Re: [ROOT] Creation of chains

From: Rene Brun (Rene.Brun@cern.ch)
Date: Thu Sep 19 2002 - 10:57:49 MEST


Hi Ole,

On Thu, 19 Sep 2002, Ole Streicher wrote:

> Ciao Rene!
> 
> Rene Brun writes:
>  > If you use 3.03/08, TChain::Merge will automatically swap
>  > to a new file when it gets the maximum file limit.
> 
> I tried it with 3.03/09. It seems to work; however at the first file
> switch I get the error message
> 
> Fill: Switching to new file: Run0001.Physics.Tracker.Raw_1.root
> dlopen error: /opt/root/lib/root/libGpad.so: undefined symbol: __ti10TPaveLabel
> Load Error: Failed to load Dynamic link library /opt/root/lib/root/libGpad.so
> *** Interpreter error recovered ***
> 
> Is this dangerous? OS is Linux.
> 

I do not understand this problem! Are you linking the main executable
yourself or using root.exe? Could you try with the recently released
3.03/09? I cannot reproduce this problem.
Make sure to have the right $ROOTSYS/etc/system.rootrc

> I used "TTree::SetMaxTreeSize(1000000);" to see the effect faster ;-)
> 
> BTW, is it possible to make the max treesize local to the tree? It is
> nothing I would need now ;-) but I could imagine that one would like
> to have the size different for different trees.

Currently, the maxtreesize is global. It could be made local to the Tree.
With may be some complication in case a Tree is split over several files.

Rene Brun


> 
> Ole
> 



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