FlashOs

Description

This project consists of 3 phases :

1. Scheduler
   • HPF (Highest Priority First)
   • SRTN (Shortest Remaining Time Next)
   • RR (Round Robin)
2. Memory Management
   • Buddy Algorithm
3. Producer-Consumer

System Design

Data-structures

1. 2-Level Priority Queue:
   • First level: each node represents a linked list that is sorted with the priority.
   • Second level: each linked list in the first level is a list of all processes have the same priority sorted by the arrival time.
2. Circular Queue:
   • The name “Circular” demonstrates the way we are dealing with it. We pop a process, then give it its quantum then push it at the end of the queue.
   • Optimizes the round robin algorithm as each insert – select – delete is O(1).
3. Array of linked lists for memory
   • each list represents the memory blocks with the size of this list - sizes of lists are multiples of 2 till 2 power 10 (1024 -memory size ).

IPCS

1. Semaphores
2. Message Queues
3. Shared Memory
4. Signals

• Refer to OS-Report for more details about the used methodologies and input/output samples.

• Scheduler

  • Run

     - Add your custom testcase in processes.txt
     - For random testcases run:
     $ gcc test_generator.c -o test_generator.out
     $ ./test_generator.out

       $ cd Scheduler
       $ make
       $ make run

  • Log Files

    • Refer to Scheduler Performance
    • Refer to Scheduler Log

Memory Management

$ cd Memory/Scheduler
$ make
$ make run

• Log Files
  • Refer to Memory Log

Producer-Consumer

$ cd Phase3
$ make
$ ./producer.out
$ ./concumer.out

Contributors

• Ahmed Magdy
• Mohamed Monsef
• Menna Mahmoud
• Nada Abdelmaboud