LHC@home

Hi,
I am new to LHC and just upgraded my computer to Ubuntu 22
My Boinc version is 7.22 flatpak version.
The atlas tasks I get always show an error at the 10 minute mark each time I try to run them.
The tasks also are huge compared to other task files from other projects, using more than 300 MB and taking 6 hours to download.
After the same error persisted after several attempts, and after switching from the APT version of Boinc (7.18) to flatpak (7.22) , increasing swap file size to 8 GB.
I eventually gave up and decided to disable the Atlas tasks in project preferences.
After hitting the update button multiple times and restarting Boinc and my computer, Boinc somehow still managed to download a few Atlas tasks and the same exact error followed.
Can anyone with the skills please tell me what is going wrong here?
Thanks for your time.

[2024-03-14 18:57:34] Checking for CVMFS
[2024-03-14 18:57:34] No cvmfs_config command found, will try listing directly
[2024-03-14 18:57:34] ls: cannot access '/cvmfs/atlas.cern.ch/repo/sw': No such file or directory
[2024-03-14 18:57:34] Failed to list /cvmfs/atlas.cern.ch/repo/sw
[2024-03-14 18:57:34] ** It looks like CVMFS is not installed on this host.
CVMFS not installed.
First go thru the messages, how to install for LHC@Home projects.
sixtrack is no problem, but no work ftm.
You need a good networkconnection to ISP and some own knowledge to work with this projects.

bonjour ,
faites comme moi je n'arrive pas a installer et a régler cmfvs.
c'est trop compliqué et personne n'est capable de faire un tuto simple a la portée d'un néophite linux.
les gens poste des instructions mais rien ne marche alors j'ai installé oracle virtualbox pour calculer sur lhc@home et ça marche.

Good morning,
do as I can not install and adjust cmfvs.
it’s too complicated and no one is able to make a simple tutorial within the reach of a linux neophite.
people post instructions but nothing works so I installed oracle virtualbox to calculate on lhc@home and it works.

---

Installing CVMFS and Singularity from repository packages:

sudo apt-get install lsb-release
wget https://ecsft.cern.ch/dist/cvmfs/cvmfs-release/cvmfs-release-latest_all.deb
sudo dpkg -i cvmfs-release-latest_all.deb
rm -f cvmfs-release-latest_all.deb
sudo apt-get update

sudo apt install cvmfs

sudo mkdir -p /scratch/cvmfs

sudo nano /etc/cvmfs/default.local

ADD the following lines to the file:

CVMFS_REPOSITORIES=atlas.cern.ch,atlas-condb.cern.ch,grid.cern.ch
CVMFS_USE_CDN=yes
CVMFS_CACHE_BASE=/scratch/cvmfs
CVMFS_HTTP_PROXY=DIRECT

Save the file.

sudo cvmfs_config setup

Testing:

cvmfs_config probe

Output:
mark@linux-x24:~$ cvmfs_config probe
Probing /cvmfs/atlas.cern.ch... OK
Probing /cvmfs/atlas-condb.cern.ch... OK
Probing /cvmfs/grid.cern.ch... OK

install Singularity

For debian and derivatives:

wget https://github.com/apptainer/singularity/releases/download/v3.8.7/singularity-container_3.8.7_amd64.deb
sudo dpkg -i singularity-container_3.8.7_amd64.deb

The instructions are a bit old and mention Mint 21 needing CVMFS to be built but may have changed by now.

bonsoir a quel fichier faut il ajouter les lignes suivantes?

CVMFS_REPOSITORIES=atlas.cern.ch,atlas-condb.cern.ch,grid.cern.ch
CVMFS_USE_CDN=yes
CVMFS_CACHE_BASE=/scratch/cvmfs
CVMFS_HTTP_PROXY=DIRECT.

merci d'avance.
cela semble évident pour vous mais ce ne l'est pas pour tout le monde surtout en ligne de commande.

What file should we add the following lines?

CVMFS_REPOSITORIES=atlas.cern.ch,atlas-condb.cern.ch,grid.cern.ch
CVMFS_USE_CDN=yes
CVMFS_CACHE_BASE=/scratch/cvmfs
CVMFS_HTTP_PROXY=DIRECT.

thanks in advance.
it seems obvious to you but it is not for everyone especially on the command line.

