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Ch4 行程與執行緒管理
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32. Context Switching、CFS、Dispatcher、Thread Creation
#OS-04-032
中
Context Switching
CFS
Dispatcher
Thread Creation
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Which of the following statements on process scheduler and thread is (are) true?
A
(a) Context switching is typically faster between threads than between processes. The reason is that threads share resources, including page table and user stack, of the process to which they belong.
B
(b) In Linux, Completely Fair Scheduler (CFS) allocates a larger time quantum to higher-priority processes. Processes with the same priority will receive the same time quantum.
C
(c) The dispatcher involved in the process scheduler switches process contexts between the current and the next-scheduled user processes in the user mode so as to minimize the dispatching latency.
D
(d) In contrast, during thread creation, the new thread shares many data structures (like memory space and file descriptors) with the parent process instead of copying them.
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