G4WorkerThread.cc

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//
#include "G4WorkerThread.hh"
#include "G4WorkerRunManager.hh"
#include "G4MTRunManager.hh"

#include "G4GeometryWorkspace.hh"
#include "G4GeometryWorkspacePool.hh"
#include "G4SolidsWorkspace.hh"
#include "G4SolidsWorkspacePool.hh"
#include "G4ParticlesWorkspace.hh"
#include "G4PhysicsListWorkspace.hh"

#include "G4Region.hh"
#include "G4RegionStore.hh"
#include "G4LogicalVolume.hh"
#include "G4Region.hh"
#include "G4PhysicalVolumeStore.hh"
#include "G4LogicalVolumeStore.hh"

void G4WorkerThread::SetThreadId(G4int tid)
{
    threadId = tid;
}

G4int G4WorkerThread::GetThreadId() const
{
    return threadId;
}

void G4WorkerThread::SetNumberThreads(G4int nw)
{
    numThreads = nw;
}

G4int G4WorkerThread::GetNumberThreads() const
{
    return numThreads;
}

void G4WorkerThread::BuildGeometryAndPhysicsVector()
{
    // Initialise all split classes in the geometry
    // with copy of data from master thread

    G4GeometryWorkspacePool::GetInstance()->CreateAndUseWorkspace();
    G4SolidsWorkspacePool::GetInstance()->CreateAndUseWorkspace();
    G4ParticlesWorkspace::GetPool()->CreateAndUseWorkspace();
    G4PhysicsListWorkspace::GetPool()->CreateAndUseWorkspace();
}

void G4WorkerThread::DestroyGeometryAndPhysicsVector()
{
    // Initialise all split classes in the geometry
    // with copy of data from master thread

    G4GeometryWorkspacePool::GetInstance()->CleanUpAndDestroyAllWorkspaces();
    G4SolidsWorkspacePool::GetInstance()->CleanUpAndDestroyAllWorkspaces();
    G4ParticlesWorkspace::GetPool()->CleanUpAndDestroyAllWorkspaces();    
    G4PhysicsListWorkspace::GetPool()->CleanUpAndDestroyAllWorkspaces();
}

void G4WorkerThread::UpdateGeometryAndPhysicsVectorFromMaster()
{
    // =================================================
    // Step-0: keep sensitive detector and field manager
    // =================================================
    // First remember SD and Filed Associated with worker
    // in order to re-use it
    // (note that all the stuff after this will reset SD and Field)
    typedef std::map<G4LogicalVolume*,
            std::pair<G4VSensitiveDetector*,G4FieldManager*> > LV2SDFM;
    LV2SDFM lvmap;

    typedef std::map<G4Region*,
            std::pair<G4FastSimulationManager*,G4UserSteppingAction*> > R2FSM;
    R2FSM rgnmap;

    G4LogicalVolumeStore* mLogVolStore = G4LogicalVolumeStore::GetInstance();
    for(size_t ip=0; ip<mLogVolStore->size(); ip++)
    {
        G4LogicalVolume *lv = (*mLogVolStore)[ip];

        // The following needs an explanation.
        // Consider the case in which the user adds one LogVolume between
        // the runs. The problem is that the thread-local part (split class)
        // of the G4LogicalVolume object is not initialized for workers
        // because the initialization is done once when the thread starts
        // (see G4MTRunManagerKernel::StartThread Step-2 that calls
        // G4WorkerThread::BuildGeometryAndPhysicsVector in this class).
        // The problem is that pointers of SD and FM for these newly added LV
        // may be invalid pointers (because never initialized, we have seen
        // this behavior in our testing). If now we remember them and re-use
        // them in Step-4 below we set invalid pointers to LV for this thread.
        // Thus we need a way to know if for a given LV we need to remember
        // or not the SD and FM pointers.
        // To solve this problem: We assume that the ConstructSDandField() is
        // called also by Master thread, thus for newly added LV the shadow
        // pointers of SD and Fields are correct.
        // (LIMITATION: this assumption may be too stringent, a user to save
        // memory could instantiate SD only for workers, but we require this
        // not to happen!).
        // Thus if a SD and FieldMgr are needed for this particular LV, and
        // shadow are !=0 it means that user wants an SD and FM to be
        // associated with LV, we get the values and we remember them.
        //
        G4VSensitiveDetector* sd = 0;
        G4FieldManager* fmgr = 0;
        if ( lv->GetMasterSensitiveDetector() != 0 )
        {
           sd = lv->GetSensitiveDetector();
        }
        if ( lv->GetMasterFieldManager() != 0 )
        {
           fmgr = lv->GetFieldManager();
        }
        if ( sd || fmgr )
        {
           lvmap[lv] = std::make_pair(sd,fmgr);
        }
    }
    G4RegionStore* mRegStore = G4RegionStore::GetInstance();
    for(size_t ir=0; ir<mRegStore->size(); ir++)
    {
        G4Region* reg = (*mRegStore)[ir];
        G4FastSimulationManager* fsm = reg->GetFastSimulationManager();
        G4UserSteppingAction* usa = reg->GetRegionalSteppingAction();
        if ( reg || usa )
        {
           rgnmap[reg] = std::make_pair(fsm,usa);
        }
    }

