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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(duì)實(shí)現(xiàn)同一功能的兩種方式，猶豫不決時(shí)，可以使用它進(jìn)行個(gè)對(duì)比。

比如我們比較ADO.NET方式查詢數(shù)據(jù)庫表，和用Dapper方式獲取數(shù)據(jù)為表，只需要在兩個(gè)方法上增加 [Benchmark]就可以了，然后調(diào)用var summary = BenchmarkRunner.Run<Cycle>();就實(shí)現(xiàn)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(yùn)行一下看一下結(jié)果，為了減少篇幅，刪除了一些結(jié)果，從結(jié)果看出，為了得到較為客觀的性能測試結(jié)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(gè)表格，清楚的給出了結(jié)果。同時(shí)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: DefaultJob
OverheadJitting  1: 1 op, 229700.00 ns, 229.7000 us/opWorkloadJitting  1: 1 op, 410021000.00 ns, 410.0210 ms/op
WorkloadWarmup   1: 1 op, 4581600.00 ns, 4.5816 ms/opWorkloadWarmup   2: 1 op, 746500.00 ns, 746.5000 us/opWorkloadWarmup   3: 1 op, 830000.00 ns, 830.0000 us/opWorkloadWarmup   4: 1 op, 822900.00 ns, 822.9000 us/opWorkloadWarmup   5: 1 op, 741800.00 ns, 741.8000 us/opWorkloadWarmup   6: 1 op, 746900.00 ns, 746.9000 us/opWorkloadWarmup   7: 1 op, 826300.00 ns, 826.3000 us/opWorkloadWarmup   8: 1 op, 698300.00 ns, 698.3000 us/op
// BeforeActualRunWorkloadActual   1: 1 op, 755100.00 ns, 755.1000 us/op……WorkloadActual  100: 1 op, 712700.00 ns, 712.7000 us/op
// AfterActualRunWorkloadResult   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 0
Mean = 753.054 us, StdErr = 11.687 us (1.55%), N = 95, StdDev = 113.909 usMin = 578.400 us, Q1 = 668.600 us, Median = 734.900 us, Q3 = 798.800 us, Max = 1,052.600 usIQR = 130.200 us, LowerFence = 473.300 us, UpperFence = 994.100 usConfidenceInterval = [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: DefaultJob
OverheadJitting  1: 1 op, 215400.00 ns, 215.4000 us/opWorkloadJitting  1: 1 op, 339247500.00 ns, 339.2475 ms/op
WorkloadWarmup   1: 1 op, 3680100.00 ns, 3.6801 ms/opWorkloadWarmup   2: 1 op, 943000.00 ns, 943.0000 us/opWorkloadWarmup   3: 1 op, 875200.00 ns, 875.2000 us/opWorkloadWarmup   4: 1 op, 982500.00 ns, 982.5000 us/opWorkloadWarmup   5: 1 op, 956900.00 ns, 956.9000 us/opWorkloadWarmup   6: 1 op, 1030800.00 ns, 1.0308 ms/opWorkloadWarmup   7: 1 op, 1170900.00 ns, 1.1709 ms/opWorkloadWarmup   8: 1 op, 1169400.00 ns, 1.1694 ms/op
// BeforeActualRunWorkloadActual   1: 1 op, 975400.00 ns, 975.4000 us/op……WorkloadActual  100: 1 op, 897400.00 ns, 897.4000 us/op
// AfterActualRunWorkloadResult   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 0
Mean = 951.263 us, StdErr = 13.676 us (1.44%), N = 91, StdDev = 130.465 usMin = 759.300 us, Q1 = 864.000 us, Median = 912.900 us, Q3 = 1,004.600 us, Max = 1,316.000 usIQR = 140.600 us, LowerFence = 653.100 us, UpperFence = 1,215.500 usConfidenceInterval = [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.csv  BenchmarkDotNet.Artifacts\results\MyBenchmarks.Cycle-report-github.md  BenchmarkDotNet.Artifacts\results\MyBenchmarks.Cycle-report.html
// * Detailed results *Cycle.DapperTest: DefaultJobRuntime = .NET 6.0.0 (6.0.21.25307), X64 RyuJIT; GC = Concurrent WorkstationMean = 753.054 us, StdErr = 11.687 us (1.55%), N = 95, StdDev = 113.909 usMin = 578.400 us, Q1 = 668.600 us, Median = 734.900 us, Q3 = 798.800 us, Max = 1,052.600 usIQR = 130.200 us, LowerFence = 473.300 us, UpperFence = 994.100 usConfidenceInterval = [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: DefaultJobRuntime = .NET 6.0.0 (6.0.21.25307), X64 RyuJIT; GC = Concurrent WorkstationMean = 951.263 us, StdErr = 13.676 us (1.44%), N = 91, StdDev = 130.465 usMin = 759.300 us, Q1 = 864.000 us, Median = 912.900 us, Q3 = 1,004.600 us, Max = 1,316.000 usIQR = 140.600 us, LowerFence = 653.100 us, UpperFence = 1,215.500 usConfidenceInterval = [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 *MultimodalDistribution  Cycle.DapperTest: Default -> It seems that the distribution is bimodal (mValue = 3.63)Environment  Summary -> Benchmark was executed with attached debuggerMinIterationTime  Cycle.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 *Outliers  Cycle.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 measurements  Error  : Half of 99.9% confidence interval  StdDev : Standard deviation of all measurements  Median : 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: 2
Global total time: 00:00:10 (10.65 sec), executed benchmarks: 2// * Artifacts cleanup *

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