Chapter 4: Threads
4.1.2Benefits
Responsiveness(一个block，另一个能用)
Resource Sharing
Economy
Scalability(input多一點，速度成比例增長)
Multicore Programming
Multicore systems putting pressure on programmers, challenges include
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Dividing activities
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Balance
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Data splitting
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Data dependency
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Testing and debugging
Multithreaded Server Architecture