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 Java  |  Question 31 of 921    Print  
What is the difference between preemptive scheduling and time slicing
Under preemptive scheduling, the highest priority task executes until it enters the waitingor dead states or a higher priority task comes into existence. Under time slicing, a taskexecutes for a predefined slice of time and then reenters the pool of ready tasks. Thescheduler then determines which task should execute next, based on priority andother factors.


  
Total Answers and Comments: 1 Last Update: March 10, 2006   
  
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March 10, 2006 05:13:50   #1  
ramu        

RE: What is the difference between preemptive scheduli...

1.    Pre-emptive Scheduling.

Ways for a thread to leave running state -

·         It can cease to be ready to execute ( by calling a blocking i/o method)

·         It can get pre-empted by a high-priority thread, which becomes ready to execute.

·         It can explicitly call a thread-scheduling method such as wait or suspend.

 

·         Solaris JVM’s are pre-emptive.

·         Windows JVM’s were pre-emptive until Java 1.0.2

 

2.    Time-sliced or Round Robin Scheduling

·         A thread is only allowed to execute for a certain amount of time. After that, it has to contend for the CPU (virtual CPU, JVM) time with other threads.

·         This prevents a high-priority thread mono-policing the CPU.

·         The drawback with this scheduling is – it creates a non-deterministic system – at any point in time, you cannot tell which thread is running and how long it may continue to run.

 

·         Mactinosh JVM’s

·         Windows JVM’s after Java 1.0.2


 
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