Should I set asp net application pool to auto recycle


When developing an ASP.NET application, one important consideration is whether to set the ASP.NET application pool to auto recycle. This can have a significant impact on the performance and stability of your application. In this article, we will explore the benefits and drawbacks of enabling auto recycling and provide examples to help you make an informed decision.

What is ASP.NET Application Pool?

Before diving into the auto recycling feature, let's first understand what an ASP.NET application pool is. An application pool is a that holds one or more ASP.NET applications. It provides a dedicated runtime for each application, isolating them from one another. This isolation helps prevent one application from affecting the performance or stability of others.

What is Auto Recycling?

Auto recycling is a feature in ASP.NET that automatically restarts the application pool under certain conditions. These conditions can include reaching a memory threshold, encountering a certain number of application , or after a specific time interval. The purpose of auto recycling is to free up system resources, release memory leaks, and ensure the application remains responsive.

Benefits of Auto Recycling

Enabling auto recycling can provide several benefits for your ASP.NET application:

  • Performance: Auto recycling helps release memory and resources, preventing the application from becoming sluggish or unresponsive.
  • Memory Leak Detection: By setting a memory threshold, auto recycling can detect and address memory leaks, ensuring the application's stability.
  • Error Recovery: Auto recycling can automatically the application pool in case of critical errors, reducing downtime and improving the user experience.

Drawbacks of Auto Recycling

While auto recycling offers several benefits, it also has some drawbacks that you should consider:

  • Temporary Performance Impact: When the application pool recycles, may be a temporary performance impact as the application needs to restart and .
  • Session Loss: If your application relies heavily on session state, enabling auto recycling may result in session loss, affecting user experience.
  • Delayed Error Detection: Auto recycling may delay the detection of critical errors, as the application pool restarts only when certain conditions are met.

Example: Enabling Auto Recycling

To enable auto recycling in your ASP.NET application, you can modify the application pool in the web.config file. Here's an example:


In this example, we set the maximum memory threshold to 200 MB. Once the application's memory usage exceeds this threshold, the application pool will automatically recycle.


Deciding whether to set the ASP.NET application pool to auto recycle is an important consideration for any ASP.NET developer. While auto recycling can improve performance, detect memory leaks, and recover from errors, it may also introduce temporary performance impacts and session loss. By weighing the benefits and drawbacks and considering the specific requirements of your application, you can make an informed decision on whether to enable auto recycling.

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