Memory leak with BuildIndex method, for a big TChain

[Erik]

Thanks to this topic :

TTree::GetEntryWithIndex - error due to cast long -> Int_t

ROOT Version 6.11/01 gcc (Ubuntu/IBM 5.4.0-6ubuntu1~16.04.4) 5.4.0 20160609 Hi, I’m working on a machine learning project. I want to store the output of a classifier in a TTree, along with the corresponding eventNumber and runNumber for each given event. I also want to apply a cut based on some other criteria (number of b-jets for example) so I do not have to run the classifier over ALL the events. In order to retrieve this information during the actual analysis, I load this “classifier tree…

I use :
Long64_t entry = first_t->GetEntryNumberWithIndex( 0 , comparison_List[index_min_value])
first_t->GetEntry(entry)

Instead of:
first_t->GetEntryWithIndex( 0 , comparison_List[index_min_value]);

and it works !
Now, I’m going to make some tests about the execution time !