Re: Duplicated tree

see http://root.cern.ch/root/html/TTree.html#TTree:AutoSave

Rene Brun

James Jackson wrote:
> Hi,
>
> I'm trying to track down a strange problem... I have some common code,
> which I run over many datasets, to create and fill some trees. Each
> tree is created once, and only once.
>
> In some instances, the resulting ROOT file has duplicates. The output
> should look like this:
>
> Unknown-00-17-f2-51-00-e3:PhotonJetPt15 jamesjackson$ root -l
> output_15.root
> root [0]
> Attaching file output_15.root as _file0...
> root [1] TDirectory *d = _file0.Get("tupiliser")
> root [2] d->ls()
> TDirectoryFile* tupiliser tupiliser (Tupiliser) folder
> KEY: TTree EventData;1 Per event object information
> KEY: TTree McElectrons;1 MC Electrons
> KEY: TTree HeepElectrons;1 HEEP Electrons
> KEY: TTree Tracks;1 Tracks
> KEY: TTree SuperClusters;1 SuperClusters
> KEY: TTree GenData;1 GenData
>
> However, sometimes, I get the following:
>
> Unknown-00-17-f2-51-00-e3:QCDpt30 jamesjackson$ root -l output_1.root
> root [0]
> Attaching file output_1.root as _file0...
> root [1] TDirectory *d = _file0.Get("tupiliser")
> root [2] d->ls()
> TDirectoryFile* tupiliser tupiliser (Tupiliser) folder
> KEY: TTree Tracks;3 Tracks
> KEY: TTree Tracks;2 Tracks
> KEY: TTree EventData;1 Per event object information
> KEY: TTree McElectrons;1 MC Electrons
> KEY: TTree HeepElectrons;1 HEEP Electrons
> KEY: TTree SuperClusters;1 SuperClusters
> KEY: TTree GenData;1 GenData
>
> Note "Tracks" is duplicated.
>
> Does this look like anything anyone's seen before? Can anything
> trigger a re-creation of a tree during filling?
>
> Any hints welcome - I can see nothing in my code that would re-create
> the tree.
>
> Regards,
> James.
>
Received on Wed Apr 22 2009 - 16:52:53 CEST