Here is another situation that you may come across and what to do in order to gather information about it.

The following steps will configure DebugDiag to automatically capture a memory dump of the ASPNET_WP.exe process recycling when it exceeds the memoryLimit.  This only applies to the ASPNET_WP.exe process, so if using w3wp.exe, this doesn't apply. The following event is logged when this occurs:

aspnet_wp.exe xxx was recycled because memory 
consumption exceeded 60% of available RAM

Before the issue occurs

A. Download DebugDiag:
====================

1. Install the Debug Diagnostic tool
2. The default installation location for the package is C:\Program Files\DebugDiag. It can be changed.
3. Make sure any other monitoring and debugging tools are not running.

B. Create a Performance Monitor log:
====================================

1. Expand Performance Logs and Alerts
2. Right Click on Counter Logs
3. Choose New Log Settings...
4. Enter a descriptive name
5. Note the log file location for later (or go to the Log Files tab and change the location)
6. Click the Add button
7. Click the All Counters and All Instances radio buttons
8. Select the following from the Performance Object dropdown, being sure to Add each one as you select it:
   • Process
   • Thread
   • Processor
   • Memory
   • .NET CLR Data
   • .NET CLR Exceptions
   • .NET CLR Interop
   • .NET CLR Jit
   • .NET CLR Loading
   • .NET CLR LocksAndThreads
   • .NET CLR Memory
   • .NET CLR Networking
   • .NET CLR Remoting
   • .NET CLR Security
   • ASP.NET
   • ASP.NET Applications
9. Click Close
10. Click OK

For the ASP.NET counters, select the version that you are wanting to monitor. Ex. For 1.1 framework, select ASP.NET v1.1.4322 and ASP.NET Applications v1.1.4322.

Note: For more information on Performance monitor, see KB 248345

C. Configure server for the High Memory Event
==================================

Add the following registry keys. These were added to the .NET Framework so that a breakpoint exception will be thrown when the process recycles due to the above event.

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\ASP.NET
DWord: DebugOnHighMem
Value: 1

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\ASP.NET
DWord: UnderDebugger
Value: 0

C. Configure DebugDiag
===================

Configure DebugDiag to capture the memory dump when the BreakPoint Exception is thrown and when the process stops.

1. Open DebugDiag
2. On the Rules tab, click Add Rule
3. Select Crash and click Next
4. Select All IIS Processes and click Next
5. Click Advanced Exception Configuration
6. Click Add Exception
7. Select Breakpoint Exception, change Action Type to Full UserDump
8. Click OK
9. Click Save and Close
10. Click Advanced Breakpoint Configuration
11. Click Add Breakpoint
12. Type KERNEL32!ExitProcess and change Action Type to Full UserDump
13. Click OK
14. Click Save and Close
15. Click Next through the rest of the wizard

Inject LeakTrack.dll to capture native leak information:

1. Click the Processes tab
2. Right-click the ASPNET_WP.exe process, select Monitor for leaks

After the issue occurs

The memory dump will automatically get captured.

A. Stop the Performance Monitor log
===================================

In Performance Monitor:

1. Right click on your log that is now listed under Counter Logs
2. Choose Stop Log