LHC@home

Hi,

We just released ATLAS native for Linux v2.90. This contains several improvements:

- Apptainer is now used instead of Singularity to provide the container environment for the tasks. Today Apptainer is essentially the same as Singluarity but may diverge in the future, so if you rely on a local installation of Singularity it would be better to install Apptainer. However the Apptainer binary on CVMFS that is used by default should work in most cases so there should be no need to install anything locally. In case this doesn't work the tasks will fallback to use a local Singularity if it exists.

- The way that the BOINC working directory is mounted into the container is changed to fix these kind of errors

- The large input file used by each task is hard-linked rather than copied to the BOINC slot directory to save time and disk space

Please let us know here of any issues.

I have reverted back to v2.87. Many tasks were failing with errors creating temporary files like this:

Failed to execute payload:mktemp: failed to create file via template '/tmp/asetup_XXXXXX.sh': Read-only file system

which may be related to the change in the way directories are mounted in the container. I'm investigating.