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陳同學 於 報告/作業 分享經驗 12/16 12/11OS作業

12/16 12/11OS作業
名稱 12/11OS作業
日期 12/16
課程名稱 作業系統
指導教師 劉艾華

I. What kind of strategies we can have for using thread pools?
1.The number of threads in the pool can be set heuristically based upon system factors.
2.More sophisticated thread-pool architectures can dynamically adjust the number of threads in the pool according to usage patterns.

II. Why the windows uses one to one mapping for the threads while there are many to many available?
One-to-one model provides more concurrency. It also another thread to run when a thread makes a blocking system call. It supports multiple thread to execute in parallel on microprocessors.

III. Specify the differences between processes and threads.
1.Threads share the address space of the process that created it; processes have their own address space.
2.Threads have direct access to the data segment of its process; processes have their own copy of the data segment of the parent process.
3.Threads can directly communicate with other threads of its process; processes must use inter-process communication to communicate with sibling processes.
4.Threads have almost no overhead; processes have considerable overhead.
5.New threads are easily created; new processes require duplication of the parent process.
6.Threads can exercise considerable control over threads of the same process; processes can only exercise control over child processes.
7.Changes to the main thread (cancellation, priority change, etc.) may affect the behavior of the other threads of the process; changes to the parent process does not affect child processes.

更新日期：2015/12/16 下午 10:50:42