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194 discussions

Kernel Parameter on AWS EC2
by Myungwoo Chun 11 Jul '16

11 Jul '16

Hi, I want to enable cgroups for Java memory issues and running multiple judgedaemons in AWS EC2 Ubuntu 14.04 Server instance. However, I can't add "quiet cgroup_enable=memory swapaccount=1" since AWS EC2 doesn't use grub. Is there any method to add kernel parameters to AWS EC2 instance? Thanks, Myungwoo Chun

3 5

[Domjudge] Selectively allowing languages per problem in a contest
by Ambar Pal 27 Jun '16

27 Jun '16

Hi I am trying to set up a contest where I have 4 languages available for the participants along with say 4 problems. Is it possible to configure domjudge in such a manner such that the partipants can solve Problem 1 only with Language 1, Problem 2 with either Language 1 or Language 2, Problem 3 with only Language 3, and so on. I was initially thinking that per problem run scripts would be the solution for this, but turns out it is not the case. I would highly appreciate any help in this regard. Thanks a lot Ambar Pal

2 1

Domjudge usage statstics
by Aneesh R 27 Jun '16

27 Jun '16

Hi Is there any way to collect domjudge usage statistics Like a)how much data is uploaded by each participants b) how much size is used by each participant in domjudge c) how many users are logged in contest Regards Aneesh

2 2

Code Golf
by Parth Mittal 17 Jun '16

17 Jun '16

Hi We would like to run a code golf challenge on domjudge. Does the judge support custom scoring of this form? (In a code golf challenge, the score is a fraction determined by the length of the program) Regards Parth Mittal

2 1

Re: Please help
by Jaap Eldering 16 Jun '16

16 Jun '16

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@jaapeldering.nl] > Sent: Saturday, April 30, 2016 7:37 AM > To: Huynh Anh Dung <dungha(a)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. >

5 22

import
by Huynh Anh Dung 15 Jun '16

15 Jun '16

Hi Jaap, Do you convenient way to add users, teams, and passwd into domjudge. Do you have sample file. What is account file to import and format of this file. Thanks Lec. Huỳnh Anh Dũng ACM/ICPC SUPERVISOR FPT UNIVERSITY. http://www.fpt.edu.vn -----Original Message----- From: DOMjudge-devel [mailto:domjudge-devel-bounces@domjudge.org] On Behalf Of Jaap Eldering Sent: Saturday, April 30, 2016 8:29 PM To: domjudge-devel(a)domjudge.org Subject: Re: Please help On 30-04-16 01:24, Huynh Anh Dung wrote: > When I run ./configure > checking for cgroup_init in -lcgroup... yes > > * default user........: root > * runguard user.......: domjudge-run > * webserver group.....: www-data > - chroot...........: /chroot/domjudge > - cgroup...........: /cgroup > Up to this stage, I don’t know it is or not enable What I'm looking for is actually the line below "webserver group" that says: * use Linux cgroups...: yes/no But when I logged in to your machine, /root/domjudge-5.1.1/config.log shows that cgroups are disabled. You have the package installed, but have not edited /etc/default/grub, so the kernel doesn't support cgroups yet. As a side note, you should not install DOMjudge as root user. Instead create a separate user to install it as: DOMjudge will use 'sudo' to obtain root privileges only when needed. Jaap >> Did you install or copy runguard to the judgehost installation (under judgehost/bin)? This step is not explicitly listed in the documentation. > Not yet it is not listed in the document Best > > Lec. Huỳnh Anh Dũng > ACM/ICPC SUPERVISOR > FPT UNIVERSITY. > http://www.fpt.edu.vn > > -----Original Message----- > From: DOMjudge-devel [mailto:domjudge-devel-bounces@domjudge.org] On > Behalf Of Jaap Eldering > Sent: Saturday, April 30, 2016 10:57 AM > To: domjudge-devel(a)domjudge.org > Subject: Re: Please help > > 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@jaapeldering.nl] >> Sent: Saturday, April 30, 2016 10:45 AM >> To: Huynh Anh Dung <dungha(a)fpt.edu.vn>; domjudge-devel(a)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@jaapeldering.nl] >>> Sent: Saturday, April 30, 2016 7:37 AM >>> To: Huynh Anh Dung <dungha(a)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. >>> >> >> > > _______________________________________________ > DOMjudge-devel mailing list > DOMjudge-devel(a)domjudge.org > https://www.domjudge.org/mailman/listinfo/domjudge-devel > _______________________________________________ DOMjudge-devel mailing list DOMjudge-devel(a)domjudge.org https://www.domjudge.org/mailman/listinfo/domjudge-devel

2 1

Update compile script
by Hoai-Thu Vuong 14 Jun '16

14 Jun '16

Hi In case adding a new language and compile script for a new language or update compile script of a language, what should I do? I see the source code and domjudge scheme, I found the table "executable" contains some content and md5 of zip files, so that, should I write a command to read content of zip file and calculate md5 then put it into db?

2 3

Judgedaemon binding
by Parth Mittal 06 Jun '16

06 Jun '16

Hi We’re trying to run domserver an judgedaemons on the same machine (a 6 core VM). My plan so far is to use the kernel flag isolcpus to reserve 4 cores for the judgedaemons. My question is that when we bind a judgedaemon using judgedamon -n does it set the affinity to the right mask by itself or do I need to do something? Thanks Parth Mittal PS. I’d also appreciate any alternate approaches that you have in mind.

2 3

Balloons Problem
by Aneesh R 04 Jun '16

04 Jun '16

Hi Team I am using Domjudge 5.0.3 server in AWS ,now i facing balloons color problem i cant provide balloon color for each problems only white color is there. So how can i resolve it Regards Aneesh

4 9

files .txt in domjudge
by Jesús Alberto Domínguez Alfonso 03 Jun '16

03 Jun '16

Hello, i have a sort program, it has files .txt with datas, i upload the .cpp and .txt and later execute with domjudge but i get problems with .txt. how can i use programs with files .txt. regards.

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