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GeezerVison is showing github.com — Share the scaled TPC distortions between the digitizers of a job by sawenzel · Pull Request #2541 · AliceO2Group/O2DPG

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@sawenzel

@sawenzel sawenzel commented Nov 9, 2026

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For distortion type 2, the TPC digitizer lanes now share the scaled distortions through tpc_scaled_distortions.root in the job directory, so that they are computed once per job instead of once per lane and timeframe. Since only one lane computes, the lanes get NWORKERS_TF threads for the computation.

The option is only passed when o2-sim-digitizer-workflow knows --tpc-distortion-file (AliceO2Group/AliceO2#16091), so nothing changes with older software. For a Pb-Pb timeframe this brings the TPC digitization from 216 s to 48 s and saves about 4 GiB of memory, with identical digits.

Assisted by Claude Code.

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@sawenzel @claude
Share the scaled TPC distortions between the digitizers of a job
68db82a 
This passes a common distortion file to the TPC digitizer lanes, so that the scaled distortions are computed once per job.

- Used for distortion type 2 when o2-sim-digitizer-workflow knows --tpc-distortion-file.
- The file is tpc_scaled_distortions.root in the job directory.
- Only one lane computes, so the lanes get NWORKERS_TF threads for the distortions.

https://its.cern.ch/jira/browse/O2-7309

Co-Authored-By: Claude Opus 5.5 <[email protected]>
@sawenzel sawenzel mentioned this pull request Nov 9, 2026
Share the scaled TPC distortions between digitizers through a file AliceO2Group/AliceO2#16091
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@sawenzel
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