Questions and Answers : Unix/Linux : LHC@Home not fetching tasks
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PRHumphrey

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Message 35852 - Posted: 10 Jul 2018, 11:10:46 UTC

It's now eight days since LHC@Home showed any progress on the Statistics page of boincmgr. It keeps communicating with the server, but always reports "Not requesting tasks: don't need (CPU: job cache full; AMD/ATI GPU: )". That can't be true: I often have well over 200 tasks either running or waiting, but at the moment I have only about 40.
I've tried resetting the project and updating, but that's made no difference. What else can I try?
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Peter.
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computezrmle
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Message 35853 - Posted: 10 Jul 2018, 11:25:35 UTC

Which app do you try to run?

SixTrack doesn't have any tasks at the moment.
See:
https://lhcathome.cern.ch/lhcathome/server_status.php

The other apps require VirtualBox to be installed on your host.

ATLAS (native) doesn't require VirtualBox but "allow beta apps" to be selected and a local CVMFS client and Singularity to be installed.
See:
https://lhcathome.cern.ch/lhcathome/forum_thread.php?id=4703&postid=35234
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PRHumphrey

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Message 35854 - Posted: 10 Jul 2018, 14:37:42 UTC - in response to Message 35853.  

I have all apps selected except benchmark, I've enabled running test applications, and I have VirtualBox installed and running. I've also recompiled sci-apps/boinc (this is a Gentoo box).

I now see, though, that I have only one project's tasks here: Einstein@Home. My other five projects are all declining to fetch tasks: Asteroids@Home, LHC@Home, MilkyWay@Home, SETI@Home and Universe@Home.

What are CVMFS and Singularity? How would I use them?
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Peter.
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Message 35991 - Posted: 21 Jul 2018, 23:20:33 UTC - in response to Message 35854.  

What are CVMFS and Singularity? How would I use them?


That question is off-topic in this thread but I'll stretch the rules a little...

CVMFS and Singularity won't fix the problem with the scheduler declining to fetch tasks for this project. They are required for running the ATLAS native application. You are running the ATLAS app in VBox which is the way most volunteers do it and the only way to do it on Windows. However, if you are into Linux and are prepared to do some additional setup work then you can run the ATLAS native app which eliminates the overhead of VBox. In this thread gyllic provides easy to follow steps for setting it up on Debian. Note that his guide shows how to compile and set up everything from source code so it should be fairly distro independent.

The disadvantage to using the ATLAS native app is that for reasons I do not understand BOINC seems to want to download ATLAS VBox tasks if you have VBox installed. I had to uninstall VBox to get ATLAS native to work reliably. So on that rig I crunch only ATLAS and Sixtrack. I have another rig that has VBox installed and it is configured to run Theory and LHCb tasks but not ATLAS. There may be other solutions to that problem.
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Message 35998 - Posted: 22 Jul 2018, 8:17:05 UTC - in response to Message 35991.  

I don't see why it's off-topic; I only asked for an explanation of terms someone had introduced. Thanks for explaining though.

Be that as it may, LHC@Home is now apparently working again. I don't know what I did, but my problem seems to have solved itself.
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Peter.
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Questions and Answers : Unix/Linux : LHC@Home not fetching tasks


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