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C# Inline Optimization
Inline statements for speed. Compare ways of inlining statements in this language.Inline optimization. Manually inlining a method body affects performance. Until recently, C# did not provide macros or the inline keyword. But you can always paste in nested function bodies into the enclosing methods. This influences performance.Optimization
Caution: Please consider the AggressiveInlining option built into the .NET Framework before using this approach.
AggressiveInliningExample. In this benchmark program, we test the execution engine performance of the .NET Framework on two different methods: A and B. Method A contains all the necessary operations in its body directly.Benchmark
And: Method B contains another method call (C) that does part of the execution logic.
Then: Main demonstrates the performance difference between the two first methods.
Info: It shows that manually inlining improves performance by about 1.5 nanoseconds per invocation on the test computer.
C# program that benchmarks inlined method
using System;
using System.Diagnostics;
class Program
{
static int A(int v)
{
// This is a single method call.
// ... It contains twenty increments.
v++; v++; v++; v++; v++; v++; v++; v++; v++; v++;
v++; v++; v++; v++; v++; v++; v++; v++; v++; v++;
return v;
}
static int B(int v)
{
// This does ten increments.
// ... Then it does ten more increments in another method.
v++; v++; v++; v++; v++; v++; v++; v++; v++; v++;
v = C(v);
return v;
}
static int C(int v)
{
// This does ten increments.
v++; v++; v++; v++; v++; v++; v++; v++; v++; v++;
return v;
}
static void Main()
{
const int max = 100000000;
int temp1 = 0;
int temp2 = 0;
A(0);
B(0);
C(0);
var s1 = Stopwatch.StartNew();
for (int i = 0; i < max; i++)
{
temp1 = A(i);
}
s1.Stop();
var s2 = Stopwatch.StartNew();
for (int i = 0; i < max; i++)
{
temp2 = B(i);
}
s2.Stop();
Console.WriteLine(s1.Elapsed.TotalMilliseconds * 1000 * 1000 / (double)max);
Console.WriteLine(s2.Elapsed.TotalMilliseconds * 1000 * 1000 / (double)max);
Console.WriteLine("{0} {1}", temp1, temp2);
Console.Read();
}
}
Output
2.236963 (inlined)
3.820417 (regular method)
100000019 100000019
Discussion. In structural programming, developers use routines to organize complex programs. However, computers execute instructions, not routines. Compilers translate methods into series of instructions that operate on the evaluation stack.
And: Unfortunately, these method instructions are pure overhead, at least when they are not required for modularity of design.
Tip: This explains the benefit to inlining methods. The just-in-time compiler inlines certain methods, but typically only small ones.
The AggressiveInlining option is available in .NET 4.5. Microsoft works continually to make C# faster. And this continually invalidates my articles. With AggressiveInlining, you can inline methods.
Code Complete. The book Code Complete by Steve McConnell discusses the inline routine optimization. It states that in some languages, such as C++ and C, you can use the inline keyword or macros with #define.
The benchmark in that book shows that inlining a routine in C++ was mildly beneficial, but not beneficial in another language. This optimization makes some programs slower and others faster. You must test it to be certain of its effect.
Summary. We explored inlining methods using a manual optimization technique in the C# language. This technique can explode the complexity of your program. But it can also improve performance in a measurable way.
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- C# Region and endregion
- C# Remove Char From String at Index
- C# Remove Element
- C# Remove HTML Tags
- C# Remove String
- C# Reserved Filenames
- C# return Keyword
- C# Reverse String
- C# Reverse Words
- C# Reverse Extension Method
- C# RichTextBox Example
- C# Right String Part
- C# RNGCryptoServiceProvider Example
- C# ROT13 Method, Char Lookup Table
- C# SelectMany Example: LINQ
- C# Sentinel Optimization
- C# SequenceEqual Method (If Two Arrays Are Equal)
- C# Shift Operators (Bitwise)
- C# Short and ushort Types
- C# Single Method: Get Element If Only One Matches
- C# SingleOrDefault
- C# Singleton Pattern Versus Static Class
- C# Singleton Class
- C# sizeof Keyword
- C# Skip and SkipWhile Examples
- C# Sleep Method (Pause)
- C# Sort Dictionary: Keys and Values
- C# Sort by File Size
- C# Sort, Ignore Leading Chars
- C# Sort KeyValuePair List: CompareTo
- C# Sort Strings by Length
- C# Thread.SpinWait Example
- C# Math.Sqrt Method
- C# stackalloc Operator
- C# StackOverflowException
- C# StartsWith and EndsWith String Methods
- C# Static Array
- C# Static Dictionary
- C# Stopwatch Examples
- C# Stream
- C# StreamReader ReadToEnd Example (Read Entire File)
- C# StreamReader ReadToEndAsync Example (Performance)
- C# StreamReader Examples
- C# StreamWriter Examples
- C# String Append (Add Strings)
- C# String Compare and CompareTo Methods
- C# String Constructor (new string)
- C# string.Copy Method
- C# CopyTo String Method: Put Chars in Array
- C# Empty String Examples
- C# String Equals Examples
- C# String For Loop, Count Spaces in String
- 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