The software of the ATLAS experiment at the CERN LHC accelerator contains a number of tools to inspect (validate, summarize, peek into etc.) all its official data formats recorded in ROOT files. These tools — mainly written in the Python programming language — handle the ROOT TTree which is currently the main storage object format of ROOT files. However, the ROOT project has developed a successor to TTree, called RNTuple. The new storage format offers significant improvements and ATLAS plans to adopt it in LHC Run 4. Work is ongoing to enhance the tools in order to handle the RNTuple storage format in addition to TTree in a transparent way for the user. The work is aided by modern and detailed APIs provided by RNTuple. In this paper we present the progress made and lessons learned.
Rybkin et al. (Tue,) studied this question.
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