# 100% cpu usage with no database load

**URL:** https://forums.percona.com/t/100-cpu-usage-with-no-database-load/1841
**Category:** Other MySQL® Questions
**Created:** [July 8, 2012, 7:18am UTC](https://forums.percona.com/t/100-cpu-usage-with-no-database-load/1841 "2012-07-08T07:18:44Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![nite23](https://avatars.discourse-cdn.com/v4/letter/n/90ced4/32.png) [@nite23](https://forums.percona.com/u/nite23)
#### Post date: [July 8, 2012, 7:18am UTC](https://forums.percona.com/t/100-cpu-usage-with-no-database-load/1841/1 "2012-07-08T07:18:44Z")

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Hello.

I have Percona Server 5.5.24 on a Centos 6 server, installed from percona yum repository, and I noticed that suddenly mysqld started consuming 100% CPU.  
There is nothing shown in the processlist, in fact, this issue remains even if I disconnect database from all client applications.  
I set up a slave on another server for backups, and it is affected with the same issue.  
Also I noticed a high number of timer0 and timer1 interrupts that coincide with cpu load increase. Graph is attached.

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### Author: ![nite23](https://avatars.discourse-cdn.com/v4/letter/n/90ced4/32.png) [@nite23](https://forums.percona.com/u/nite23)
#### Post date: [July 8, 2012, 7:22am UTC](https://forums.percona.com/t/100-cpu-usage-with-no-database-load/1841/2 "2012-07-08T07:22:24Z")

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…here’s the graph of CPU usage

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### Author: ![gmouse](https://avatars.discourse-cdn.com/v4/letter/g/b9e5f3/32.png) [@gmouse](https://forums.percona.com/u/gmouse)
#### Post date: [July 9, 2012, 6:09am UTC](https://forums.percona.com/t/100-cpu-usage-with-no-database-load/1841/3 "2012-07-09T06:09:26Z")

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You haven’t restarted mysqld? Look at ‘show innodb status’, maybe you can see which background process is busy. Also try if you can get a trace.