How to handle THnSparse larger than 500Mo

[Wile_E_Coyote]

Help on Method/s to create Tree from multi-fold gamma-ray coincidence data

The “his3D” is a “THnSparseF” and you do not use “weights” when filling it so, it should be 4 bytes per bin. There are 128708567 filled bins so, it should be around 491MB (which is significantly less than 1GB). Why does it need more than 1 GB then? Maybe the chunks’ management uses a lot of memory, too? I’m afraid we need @pcanal for further debugging. @pcanal … Can one somehow write this histogram in “split” mode (so that the 1GB limit is valid for “independent parts” / “data members” of i…