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 [BAT] Annabel
I'm a postdoctoral researcher in analytical chemistry. As a chemist, I have allways been interested in computational chemistry and number...


The SixTrack team at the LHC@Home desk for the CERN open days
Dear volunteers,

thanks to those who have filled in the doodle we circulated last week:

We decided to deliver a presentation every day in the most populated time slots out of the doodle poll, i.e. on Sat. 14th Sep, between 03:00 and 04:00 PM, and on Sun 15th Sep, between 02:00 and 03:00 PM.
The meeting point will be the LHC@Home desk in R2 (building 504), at the beginning of the time slot. We will have to walk few minutes to a meeting room where there will be the presentations. We will be back at the meeting point by the end of the time slot at the latest.

Looking forward to shaking hands and meeting you,
Alessio and Massimo, for the SixTrack team
12 Sep 2019, 11:53:15 UTC · Discuss

The SixTrack team welcomes the LHC@Home volunteers at the CERN open days
Dear volunteers,

following Nils's post on the MBs:
the SixTrack team is looking into welcoming you at CERN and greet you for the CPU time you make available to us. To do so in the best way, we would like to know when you will be most likely passing by the IT stand, such that we concentrate our efforts on the time when most of you can be there. Hence, please find below a doodle that we will use to target the optimal time window:

Thanks a lot in advance, and happy crunching!
Alessio and Massimo, for the SixTrack team
2 Sep 2019, 8:33:56 UTC · Discuss

CERN Open Days in 2 weeks!
During the CERN Open Days 2019, we will have a small LHC@home stand as part of the IT activities in building 504 near the Data Centre.

LHC@home will also be present at the ATLAS experiment site, in the ATLAS Computing Corner.

We hope that many of you will be able to visit CERN during the Open Days and would be happy to see you here!

Please refer to: Plan your visit and the list of activities during the Open days for more information about all the visit points on the CERN sites.
30 Aug 2019, 9:07:17 UTC · Discuss

Many queued tasks - server status page erratic
Due to the very high number of queued Sixtrack tasks, we have enabled 4 load-balanced scheduler/feeder servers to handle the demand. (Our bottleneck is the database, but several schedulers can cache more tasks to be dispatched.)

Our server status page does not currently show in real time the daemon status on remote servers. Hence the server status page may indicate a varying number of processes, depending on which web server is active.

Please also be patient if you are not getting tasks for your preferred application quickly enough. After a few retries, there will be some tasks. Thanks for your understanding and happy crunching!

---the team
21 Aug 2019, 11:41:17 UTC · Discuss

CMS@Home disruption, Monday 22nd July
I've had the following notice from CERN/CMS IT:

>> following the hypervisor reboot campaign, as announced by CERN IT here: https://cern.service-now.com/service-portal/view-outage.do?n=OTG0051185
>> the following VMs - under the CMS Production openstack project - will be rebooted on Monday July 22 (starting at 8:30am CERN time):
>> | vocms0267 | cern-geneva-b | cms-home

to which I replied:
> Thanks, Alan. vocms0267 runs the CMS@Home campaign. Should I warn the volunteers of the disruption, or will it be mainly transparent?

and received this reply:
Running jobs will fail because they won't be able to connect to the schedd condor_shadow process. So this will be the visible impact on the users. There will be also a short time window (until I get the agent restarted) where there will be no jobs pending in the condor pool.
So it might be worth it giving the users a heads up.

So, my recommendation is that you set "No New Tasks" for CMS@Home sometime Sunday afternoon, to let tasks complete before the 0830 CST restart. I'll let you know as soon as Alan informs me that vocm0267 is up and running again
17 Jul 2019, 13:14:12 UTC · Discuss

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