[Halld-offline] Reconstruction results not consistent

Will Levine wilevine at andrew.cmu.edu
Tue Jun 28 11:24:16 EDT 2011

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.

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