What is LHC@home?

This a research 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.

Join LHC@home

User of the Day

User profile Profile Olivier Fehr
IT and Data Science Specialist and amateur physicist with special interest in particle and astrophysics.


Missing accounts
Due to a too aggressive spam-cleaning campaign (our fault), we have accidentally deleted some valid accounts on Monday. We have restored a backup copy of the BOINC database, and will recover the missing account data.

If you get a message "missing account key" from your BOINC client, you may be affected. We expect that we can fix this later today, once we have verified the data sets. Hence there is no need to register again.

My apologies for this mishap.
13 Dec 2017, 8:46:45 UTC · Discuss

BOINC server update Thursday
We will upgrade the LHC@home web servers to the new BOINC server code with the "Bootstrap" theme on Thursday 7 December. The new style and layout can already be seen on the LHC@home development project..

During the intervention, from 09 UTC on Thursday, there may be intermittent availability of the LHC@home servers, so BOINC clients may back off and try to upload data later.
5 Dec 2017, 9:07:45 UTC · Discuss

Phaseout of legacy site: lhcathomeclassic.cern.ch/sixtrack
LHC@home has been consolidated and uses SSL for communication as mentioned in this thread last year.

Some BOINC clients are still connecting to the old lhcathomeclassic.cern.ch/sixtrack address, that will be phased out soon.

If this is the case for you, please re-attach the project to the current LHC@home URL presented in the BOINC manager. (http://lhcathome.cern.ch will redirect your BOINC client to https://lhcathome.cern.ch/lhcathome )

For those who are still running an old BOINC 6 client, please upgrade to BOINC 7.2 or later. (The current BOINC client releases are 7.6.33 or 7.8.)

Many thanks for your contributions to LHC@home!
29 Sep 2017, 13:50:32 UTC · Discuss

CMS jobs unavailable Weds 27th September
An upgrade to the CMS@Home workflow management system (WMAgent) is planned for tomorrow (Wed Sep 27th). This needs the current batch of jobs to be stopped so that the queue is empty. I plan to do this about 0700-0800 UTC on Wednesday.
To avoid "error while computing" task failures and the resulting back-off of your daily quotas, we suggest you set all your CMS machines to No New Tasks at least 12 hours beforehand to allow current tasks to time out in the normal way. You can stop BOINC once all your tasks are finished, if you wish.
Exactly how long the intervention will take is unclear, and there will be a delay of up to an hour to get a new batch of jobs queued afterwards. I will post here when jobs are available again, hopefully before the end of the day European time.
26 Sep 2017, 12:23:21 UTC · Discuss

Possible systems failures
We seem to be in the early stages of a system failure for several sub-projects. The proxy server has flatlined and my running jobs monitor is dipping alarmingly. Please check if you are getting tasks flagged as computing failures, and set No New Tasks if so.
[Edit] On closer inspection, it may just be the CMS app. [/Edit]
Obviously I'll apologise if this is a false alarm, but it's the wrong time of day to expect a prompt response from the CERN admins.
18 Sep 2017, 22:00:28 UTC · Discuss

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