I have a huge root files (in total 160 GB) containing the same informations. These files are used in a TChain to get the tree. The total entries are more than 1 800 000 000.
The problem is, when I fill TH1D histograms with these entries, I get empty histograms, while when I use half of the files I get the right results.
v5.34 is very old, could you verify whether the same problem exists in v6.24/06. If the problem is still present, can you please provide a minimal reproducer so we can check what’s going on?