Operating system 1 (Edexcel GCSE Computer Science): Flashcards
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What is an operating system?
What is an operating system?
Program that acts as interface between hardware and software
Four main tasks of an OS
Four main tasks of an OS
Process, file, user, peripheral management
Process management task
Process management task
Tracking running programs, giving each CPU time & memory
File management task
File management task
Organizing file system, controlling permissions & storage
User management task
User management task
Creating user accounts, managing access & providing interface
Peripheral management task
Peripheral management task
Communicating with devices using device drivers
Device drivers
Device drivers
Special programs to control each device
Process in computing
Process in computing
Program loaded in memory
Multitasking
Multitasking
Running several processes at the same time
Scheduling algorithm purpose
Scheduling algorithm purpose
Rapidly switches between processes, giving each one CPU time
Pages in memory management
Pages in memory management
Chunks that OS organizes memory into
Virtual memory
Virtual memory
Hard drive area for storing inactive processes temporarily
Round-robin scheduling
Round-robin scheduling
Each process gets time slice, then goes to back of queue
Time slice
Time slice
Fixed amount of time allocated to each process
Queue in round-robin
Queue in round-robin
Line where processes wait for their turn