Refactoring the new Async backend components

CMakeLists.txt

@@ -164,11 +164,11 @@ endif()
 #----------------------------------------------------------------------------#
 set(ADEPT_G4_INTEGRATION_SRCS
   src/AdePTTrackingManager.cc
+  src/AdePTTrackingManager.cu
   src/AdePTPhysics.cc
   src/HepEMPhysics.cc
   src/AdePTGeant4Integration.cpp
   src/AdePTConfigurationMessenger.cc
-  src/AdePTConfiguration.cc
 )
 
 add_library(CopCore INTERFACE)
@@ -180,8 +180,6 @@ target_include_directories(CopCore
 
 add_library(AdePT_G4_integration SHARED
   ${ADEPT_G4_INTEGRATION_SRCS}
-  src/AdePTTransport.cc
-  src/AdePTTransport.cu
 )
 target_include_directories(AdePT_G4_integration
   PUBLIC

include/AdePT/core/AdePTConfiguration.hh

@@ -25,8 +25,9 @@ std::shared_ptr<AdePTTransportInterface> AdePTTransportFactory(unsigned int nThr
 ///
 class AdePTConfiguration {
 public:
-  AdePTConfiguration();
-  ~AdePTConfiguration();
+  AdePTConfiguration() : fAdePTConfigurationMessenger{new AdePTConfigurationMessenger(this)} {}
+  ~AdePTConfiguration() {}
+  void SetNumThreads(int numThreads) { fNumThreads = numThreads; }
   void SetRandomSeed(int randomSeed) { fRandomSeed = randomSeed; }
   void SetTrackInAllRegions(bool trackInAllRegions) { fTrackInAllRegions = trackInAllRegions; }
   void AddGPURegionName(std::string name) { fGPURegionNames.push_back(name); }
@@ -43,6 +44,7 @@ public:
 
   bool GetTrackInAllRegions() { return fTrackInAllRegions; }
   bool IsAdePTActivated() { return fAdePTActivated; }
+  int GetNumThreads() { return fNumThreads; };
   int GetVerbosity() { return fVerbosity; };
   int GetTransportBufferThreshold() { return fTransportBufferThreshold; }
   int GetCUDAStackLimit() { return fCUDAStackLimit; }
@@ -51,14 +53,13 @@ public:
   double GetMillionsOfHitSlots() { return fMillionsOfHitSlots; }
   std::vector<std::string> *GetGPURegionNames() { return &fGPURegionNames; }
 
-  std::shared_ptr<AdePTTransportInterface> CreateAdePTInstance(unsigned int nThread);
-
   // Temporary
   std::string GetVecGeomGDML() { return fVecGeomGDML; }
 
 private:
   bool fTrackInAllRegions{false};
   bool fAdePTActivated{true};
+  int fNumThreads;
   int fRandomSeed;
   int fVerbosity{0};
   int fTransportBufferThreshold{200};

include/AdePT/core/AdePTTransport.h

@@ -19,6 +19,7 @@
 #include "CommonStruct.h"
 #include <AdePT/core/AdePTScoringTemplate.cuh>
 #include <AdePT/core/HostScoringStruct.cuh>
+#include <AdePT/core/AdePTConfiguration.hh>
 
 class G4Region;
 struct GPUstate;
@@ -32,7 +33,8 @@ class AdePTTransport : public AdePTTransportInterface {
   using TrackBuffer                = adeptint::TrackBuffer;
   using VolAuxArray                = adeptint::VolAuxArray;
 
-  AdePTTransport() = default;
+  // AdePTTransport() = default;
+  AdePTTransport(AdePTConfiguration &configuration);
 
   ~AdePTTransport() { delete fScoring; }
 
@@ -76,8 +78,8 @@ class AdePTTransport : public AdePTTransportInterface {
 
 private:
   static inline G4HepEmState *fg4hepem_state{nullptr}; ///< The HepEm state singleton
-  static inline int fCapacity{1024 * 1024};            ///< Track container capacity on GPU
-  static inline int fHitBufferCapacity{1024 * 1024};   ///< Capacity of hit buffers
+  int fCapacity{1024 * 1024};                          ///< Track container capacity on GPU
+  int fHitBufferCapacity{1024 * 1024};                 ///< Capacity of hit buffers
   int fNthreads{0};                                    ///< Number of cpu threads
   int fMaxBatch{0};                                    ///< Max batch size for allocating GPU memory
   int fNumVolumes{0};                                  ///< Total number of active logical volumes

include/AdePT/core/AdePTTransport.icc

@@ -38,6 +38,22 @@ void ShowerGPU(IntegrationLayer &integration, int event, TrackBuffer &buffer, GP
 
