# Background Thread CPU

**URL:** <https://community.dynatrace.com/t/background-thread-cpu/42519>\
**Category:** Open Q&A\
**Tags:** dynatrace-managed, processes, cpu\
**Created:** [November 8, 2023, 1:52pm UTC](https://community.dynatrace.com/t/background-thread-cpu/42519 "2023-11-08T13:52:51Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![leonatay](https://avatars.discourse-cdn.com/v4/letter/l/b4bc9f/32.png) [@leonatay](https://community.dynatrace.com/u/leonatay)\
**Post date:** [November 8, 2023, 1:52pm UTC](https://community.dynatrace.com/t/background-thread-cpu/42519/1 "2023-11-08T13:52:51Z")

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Hi community,

What is the indication of high background thread CPU (more than 10%) on IIS App Pool&nbsp;.NET v4.5 2 process? What can we suspect from there?

Thanks.

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**Author:** ![radek\_jasinski](https://dub1.discourse-cdn.com/dynatrace/user_avatar/community.dynatrace.com/radek_jasinski/32/10432_2.png) [@radek\_jasinski](https://community.dynatrace.com/u/radek_jasinski)\
**Post date:** [November 8, 2023, 2:06pm UTC](https://community.dynatrace.com/t/background-thread-cpu/42519/2 "2023-11-08T14:06:52Z")

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Hi&nbsp;[@leonatay](https://community.dynatrace.com/user/54817)

The background thread CPU refers to everything that happens outside the monitored request. We can try to create custom services to capture the information that is done there.

Radek

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<div class="post-metadata">

**Author:** ![RazTN7](https://dub1.discourse-cdn.com/dynatrace/user_avatar/community.dynatrace.com/raztn7/32/10208_2.png) [@RazTN7](https://community.dynatrace.com/u/RazTN7)\
**Post date:** [November 8, 2023, 4:29pm UTC](https://community.dynatrace.com/t/background-thread-cpu/42519/3 "2023-11-08T16:29:40Z")

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Hello&nbsp;[@leonatay](https://community.dynatrace.com/user/54817),

Perfmon and DebugDiag, you can collect data that can be helpful in determining the cause of high CPU in application pools.

Once you have confirmed that a w3wp.exe process is experiencing high CPU, you will need to collect the following information in order to determine what is causing the problem:

- A Performance Monitor data collector set.
- A user-mode memory dump of the w3wp.exe process.

Ref -&nbsp;[Troubleshoot High CPU Usage in an IIS Application Pool - Internet Information Services | Microsoft Learn](https://learn.microsoft.com/en-us/troubleshoot/developer/webapps/iis/health-diagnostic-performance/troubleshoot-high-cpu-in-iis-app-pool)

Cheers!

RN