[ROOT] Memory usage and TTree::Fill()

From: denis bertini (d.bertini@gsi.de)
Date: Tue Sep 12 2000 - 15:46:26 MEST 

Hi all, 

We have noticed that our ROOT based processes were
always slowly growing in memory. 

This leakage disappears when the TTree::Fill() function of our 
data structures (based on TTree ) is switched off.

I made a test ( outside our framework) using the ROOT 
tutorial example. I just used MainEvent.cxx and looked at the 
size of the Event process. 

Results:
               1) Commenting the TTree::Fill() 
                     Event process size is constant  :  9584 kBytes 
             
               2) Using TTree::Fill() 
                   
                           Nevents                   Event process Size (kBytes)
                           
                            1000                        11332  k
                            5000                        11584  k
                           10000                       11812  k
                            ....
 
 
The setup :
               Os:  Linux Pc  running Debian 2.1 

               ROOT:
                        - Root 225-02   
                        - in .rootrc :   Root.ObjectStat : 0       
                        - i used libNew.so 
                              

 Is there somthing that we have to be aware of when using TTree::Fill()
command ? 
                                                                  Denis Bertini
                                                                  KP1-GSI-Darmstadt

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