Skip to main content

Application Pools in IIS

Introduction

 This article describes the concept of application pools and web garden that has been introduced in IIS 6.0. 
I have tried to keep it simple and short, at the same time informative.

 What is an Application Pool?

 IIS can isolate an individual Web application or multiple sites into a self-contained process (called an application pool) that communicates directly with the Operating System kernel.

 What is a Web Garden?

 IIS 6.0 worker process isolation modes also enable multiple worker processes to be configured to service requests for a given application pool. This configuration is known as a Web garden.

 IIS 6.0 Architecture

 The figure below describes the IIS 6.0 architecture in its simplest form. 
Unlike previous versions of IIS, there are multiple processes (application pools) that run independent of each other. The biggest advantage of this (isolation of processes) is, in a shared hosting environment, when one of the web sites goes down because of a heavy load, that doesn't effect the other websites that are running under a different application pool.


Moreover, the IIS 6.0 manager allows you to limit the max memory that can be used by an application pool. It also allows you to configure parameters related to the performance and health of an application pool.

 Advantages of using this feature
  • These self-contained application pools prevent an application or site from disrupting the XML Web Services or other Web applications on the server.
  • OS resource (memory, CPU utilization etc.) allocation.
  • Isolation increases throughput, and increases the capacity of applications.
  • Offers more headroom on servers, which in turn reduces hardware needs.
  • Through web garden and processor affinity, increases throughput and capacity of applications.
Labels:

Comments

Post a Comment

Popular posts from this blog

Accessing File Stored in Windows Azure Blob Storage Using jQuery

Did you know it was possible to access the Windows Azure Blob Storage directly from JavaScript, for example using jQuery? At first, it sounds obvious, since Blobs are after all accessible from a public UR. But in practice, there is a very big hurdle: the Web browser’s Same Origine Policy or SOP, that restricts JavaScript code to accessing resources originating from the same site the script was loaded from. This means that you will never be able to load a Windows Azure Blob using XMLHttpRequest for example! Fortunately, there is a popular workaround called JSONP (“JSON with Padding”). The idea behind this technique is that the script tag is not submitted to the SOP: an HTML page can thus load a JavaScript file from any site. So, if you expose your data in an “executable” form in JavaScript, a page will be able to load this data using a script tag. For example: <script type=”text/javascript” src=”http://www.sandeepknarware.in/exemple.jsonp”> </script> But how can ...
Post a Comment
Read more

Support for debugging lambda expressions with Visual Studio 2015

Anyone who uses LINQ (or lambdas in general) and the debugger will quickly discover the dreaded message “Expression cannot contain lambda expressions”. Lack of lambda support has been a limitation of the Visual Studio Debugger ever since Lambdas were added to C# and Visual Basic.  With visual studio 2015 Microsoft has added support for debugging lambda expressions. Let’s first look at an example, and then I’ll walk you through current limitations. Example To try this yourself, create a new C# Console app with this code: using System.Diagnostics; using System.Linq; class Program { static void Main() { float[] values = Enumerable.Range(0, 100).Select(i => (float)i / 10).ToArray(); Debugger.Break(); } } Then compile, start debugging, and add “values.Where(v => (int)v == 3).ToArray()” in the Watch window. You’ll be happy to see the same as what the screenshot above shows you. I am using Visual Studio 2015 Preview and it has some limitati...
1 comment
Read more

gcAllowVeryLargeObjects Element

There are numerous new features coming with .NET 4.5 and here, on this blog, you can find several posts about it. But the feature we are goint to talk about today is very exciting, because we were waiting for it more than 10 years. Since .NET 1.0 the memory limit of .NET object is 2GB. This means you cannot for example create array which contains elements with more than 2GB in total. If try to create such array, you will get the OutOfMemoryException. Let’s see an example how to produce OutOfMemoryException. Before that Open Visual Studio 2012, and create C# Console Application, like picture below. First lets create simple struct with two double members like example below: 1 2 3 4 5 6 7 8 9 10 11 12 public struct ComplexNumber {      public double Re;      public double Im;      public ComplexNumber( double re, double im)      {    ...
Post a Comment
Read more