Change the default maximum TTree size

Hello!

I'm a new ROOT-user (version 5.24) and have a question regarding the maximum TTree file size. I'm running a Monte Carlo simulation software called Gate (based on Geant4) which produces ROOT output. I've understood the maximum allowed file size by default is 1.9GB, but could be changed to something larger if your OS allows it. I run CentOS 5 Linux with file system ext3 and I think the maximum size should be at least 16GB. I've briefed through the forum and users guide and found that you can change the maximum allowed size via the command TTree::SetMaxTreeSize(). This only applies for that particular instance of ROOT however (right?), when you exit and start a new ROOT you have your default settings again. Using Gate, I never open ROOT myself during the creation of the output files... I wonder if you can change the default 1.9GB to say 16GB instead? In the TTree.h file, line 393

static void SetMaxTreeSize(Long64_t maxsize = 1900000000);

Can you change the size here and recompile Root to get the new default?? Thank you!
Ida Received on Tue Nov 03 2009 - 09:31:58 CET