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C# Thread.SpinWait Example
Use the SpinWait method from System.Threading. SpinWait causes actual CPU usage.SpinWait. An idle loop uses 100% CPU. It runs for a specified number of iterations in a C# program. With Thread.SpinWait we specify this iteration count. The CPU will max out for the required amount of time for this to complete.Threads
Example. This program uses Thread.SpinWait for one million iterations. It also uses Stopwatch to time how long Thread.SpinWait takes to complete. An argument of 1000000 required about 3 milliseconds to complete on the computer used for testing.Stopwatch
Note: Because SpinWait is computationally intensive, it will complete earlier or later depending on your computer's clock speed.
C# program that uses Thread.SpinWait
using System;
using System.Diagnostics;
using System.Threading;
class Program
{
static void Main()
{
Stopwatch stopwatch = Stopwatch.StartNew();
// CPU is maxed out during this call.
// ... (Try making it much larger to test.)
Thread.SpinWait(1000000);
Console.WriteLine(stopwatch.Elapsed.TotalMilliseconds);
}
}
Output
3.0908
Discussion. There is an interesting use for Thread.SpinWait that I have found during testing. Several years ago I did a ThreadPool experiment. I tried to determine how to adjust the number of threads optimally for a multiple-core machine.
And: When I used Thread.Sleep, the experiment did not involve the CPU and so did not yield correct results.
But: When I used Thread.SpinLock, the results were correct. SpinLock is necessary to simulate actual CPU usage.
ThreadPool.SetMinThreadsSummary. We looked at the Thread.SpinWait method found in the System.Threading namespace in the .NET Framework. If you want to waste electricity and make your computer do a lot of wasteful computations, this method is perfect.
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- C# string.Intern and IsInterned
- C# String IsUpper, IsLower
- C# String Length Property: Get Character Count
- C# String Literal: Newline and Quote Examples
- C# StringBuilder Capacity
- C# StringBuilder Clear (Set Length to Zero)
- C# StringBuilder Data Types
- C# StringBuilder Performance
- C# StringBuilder Equals (If Chars Are Equal)
- C# StringBuilder Memory
- C# StringBuilder ToString: Get String From StringBuilder
- C# StringWriter Class
- C# Sum Method: Add up All Numbers
- C# Switch Char, Test Chars With Cases
- C# Switch Enum
- C# System (using System namespace)
- C# Tag Property: Windows Forms
- C# TextInfo Examples
- C# TextReader, Returned by File.OpenText
- C# TextWriter, Returned by File.CreateText
- C# this Keyword
- C# ThreadPool
- C# Thread Join Method (Join Array of Threads)
- C# ThreadPool.SetMinThreads Method
- C# TimeZone Examples
- C# Get Title From HTML With Regex
- C# ToArray Extension Method
- C# ToCharArray: Convert String to Array
- C# ToDictionary Method
- C# Token
- C# ToList Extension Method
- C# ToLookup Method (Get ILookup)
- C# ToLower and ToUpper: Uppercase and Lowercase Strings
- ToolStripContainer Control: Dock, Properties
- C# ToolTip: Windows Forms
- C# ToString Integer Optimization
- C# ToString: Get String From Object
- C# ToTitleCase Method
- C# TrackBar: Windows Forms
- C# Tree and Nodes Example: Directed Acyclic Word Graph
- C# TreeView Tutorial
- C# Trim Strings
- C# Thread Methods
- C# History
- C# Features
- C# Variables
- C# Data Types
- C# Operators
- C# Keywords
- C# New Features | C# Version Features
- C# Programs
- C# Program to swap numbers without third variable
- C# Program to convert Decimal to Binary
- C# Program to Convert Number in Characters
- C# Program to Print Alphabet Triangle
- C# Program to print Number Triangle
- C# Program to generate Fibonacci Triangle
- C# String Compare() method
- C# String CompareOrdinal() method
- C# String CompareTo() method
- C# String Concat() method
- C# String Contains() method
- C# String CopyTo() method
- C# String EndsWith() method
- C# String Equals() method
- C# String Format() method
- C# String IndexOf() method
- C# String Insert() method
- C# String Intern(String str) method
- C# String IsInterned() method
- C# String Normalize() method
- C# String IsNullOrEmpty() method
- C# String IsNullOrWhiteSpace() method
- C# String Join() method
- C# String LastIndexOf() method
- C# String LastIndexOfAny() method
- C# String PadLeft() method
- C# String PadRight() method
- C# Nullable
- C# String Remove() method
- C# String Replace() method
- C# String Split() method
- C# String StartsWith() method
- C# String SubString() method
- C# Partial Types
- C# Iterators
- C# Delegate Covariance
- C# Delegate Inference
- C# Anonymous Types
- C# Extension Methods
- C# Query Expression
- C# Partial Method
- C# Implicitly Typed Local Variable
- C# Object and Collection Initializer
- C# Auto Implemented Properties
- C# Dynamic Binding
- C# Named and Optional Arguments
- C# Asynchronous Methods
- C# Caller Info Attributes
- C# Using Static Directive
- C# Exception Filters
- C# Await in Catch Finally Blocks
- C# Default Values for Getter Only Properties
- C# Expression Bodied Members
- C# Null Propagator
- C# String Interpolation
- C# nameof operator
- C# Dictionary Initializer
- C# Pattern Matching
- C# Tuples
- C# Deconstruction
- C# Local Functions
- C# Binary Literals
- C# Ref Returns and Locals
- C# Expression Bodied Constructors and Finalizers
- C# Expression Bodied Getters and Setters
- C# Async Main
- C# Default Expression