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Forum: Hadronic Processes
Re: None Different perfomance on Linux and Windows (Gorelick Sergey)
Date: 18 Dec, 2006
From: Vladimir IVANTCHENKO <vnivanch@mail.cern.ch>

On Sun, 17 Dec 2006, Gorelick Sergey wrote:

> *** Discussion title: Hadronic Processes
> Email replies to PublicHyperNews@slac.stanford.edu must include:
>   In-Reply-To: <"/hadronprocess/615"@geant4-hn.slac.stanford.edu>
>   Subject: ...change this to be about your reply.
> 
> Hello,
> 
> I don't know really know where this question belongs, but seems to me
> that hadronic processes/installation and configuration are the most
> related.
> 
> I simulate passage of protons through a system of slits. The material of
> the slits is Tantalum. I have Geant4 installed both on a Windows and a
> Linux system. The configuration is as follows:
> 
> Windows XP, geant4.8.0.p01, Laptop, Visual C++ compiler Linux Mandriva,
> geant4.8.1.p01, Desktop, gcc 4.0.1
> 
> When the same source code is compiled under Linux and Windows the
> results of calcuations performed by the same simulation differ very
> significantly. For instance, range of proton (which should be in
> principle well established value) in Tantalum are:
> 
> Linux: 1 MeV - approx. 4.6 um (cut-value 100 nm); 2 MeV - approx 14.78 um (cut-value 200 nm)
> Windows: 1 MeV - approx. 6.15 um (cut-value 100 nm); 2 MeV - approx. 16.36 um (cut-value 200 nm)
> 
> The differences are in the range of 10-30% and cannot be ignored. The
> values for the range given by SRIM are 6.34 um for 1 MeV and 16.9 um for
> 2 MeV proton in Tantalum. Value for ranges are the closest for those
> calculated using Win-compiled code.
> 
> This strange behavior of the simulation puzzles me and does not allow me
> continue calculations. I would be most grateful if you provide me with a
> hint of what could be the source of the inconsistency, and how it could
> be beaten.
> 
> Thank you.
> 

Hello,

I have tried 2 MeV protons in tantalum using 
Example/extended/electromagnetic/TestEm7 and standrad PhysList. For both 
cases 1 mm and 0.5 um cut the projectile range is seems to be corrcet.
I am using 8.2, however this place should not be changed between 8.1 and 
8.2. Now my questions:

- do you use standard physics?
- why you need such low cuts?

VI

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1 None: Re: Different perfomance on Linux and Windows   (Gorelick Sergey - 18 Dec, 2006)
(_ None: Re: Different perfomance on Linux and Windows   (Vladimir IVANTCHENKO - 18 Dec, 2006)
(_ None: Re: Different perfomance on Linux and Windows   (Gorelick Sergey - 19 Dec, 2006)
(_ None: Re: Different perfomance on Linux and Windows   (Vladimir IVANTCHENKO - 19 Dec, 2006)
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