Size of ROOT files

[ludovicabrusaferri]

Hi,

I have some problems with the fact that my root files are too big (tens of GB).
I am trying to remove trees i don’t need when i run my main.mac file:
/gate/output/root/setRootSinglesAdderFlag 0
/gate/output/root/setRootSinglesReadoutFlag 0
/gate/output/root/setRootHitFlag 0
/gate/output/root/setRootSinglesFlag 0
/gate/output/root/setRootCoincidencesFlag 1

However, I don’t seem to gain much.
Am I doing something wrong?

Ludovica

[eguiraud]

@ludovicabrusaferri

/gate/output/root/setRootSinglesReadoutFlag 0

Hi Ludovica, what are these /gate/output/root/setRootSinglesReadoutFlag flags? They seem to be related to some third-party (non-ROOT) application that produces the files: if that’s the case, you might have better luck getting in touch with the maintainers of that application.

Otherwise you can use TTree::Print() to check the size of your trees and figure out which ones occupy so much space:

$ root yourfile.root
root [0] sometree->Print()
******************************************************************************
*Tree    :t         : t                                                      *
*Entries :       10 : Total =             947 bytes  File  Size =        446 *
*        :          : Tree compression factor =   1.36                       *
******************************************************************************
*Br    0 :x         : x/l                                                    *
*Entries :       10 : Total  Size=        622 bytes  File Size  =        107 *
*Baskets :        1 : Basket Size=      32000 bytes  Compression=   1.36     *
*............................................................................*

“File size” should be the interesting number for you, representing how much space the TTree occupies on file.

Cheers,
Enrico