SPMD Model

SPMD model relies on:

• arrays of processors,
• distributed data,
• some global data,
• message passing between processors,
• loose synchronisation,

Each processor runs the same executable program so the message passing must be masked by IF statements, for example,

  
Figure 17: An Example of Message Passing Between Two Processors in a SPMD System

Loose synchronisation means that it is occasionally necessary for processors to synchronise. The processors do not have to operate in lockstep!