ATLAS@Home is a research project that uses volunteer computing to run simulations of the ATLAS experiment at CERN. You can participate by downloading and running a free program on your computer.

ATLAS is a particle physics experiment taking place at the Large Hadron Collider at CERN, that searches for new particles and processes using head-on collisions of protons of extraordinary high energy. Petabytes of data were recorded, processed and analyzed during the first three years of data taking, leading to up to 300 publications covering all the aspects of the Standard Model of particle physics, including the discovery of the Higgs boson in 2012.

Large scale simulation campaigns are a key ingredient for physicists, who permanently compare their data with both "known" physics and "new" phenomena predicted by alternative models of the universe, particles and interactions. This simulation runs on the WLCG Computing Grid and at any one point there are around 150,000 tasks running. You can help us run even more simulation by using your computer's idle time to run these same tasks.

On this page you can see ATLAS monitoring of the tasks running on ATLAS@Home, as well as how ATLAS@Home ("BOINC") compares to the other sites on the WLCG.

The program you will download runs simulation software inside a virtual machine hosted by your computer. The virtual machine image is ~500MB but is only downloaded once. Each workunit downloads a small set of input data and runs for approx 1 to 2 hours depending on the computer's processor speed.

Please consult or post to the message boards to learn more about the work currently available or in case of problems.

The Physics of ATLAS@Home

No knowledge of particle physics is required, but for those interested in the physics processes simulated in ATLAS@Home as well as the ATLAS experiment itself visit our public page.

ATLAS@Home tasks progress, for each task (number of jobs done/total number of jobs):

  • Task mc15_13TeV 100_165.simul (8559613): 1687/80000
  • Task mc15_13TeV 100_165.simul (8559597): 1984/80000
  • Task mc15_13TeV 100_165.simul (8559575): 3284/80000
  • Task mc15_13TeV 100_165.simul (8559551): 45726/80000
  • Task mc15_13TeV 100_165.simul (8455077): 79824/80000
  • Task mc15_13TeV 100_165.simul (8455038): 77209/80000
  • Task mc15_13TeV 100_165.simul (8455004): 72091/80000
  • Task mc15_13TeV 100_165.simul (8454972): 79829/80000
  • Task mc15_13TeV 100_165.simul (8280910): 79886/80000
  • Task mc15_13TeV 100_165.simul (8280893): 79876/80000
  • Task mc15_13TeV 100_165.simul (8280877): 79884/80000

Join ATLAS@Home

  • Read our rules and policies
  • This project uses BOINC. If you're already running BOINC, select Add Project. If not, download BOINC.
  • This project also requires VirtualBox to be installed.
    • Windows: VirtualBox is included in Windows distributions of Boinc and so does not have to be installed separately.
    • Mac and Linux: VirtualBox must be installed separately
  • After choosing Add Project in Boinc Manager, choose ATLAS@home from the list of projects
  • Then either enter details for to set up a new account, or if you have previously registered enter the existing account details.
    • A reasonably powerful modern 64-bit computer with at least 4GB of memory is required to run ATLAS@Home. Enabling 64-bit virtualisation may require some changes in BIOS settings.
    • In Boinc Manger set the % of processors used to be at most 50%, otherwise your computer may run out of memory.
    • The work units may use a lot of network bandwidth, so a slow internet connection may reduce work unit efficiency
    • The work units contact servers at CERN and outside CERN. If you are behind a firewall you will need to open access to these servers. Please contact us for details.
  • 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 fthibaud0001
25 years in the computing business and now woodworker and shaman Kin 154: WHITE SPECTRAL WIZARD I dissolve in order to enchant Releasing...


Disk space limit decreased to 4GB
Hi all,

To make more effective use of volunteers running ramdisks we have reduced the disk space limit from 6.5GB to 4GB. See thread here

We see that most tasks use at most 2.2GB so this should be safe, but please notify us of any problems related to this change.[/url]
24 Jun 2016, 7:30:30 UTC · Comment

WU running out shortly - more on Monday 6th
Hi all, just a heads up that we will likely run out of WU in the next few hours. We should get some more back in the system on Monday. 4 Jun 2016, 18:23:12 UTC · Comment

ATLAS@Home in CERN Bulletin
ATLAS@Home features in this week's CERN Bulletin (CERN's internal bi-weekly newspaper):

Here you can read about the achievements of ATLAS@Home as well as related LHC@Home projects. Happy reading!
18 May 2016, 10:34:54 UTC · Comment

Can we beat the ATLAS record?
Hi all,

Next week (starting 22 Feb) our ATLAS colleagues in the US will get their hands on 100,000 CPU cores from Amazon EC2 for a few days to run ATLAS simulation. In combination with this we are going to push all the other ATLAS resources we have in order to break the record of concurrent simulation tasks running. Can you guys spread the word around to get people to contribute a bit more to ATLAS@Home next week?

You can see the number of tasks running per site for the last month on this page: (ATLAS@Home is "BOINC"). Thanks in advance for your help!
18 Feb 2016, 9:02:37 UTC · Comment

Short downtime
Dear volunteers,

there will be a short intervention of ATLAS@Home this morning, of about 1 hour, due to the upgrade of the shared filesystem.

Best regards,
9 Feb 2016, 7:57:25 UTC · Comment

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