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ÇÁ·Î¼¼¼­½ºÄÉÁÙ¸µÀÇ À¯Çü (¿µ¹®)

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2019.09.19
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32 page / 1.83 MB
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  processor scheduling  scheduling  
assign system resource (cpu time, io device, etc.) to processes/threads to meet system objectives, such as response time, turnaround time, throughput, or fairness
in practice, these goals often conflict  three types of scheduling   long-term scheduling (admission scheduler)  
decide which jobs/processes to be admitted to the ready queue
admission to the set of currently executing processes
mid-term scheduling (swapper)  
remove processes from main memory and place them on secondary memory, or vice versa
swap in/out processes  
short-term scheduling (cpu scheduler or dispatcher)
decide which of the ready, in-memory processes to be executed by the processor following a clock interrupt, io interrupt, or os call
execute most frequently    scheduling and process state transitions  source: pearson    nesting of scheduling functions  source: pearson    queuing diagram  source: pearson    long-term scheduler  
determines which programs are admitted to the system for processing
once admitted a user program becomes a process
controls the degree of multiprogramming  
the more processes that are created, the smaller the percentage of time that each process can be executed
may limit the degree of multiprogramming to provide satisfactory service to the current set of processes
or, may increase the degree of multiprogramming if cpu is idle too long
which jobs to admit next can be   first come, first served (fcfs), or  
priority, expected execution time, i/o requirements
for interactive programs in a time-sharing system
os will accept all authorized comers until the system is saturated
  short-term scheduling criteria  
the main objective of short-term scheduling is to allocate processor time to optimize system behaviour
can be categorized into two dimensions   user-oriented criteria  
relate to the behaviour of the system as perceived by the individual user or process (such as response time in an interactive system)
important on virtually all systems   system-oriented criteria  
focus on efficient utilization of the processor such as throughput
generally of minor importance on single-user systems
performance-related criteria  quantitative and can be measured  example: response time, throughput   not performance-related criteria  qualitative and hard to measure  example: predictability    scheduling criteria  source: pearson    priority queuing  ready queue with the highest priority  ready queue with the lowest priority  
may suffer from starvation!   (ÀÌÇÏ »ý·«)

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