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Compsci #3

From 4.2

TermDefinition
Operating systems Oversee computer operations, store and retrieve files, provides the user interface, coordinate the execution of programs
OS examples Windows, Mac OS, Linux, etc
Smartphone OS examples Apple IOS, Windows Phone, Google Android, etc
Batch processing Job queue
Interactive processing Real time. Multimedia audio and video
Time-sharing One machine, many users
Multitasking One user, many tasks
Multiprocessor machines Load balancing
Embedded systems Specific devices
OS History Each program is called a "job". Early computers required significant setup time. Each "job" required its own setup. Operating Systems began as systems for simplifying set up and transitions between jobs
Jobs Program, data, and directions
Operating System architecture Application and System software
Application software Performs specific tasks for users
System software Provides structure for application software. Consists of operating system and utility software
ROM Read-only memory
Boot Loader In ROM. Run by the CPU when power is on. Transfers operating system from mass storage to main memory. Executes jump to operating system
Operating System components User interface and Kernel
User Interface Communicates with users. Intermediary between users and the kernel. Text based(Shell) or Graphical user interface(GUI)
Kernel Performs basic required functions (file manager, device drivers, memory manager, scheduler and dispatcher)
File manager Consists of directories or folders. Directory path - a sequence of directories within directories
Memory Manager Allocates space in main memory
Process Executing a program
Dispatcher Controls the allocation of time slices to the processes in the process table
Scheduler Adds new processes and removes completed processes from the process table
Process state Current status of the activity. Program counter, General purpose registers, Related portion of main memory
Sniffing software Allows users to monitor your internet traffic in real time, capturing all the data flowing to and from your computer
Auditing software Counters sniffing software. Streamlines the internal audit process
Created by: jolly_n4
Popular Computers sets

 

 



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