# Logstash 8.4.2 Extremely High CPU Loading

**URL:** <https://discuss.elastic.co/t/logstash-8-4-2-extremely-high-cpu-loading/315417>\
**Category:** Logstash\
**Created:** [September 29, 2022, 2:14am UTC](https://discuss.elastic.co/t/logstash-8-4-2-extremely-high-cpu-loading/315417 "2022-09-29T02:14:57Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![ivanchak](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ivanchak/32/101755_2.png) [@ivanchak](https://discuss.elastic.co/u/ivanchak)\
**Post date:** [September 29, 2022, 2:14am UTC](https://discuss.elastic.co/t/logstash-8-4-2-extremely-high-cpu-loading/315417/1 "2022-09-29T02:14:57Z")

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My Logstash loading has been about avg. ~10% loading for couple months. Without any change on grokking and configuration, even event/s is about the same rate, just upgrading my Logstash to v8.4.2 causing CPU loading jumped to 90% up constantly.

I have tried to adjust the JVM heap size to be about 65% of the available memory on the server, but it doesn't help. Checked CPU usage per thread with `top -h`, those input threads are what's causing such high usage instead of those GC threads.

Anyone is experience the same thing?

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**Author:** ![leandrojmp](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/leandrojmp/32/107231_2.png) [@leandrojmp](https://discuss.elastic.co/u/leandrojmp)\
**Post date:** [September 29, 2022, 3:30am UTC](https://discuss.elastic.co/t/logstash-8-4-2-extremely-high-cpu-loading/315417/2 "2022-09-29T03:30:06Z")

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> [@ivanchak](#):
>
> just upgrading my Logstash to v8.4.2

Upgraded from which version?

Do you have anything in Logstash logs?

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<div class="post-metadata">

**Author:** ![ivanchak](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ivanchak/32/101755_2.png) [@ivanchak](https://discuss.elastic.co/u/ivanchak)\
**Post date:** [September 29, 2022, 4:26am UTC](https://discuss.elastic.co/t/logstash-8-4-2-extremely-high-cpu-loading/315417/3 "2022-09-29T04:26:50Z")

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From 8.2.2 to 8.4.2.

I don't see any warning nor anything abnormal in Logstash logs. Restarted multiple times.

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<div class="post-metadata">

**Author:** ![ivanchak](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ivanchak/32/101755_2.png) [@ivanchak](https://discuss.elastic.co/u/ivanchak)\
**Post date:** [September 29, 2022, 4:35am UTC](https://discuss.elastic.co/t/logstash-8-4-2-extremely-high-cpu-loading/315417/4 "2022-09-29T04:35:38Z")

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Found couple warnings saying:  
`Received an event that has a different character encoding than you configured. .......... :expected_charset=>"UTF-8""`

Not sure if the above is related.

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [October 27, 2022, 4:35am UTC](https://discuss.elastic.co/t/logstash-8-4-2-extremely-high-cpu-loading/315417/5 "2022-10-27T04:35:39Z")

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