High concurrency and parallel programming of concurrent

• Concurrency: period there are many threads or processes in execution, but what point in time only one in execution, multiple threads or processes take turns fighting for time slice execution.

• Parallel: the time period and the point has multiple threads or processes in execution.

　　

　　　　　　　　　　　　　　　　　　　Concurrent execution on a single-core system of FIG.

     
　　　　　　　　　　　　　　Parallel on multi-core system of FIG. 2 perform