What are the best ASP.NET performance counters to monitor?

asp.net testing performancecounter
Simon Munro picture Simon Munro · Oct 2, 2008 · Viewed 14k times · Source

There are truckloads of counters available in perfmon for ASP.NET. What are the best (I am thinking of choosing 5-10) that will be the best to monitor in our test environment so that we can feed back to developers.

I am thinking of things like request time, request queue length, active sessions etc.

Answer

Ilya Kochetov picture Ilya Kochetov · Oct 2, 2008

For a normal (not performance/stress testing) you would be OK with the following:

  • Request Bytes Out Total (very important especially for web (not intranet) applications)
  • Requests Failed
  • Requests/Sec
  • Errors During Execution
  • Errors Unhandled During Execution
  • Session SQL Server Connections Total
  • State Server Sessions Active

For the performance testing you would probably want things like:

  • % CPU Utilization (make sure you're checking for very low CPU utilisation as well as it might indicate that something is dead)
  • Requests Queued
  • Output Cache Hits

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