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memberInfoCacheCreation MDA

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Note

This article is specific to .NET Framework. It doesn't apply to newer implementations of .NET, including .NET 6 and later versions.

The memberInfoCacheCreation managed debugging assistant (MDA) is activated when a MemberInfo cache is created. This is a strong indication of a program that is making use of resource-expensive reflection features.

Symptoms

A program's working set increases because the program is using resource-expensive reflection.

Cause

Reflection operations that involve MemberInfo objects are considered resource expensive because they must read metadata that is stored in cold pages and in general they indicate the program is using some type of late-bound scenario.

Resolution

You can determine where reflection is being used in your program by enabling this MDA and then running your code in a debugger or attaching with a debugger when the MDA is activated. Under a debugger you will get a stack trace showing where the MemberInfo cache was created and from there you can determine where your program is using reflection.

The resolution is dependent on the objectives of the code. This MDA alerts you that your program has a late-bound scenario. You might want to determine if you can substitute an early-bound scenario or consider the performance of the late bound scenario.

Effect on the Runtime

This MDA is activated for every MemberInfo cache that is created. The performance impact is negligible.

Output

The MDA outputs a message indicating the MemberInfo cache was created. Use a debugger to get a stack trace showing where your program is using reflection.

Configuration

<mdaConfig>
  <assistants>
    <memberInfoCacheCreation/>
  </assistants>
</mdaConfig>

Example

This sample code will activate the memberInfoCacheCreation MDA.

using System;

public class Exe
{
    public static void Main()
    {
        typeof(object).GetMethods();
    }
}

See also