CODEWITHSUNDEEP
iiscpu-usage
Gidi
Gidi

Reputation: 191

iis Cpu is on 95% usage with very little users - on production

I have a web site and I am using iis as my web server. I noticed that on production server, the cpu reaches 95% usage pretty fast with very little users. this behaviour I don't see on my developement server. I am using visual studio to develop and iis as my local web server as well.

Upvotes: 0

Views: 392

Answers (1)

Konrad Kokosa
Konrad Kokosa

Reputation: 16898

How much big traffic you have on production comparing to development server? How their parameters compare? Before starting a deep analysis of the application itself, I would identify all the infrastructure and environmental differences. Sometime such problems happens because of some other software, like antivirus software running in the background...

Nevertheless, because it sounds rather as a application problem, I would first check Event Viewer for errors. Then I would start from monitoring a few Performance Counters to correlate % Processor Time counter with Current Connections, Available Memory, # of Exceps Thrown / sec, % Time in GC and so on. This kind of behavior usually has a reason from the list:

  • excessive loops usage due to some logic error, like calling the same service again and again, trying to load or parse malfunctioned file etc. This can be analyzed with dump analysis (look below).
  • high CPU usage due to Garbage Collector - when memory usage is extensive (or there is a memory leak even) GC may start to consume more and more CPU fighting with the memory shortage. You will see this with memory-related performance counters.
  • a considerable amount of exceptions thrown (for example due to some environmental problems like network unavailability, production data difference) can also consume a lot of CPU. Event Viewer and exception-related performance counters (as they can be handled silently by your application) should be a indicator here.

To further analyze your application, I suggest to make a full memory dump during high CPU usage. You can do that with Debug Diag tool. Please refer this IIS troubleshooting guide for details.

Upvotes: 2

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