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ITS: cell neighbour step use atomicMax #14595

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Merged
mconcas merged 1 commit into from
Aug 27, 2025
Merged

ITS: cell neighbour step use atomicMax #14595

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16 changes: 5 additions & 11 deletions Detectors/ITSMFT/ITS/tracking/src/TrackerTraits.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -596,20 +596,14 @@ void TrackerTraits<nLayers>::findCellsNeighbours(const int iteration)
mTimeFrame->getCellsNeighbours()[iLayer].reserve(cellsNeighbours.size());
std::ranges::transform(cellsNeighbours, std::back_inserter(mTimeFrame->getCellsNeighbours()[iLayer]), [](const auto& neigh) { return neigh.cell; });

auto it = cellsNeighbours.begin();
int current = it->nextCell;
int maxLvl = it->level;
++it;
for (; it != cellsNeighbours.end(); ++it) {
if (it->nextCell == current) {
for (auto it = cellsNeighbours.begin(); it != cellsNeighbours.end();) {
int cellIdx = it->nextCell;
int maxLvl = it->level;
while (++it != cellsNeighbours.end() && it->nextCell == cellIdx) {
maxLvl = std::max(maxLvl, it->level);
} else {
mTimeFrame->getCells()[iLayer + 1][current].setLevel(maxLvl);
current = it->nextCell;
maxLvl = it->level;
}
o2::gpu::CAMath::AtomicMax(mTimeFrame->getCells()[iLayer + 1][cellIdx].getLevelPtr(), maxLvl);
}
mTimeFrame->getCells()[iLayer + 1][current].setLevel(maxLvl);
}
});
}
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