Suddenly spike in the iis server

Question

Scenario - IIS server running in the production environment. And suddenly CPU spike upto the 85%-95%. It happens frequently within the time duration of 5-15 min time interval. So I need reason for why this is happening and how to resolve this issue.

Answer 1

Hi @Jagadeeskumar Lenin ,

There could be many reasons for CPU spike, and it is difficult to say what is causing the high CPU in your scenario just by checking the description.

First, you need to check whether CPU spike caused by the IIS process? If yes, try to check which app pool is causing the high CPU. You could open the task manager and check which IIS process PID is causing the high CPU. Try to check and match it with the PID in IIS worker process.

Further, you need to check whether there are any steps that leads to high CPU usage.

It could be something in your application itself, it could be any update, or it also could be some configuration issue. There are many other possibilities. To determine the exact cause of the high CPU, you need to capture dumps for the high CPU and analyze them.

Analyzing the dumps is not easy task and you may not be available with the private symbols that needed for the dump analysis. In that situation, it is best to create a support ticket with the Microsoft. Kindly note that Microsoft support is paid service.

A support engineer could help you collect the necessary information and could help you with the dump analysis to know the cause of the issue.

Let me know if you have further questions.

Best Regards,
Deepak

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