# 100% CPU usage on one core

**URL:** <https://community.openhab.org/t/100-cpu-usage-on-one-core/38566>\
**Category:** Runtime\
**Tags:** cpu\
**Created:** [January 10, 2018, 3:15pm UTC](https://community.openhab.org/t/100-cpu-usage-on-one-core/38566 "2018-01-10T15:15:29Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![maciekish](https://community.openhab.org/user_avatar/community.openhab.org/maciekish/32/73014_2.png) [@maciekish](https://community.openhab.org/u/maciekish)\
**Post date:** [January 10, 2018, 3:15pm UTC](https://community.openhab.org/t/100-cpu-usage-on-one-core/38566/1 "2018-01-10T15:15:29Z")

</div>

Hi,  
I’m running Openhab 2.2 on Ubuntu 16.04 installed via OpenHABian script. The only thing constantly running is iCloud location synchronization every 5 mintues yet one of the Openhab Java processes are using 100% CPU. Frontail (events.log and openhab.log) only shows activity every ~5 minutes. How can i figure out what it is doing?

Thanks  
Maciej

 ![cpu](https://community-openhab-org.s3.dualstack.eu-central-1.amazonaws.com/original/3X/7/4/74d89849ea3373f417ec56366604575f84b97199.jpeg)

---

<div class="post-metadata">

**Author:** ![mstormi](https://community.openhab.org/user_avatar/community.openhab.org/mstormi/32/55857_2.png) [@mstormi](https://community.openhab.org/u/mstormi)\
**Post date:** [January 10, 2018, 3:36pm UTC](https://community.openhab.org/t/100-cpu-usage-on-one-core/38566/2 "2018-01-10T15:36:03Z")

</div>

Ramp up [openhab logging](https://docs.openhab.org/administration/logging.html).  
Possibly you (or something) is changing an items or rules file often, each touch or save causes a reprocessing run.