Class Descriptions and Interactions

The PPF will be designed using a minimum of five classes distinguished by responsibility.

• PPF_Interface Facade class whose responsibilities are as follows:
  • knows which subsystems' classes are responsible for a request
  • delegates client requests to appropriate subsystem objects
• PPF_Statistics Keeps track of statistics for each run including:
  • number of particles sent from current node
  • number of particles received from each neighbor
  • average time for send and receives
  • average time between send and receives
  • time it took for the run from initialization to conclusion
• PPF_Timer Simple utility timer accurate to milliseconds
• PPF_Logic Handles all logic for particle passing, including:
  • which domains to pass particles too
  • which domains to receive particles from
  • if not enough particles are in a list don't send it (unless the send is forced)
  • if the current node is out of memory, write particles to disk
• PPF_Parallel_Wrapper Wrapper class to abstract all parallel calls to MPI

Figure 8.1 shows a general block diagram of class interactions in the PPF.

 
Figure: Flow of particle interactions in a package using PPF