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I am getting a spike in network utilisation on my ec2 micro instance at a specific time each day.

Using atop, I found that it is the daily cron that causes the problem:

PID RDDSK WRDSK WCANCL DSK CMD 1/5
722 3420K 4K 0K 98% cron

But I have 13 items in my daily cron, so how do I go about narrowing down which one is the problem?

(The problem might be logrotate, but although it runs daily I have set it to flush the logs weekly, so I don't expect it to cause a problem.)

z c
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    Watch your cron logs and see what job is running. – EEAA Jun 08 '13 at 20:44
  • Where are the cron logs? I am only aware of syslog, which doesn't have anything helpful inside. Syslog only tells me that cron started at a specific time, there's no detail about what scripts were running: Jun 9 06:25:01 ip-00-000-00-000 CRON[10055]: (root) CMD (test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.daily )) – z c Jun 09 '13 at 18:33
  • The title of your question mentions CPU, but you've posted disk statistics. What are you actually after? – jgoldschrafe Jun 13 '13 at 05:25
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    The problem is high read/write to disc, not CPU. It is a problem because I am on EC2 free tier and read/write to disc (io) is charged extra. So my goal is to minimise the read/write if possible but first I need to find out exactly what is doing the read/write. – z c Jun 13 '13 at 12:16

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