Please help

Jaap Eldering jaap at jaapeldering.nl
Sat Apr 30 05:56:47 CEST 2016


On 30-04-16 00:51, Huynh Anh Dung wrote:
> Hi,
> 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. 

And did the configure output say that cgroups were enabled?

> How to rebuild : Then rebuild the runguard with make build. I only make all after re-run ./configure

Did you install or copy runguard to the judgehost installation (under
judgehost/bin)? This step is not explicitly listed in the documentation.

Jaap


> Upto that point, then I run ./judgedaemon
> Then I said no cgroup
> Best
> 
> Lec. Huỳnh Anh Dũng
> ACM/ICPC SUPERVISOR
> FPT UNIVERSITY.
> http://www.fpt.edu.vn 
> 
> -----Original Message-----
> From: Jaap Eldering [mailto:jaap at jaapeldering.nl] 
> Sent: Saturday, April 30, 2016 10:45 AM
> To: Huynh Anh Dung <dungha at fpt.edu.vn>; domjudge-devel at domjudge.org
> 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)?
> 
> Jaap
> 
> 
>> -----Original Message-----
>> From: Jaap Eldering [mailto:jaap at jaapeldering.nl]
>> Sent: Saturday, April 30, 2016 7:37 AM
>> To: Huynh Anh Dung <dungha at fpt.edu.vn>
>> 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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