General import of event-based model from old branch. Seems to work, but need to test then work on cleaning up some more.

include/openmc/event.h

@@ -0,0 +1,84 @@
+#ifndef OPENMC_EVENT_H
+#define OPENMC_EVENT_H
+
+#include "openmc/particle.h"
+#include "openmc/tallies/filter.h"
+
+#include <vector>
+
+
+namespace openmc {
+
+//==============================================================================
+// Structs
+//==============================================================================
+
+struct QueueItem{
+  int64_t idx;      // particle index in event-based buffer
+  double E;     // particle energy
+  int material; // material that particle is in
+  Particle::Type type;
+  bool operator<(const QueueItem& rhs) const
+  {
+    // First, compare by type
+    if (type < rhs.type) {
+      return true;
+    } else if (type > rhs.type) {
+      return false;
+    }
+
+    // At this point, we have the same particle types.
+    // Now, compare by material
+
+    // TODO: Temporarily disabled as SMR problem has different material IDs for every pin
+    // Need to sort by material type instead...
+    /*
+       if( material < rhs.material)
+       return true;
+       if( material > rhs.material)
+       return false;
+       */
+
+    // At this point, we have the same particle type, in the same material.
+    // Now, compare by energy
+    return (E < rhs.E);
+  }
+};
+
+//==============================================================================
+// Global variable declarations
+//==============================================================================
+//
+namespace simulation {
+
+extern std::unique_ptr<QueueItem[]> calculate_fuel_xs_queue;
+extern std::unique_ptr<QueueItem[]> calculate_nonfuel_xs_queue;
+extern std::unique_ptr<QueueItem[]> advance_particle_queue;
+extern std::unique_ptr<QueueItem[]> surface_crossing_queue;
+extern std::unique_ptr<QueueItem[]> collision_queue;
+extern std::unique_ptr<Particle[]>  particles;
+extern int64_t calculate_fuel_xs_queue_length;
+extern int64_t calculate_nonfuel_xs_queue_length;
+extern int64_t advance_particle_queue_length;
+extern int64_t surface_crossing_queue_length;
+extern int64_t collision_queue_length;
+extern int64_t max_particles_in_flight;
+
+} // namespace simulation
+
+//==============================================================================
+// Functions
+//==============================================================================
+
+void init_event_queues(int64_t n_particles);
+void free_event_queues(void);
+void dispatch_xs_event(int64_t i);
+void process_calculate_xs_events(QueueItem* queue, int64_t n);
+void process_advance_particle_events();
+void process_surface_crossing_events();
+void process_collision_events();
+void process_death_events(int64_t n_particles);
+
+} // namespace openmc
+
+#endif // OPENMC_EVENT_H

include/openmc/simulation.h

@@ -95,6 +95,9 @@ void transport_history_based_single_particle(Particle& p);
 //! Simulate all particle histories using history-based parallelism
 void transport_history_based();
 
+//! Simulate all particle histories using event-based parallelism
+void transport_event_based();
+
 } // namespace openmc
 
 #endif // OPENMC_SIMULATION_H