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High CPU usage on linux webserver how to log the hungry process

Posted on 2013-10-29
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Last Modified: 2013-12-16
Hi,

from time to time our webserver is not able to react on http, pop, smtp... because of too high cpu usage for some seconds.
The monitoring of those services shows me that they are off for some seconds.

Is there any script existing, that logs hte outpout of the command "top" or something else, if the cpu-usage gets higher than a given value ?
Or do you have any idea how get to know what is wrong in those seconds ?

It a suse 11 system with normally 1-2 % cpu usage...

Thanks
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Question by:loosain
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Daniel Helgenberger earned 2000 total points
ID: 39610381
from time to time
I can only give you some tips. Please provide more info.

You need to find a pattern:
1. Does this happen regularly, always at the same time, day of the week; so you can tell in advance
2. Does this last long, say several minutes
3. Can you trace this in the logs therefore?

This can for instance be a cron job, doing some heavy lifting (backups?) or a network interface shutdown/restart; eg. a driver issue; or the literal cleaning lady with her vacuum cleaner.
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by:loosain
ID: 39721857
I found out, that the Backup-Job sometimes made a high cpu-usage while using gzip...
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