computers such as minicomputers and mobiles/smart phones, which can be
carried in a pocket and are able to do most of jobs humans need in day-to-day
life.
While a computer may be regarded as executing one gigantic program stored
in its main memory, in some computers, it is necessary to have the capacity
of executing several programs concurrently. This is achieved through
multitasking; that is, the computer is enabled to switch rapidly between
multiple executing programs to show them running simultaneously.
Next-generation computers are designed to distribute their process across
numerous CPUs in a multiprocessing configuration. This technique was
earlier available in huge and commanding computers, such as
supercomputers, servers, and mainframe computers. Nowadays, such
multiprocessor and multicore capabilities are extensively available on
personal computers and laptops.
Although such high-speed computers are demonstrating delightful processing
abilities, the next serious invention that transformed the world of processing
was high-speed computer networking. This technique permitted an enormous
number of computers to interact and established the next level of processing.
The incredible fact about networked computers is that they can be placed
geographically either within the same location connected as Local Area
Network (LAN) or be situated across continents and connected as Wide
Area Network (WAN).
Today, a new computer/smartphone is definitely expected to have
multiprocessor/multicore capacity at an affordably low cost. Besides, the
trend has changed from CPU to Graphics Processing Unit (GPU),
also called as Visual Processing Unit (VPU), which can be installed in
personal computers, mobile phones, workstations, embedded systems, and
gaming consoles. Recent GPUs are very capable of computer graphics
manipulation and image processing, and they are more efficient than general-
purpose CPUs due to their highly parallel assembly.
The following diagram represents the evolution of computing models from
mainframe to cloud, how each concern like availability SLA, Scaling,
Hardware, HA Type, Software and Consumption are varied over the time
