实时任务的相对截止期限与绝对截止期限之间的差异

1.相对截止日期：
任务开始与实时任务完成之间的时间间隔称为“相对期限”。基本上是到达时间和相应的实时任务期限之间的时间间隔。
如果任务的到达时间为“ t”，而任务的相应截止日期为“ t + d”，

Relative deadline = d 

2.绝对截止日期：
从时间0到完成实时任务之间的时间间隔称为相对期限。它基本上是时间0与实时任务的相应截止日期之间的时间间隔。
如果到达时间为“ t”，相应的任务期限为“ t + d”，

Absolute deadline = t+d 

实时任务的相对截止期限和绝对截止期限之间的区别：

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.