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I have several iis servers setup visibly identically in different environments (Dev/Test/Staging/etc). Within iis, I have an app pool "MyApplicationAppPool" and three web applications running within that app pool: MyApplication1, MyApplication2, MyApplication3.

When I open up perfmon and try to monitor the performance counter instance associated with an application, I can't seem to find all of them. For instance, I can find

\SERVERNAME\ASP.NET Apps v2.0.50727\_LM_W3SVC_1_Root_MyApplication*1* \SERVERNAME\ASP.NET Apps v2.0.50727\_LM_W3SVC_1_Root_MyApplication*3*

But I can't find

\SERVERNAME\ASP.NET Apps v2.0.50727\_LM_W3SVC_1_Root_MyApplication*2*

My Question: What makes these "instance names" show up in perfmon? Why do some applications seem to create an instance name but others don't?

I'm running on IIS6 on Windows Server 2003

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There seems to be a simple answer to this question. The Instance Name does in fact represent a web "application" and each application can be tracked in perfmon separately. If the web application does not have a place in memory at a particular point in time, the instance name will not appear in perfmon. To have it appear, you simply have to make a call to one of the asp.net web pages or services in that application. Subsequently, load the perfmon add counter window and the new instance name will be available. –  rkierner Dec 20 '12 at 15:29

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There seems to be a simple answer to this question. The Instance Name does in fact represent a web "application" and each application can be tracked in perfmon separately. If the web application does not have a place in memory at a particular point in time, the instance name will not appear in perfmon. To have it appear, you simply have to make a call to one of the asp.net web pages or services in that application. Subsequently, load the perfmon add counter window and the new instance name will be available

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