[Halld-offline] Reconstruction results not consistent

[Beni Zihlmann]

Hi Will, David,
I duplicated what you see. I look for each event how many photons are 
reconstructed. the result is
shown in the two attached files. The diff_sidebyside.dat file shows for 
each event the number of
reconstructed photons on the left for the first reconstruction on the 
right for the second reconstruction.
the diff.dat file contains only those event where a difference is found. 
This should help for further
debuging.

cheers,
Beni

> Hi,
> I noticed recently that I've been getting different results when 
> running reconstruction multiple times on the same file. It seems like 
> that for a small number of events, the number of particles 
> reconstructed varies. I think this problem will occur with any input, 
> but I've uploaded one particular hddm file where I've seen the problem 
> (http://www-meg.phys.cmu.edu/wilevine/hdgeant_smeared.hddm ). I think 
> the simplest way to see the problem is to run the reconstruction with 
> the phys_tree plugin twice (i.e.
> hd_root -PPLUGINS=phys_tree hdgeant_smeared.hddm -o output.1.root
> hd_root -PPLUGINS=phys_tree hdgeant_smeared.hddm -o output.2.root
> ) and compare the output. In particular, differences should be seen in 
> the Npip, Nphoton, etc. histograms.
>
> For the record I'm using svn revision 7974 and the problem seems to 
> occur in both SIMD and non-SIMD builds.
>
> If anyone can confirm or diagnose this issue, that would be helpful.
>
> Will
>
>
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