What is LHC@home?

This a volunteer computing project that uses Internet-connected computers to advance Particle and Accelerator Physics. Participate by downloading and running a free program on your computer. By default, you can run the classic LHC@home application Sixtrack, for simulations of accelerator physics, and help researchers at CERN to improve the LHC.

Other LHC@home simulations that utilizes virtualization to run applications for Theory and experiment simulations for ATLAS, CMS and LHCb are also available.

Please note that some of the applications on LHC@home requre Virtual Box to be installed. Please visit the LHC@home information site for more information. If you have any problems or questions please visit the Message Boards, Questions and Answers and FAQ.

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User of the Day

User profile Profile David Duvall
My name is David Duvall and I'm from the City of Columbia, State of Missouri, United States of America. With more than a dozen computers and a couple...


Downtime Wednesday morning
The LHC@home servers will be down tomorrow Wednesday 11th of March from 6AM to 8AM UTC due to a database intervention.

Hence your BOINC clients may defer uploads or downloads. Thanks for your patience and happy crunching!
10 Mar 2020, 6:54:23 UTC · Discuss

LHC@home web site upgrade
The LHC@home information site on Drupal that includes the FAQ and other information about the applications running on LHC@home is being upgraded now.

Hence links to the FAQ and other information pages about LHC@home will be unavailable for a while today.

The new site will be ready later this afternoon.

-- The team
6 Mar 2020, 10:43:15 UTC · Discuss

CMS@Home -- ongoing problems
Sorry that the CMS@Home HTCondor server is still playing up. Again over the weekend it refused to serve jobs even though plenty were available. Together with Federica we've decided not to inject another workflow this week, to let if "fail hard" again so that she can investigate which ClassAd preferences are not being met.
So, you will probably see the number of running jobs falling, and the number of errors increasing, in the next few days. Please feel free to set No New Tasks in that case. I won't, so that there is still some pressure for jobs on the server. I've also asked Laurence if I can run the CMS@Home VM outside of BOINC, to get around the quota back-off problem.
19 Feb 2020, 14:07:10 UTC · Discuss

CMS@Home up again
OK, jobs are available again. Sorry for the long delay. Remember, I'm only the front-man for a larger crew, so any downstream delays percolate up to my response. Hopefully this will remain good for some time, but I still don't understand why the condor server occasionally refuses to send out jobs in a timely manner.
12 Feb 2020, 11:14:38 UTC · Discuss

CMS@Home accidentally shut down -- Please set No New Tasks
We need to upgrade the CMS@Home WMAgent before Thursday, so I tried to set the workflows to drain down. Unfortunately, I misunderstood the batch states and killed off most of them instead. :-(. There's one still left with about 200 jobs, so that won't last long.
Please set your CMS projects to No New Tasks to avoid getting lots of computation errors. I'll let you know when the upgrade is done and jobs are flowing again.
10 Feb 2020, 15:33:39 UTC · Discuss

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