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Parallel Processing - Coggle Diagram

- - - - Simplicity
      - Flexibility
      - Reliability
    - - Performance limited by bus cycle time
      - Leads to problems with cache coherence
        
        Can result in an inconsistent view of memory
        
        Write back policy
        
        Write through
  - - - Creates central bottleneck
    - - Increases bus traffic
      - Write invalidate
        
        Multiple readers, one writer
        
        MESI (Modified, Exclusive, Shared, Invalid)
      - Write update
        
        Multiple readers and writers
- - - - Symmetric Multiprocessor (SMP)
        
        Processors share memory
      - Non-uniform memory access (NUMA)
        
        Access times to different regions of
        memory may differ
    - - Clusters
        
        Collection of independent uniprocessors or
        SMPs
- - - - Single-threaded scalar
      - Interleaved multithreaded scalar
      - Blocked multithreaded scalar
    - - Simultaneous multithreading
      - Chip multiprocessor