[CentOS] x86_64 server OOM problems after update to 5.3

JohnS jses27 at gmail.com
Mon Apr 13 16:47:59 UTC 2009


On Mon, 2009-04-13 at 10:31 -0400, Rick Barnes wrote:
> Hello,
> 
> Over the weekend, I upgraded one of my servers that runs mysql and pdns
> to 5.3. Previous to the update I have not had an issue form this server.
> But since, I have had mysql die multiple times from oom-killer.
> 
> $ uname -a
> Linux rack2a 2.6.18-128.1.6.el5 #1 SMP Wed Apr 1 09:10:25 EDT 2009
> x86_64 x86_64 x86_64 GNU/Linux
> 
> Unfortunately, the server has been rebooted by others before I have been
> able to look at it while the problem is occurring. But I have found this
> in the logs:
> 
> http://pastebin.centos.org/25553
> 
> Running sar -A:
> 
> http://pastebin.centos.org/25556
> 
> Since the server was rebooted, the amount of swap is used is 0.
> 
> How do I determine what process is/was chewing up the memory on this
> server? What should I be looking for to narrow this down?
> 
> Thanks,
> Rick
---
You found your problem already. MYSQL. There could be something helping
it also. When SQL server begins running out of RAM there could be many
things to blame on it doing so. What actually does mysql do? As in what
do you use it for. Try ps –auxf | grep mysqld. Something else you can
use is "mytop". You can use the below as a script and it works in an
infinite loop or just use the command only. What you need to see is the
running queries.
##################
#!/bin/bash
while [ 1 ]
do
    mysql -N -u root -ppassword -e 'show processlist' |grep -v 'show processlist'
    sleep 2
done
##################

JohnStanley



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