Performance Impact with Multiple Threads

This section provides a tutorial example on how to show the performance impact of running multiple threads in a single application.

To find out the performance impact of running multiple threads in a single application, I wrote the following program:

// MultiThread.cs
// Copyright (c) 2015, HerongYang.com, All Rights Reserved.

using System.Threading;
public class MultiThread {
   public static void Main() {
      int count = 32;
      Thread t; 
      for (int n=1; n<=count; n++) {
         t = new Thread(Run);
         t.Start();
         System.Console.WriteLine(System.DateTime.Now.TimeOfDay
            +": Launched thread "+n);
      }
   }
   public static void Run() {
      while(true);
   }
}

I compiled it with .NET 4.6.1 C# compiler, executed it on my Windows 7 system, and got this output:

C:\herong>set "NET=\windows\Microsoft.NET\Framework\v4.0.30319"
C:\herong>%NET%\csc MemoryCrash.cs
Microsoft (R) Visual C# Compiler version 4.6.1055.0

C:\herong>MemoryCrash
C:\herong\cSharp_20100000\cod>MultiThread
15:37:25.1617418: Launched thread 1
15:37:25.1677422: Launched thread 2
15:37:25.1977439: Launched thread 3
15:37:25.2767484: Launched thread 4
15:37:25.3437522: Launched thread 5
15:37:25.4117561: Launched thread 6
15:37:25.5107618: Launched thread 7
15:37:25.6077673: Launched thread 8
15:37:25.7377748: Launched thread 9
15:37:25.8657821: Launched thread 10
...
15:37:32.0201341: Launched thread 30
15:37:32.5021617: Launched thread 31
15:37:32.9831892: Launched thread 32

As a comparison, here is the result from my test with .NET 4.0 on my Windows XP system with "count = 16;".

C:\herong>MultiThread
21:52:46.2343750: Launched thread 1
21:52:46.3437500: Launched thread 2
21:52:46.4687500: Launched thread 3
21:52:46.7656250: Launched thread 4
21:52:47.0781250: Launched thread 5
21:52:47.5468750: Launched thread 6
21:52:48.0156250: Launched thread 7
21:52:48.6406250: Launched thread 8
21:52:49.3437500: Launched thread 9
21:52:50.1406250: Launched thread 10
21:52:50.9218750: Launched thread 11
21:52:51.3750000: Launched thread 12
21:52:52.8750000: Launched thread 13
21:52:54.0156250: Launched thread 14
21:52:55.2031250: Launched thread 15
21:52:56.5781250: Launched thread 16

Some interesting notes on the execution:

Last update: 2015.

Table of Contents

 About This Book

 Introduction of C# (C Sharp)

 Data Type and Variables

 Logical Expressions and Conditional Statements

 Arrays and Loop Statements

 Data Type Features

 Floating-Point Data Types

 Passing Parameters to Methods

 Execution Environment Class

 Visual C# 2010 Express Edition

 Class Features

 C# Compiler and Intermediate Language

 Compiling C# Source Code Files

 MSBuild - Microsoft Build Engine

 Memory Usages of Processes

Multithreading in C#

 What Is Multithreading?

 System.Threading.Thread Class

 Creating and Running Threads

 Threads to Run Instance Methods

Performance Impact with Multiple Threads

 Multi-Thread Programs on Multi-CPU Systems

 Maximum Number of Threads in a Program

 Async Feature from C# 5

 System.IO.FileInfo Class

 System.Diagnostics.FileVersionInfo Class

 WPF - Windows Presentation Foundation

 Partial Classes and Partial Methods

 Outdated Tutorials

 References

 PDF Printing Version