Question

I would like to display some memory statistics (working set, GCs etc.) on a web page using the .NET/Process performance counters. Unfortunately, if there are multiple application pools on that server, they are differentiated using an index (#1, #2 etc.) but I don’t know how to match a process ID (which I have) to that #xx index. Is there a programmatic way (from an ASP.NET web page)?

Answer 1

The first hit on Google:

Multiple CLR performance counters appear that have names that resemble ‘W3wp#1’

When multiple ASP.NET worker processes are running, Common Language Runtime (CLR) performance counters will have names that resemble ‘W3wp#1’ or ‘W3sp#2’and so on. This was remedied in .NET Framework 2.0 to include a counter named Process ID in the .NET CLR Memory performance object. This counter displays the process ID for an instance. You can use this counter to determine the CLR performance counter that is associated with a process.

Also KB 281884:

By default, Performance Monitor (Perfmon.msc) displays multiple processes that have the same name by enumerating the processes in the following way:

Process#1 Process#2 Process#3

Performance Monitor can also display these processes by appending the process ID (PID) to the name in the following way:

Process_PID