实时任务的相对截止时间和绝对截止时间的区别

1. 相对截止日期：
任务开始到实时任务完成之间的时间间隔称为相对截止时间。它基本上是实时任务的到达和相应的截止日期之间的时间间隔。
如果任务到达时间为’t’，对应的任务截止时间为’t+d’，则

Relative deadline = d 

2. 绝对截止日期：
从时间 0 到实时任务完成之间的时间间隔称为相对截止时间。它基本上是时间 0 和实时任务对应的截止时间之间的时间间隔。
如果到达时间为’t’，对应的任务截止时间为’t+d’，则

Absolute deadline = t+d 

实时任务的相对截止时间和绝对截止时间的区别：

RELATIVE DEADLINE	ABSOLUTE DEADLINE
It is time interval between arrival and corresponding deadline of the task.	It is time interval between time 0 and corresponding deadline of the task.
It depends on the arrival time of the task.	It does not depend on the arrival time of the task.
It is mostly used in computational work.	It is not used in computation work.
If A.T of task is t and deadline is (t+d), relative deadline is ‘d’.	If A.T of task is t and deadline is (t+d), absolute deadline is (t+d).
It may be less than or equal to absolute deadline.	It is always greater than or equal to relative deadline.
It is maximum allowed response time of real-time task.	It is sum of release time and relative deadline.