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Question Limit to number of events processed in a single run? 

Forum: Run Management
Date: 03 Oct, 2011
From: Sam Blake <Sam Blake>

Hello,

First off, let me apologize in advance in case this has already been addressed in this forum!

I was wondering if there exists an upper limit to the number of events that can be processed in a single run. Given that the function G4RunManager::BeamOn(G4int) takes a G4int as input, where G4int is typedef int (in source/global/management/include/G4Types.hh), does it then make sense that the number of events processed in a single run is limited by the size of the 'int' datatype on a user's system?

An 'int' datatype is 4 bytes on my system, so if G4int is defined as a signed integer, than the maximum value for a G4int on my system would be 2,147,483,647. Accordingly, when I try to run a simulation with any number of events larger than this, my simulation crashes.

I was wondering if a) I am understanding this problem correctly and b) if there is a workaround to this to allow, say, 5 billion events in a single run. I imagine it would not be a good idea to redefine G4int as something larger than int!

Thank you in advance for your help, Sam

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