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.

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User of the Day

User profile Profile shiva
Hello I'm Rick I live in western Kansas about 60 miles from the center of the USA. I'm a Risk Manager, that is a fancy way of saying an insurance...


killing extremely long SixTrack tasks
Dear all,

we had to kill ~10k WUs named:


due to a mismatch between the requested disk space and that actually necessary to the job.
These tasks would anyway be killed by the BOINC manager at a certain point with an EXIT_DISK_LIMIT_EXCEEDED message - please see:
for further info.

These tasks cover 10^7 LHC turns, a factor 10 larger than usual, with files building up in dimension until the limit is hit.

The killing does not involve all tasks with such names - I have killed only those that should cover the stable part of the beam; these tasks are expected to last long and hence reach the limit in disk usage. The other WUs should see enough beam losses that the limit is not reached - please post in this thread if this is not the case. The cherry-picking killing was done in the effort of preserving as much as possible tasks already being crunched or pending validation.

As soon as you update the LHC@project on your BOINC manager you should see the task being killed.

We will resubmit soon the same tasks, with appropriate disk requirements.
Apologies for the disturbance, and thanks for your understanding.
18 Jun 2019, 16:49:08 UTC · Discuss

Using a local proxy to reduce network traffic for CMS
Thanks to computezrmle, with additional work from Laurence and a couple of CMS experts (and my adding one line to the site-local-config file) there is now a way to set up a local caching proxy to greatly reduce your network traffic. Each job instance that runs within s CMS BOINC task must retrieve a lot of set-up data from our database. This data doesn't change very often, so if you keep a local copy the job can access that rather than going over the network every time.
Instructions on how to do this are available at https://lhcathomedev.cern.ch/lhcathome-dev/forum_thread.phpp?id=475&postid=6396 or https://lhcathome.cern.ch/lhcathome/forum_thread.php?id=5052&postid=39072
7 Jun 2019, 14:24:45 UTC · Discuss

new exes for SixTrack 5.02.05
Dear volunteers,

we are pleased to announce the release to production (SixTrack app) of new exes for the current pro version (v5.02.05). We have new exes for FreeBSD (avx/sse2), an exe for XP hosts (32bits), an aarch64 executable for Linux, and one for Android. Many thanks to James, Kyrre and Veronica for finding the time to produce them.

Distributing an exe compatible with XP hosts is not a way to encourage people to stay with unsupported OSs, but rather a trial to have a smooth transition to more recent OSs. In this way, people with XP hosts do not miss the possibility to contribute to the present wave of SixTrack tasks (expected to be quite long) while considering options for upgrading their hosts. At the same time, we are looking into preparing 32bits Linux exes. It should be noted that all Win exes are distributed without targeting specific kernel versions - hence, XP hosts may receive tasks with regular Windows exes immediately failing, but the BOINC server should quickly learn that the XP-compatible exe is the appropriate one.

We are also very happy to start involving freeBSD and Android users in our production chain. For the latter platform, the present exe won't run on Android versions >=8 - James is still looking into this. Since the android version filtering needs a fix on the scheduler side:
we labelled the Android exe as beta. Hence, Sixtrack beta users with Android 8 and later should not request tasks for that host or untick the test applications flag in their LHC@home project preferences.

We are pursuing also the generation of MacOS exes, and we should test them soon on sixtracktest.

Thanks for your continuous support and help,
Alessio, for the SixTrack team
4 Jun 2019, 10:17:02 UTC · Discuss

2019 BOINC Pentathlon is over - a big thank you from the SixTrack team!
Dear volunteers,

the 2019 pentathlon is over, and we would like to thank all the participants for having crunched our tasks! We saw the BOINC CPU capacity almost doubled, boosting our calculations, even though it was only for few days. We are very grateful for that!

The SixTrack team would also like to thank all you volunteers who regularly support us with your CPUs. You give us the possibility to deepen our understanding of the dynamic aperture, a quantity of paramount importance for the stability of particle beams in big research accelerators like superconducting colliders - last but not least a very recent paper on the most important journal in the field of accelerator physics, comparing simulations and measurements:
where simulation results have been obtained thanks to you and BOINC!

A lot has been already done with your help, but a lot more has still to come in the next future. We count on your support!
Keep up the good work,
Alessio and Massimo, for the SixTrack team
20 May 2019, 8:00:15 UTC · Discuss

BOINC Pentathlon - Sixtrack sprint
We are very grateful to have been chosen for the BOINC Pentathlon of SETI Germany over the next days. For this, the Sixtrack team has submitted a huge backlog of jobs, and our servers will primarily distribute Sixtrack tasks over the next days. There will only be drip-feed of other applications for now until our backlog is reduced. For fans of other applications, stay tuned or run Sixtrack for a few days.
15 May 2019, 14:30:26 UTC · Discuss

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