I’m running into troubles when trying to use hadd to merge some root files I have.
After hanging for a while, I get the following error:
and an empty output file.
I have 520 root files with a total size of 11GB.
They live in the following directory on EOS at CERN:
I tried to use the “-n 50” option to open small chunks of 50 files, but this didn’t fix the issue.
Am I going in the right direction? Or should I try something different?
UPDATE: the merging worked if I use the “extreme” option -n 1 (i.e, only one file opened each time). I guess that there should be some optimal point (5, 10 files or similar).