GuilhermeLimaSandbox

Understanding memory usage reports

I am trying to understand a little better the memory usage numbers reported by Athena, as part of the inert material validation. My idea was to switch some systems on/off, and look at the effects in terms of memory usage.

I start with Muon system only (MSOnly), but having a full detector as a reference (-full-). MSfull includes both chambers and inert material. old- means that I am using the old description for inert material (GeoModel-based) --- I will add AGDD-based volumes soon, but I am trying to understand a few puzzles first.

So here is a first batch of numbers:

Open Questions

1. (c1) shows that inert volumes do not contribute to Muon memory usage.  There is some increase to G4init and Geant4 memory only.
   
2. (c3 vs. c1+c2)  suggests that for Geant4, MSfull is much more than chambers + inert Material.  Does anyone understands why?
3. (cf-c3) GeoModel requires less memory for full Atlas than for MSonly?!?

-- GuilhermeLima - 02 Mar 2009