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.
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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
Native ATLAS and Theory applications require a CVMFS configuration update
Volunteers running ATLAS native and/or Theory native are kindly asked to update their local CVMFS configuration. Please see the following post for the details.
5 Jul 2019, 8:06:20 UTC · Discuss
Our BOINC servers were unavailable from 13:45 to 15:30 CET this afternoon due to a problem with a shared storage cluster. This explains possible download/upload errors from your clients.
Sorry for the trouble and happy crunching.
26 Jun 2019, 13:53:13 UTC · Discuss
killing extremely long SixTrack tasks
we had to kill ~10k WUs named:
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