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Forum: Multithreading
Re: Question Irreproducible results (Tom Roberts)
Re: None Re: Irreproducible results (Tom Roberts)
Date: 28 Feb, 2015
From: Tom Roberts <Tom Roberts>

I have found the problem, and described it in
  http://bugzilla-geant4.kek.jp/show_bug.cgi?id=1718

The problem is comparison for equality between doubles. In my case, for the event I was debugging, they were exactly equal in sequential mode, but equal only to 14 significant digits in MPI mode.

I believe that the flakiness of this coding error can explain the curious symptoms I found. Moreover, fixing line 168 in G4WentzelOKandVIxSection.cc made the problem go away.

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1 Note: Re: SOLVED Irreproducible results   (Andrea Dotti - 28 Feb, 2015)
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