Problem 166

Summary: disrepencies between exampleN05.out and my output
Product: Examples/Basic and Novice Reporter: bfodness
Component: N05Assignee: Gabriele Cosmo <Gabriele.Cosmo>
Status: RESOLVED FIXED    
Severity: normal    
Priority: P2    
Version: 2.0   
Hardware: PC   
OS: Linux   

Description bfodness 2000-10-12 10:37:50 CEST 
I have run novice example 5 (N05)and have agreement up to run 9.  Then, my
results vary accordingly:

(Geant4 2.0 bundled output)
### Run 9 start.
>>> Event 0
     22 hits are stored in EM ExN05CalorimeterHitsCollection.
     Total energy deposition in EM calorimeter crytals : 0.9939 (GeV)
     1 hits are stored in HAD ExN05CalorimeterHitsCollection.
     Total energy deposition in HAD calorimeter towers : 0.0056358 (GeV)
>>> Event 1
     19 hits are stored in EM ExN05CalorimeterHitsCollection.
     Total energy deposition in EM calorimeter crytals : 0.99466 (GeV)
     0 hits are stored in HAD ExN05CalorimeterHitsCollection.
     Total energy deposition in HAD calorimeter towers : 0 (GeV)
>>> Event 2
     23 hits are stored in EM ExN05CalorimeterHitsCollection.
     Total energy deposition in EM calorimeter crytals : 0.99342 (GeV)
     2 hits are stored in HAD ExN05CalorimeterHitsCollection.
     Total energy deposition in HAD calorimeter towers : 0.0048977 (GeV)
>>> Event 3
     25 hits are stored in EM ExN05CalorimeterHitsCollection.
     Total energy deposition in EM calorimeter crytals : 0.99585 (GeV)
     1 hits are stored in HAD ExN05CalorimeterHitsCollection.
     Total energy deposition in HAD calorimeter towers : 0.0024477 (GeV)
>>> Event 4
     22 hits are stored in EM ExN05CalorimeterHitsCollection.
     Total energy deposition in EM calorimeter crytals : 0.99564 (GeV)
     2 hits are stored in HAD ExN05CalorimeterHitsCollection.
     Total energy deposition in HAD calorimeter towers : 0.0018529 (GeV)
number of event = 5


(My output run on 1GHz Pentium3, 512Mb RAM)
### Run 9 start.
>>> Event 0
     24 hits are stored in EM ExN05CalorimeterHitsCollection.
     Total energy deposition in EM calorimeter crytals : 0.99979 (GeV)
     0 hits are stored in HAD ExN05CalorimeterHitsCollection.
     Total energy deposition in HAD calorimeter towers : 0 (GeV)
>>> Event 1
     25 hits are stored in EM ExN05CalorimeterHitsCollection.
     Total energy deposition in EM calorimeter crytals : 0.99873 (GeV)
     0 hits are stored in HAD ExN05CalorimeterHitsCollection.
     Total energy deposition in HAD calorimeter towers : 0 (GeV)
>>> Event 2
     22 hits are stored in EM ExN05CalorimeterHitsCollection.
     Total energy deposition in EM calorimeter crytals : 0.99239 (GeV)
     0 hits are stored in HAD ExN05CalorimeterHitsCollection.
     Total energy deposition in HAD calorimeter towers : 0 (GeV)
>>> Event 3
     19 hits are stored in EM ExN05CalorimeterHitsCollection.
     Total energy deposition in EM calorimeter crytals : 0.99992 (GeV)
     0 hits are stored in HAD ExN05CalorimeterHitsCollection.
     Total energy deposition in HAD calorimeter towers : 0 (GeV)
>>> Event 4
     22 hits are stored in EM ExN05CalorimeterHitsCollection.
     Total energy deposition in EM calorimeter crytals : 0.9999 (GeV)
     0 hits are stored in HAD ExN05CalorimeterHitsCollection.
     Total energy deposition in HAD calorimeter towers : 0 (GeV)
number of event = 5
#
Graphics systems deleted.
VisManager deleting.

How severe of a problem is this?
Comment 1 Gabriele Cosmo 2000-10-13 02:02:59 CEST 
Differences in reference outputs among different platforms/architectures
(reference outputs of examples are generated on SUN-Solaris) were due to a
problem of reproducibility of random sequences, which now is solved since
release 2.0 + patch01. I believe the reference outputs for the examples
have not been updated in the public version, though.
You'll get the new correct ones in the next release.
Note however that we cannot assure -exact- output sequences for all
architectures. In some cases, different output stream formatting or little
precision issues may cause outputs to differ substantially.