Re: [vserver] throttler script

From: Fiedler Roman <>
Date: Fri 18 Jan 2013 - 08:50:08 GMT
Message-ID: <2ECE9D9EEF1F524185270138AE2326598370D7@S0MSMAIL112.arc.local>

Von: Sandino Araico Sánchez []

>> On 17/01/13 08:25, Phil Parris wrote:
>> Im running into similar issues.  Please provide the script.  One thing i thought about was to change cron source and add in a random sleep.
> I wrote a couple of throttler scripts two years ago for a host with 50 vservers and load >250.
> The ionice-updatedb looks for known I/O consumming processes in the vserver, renices them and puts the most agressive ones in the throttler.
> The throttler script pauses the process for some seconds (depending on the system load) and lets it run for one second. Two methods are avilable SIGSTOP and freezer but I stopped using the freezer on kernels 2.6.32 because some processes used to stay forever in status DN and were impossible to kill until next host server reboot. I have been using the SIGSTOP method since then.

Did you stop only single processes or whole process group/all processes in guest? If you used stopping of single processes: did you observe any problems with parents getting confused when their child got a signal or did not respond to parent/child communication in time?

> I have not tried the freezer on recent 3.x kernels but it might work now. Some minor changes may be needed on the throttler to use /sys/fs/gcroup instead of the older /dev/cgroup...
> You can download all the scripts from
> I have put the ionice.cron in /etc/cron.d but you could also use crontab -e to set the crontab rules on the root user. I run the  ionice-updatedb every minute all day but you might prefer to run it every 3 or 5 minutes and just on known high load hours... it's up to you.
> For the near future I have plans to rewrite the ionice-updatedb script using iotop on context 1 to detect the I/O abusers. I was not able to run iotop on context 1 in the past but some months ago I saw some recipes on this mailing list to make it work so I will give them a try some day.

I might want to use this one for service execution monitoring
Received on Fri Jan 18 08:50:16 2013

[Next/Previous Months] [Main vserver Project Homepage] [Howto Subscribe/Unsubscribe] [Paul Sladen's vserver stuff]
Generated on Fri 18 Jan 2013 - 08:50:16 GMT by hypermail 2.1.8