 } // namespace adept_impl
 
+template <typename IntegrationLayer>
+AdePTTransport<IntegrationLayer>::AdePTTransport(AdePTConfiguration &configuration)
+{
+  fDebugLevel = 0;
+  fBufferThreshold = configuration.GetTransportBufferThreshold();
+  fMaxBatch = 2 * configuration.GetTransportBufferThreshold();
+  fTrackInAllRegions = configuration.GetTrackInAllRegions();
+  fGPURegionNames = configuration.GetGPURegionNames();
+  fCUDAStackLimit = configuration.GetCUDAStackLimit();
+  fCapacity = 1024 * 1024 * configuration.GetMillionsOfTrackSlots() / configuration.GetNumThreads();
+  fHitBufferCapacity = 1024 * 1024 * configuration.GetMillionsOfHitSlots() / configuration.GetNumThreads();
+
+  printf( "AdePT Allocated track capacity: %d tracks\n", fCapacity);
+  printf( "AdePT Allocated step buffer capacity: %d tracks\n", fHitBufferCapacity);
+}
+
 template <typename IntegrationLayer>
 bool AdePTTransport<IntegrationLayer>::InitializeField(double bz)
 {

include/AdePT/integration/AdePTTrackingManager.hh

@@ -9,6 +9,7 @@
 
 #include "globals.hh"
 #include <AdePT/core/AdePTTransportInterface.hh>
+#include <AdePT/core/AdePTTransport.h>
 #include "AdePT/copcore/SystemOfUnits.h"
 #include <AdePT/integration/AdePTGeant4Integration.hh>
 #include <AdePT/core/AdePTConfiguration.hh>
@@ -49,9 +50,9 @@ private:
   /// @brief Steps a track using the Generic G4TrackingManager until it enters a GPU region or stops
   void StepInHostRegion(G4Track *aTrack);
 
+  static inline int fNumThreads{0};
   std::set<G4Region const *> fGPURegions{};
   int fVerbosity{0};
-
   std::shared_ptr<AdePTTransportInterface> fAdeptTransport;
   AdePTConfiguration *fAdePTConfiguration;
   unsigned int fTrackCounter{0};

src/AdePTTrackingManager.cc

@@ -28,21 +28,25 @@ AdePTTrackingManager::~AdePTTrackingManager()
 
 void AdePTTrackingManager::InitializeAdePT()
 {
-  const auto num_threads = G4RunManager::GetRunManager()->GetNumberOfThreads();
-
   // Check if this is a sequential run
   G4RunManager::RMType rmType = G4RunManager::GetRunManager()->GetRunManagerType();
   bool sequential             = (rmType == G4RunManager::sequentialRM);
 
   // One thread initializes common elements
   auto tid = G4Threading::G4GetThreadId();
   if (tid < 0) {
+    // Only the master thread knows the actual number of threads, the worker threads will return "1"
+    // This value is stored here by the master in a static variable, and used by each thread to pass the 
+    // correct number to their AdePTConfiguration instance
+    fNumThreads = G4RunManager::GetRunManager()->GetNumberOfThreads();
+    fAdePTConfiguration->SetNumThreads(fNumThreads);
+
     // Load the VecGeom world in memory
     AdePTGeant4Integration::CreateVecGeomWorld(fAdePTConfiguration->GetVecGeomGDML());
 
     // Create an instance of an AdePT transport engine. This can either be one engine per thread or a shared engine for
     // all threads.
-    fAdeptTransport = fAdePTConfiguration->CreateAdePTInstance(num_threads);
+    fAdeptTransport = std::make_shared<AdePTTransport<AdePTGeant4Integration>>(*fAdePTConfiguration);
 
     // Initialize common data:
     // G4HepEM, Upload VecGeom geometry to GPU, Geometry check, Create volume auxiliary data
@@ -54,7 +58,8 @@ void AdePTTrackingManager::InitializeAdePT()
   } else {
     // Create an instance of an AdePT transport engine. This can either be one engine per thread or a shared engine for
     // all threads.
-    fAdeptTransport = fAdePTConfiguration->CreateAdePTInstance(num_threads);
+    fAdePTConfiguration->SetNumThreads(fNumThreads);
+    fAdeptTransport = std::make_shared<AdePTTransport<AdePTGeant4Integration>>(*fAdePTConfiguration);
     // Initialize per-thread data
     fAdeptTransport->Initialize();
   }