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Improvements on PrStoreUTHit

Merged Monir Hadji requested to merge mhadji-change-utsort into master

This MR needs LHCb!1163 (merged)

id is a unique number to identify couple station/layer

current algo : sort (using rv3) ut hits by id first then by x at y=0

here we have swaps on 2 vectors :

  • the id vector of MultiIndexedHitContainer
  • the hits vector of MultiIndexedHitContainer

as input we have already hits sorted by id

  • Remove this sort and replace by a stable sort on x for the 4 layers;
  • Also use a constant time getter to get sectors of UT

gain around ~55% on PrStoreUTHit according to callgrind

before; after

utimprove

recbefore.cg recafter.cg

@sponce

Edited by Marco Cattaneo