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This lowers the memory of o2-sim by deleting each TGeo physical node right after its alignment. - Applying the alignment created one TGeoPhysicalNode per alignable volume (29582), kept for the whole job. - GeometryManager::applyAlignment and Aligner::applyAlignment get an option keepPhysicalNodes, true by default. - o2-sim sets it to false, since it needs no original matrices; reconstruction and alignment are unchanged.
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This lowers the memory of o2-sim by deleting each TGeo physical node right after its alignment. They are
not needed during simulation.
The effect is roughly ~80MB.