Please help

Huynh Anh Dung dungha at
Sat Apr 30 05:51:35 CEST 2016

I do follow exact with the help file and I do up to:
-Install the necessary packages: # apt-get install libcgroup-dev (or # yum install libcgroup-devel on RedHat)
- Edit grub config to add memory cgroup and swap accounting to the boot options. Edit /etc/default/grub and change the default commandline to GRUB_CMDLINE_LINUX_DEFAULT="quiet cgroup_enable=memory swapaccount=1". Then run update-grub and reboot.
-Compile DOMjudge with cgroup support. Re-run ./configure and look for cgroup in the output. 
How to rebuild : Then rebuild the runguard with make build. I only make all after re-run ./configure
Upto that point, then I run ./judgedaemon
Then I said no cgroup

Lec. Huỳnh Anh Dũng

-----Original Message-----
From: Jaap Eldering [mailto:jaap at] 
Sent: Saturday, April 30, 2016 10:45 AM
To: Huynh Anh Dung <dungha at>; domjudge-devel at
Subject: Re: Please help

On 30-04-16 00:28, Huynh Anh Dung wrote:
> Hi,
> I do install Cgroup follow but when I run ./judgedaemon it said "Not using cgroup"
> help

When you (re)ran configure did it say that cgroups were enabled?

Did you recompile and reinstall runguard (or the whole judgehost installation)?


> -----Original Message-----
> From: Jaap Eldering [mailto:jaap at]
> Sent: Saturday, April 30, 2016 7:37 AM
> To: Huynh Anh Dung <dungha at>
> Subject: Re: Please help
> On 29-04-16 21:26, Huynh Anh Dung wrote:
>> Hi Jaap,
>> Can you look at 2 lines :
>> # exec java -client -Xss8m -Xmx${MEMLIMITJAVA}k -DONLINE_JUDGE=1 -DDOMJUDGE=1 '$MAINCLASS'
>> exec java -client  -Xmx3g -DONLINE_JUDGE=1 -DDOMJUDGE=1 '$MAINCLASS'
>> before you change and  successfully run, I already change.
> I recommend not to change it like that: then if you change the configured global memory limit, it will not affect Java submissions.
> Also, if you now reduce the memory limit below 3 GB, then java submissions will automatically crash because the JVM is trying to allocate more memory than is allowed by DOMjudge. NOTE: DOMjudge imposes the memory limit onto the whole Java VM, that's why this this whole MEMRESERVED variable is needed in the first place.
> Jaap
> P.S. If you have further questions, please return to using the mailinglist.

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