 RyuJIT [AttachedDebugger]DefaultJob : .NET 6.0.0 (6.0.21.25307), X64 RyuJIT| Method | Mean | Error | StdDev | Median | |------------ |---------:|---------:|---------:|---------:| | DapperTest | 753.1 us | 39.70 us | 113.9 us | 734.9 us | | CommandTest | 951.3 us | 46.53 us | 130.5 us | 912.9 us |// * Warnings * MultimodalDistributionCycle.DapperTest: Default -> It seems that the distribution is bimodal (mValue = 3.63) EnvironmentSummary -> Benchmark was executed with attached debugger MinIterationTimeCycle.DapperTest: Default -> The minimum observed iteration time is 578.4000 us which is very small. It's recommended to increase it to at least 100.0000 ms using more operations.Cycle.CommandTest: Default -> The minimum observed iteration time is 759.3000 us which is very small. It's recommended to increase it to at least 100.0000 ms using more operations.// * Hints * OutliersCycle.DapperTest: Default -> 5 outliers were removed (1.06 ms..2.17 ms)Cycle.CommandTest: Default -> 9 outliers were removed (1.37 ms..2.51 ms)// * Legends *Mean : Arithmetic mean of all measurementsError : Half of 99.9% confidence intervalStdDev : Standard deviation of all measurementsMedian : Value separating the higher half of all measurements (50th percentile)1 us : 1 Microsecond (0.000001 sec)// ***** BenchmarkRunner: End ***** // ** Remained 0 benchmark(s) to run ** Run time: 00:00:03 (3.12 sec), executed benchmarks: 2Global total time: 00:00:10 (10.65 sec), executed benchmarks: 2 //?*?Artifacts?cleanup?*

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