MCLabelAccumulator.cxx

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// Copyright 2019-2020 CERN and copyright holders of ALICE O2.
// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
// All rights not expressly granted are reserved.
//
// This software is distributed under the terms of the GNU General Public
// License v3 (GPL Version 3), copied verbatim in the file "COPYING".
//
// In applying this license CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
 
 
#include "MCLabelAccumulator.h"
 
#include "GPUHostDataTypes.h"
#include "GPUTPCClusterFinder.h"
#include "SimulationDataFormat/MCTruthContainer.h"
 
using namespace o2::gpu;
using namespace o2::gpu::tpccf;
 
MCLabelAccumulator::MCLabelAccumulator(GPUTPCClusterFinder& clusterer)
  : mIndexMap(clusterer.mPindexMap), mLabels(clusterer.mPinputLabels), mOutput(clusterer.mPlabelsByRow)
{
}
 
void MCLabelAccumulator::collect(const ChargePos& pos, Charge q)
{
  if (q == 0 || !engaged()) {
    return;
  }
 
  uint32_t index = mIndexMap[pos];
 
  const auto& labels = mLabels->getLabels(index);
 
  for (const auto& label : labels) {
    int32_t h = label.getRawValue() % mMaybeHasLabel.size();
 
    if (mMaybeHasLabel[h]) {
      auto lookup = std::find(mClusterLabels.begin(), mClusterLabels.end(), label);
      if (lookup != mClusterLabels.end()) {
        continue;
      }
    }
 
    mMaybeHasLabel[h] = true;
    mClusterLabels.emplace_back(label);
  }
}
 
void MCLabelAccumulator::commit(Row row, uint32_t indexInRow, uint32_t maxElemsPerBucket)
{
  if (indexInRow >= maxElemsPerBucket || !engaged()) {
    return;
  }
 
  auto& out = mOutput[row];
  while (out.lock.test_and_set(std::memory_order_acquire)) {
    ;
  }
  if (out.data.size() <= indexInRow) {
    out.data.resize(indexInRow + 100); // Increase in steps of 100 at least to reduce number of resize operations
  }
  out.data[indexInRow].labels = std::move(mClusterLabels);
  out.lock.clear(std::memory_order_release);
}