Is time sharing os has no long term scheduler?

What is difference between a scheduler and a dispatcher?

DISPATCHER?The dispatcher is the module that gives control of the CPU to the process selected by the short-time scheduler(selects from among the processes that are ready to execute).The function involves :Swithching contextSwitching to user modeJumping to the proper location in the user program to restart that program.SCHEDULER? Normally there are 3 types of schedulers are available in operating systems.1. Long term scheduler2. Mid term scheduler3. Short term schedulerThe short term scheduler is also called as the dispatcher which selects the process from the waiting queue and allocates the CPU to that process.Whereas the Long term scheduler (Admission scheduler) decides which process should be placed in the main memory and updates the waiting queue. This long scheduler is important in the large bound systems like super computers and may not be used frequently as the short term scheduler.The mis term scheduler available in all systems which is responsible for the swapping in and out operations which means loading the process into, main memory from secondary memory (swap in) and take out the process from main memory and store it into the secondary memory (swap out).

What is the duty of a scheduler?

We differentiate between the dispatcher and the scheduler as the scheduler works on a longer time span to ensure eve workload. The dispatcher can the focus on the shorter time, see what is best suited candidate to be given a time slot, and avoid "fairness" such as attempt for monopolizing the resources. The scheduler's time interval is small enough to allow real time events, there are millions of things that can be executed for every 20th millisecond.

Long term schedular controls the degree of multiprogrammingExplain?

hi, Work of long term schedular is to admit new process to ready queue(forked() or program form disk ). Multiporgramming means having more than one processes in the memory(RAM) at a same time(may not be executing). so as long term scheduler brings new processes into the memmory we can say it controlls the degree(#process in RAM) of multiprogramming.

If you want to automatically defragment you can set a predetermined time using the?

the task scheduler

What are the long term plans?

Long- Term plans are similar to Long- Term goals. Long- Term goals are goals that you plan to accomplish over a long period of time. So Long-Term plans are plans that you hava and want to do over a long time.

Explain the difference between a planner and a scheduler?

A planner is a calendar or diary with which you can roughly plan the activities which you will undergo but a scheduler is a calendar or diary that you maintain so as to plan the activities accurately on time.

Why do you use disk scheduling in operating systems?

Disk Scheduling and Task Scheduler and different terms. Disk Scheduling: Input / Output Scheduling or I/O Scheduling is a term used to describe the method computer operating systems decide the order that block I/O. Task Scheduler: Task Scheduler is a component of Microsoft Windows that provides the ability to schedule the launch of programs or scripts at pre-defined times or after specified time intervals. It was first introduced in the Windows 95 Plus! pack as System Agent [1] but was renamed to Task Scheduler in Windows 98. The Windows Event Log service must be running before the Task Scheduler starts up.

What is a slang term for in a long time?

A slang term for "a long time" is "a minute."Example: "Yo, I haven't seen my brother in a minute"

What is the meaning of long term?

Long term means something that is prolonged over a large segment of time. This time can be for things such as business and also things like long term goals.

What is short term and long term memory?

Short term memory is where you store stuff that you won't need for a very long time. Long term is the opposite.

How you handle multi task?

Multi-tasking is a function of the operating system and gives the impression that two or more programs are running simultaneously. Systems that have two or more independent processors or cores are obviously capable of running two or more programs simultaneously, however only one program can physically run on any one core at any one point in time, and the number of running programs (or threads, since programs can be multi-threaded) typically exceeds the number of physical cores available. Thus programs must be scheduled so they each get a fair share of CPU time. At the heart of the scheduler is the dispatcher followed by the short-term, mid-term and long term schedulers. The dispatcher is responsible for the low-level context switching. Switching tasks incurs a dispatch latency which means the CPU is momentarily idle. Thus the dispatcher must not only operate extremely quickly but must avoid any unnecessary context switching. The short-term scheduler is responsible for selecting tasks for dispatch. Typically, the short-term scheduler runs after every time slice and can force tasks off the CPU (pre-emptive scheduling). The mid-term scheduler is responsible for swapping tasks between memory and page files while the long-term scheduler decides which tasks should be admitted to the ready queue. Between them, the schedulers prioritise tasks to ensure every task gets a fair share of the CPU, with higher priority tasks taking more time-slices than low-priority tasks. This is achieved through a variety of algorithms often used in some combination, such as first in first out, round robin, shortest job first, fixed-priority pre-emptive scheduling and multi-level scheduling, amongst others.

What is the diffence of a long term cause and a short term cause?

A long term cause is something that lasts a longer time and a short term cause is something that lasts a shorter time.