---

rebonsoir est ce un tuto pour installé singularity et cmfvs?

is this a tutorial for installed singularity and cmfvs?

---

sudo mkdir -p /scratch/cvmfs
pascal@pascal-MS-7D07:~$ sudo nano /etc/cvmfs/default.local
pascal@pascal-MS-7D07:~$ sudo cvmfs_config setup
pascal@pascal-MS-7D07:~$ cvmfs_config probe
Probing /cvmfs/atlas.cern.ch... Failed!
Probing /cvmfs/atlas-condb.cern.ch... Failed!
Probing /cvmfs/grid.cern.ch... Failed!

---

after reboot

pascal@pascal-MS-7D07:~$ cvmfs_config probe
Probing /cvmfs/atlas.cern.ch... Failed!
Probing /cvmfs/atlas-condb.cern.ch... Failed!
Probing /cvmfs/grid.cern.ch... Failed!
pascal@pascal-MS-7D07:~$


linux mint 21,3

---

The File is /etc/cvmfs/default.local The directions have you editing it with NANO. You can search web for NANO instructions or use MAN page help.

add
CVMFS_REPOSITORIES=atlas.cern.ch,atlas-condb.cern.ch,grid.cern.ch
CVMFS_USE_CDN=yes
CVMFS_CACHE_BASE=/scratch/cvmfs
CVMFS_HTTP_PROXY=DIRECT

Save File

sudo cvmfs_config setup

cvmfs_config probe

You should be able to connect then
Just follow the directions by mmonnin. Add singularity

Do I have to use nano? What difference does sudo nautilus then editing with text editor make?
I prefer using GUI where possible, so I make less wrongly typed commands.

I don't think it matters. Try it and see if it works. Let us know what steps you took, what you did and the errors you are seeing if it doesn't.
You might need root privileges to create and save the file in that location.

Thanks for the help.
I should note that default.conf should not be edited and it needs to be copied to create default.list. Then edit the parameters.
This is my output:
ThinkPad-R480:~/Downloads$ sudo cvmfs_config setup
ThinkPad-R480:~/Downloads$ sudo cvmfs_config probe
Probing /cvmfs/atlas.cern.ch... OK
Probing /cvmfs/atlas-condb.cern.ch... OK
Probing /cvmfs/grid.cern.ch... OK
Am I OK now to restart tasks?

I also advise Linux newdomers to not use nano.
Instead, type sudo nautilus (or search the name of the file browser)
then you should be dropped into the files app
find /etc/cvmfs then copy the default file and edit using text editor.
Same for downloading the deb packages. Just download the files from your browser.
https://ecsft.cern.ch/dist/cvmfs/cvmfs-release/cvmfs-release-latest_all.deb
https://github.com/apptainer/singularity/releases/download/v3.8.7/singularity-container_3.8.7_amd64.deb
open the files app ( again, I am using nautilus )
find your downloads directory, and right click.
There should be a "open in terminal" option in the menu.
In the terminal, de-package the file
sudo dpkg -i <packagename>.deb
manually delete the packages after all is set up.

This should be a bit more user-friendly

Also, how do you find this log?

[2024-03-14 18:57:34] Checking for CVMFS
[2024-03-14 18:57:34] No cvmfs_config command found, will try listing directly
[2024-03-14 18:57:34] ls: cannot access '/cvmfs/atlas.cern.ch/repo/sw': No such file or directory
[2024-03-14 18:57:34] Failed to list /cvmfs/atlas.cern.ch/repo/sw
[2024-03-14 18:57:34] ** It looks like CVMFS is not installed on this host.
CVMFS not installed.
First go thru the messages, how to install for LHC@Home projects.
sixtrack is no problem, but no work ftm.
You need a good networkconnection to ISP and some own knowledge to work with this projects.

That was from the returned data for you computer and the tasks that had failed. I think Maeax looked at your returned tasks but I don't know which task it was.

I am guessing this it the correct computer and its tasks.
https://lhcathome.cern.ch/lhcathome/results.php?hostid=10847706

I think you might just need a reboot and try some new native Atlas tasks. That way we should see returned results or failures along with the log data.