Fix second iteration

Author: mconcas

Detectors/ITSMFT/ITS/tracking/GPU/ITStrackingGPU/TrackingKernels.h

@@ -195,8 +195,10 @@ void processNeighboursHandler(const int startLayer,
                               const float MaxChi2ClusterAttachment,
                               const o2::base::Propagator* propagator,
                               const o2::base::PropagatorF::MatCorrType matCorrType,
-                              std::vector<int>& updatedCellIdHost,        // temporary host vectors
-                              std::vector<CellSeed>& updatedCellSeedHost, // temporary host vectors
+                              const std::vector<int>& lastCellIdHost,        // temporary host vector
+                              const std::vector<CellSeed>& lastCellSeedHost, // temporary host vector
+                              std::vector<int>& updatedCellIdHost,           // temporary host vector
+                              std::vector<CellSeed>& updatedCellSeedHost,    // temporary host vector
                               const int nBlocks,
                               const int nThreads);
 

Detectors/ITSMFT/ITS/tracking/GPU/cuda/CMakeLists.txt

@@ -13,7 +13,7 @@
 if(CUDA_ENABLED)
 find_package(CUDAToolkit)
 message(STATUS "Building ITS CUDA tracker")
-# add_compile_options(-O0 -g -lineinfo -fPIC)
+add_compile_options(-O0 -g -lineinfo -fPIC)
 # add_compile_definitions(ITS_MEASURE_GPU_TIME)
 o2_add_library(ITStrackingCUDA
                SOURCES ClusterLinesGPU.cu

Detectors/ITSMFT/ITS/tracking/GPU/cuda/TrackerTraitsGPU.cxx

@@ -298,19 +298,39 @@ void TrackerTraitsGPU<nLayers>::findRoads(const int iteration)
                                         mTrkParams[0].MaxChi2ClusterAttachment, // float maxChi2ClusterAttachment
                                         mTimeFrameGPU->getDevicePropagator(),
                                         mCorrType,
+                                        lastCellId,      // temporary host vector
+                                        lastCellSeed,    // temporary host vector
                                         updatedCellId,   // temporary host vectors
                                         updatedCellSeed, // temporary host vectors
                                         conf.nBlocks,
                                         conf.nThreads);
 
-      int level = startLevel;
-      for (int iLayer{startLayer - 1}; iLayer > 0 && level > 2; --iLayer) {
-        lastCellSeed.swap(updatedCellSeed);
-        lastCellId.swap(updatedCellId);
-        std::vector<CellSeed>().swap(updatedCellSeed); /// tame the memory peaks
-        updatedCellId.clear();
-        processNeighbours(iLayer, --level, lastCellSeed, lastCellId, updatedCellSeed, updatedCellId);
-      }
+      // int level = startLevel;
+      // for (int iLayer{startLayer - 1}; iLayer > 0 && level > 2; --iLayer) {
+      //   lastCellSeed.swap(updatedCellSeed);
+      //   lastCellId.swap(updatedCellId);
+      //   std::vector<CellSeed>().swap(updatedCellSeed); /// tame the memory peaks
+      //   updatedCellId.clear();
+      //   processNeighboursHandler<nLayers>(iLayer,
+      //                                     --level,
+      //                                     mTimeFrameGPU->getDeviceArrayCells(),
+      //                                     mTimeFrameGPU->getDeviceCells()[iLayer],
+      //                                     mTimeFrameGPU->getNCells()[iLayer],
+      //                                     mTimeFrameGPU->getDeviceArrayUsedClusters(),
+      //                                     mTimeFrameGPU->getDeviceNeighbours(iLayer - 1),
+      //                                     mTimeFrameGPU->getDeviceNeighboursLUTs(),
+      //                                     mTimeFrameGPU->getDeviceArrayTrackingFrameInfo(),
+      //                                     mBz,
+      //                                     mTrkParams[0].MaxChi2ClusterAttachment, // float maxChi2ClusterAttachment
+      //                                     mTimeFrameGPU->getDevicePropagator(),
+      //                                     mCorrType,
+      //                                     lastCellId,      // temporary host vector
+      //                                     lastCellSeed,    // temporary host vector
+      //                                     updatedCellId,   // temporary host vectors
+      //                                     updatedCellSeed, // temporary host vectors
+      //                                     conf.nBlocks,
+      //                                     conf.nThreads);
+      // }
       for (auto& seed : updatedCellSeed) {
         if (seed.getQ2Pt() > 1.e3 || seed.getChi2() > mTrkParams[0].MaxChi2NDF * ((startLevel + 2) * 2 - 5)) {
           continue;