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Kumpulan 5 udd4o4ik9nn71, IMG_20190324_181208 DRIP2, IDENTIFY VARIOUS…
Kumpulan 5 
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Concept in OS
Multitasking
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The CPU switches from one program to the next so quickly that it appears as if all of the programs are executing at the same time.
Multiprogramming
When two or more programs are residing in memory at the same time, then sharing the processor is referred to the multiprogramming.
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Multiprogramming increases CPU utilization by organizing jobs so that the CPU always has one to execute.
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Spooling
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The disk is used as a very large buffer where complete jobs are queued on disk to be completed later.
Caching
Copying information into faster storage system; main memory can be viewed as a last cache for secondary storage.
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YB. Zainul owns 3k collection of Tudung Nelofa with 12k gold on each of it. He also owns aLouis Vuitton rice cooker and Gucci microwave. But toilet tissue pakai leaf.
Prof. Dr. Victor Turun has cure for Cancer, AIDS and world hunger. Currently working on a cure for AUTISM and DOWN SYNDROME.
Tuan Ehsan once stole a roti canai from a mouse and a chicken bits from a cat at Kedai Mamak. Nie abang ada Sigma grindset. Jngn main2.
I REJECT MY HUMANITY AND BE A SUPREME LEADER, JOJO!
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Me and The Based BOIS
Various OS Structure
MONOLITHIC
i. The earliest and the most common OS architecture
ii. All user program ran access components of kernel through system call (Syscall)
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Weakness
-Inflexible
-No hidden information
-Chaotic
-Difficult to understand
-To add any new service, the entire OS needs to be modified by the user.
Layered
i. Designed to overcome the issue of Monolithic Architacture
ii. Components were grouped according to their similarity of functions into layers
iii. Lower performance compare to Monolithic kernel
iv. Implementation of each layer can be modified without requiring any modification to other layers (called modular) :
Weakness
-More risk of breakdown
-issues related to higher/ lower layers
-Sluggish operation mode on application
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Microkernel
-Aimed at migrating services of OS into user level process
-Divide OS into several process
-Each implements a single set of services
-Developed to take out of the kernel as much as functionality as possible in order to :
i.Limit the code executed in privileged mode
ii. To allow easy modification and extentions
How microkernel work?
-Components above mikrokernel communicate directly with one another, although using message that pass through the microkernel itself.
-Microkernel validate message passes them between the components and grant access to hardware
Network and distributed
-Networked and distributed are being used in network operating system.
-A network operating system (NOS) is a specialized operating system for a network device such as a router, switch or firewall
-It enables process to access resources (e.g file) that reside on other independent computers on a network.
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You aren't supposed to discover this secret Easter Egg. THOU SHALL BE GONE, CHEATER!!!
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