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What else can I help you with?
How do you decide what gets top priority when scheduling time?
it depends what is critical to meet deadline.
Advantage and disadvantage of priority scheduling?
Advantages of Priority Scheduling-1.Simplicity.2.Reasonable support for priority.3.Suitable for applications with varying time and resource requirements.Disadvantages of Priority Scheduling-1.Indefinite blocking or starvation.2.A priority scheduling can leave some low priority waiting processes indefinitely for CPU.3.If the system eventually crashes then all unfinished low priority processes gets lost.
What scheduling algo is used for real time OS?
Cooperative schedulingPreemptive scheduling Rate-monotonic schedulingRound-robin schedulingFixed priority pre-emptive scheduling, an implementation of preemptive time slicingFixed-Priority Scheduling with Deferred PreemptionFixed-Priority Non-preemptive SchedulingCritical section preemptive schedulingStatic time schedulingEarliest Deadline First approachStochastic digraphs with multi-threaded graph traversal
What will happen if two processes are having same priority in priority scheduling?
In priority scheduling, if two processes have the same priority, some operating systems may use a secondary criteria, such as time since last execution or process ID, to determine the order in which they are executed. Alternatively, the operating system may use a first-come-first-serve basis for scheduling processes with the same priority.
What is the Least Slack Time scheduling algorithm used for?
The Least Slack Time scheduling algorithm is used for assigning priority based on the slack time (temporal difference between the deadline, ready time and run time) of a process.
What type of scheduling is there in RTOS?
A scheduler is the heart of every RTOS. It provides the algorithms to select the task for execution. Three common scheduling algorithms are > Cooperative scheduling > Round-robin scheduling > Preemptive scheduling RTOS uses preemptive (priority based) scheduling. In some cases, real-time requirements can be met by using static scheduling.
What relation between priority and shortest job first?
In that work system, the shortest job gets higher priority because more gets accomplished in any amount of time. If you have two hours to do 4 tasks and one task will take five minutes, one will take 30 minutes, one will take an hour and one will take an hour and a half, by using the shortest job first method, you will accomplish three tasks in those two hours and part of the fourth task. If you do the longest job first, you will accomplish the task that takes an hour and a half, then only part of the one hour task, but nothing on the 5 minute or 30 minute tasks. That means that by doing the shortest jobs first, you will accomplish three times as many tasks as you will by doing the longest jobs first.
What are the relationships between priority and FCFS of CPU scheduling algorithms?
this is my doubt about the non-preemptive priority scheduling. i m doing bachelor of engineering in IT and this question in end semester exam. the question is as follows:Assume you have the following jobs to be executed with one processor, with the jobs arriving in the order listed here:Process Burst Time PriorityP1 80 5P2 20 1P3 10 3P4 20 2P5 50 4Suppose the system uses priority scheduling. Draw Gantt chart and calculate average waiting time for the processes.My doubt is:suppose if we were to use non-preemptive priority scheduling, the question says the jobs arriving in the order listed, so as per the order P1 will arrive first so it will get the CPU first and in non-preemptive once a job gets CPU it will not leave CPU till the process finishes, then as per the order P2 will come and same thing repeats.... so it acts like FCFS scheduling and priority is of no use here. But my lecturer says we have to follow the priority and P2 will come first, but the line the jobs arriving in the order listed is still not letting me agree with my lecturer. Can anyone help out?
What items of information about a task might be useful in real time scheduling?
Ready time, starting deadline, completion deadline, processing time, resource requirements, priority, subtask structure.
How does RTOS determine the Time frame If suppose you are having an event with Highest priority and if its goes on to the Infinity loop how it handles this situation being deterministic in behavior?
There are different scheduling mechanisms that RTOSes can use to be deterministic. The most common is preemptive scheduling. In this model, each task has a relative priority. The highest priority task that is ready to run gets control of the processor. This is what provides deterministic behavior. When no task is ready to run the system will go to the idle loop. An RTOS is simply a tool to acheive a deterministic system. It is up to the developer to build a system that is capable of meeting its deadlines. A poorly designed system can encounter situations where important tasks do not get processor time because a higher priority task has not released.
Hard and soft real-time scheduling?
Soft real-time scheduling means that, while processor and other scheduling algorithms may be optimized to give preference to higher-priority processes, no absolute guarantee of performance can be made. The hard real-time computer is designed for specialized purposes, where even the smallest amount of latency can make the difference between life and death.
What is the difference between conventional C and embedd C?
Advantages: - Priority based premptive scheduling -multitasking -multithreading -better response time -valuable services like senaphore,mailbox,queues etc. Disadvantages: -expensive Advantages: - Priority based premptive scheduling -multitasking -multithreading -better response time -valuable services like senaphore,mailbox,queues etc. Disadvantages: -expensive
