Hadd very slow?!

Dear all

I am using hadd to merge 200 files. Each file contains 1000 TDirectories, and each TDirectory contains 20 TH1D histograms.

The command has been running for 48 hours now, and it’s slowing down.

Any opinion, advice, seen-before, …?

Thanks
Maarten

Hi,

Try merging first files at a time and/or try upgrading to a newer version of ROOT.

Cheers,
Philippe.