    //===========================
    // Step-1: Clean the workspace
    //===========================
    G4GeometryWorkspace* geomWorkspace =
      G4GeometryWorkspacePool::GetInstance()->GetWorkspace();
    geomWorkspace->DestroyWorkspace();
    G4SolidsWorkspace* solidWorkspace =
      G4SolidsWorkspacePool::GetInstance()->GetWorkspace();
    solidWorkspace->DestroyWorkspace();
    
    //===========================
    // Step-2: Re-create and initialize workspace
    //===========================
    geomWorkspace->InitialiseWorkspace();
    solidWorkspace->InitialiseWorkspace();
    
    //===================================================
    // Step-4: Restore sensitive detector and field manaer
    //===================================================
    for ( LV2SDFM::const_iterator it = lvmap.begin() ;
          it != lvmap.end() ; ++it )
    {
        G4LogicalVolume* lv      = it->first;
        G4VSensitiveDetector* sd = (it->second).first;
        G4FieldManager* fmgr       = (it->second).second;
        if (fmgr) // What should be the second parameter?
        {         // We use always false for MT mode
           lv->SetFieldManager(fmgr, false);
        }   
        if (sd)
        {
           lv->SetSensitiveDetector(sd);
        }
    }
    for ( R2FSM::const_iterator it3 = rgnmap.begin() ;
          it3 != rgnmap.end() ; it3++ )
    {
        G4Region* reg = it3->first;
        G4FastSimulationManager* fsm = (it3->second).first;
        if(fsm) reg->SetFastSimulationManager(fsm);
        G4UserSteppingAction* usa = (it3->second).second;
        if(usa) reg->SetRegionalSteppingAction(usa);
    }
}

void G4WorkerThread::SetPinAffinity(G4int affinity) const
{
  if ( affinity == 0 ) return;

#if !defined(WIN32)
  G4cout << "AFFINITY SET" << G4endl;
  // Assign this thread to cpus in a round robin way
  G4int offset = affinity;
  G4int cpuindex = 0;
  if ( std::abs(offset)>G4Threading::G4GetNumberOfCores() )
  {
      G4Exception("G4WorkerThread::SetPinAffinity()","Run0100", JustWarning,
      "Cannot set thread affinity, affinity parameter larger than number of cores");
      return;
  }
  if (offset>0)  // Start assigning affinity to given CPU
  {
      --offset;
      cpuindex = (GetThreadId()+offset) % G4Threading::G4GetNumberOfCores();
      // Round robin
  }
  else  // Exclude the given CPU
  {
      offset *= -1;
      --offset;
      G4int myidx = GetThreadId()%(G4Threading::G4GetNumberOfCores()-1);
      cpuindex = myidx + (myidx>=offset);
  }
  G4cout << "Setting affinity to:" << cpuindex << G4endl;

#if defined(G4MULTITHREADED)
    // Avoid compilation warning in C90 standard w/o MT
    G4NativeThread t = pthread_self();
#else
    G4NativeThread t;
#endif
  G4bool success = G4Threading::G4SetPinAffinity(cpuindex,t);
  if ( ! success )
  {
      G4Exception("G4MTRunManagerKernel::StarThread()", "Run0101",
                  JustWarning, "Cannot set thread affinity.");
  }
#endif
}