As we know for applications running in production Debug should never be set to true which will casue performance issue.

• The compilation of ASP.NET pages takes longer (since some batch optimizations are disabled)
• Code can execute slower (since some additional debug paths are enabled)
• Much more memory is used within the application at runtime
• Scripts and images downloaded from the WebResources.axd handler are not cached
• ASP.NET Timeouts

For more impact we can refer to document Don’t run production ASP.NET Applications with debug=”true” enabled ASP.NET Memory: If your application is in production… then why is debug=true

However the command finddebugtrue and finddebugmodules do not work and we will get below information:

0:027> !psscor4.finddebugtrue Loading the heap objects into our cache. The garbage collector data structures are not in a valid state for traversal. It is either in the “plan phase,” where objects are being moved around, or we are at the initialization or shutdown of the gc heap. Commands related to displaying, finding or traversing objects as well as gc heap segments may not work properly. !dumpheap and !verifyheap may incorrectly complain of heap consistency errors. Error requesting GC Heap data Unable to build snapshot of the garbage collector state No Runtimes have debug=true Total 0 HttpRuntime objects

0:027> !psscor4.finddebugtrue No Runtimes have debug=true Total 0 HttpRuntime objects

So how can we identify it in a memory dump?

We can use netext extension instead of psscor4. With netext extension, we can use wruntime to dump http runtime information as active requests and app domain id and wmodule to Dump all modules in process which can be filtered by name, company, debug mode, etc.

Below is help information for wruntime and wmodule. Before we use these two command, we should index and dump managed heap types enabling tree view and to save index in disk with command windex.

0:006> !whelp wruntime Dump all active Http Runtime information This is equivalent to this command:

!wfrom -nospace -nofield -type System.Web.HttpRuntime where ((!_beforeFirstRequest) || _shutdownReason) "\n=========================================================================\n","Address         : ",$addr(),"\nFirst Request   : ",$tickstodatetime(_firstRequestStartTime.dateData),"\nRuning Time     : ",$tickstotimespan($now() - _firstRequestStartTime.dateData),"\nApp Pool User   : ",_wpUserId,"\nTrust Level     : ",_trustLevel,"\nApp Domnain Id  : ",_appDomainId,"\nDebug Enabled   : ",$if(_debuggingEnabled,"True (Not recommended in production)","False"),"\nActive Requests : ",_activeRequestCount,"\nPath            : ",_appDomainAppPath,$if(_isOnUNCShare," (in a share)"," (local disk)"),"\nTemp Folder     : ",_tempDir,"\nCompiling Folder: ",_codegenDir,"\nShutdown Reason : ",$if(_shutdownReason,$enumname(_shutdownReason)+" at "+$tickstodatetime(_lastShutdownAttemptTime.dateData),"Not shutting down"),"\n\n",$if(_shutdownReason,_shutDownMessage+"n"+_shutDownStack,"")

Syntax:

!wruntime

Examples:

Dumps all Active Http Runtime

0:00>!wruntime

========================================================================= Address : 000000011F7244F0 First Request : 7/23/2014 5:13:36 PM Runing Time : 00:03:14 App Pool User : CONTOSO\serv_account Trust Level : Full App Domnain Id : /LM/W3SVC/8989/ROOT/Services/2013v3-1-130506092168812411 Debug Enabled : True (Not recommended in production) Active Requests : 0n0 Path : G:\Internet\wwwroot\contoso\Services\ (local disk) Temp Folder : C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files Compiling Folder: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\contoso_Services\998f0bec\b158a7c7 Shutdown Reason : HostingEnvironment at 7/23/2014 5:25:41 PM

Directory rename change notification for ‘G:\Internet\wwwroot\contoso\Services'. Services dir change or directory rename HostingEnvironment initiated shutdown HostingEnvironment caused shutdownn at System.Environment.GetStackTrace(Exception e, Boolean needFileInfo) at System.Environment.get_StackTrace() at System.Web.Hosting.HostingEnvironment.InitiateShutdownInternal() at System.Web.HttpRuntime.ShutdownAppDomain(String stackTrace) at System.Web.HttpRuntime.OnCriticalDirectoryChange(Object sender, FileChangeEvent e) at System.Web.FileChangesMonitor.OnSubdirChange(Object sender, FileChangeEvent e) at System.Web.DirectoryMonitor.FireNotifications() at System.Web.Util.WorkItem.CallCallbackWithAssert(WorkItemCallback callback) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx) at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem() at System.Threading.ThreadPoolWorkQueue.Dispatch() at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback()

---

0:006> !whelp wmodule Dump modules filtered by type or pattern.

The types are:

• Not from Microsoft
• Managed only
• Compiled in debug mode (managed code only)

Syntax:

!wmodule [-debug] [-managed] [-noms] [-order] [-fullpath] [-name ] [-company ] [-saveto ]

Where:

• debug Lists only managed modules compiled in debug mode. Optional
• managed Lists only managed modules. Optional
• noms Lists modules which are not from Microsoft (it may contain false positives). Optional
• order The output will be sorted by name. Optional
• fullpath It includes the full path to the modules. Optional
• name List only modules matching the pattern (e.g -name Contoso.MyLibrary*). Optional
• company List only modules from the company in the pattern (e.g -company TailsSpin*). Optional
• saveto When present it will save the selected module to an existing folder (e.g. -saveto c:\my mods\). Optional. Must be at the end.

Note: -saveto must be the last parameter. Do not use quotes. Examples: -----------------------------------

Dumps all modules containing ‘mscor’

0:000> !wmodule -name mscor* -fullpath Address Module Version Company Name Debug Mode Type Module Binary 00007fff1c590000 4.6.127.1 Microsoft Corporation No CLR C:\Windows\assembly\NativeImages_v4.0.30319_64\mscorlib\88c60510e9a0b668a5a8e270dba0dfcf\mscorlib.ni.dll 00007fff1f830000 4.6.79.0 Microsoft Corporation No NAT C:\Windows\Microsoft.NET\Framework64\v4.0.30319\mscoreei.dll 00007fff1f8d0000 10.0.10240.16384 Microsoft Corporation No NAT C:\Windows\System32\mscoree.dll

3 module(s) listed, 74 skipped by the filters

Dumps all non-Microsoft modules and save to disk

0:000> !wmodule -noms -saveto c:\modules here Saved ‘c:\modules here\NoTrack.dll’ successfully Saved ‘c:\modules here\VanillaService.exe’ successfully Saved ‘c:\modules here\HttpListenerBehavior.dll’ successfully

3 module(s) saved, 0 failed, 74 skipped by the filters