Summary of "L-1.5: Process States in Operating System| Schedulers(Long term,Short term,Medium term)"

Summary of Video: L-1.5: Process States in Operating System | Schedulers (Long term, Short term, Medium term)

Main Ideas and Concepts:

Process States and Life Cycle:
The video discusses the various states that a process goes through from creation to termination, referred to as the process life cycle. The states include New, Ready, Running, Terminated, and Waiting/Blocked.
Primary States:
- New State: The process is created and stored in secondary memory, not yet executed.
- Ready State: The process is loaded into RAM and is ready to be executed.
- Running State: The process is currently being executed by the CPU.
- Terminated State: The process has completed execution and resources are deallocated.
- Waiting/Blocked State: The process cannot continue until a specific event occurs (e.g., completion of an I/O operation).
Schedulers:
- Long Term Scheduler: Responsible for bringing processes into the ready state, promoting multi-programming.
- Short Term Scheduler: Responsible for selecting processes from the ready queue to execute on the CPU. It can operate in pre-emptive (interrupts current process) or non-pre-emptive (lets current process finish) modes.
- Medium Term Scheduler: Manages processes that need to be temporarily suspended and moved to secondary memory to free up RAM.
I/O Requests:
When a process requires I/O, it goes into the waiting state. Once the I/O operation completes, it returns to the ready state.
Additional States:
- Suspend Wait/Block State: When the waiting queue is full, processes may be suspended and moved to secondary memory.
- Suspend Ready State: Similar to the suspend wait state but applies to processes in the ready queue when it is full.
Examples of Scheduling:
The video uses analogies and examples, such as supermarket billing, to explain how processes are managed based on priority and time quantum.
Practical Application:
The video highlights how to view processes in operating systems like Windows (using Task Manager) and UNIX/Linux (using the ps command).

Key Instructions/Methodology:

Understand the definitions and functions of each process state.
Familiarize yourself with the roles of long-term, short-term, and medium-term Schedulers.
Recognize the difference between pre-emptive and non-pre-emptive scheduling.
Learn how I/O requests affect Process States and the overall scheduling mechanism.