Re: Change the default maximum TTree size

No, we will not change the MaxTreeSize for several reasons. It is trivial to change it yourself with a statement like

   //Authorize Trees up to 2 Terabytes (if the system can do it)    TTree::SetMaxTreeSize(1000*Long64_t(2000000000));

Rene Brun

Ida Häggström wrote:
> 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 - 10:18:41 CET