长期和中期调度程序之间的区别

先决条件 – 进程调度程序
长期调度程序：
长期调度程序称为作业调度程序。长期调度程序控制在系统内选择进行处理的程序。在这种情况下，程序在队列中被发现，因此根据需要选择最好的一个作业，它从作业池中选择进程并将这些进程加载到内存中以执行。它提供了对多道程序程度的限制。

中期调度程序：
中期调度程序称为进程交换调度程序，因为它是交换的一部分。通过这个调度程序，进程从内存中删除。中期调度器减少了多道程序的程度。在这个调度程序中，如果一个进程请求 I/O，它可以被挂起，并且它不能在完成挂起的进程方面取得任何进展。在这种情况下，为了从内存中清除该方法并为其他进程腾出空间，将挂起的进程移动到辅助存储中。此过程称为交换，因此声称该过程已被换出或展开。交换也可能是必要的，以增强工艺组合。

让我们看看 Long-Term 和 Medium-Term Scheduler 之间的区别：

S.NO	Long-Term Scheduler	Medium-Term Scheduler
1.	Long-term scheduler is called as job scheduler.	Whereas medium-term scheduler is called as process swapping scheduler.	2.	In long-term scheduler, the process are selected from the job pool and these process are loaded into memory in order to execute.	While in this, process can be revived in the memory as well as process execution can also be carried out.
3.	Long-term scheduler is can be or can’t be a part of a time sharing system. if it is then it is a nominal in time sharing system.	While medium-term scheduler is always in a time sharing system.
4.	The speed of long -term scheduler is less than medium-term scheduler.	While the speed of medium -term scheduler is comparatively higher than longer-term scheduler.
5.	Long-term scheduler provides the restraint on the DOM(Degree of Multi-programming).	While medium-term scheduler cut down the degree of DOM(Degree of Multi-programming).