# CPU Usage ArException Task

**URL:** <https://community.br-automation.com/t/cpu-usage-arexception-task/10837>\
**Category:** B&R Software & Runtime\
**Tags:** automation-studio\
**Created:** [April 9, 2026, 2:26pm UTC](https://community.br-automation.com/t/cpu-usage-arexception-task/10837 "2026-04-09T14:26:42Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![c586375](https://avatars.discourse-cdn.com/v4/letter/c/FF8800/32.png) [@c586375](https://community.br-automation.com/u/c586375)\
**Post date:** [April 9, 2026, 2:26pm UTC](https://community.br-automation.com/t/cpu-usage-arexception-task/10837/1 "2026-04-09T14:26:42Z")

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Hello

I checked the CPU usage on our X90 mobile CPU and noticed the following entry:

**ArException – 44%**

Does anyone know why this system task is using so many CPU resources, or is this normal?

Thanks!

Best regards, Robert

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**Author:** ![valerio.manenti](https://dub1.discourse-cdn.com/brcommunity/user_avatar/community.br-automation.com/valerio.manenti/32/11712_2.png) [@valerio.manenti](https://community.br-automation.com/u/valerio.manenti)\
**Post date:** [April 9, 2026, 2:41pm UTC](https://community.br-automation.com/t/cpu-usage-arexception-task/10837/2 "2026-04-09T14:41:28Z")

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maybe I wrong Robert, but the key question should be “Why do you have an ArException in your code?“

Ciao  
Valerio

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**Author:** ![michael.bertsch](https://dub1.discourse-cdn.com/brcommunity/user_avatar/community.br-automation.com/michael.bertsch/32/239_2.png) [@michael.bertsch](https://community.br-automation.com/u/michael.bertsch)\
**Post date:** [April 9, 2026, 2:48pm UTC](https://community.br-automation.com/t/cpu-usage-arexception-task/10837/3 "2026-04-09T14:48:48Z")

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Hello,

The default Profiler setting has little Buffersize. If the Profiler was from an exeption, most of the Bufferentries are filled by the exeption and does not show the normal percentage of operation.

For a real project it is typicaly usefull to increase buffersize of the Profile when doing diagnosis.

if you like you can upload your Profiling and we can have a look to it.

Greetings  
Michael

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**Author:** ![kovarj](https://dub1.discourse-cdn.com/brcommunity/user_avatar/community.br-automation.com/kovarj/32/537_2.png) [@kovarj](https://community.br-automation.com/u/kovarj)\
**Post date:** [April 9, 2026, 3:38pm UTC](https://community.br-automation.com/t/cpu-usage-arexception-task/10837/4 "2026-04-09T15:38:20Z")

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This wiki post can help with profiler configuraiton [How to create a long profiler with enough data for analysis](https://community.br-automation.com/t/how-to-create-a-long-profiler-with-enough-data-for-analysis/493)

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**Author:** ![c586375](https://avatars.discourse-cdn.com/v4/letter/c/FF8800/32.png) [@c586375](https://community.br-automation.com/u/c586375)\
**Post date:** [April 15, 2026, 9:06pm UTC](https://community.br-automation.com/t/cpu-usage-arexception-task/10837/5 "2026-04-15T21:06:27Z")

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Thanks for all the answer.  
I was not aware of any exception when I did the profiling. But I had a lot of exception in the past… 😉  
However, I tried to reproduce the profiling and I don’t see ArException anymore. So I assume that I used the profiler incorrectly and ended up looking at the profile of an exception.

Thank you very much for your help!

Best regards,  
Robert