Hi, I was reading a link that gave some information about real-time scheduling. There was the example given that I didn't understand

For Example, in a real-time scheduling algorithm a deadline could be set to five nano-seconds. In a critical operation the task must be processed in the time specified by the deadline (i.e. five nano-seconds). A task in a real-time system must be completed “neither too early nor too late.

Taking an example will be a little easier to understand. Can anyone tell what are the examples of tasks in the real world that should be completed in such a short time

 

Are you sure it is five nano-seconds?
5ns is extremely short. The reciprocal of 5ns is 200MHz. This would require a CPU to be running with a clock frequency multiple times faster than 200MHz.

What type of computer system is this?

 

Are you sure it is five nano-seconds?
5ns is extremely short. The reciprocal of 5ns is 200MHz. This would require a CPU to be running with a clock frequency multiple times faster than 200MHz.

What type of computer system is this?

The example given in this page example is in the first paragrap

 

Ok, that is a hypothetical situation. I am not aware of any RTOS that can schedule events with 5ns resolution.

 

Ok, that is a hypothetical situation. I am not aware of any RTOS that can schedule events with 5ns resolution.

okay, What are the examples of tasks in the real world that may be schedule for a short time.
Can you give some examples.

 

Adjusting speed/pitch of rotors. Robotic response to external inputs.

 

Agreed. Controlling the speed of the motors on a quadcopter would be an extremely demanding application.

 

Controlling a stepper motor at high RPM.

Bob

 

Just how fast is a nanosecond in a real-time control system?