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I have a web server: ubuntu apache+php app+postgresql and a stats server: ubuntu apache+php - piwik and munin2 installed.

The communication for munin2 is made through ssh.

In munin i see a lot of system cpu activity, that I assume it it because of apache (i see 5 or 6 apache instances using ~5% CPU on top)

I was not having this system CPU activity before.

Does anyone knows how can I see where that comes from?

EDIT: some munin graphs munjin graphs

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You were not having this system CPU activity befor[e] what? –  womble Jul 2 '12 at 14:26
Leap Second Bug serverfault.com/questions/403732/… ? –  Yohann Jul 2 '12 at 14:29
good question... I don't know really, but I moved piwik to the other server, installed mod_pagespeed, installed curl (php app uses it a little). Maybe I did more thinks, not sure. –  jperelli Jul 2 '12 at 14:30
It might be that leap sec... not sure. I don't fully understand it. I'll attach munin graphs. –  jperelli Jul 2 '12 at 14:40
@Yohann Please make that comment an answer and I will accept it. I finally updated the kernel, rebooted, and it works all ok. Because of the date (as seen on munin graphs) I'll supose that the problem was that leap second. –  jperelli Jul 2 '12 at 15:05

2 Answers 2

up vote 1 down vote accepted

This is considered a bug. See Anyone else experiencing high rates of Linux server crashes during a leap second day?

Upgrading the kernel and restarting the system should solve the problem.

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Check out the TOP command to see system resource utilization.

#man top
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