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Forum: Installation and Configuration
Re: None different result with different compiler (Rino)
Date: 12 Jun, 2012
From: Ben Morgan <Ben Morgan>

On Mon, 11 Jun 2012 20:51:04 GMT, Rino wrote:
> Hi everybody, I build a MonteCarlo simulation to study the muon-induced
> neutron yield. I find different results when I run the same code in two
> different clusters: in the first one there is installed geant4 version
> 9.3 and gcc 4.3.2, while in the second cluster there is installed geant4
> version 9.3 and gcc 4.1.2.
> 
> The data libraries are exactly the same, so the only difference is in
> the compiler version.
> 
> Even if I initialize the random generator to the same value I obtain
> different results.
> 
> Is there anybody who has had the same problem or that can explain me
> where is the problem?

9.3 was verified on those compilers - but it is rather old. I couldn't find any bugzilla reports on reproducibility in this version, though I only did a quick search so others may comment.

I would strongly recommend updating to the newest Geant4 9.5.1 release and seeing if the problem still occurs in this version. It has many upgrades, so this may resolve the issue, but should it not, we'll be in a better position to help.

Cheers,

Ben.

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