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Keywords: voxelisation, smartless
Forum: Geometry
Re: Question Memory Explosion (Daniel Casey)
Date: 14 Aug, 2007
From: Gabriele Cosmo <Gabriele Cosmo>

Hi Dan,

> I have a strange bug in my simulation where I can run say 5 protons
> through a magnetic field and through some simple box shaped materials
> quickly and apparently correctly, but when I move a box a small amount
> and rerun the simulation runs forever and the memory usage blows up
> from ~9Mb to 200+ Mb.

you should first verify that you are NOT introducing overlaps; if so,
verify if the memory growth is happening at initialisation time; try to
run your application with:
  /run/verbose 2
This should print out a statistics (memory, time) of the voxels created
for optimise the geometry. If you indentify a particular volume for which
the optimisation is much consuming, you can try to manually tune the
optimisation for the volume concerned (say, 'yourLogicalVolume') in your
code; try with:
  yourLogicalVolume->SetSmartless(1.0);  // ... or 0.5
In some rare cases (depending on the geometry setup) it may be necessary
to manually tune the geometry optimisation...

Cheers, Gabriele

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