What is row_wise_branch which is created only in MT mode?

Recording, Visualizing and Persisting Data
1

I’m using Geant4.10.5.1.
When I run the example B4c in multi-thread mode and output to a root file, the columns of ntuple created in B4RunAction.cc are under row_wise_branch as below:

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What is row_wise_branch?
It’s no problem for me. But if all columns are just under TTree like those in single-thread mode, it’s better for me.
It is possible?

And I’m implementing a Geant4 application based on B4c.
I added some columns of a vector.
The multi-thread mode also creates columns named “{name}_count” for columns of a vector named “{name}”.
What is this?

2

Hello,
The meaning of the row_wise_branch is explained in the Application Developers Guide, see:
http://geant4-userdoc.web.cern.ch/geant4-userdoc/UsersGuides/ForApplicationDeveloper/html/Analysis/managers.html#parallel-processing

With the next Geant4 version, 10.6, a new merging mode will be added which will perform ntuple merging with preservation of rows with the additional branch in the output.

Best regards,

3

Hi Ivana,

Thank you for your reply!
The link is very helpful since I couldn’t find any documents about it.

Best regards,
Genki