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This is a project that utilizes the CERN-developed CernVM virtual machine and the BOINC virtualization layer to harness volunteer cloud computing power for full-fledged LHC event physics simulation on volunteer computers.

The theory simulations that have been running as Test4Theory since 2011, were the first of a series of physics applications running on the LHC@home platform. Soon the theory simulations will be followed by more simulations from the LHC experiment collaborations. These applications exploit virtual machine technology, enabling volunteers to contribute to the huge computational task of searching for new fundamental particles and physics at CERN's LHC.

Please visit the LHC@home web site for more documentation, data and instructions. If you have any problem, question or doubt please visit the Message Board, Questions and Answers and FAQ sections of the project.

Join vLHCathome

  • Read our rules and policies
  • Create an account on this page, for this you will need an invitation code. In order to get an invitation code, please check out this post.
  • This project uses BOINC. If you're already running BOINC, select Add Project. If not, download BOINC.
  • When prompted, enter
  • If you're running a command-line version of BOINC, create an account first.
  • If you have any problems, get help here.

User of the day

User profile Profile Michał Obarzanowski
I am a conservator working at National Museum in Krakow, Poland.


Scheduler and vbox update to detect 64-bit enabled computers
The BOINC scheduler has been updated to detect 64 bit machines that do not have the virtualization hardware extensions enabled. Also vboxwrapper has been updated for better error handling, and vboxwrapper 26193 is now deployed for Windows and Linux for the Theory, CMS and LHCb applications. This setup has been tested in our dev project.

Many thanks to Rom Walton for providing these changes to the BOINC code.

Update: As a number of volunteers have reported issues with the latest Theory simulations vboxwrapper 26193, we have disabled this version for now.

The CMS and LHCb applications seem to run fine with the new wrapper.

--The team
21 Jun 2016, 10:56:43 UTC · Comment

CERN Summer Computing Challenge - SOFTWARE STOPPED
The software which supported the CERN Summer Computing Challenges in 2014 and 2015, and continued to run Theory jobs with minimum support, has now been halted due to lack of developer resources for this activity.


Many thanks to all Challenge volunteers who have contributed to this project and helped to explore new Web and CernVM technologies. We do have plans for a new WebAPI system for running multiple vLHC jobs inside a single multi-CPU VM and will announce this in due course.
14 Jun 2016, 10:32:18 UTC · Comment

LHCb beta application published
A new application to simulate Beauty physics at the LHC from the LHCb experiment has now been made available for those accepting beta applications.

Like the CMS application and the 64-bit version of the Theory simulations app, the Beauty simulations require a 64 bit computer with virtualization extensions (VT-x) enabled. Please refer to the instructions in the box on VT-x on the page: http://lhcathome.web.cern.ch/join-us for more information.

Specific discussions on the Beauty simulations can be done in the forum thread dedicated to the LHCb application.

The team.
13 Jun 2016, 13:53:53 UTC · Comment

vlHC Theory Application 64bit upgrade
We have put the new Theory 64bit Application into production today.

Please note the following important changes:

As it is a 64bit application, you must have VT-x / AMD-V acceleration enabled:
- To check this, in your VirtualBox Manager select "Settings -> System -> Acceleration" and make sure that "Enable VT-x/AMD-V" is activated. Also make sure another hypervisor isn't installed or running like KVM or Hyper-V.

For volunteers with 32bit hardware, the legacy 32bit Theory Application will be retained for a while:
- (subject to CoPilot continuing to run on a best-effort basis, as our CoPilot support person has just left CERN).

The CoPilot job scheduler system has been replaced by Condor:
- This enables us to unify both Theory and the LHC experiment applications going forward. (Condor is already implemented in the CMS Application here).

The VM consoles for the new Theory app are:
SCREEN 1: Boot console
SCREEN 2: Job output of running job
SCREEN 3: Linux "top" output
SCREEN 4: Job ID log (Condor and MCPlots)
SCREEN 5: Job error log
SCREEN 6: Login console

The web logs for the new Theory app are:
Parent (home) directory - the standard Test4Theory graphics with links to the other logs:
MasterLog: Condor Master process log
StartLog: Condor Start Daemon log
Starterlog: Condor Starter process log
running.log: Current executing job output file
.. finished_n.log: nth completed job output file
stderr.log: Job error log
stdout.log: Job ID log (Condor and MCPlots)

The team
6 Jun 2016, 9:15:03 UTC · Comment

CMS Jobs Available Again
There was a fault with a server at CERN last night, which meant that we could not submit new CMS jobs, so we ran out.
However, the problem has now been fixed and CMS jobs are available again. Many thanks to the staff who worked Saturday night and Sunday to fix the problem.
5 Jun 2016, 16:49:43 UTC · Comment

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