What is Process?

 Any Program that is under execution is called a Process e.g. scanning an image is a process.

For the completion of a process resources are required. These resources are allocated to process either when process is created or is under execution. For Example you have typed a page in Microsoft Word and you want to print it, as you give print command the print process is created and it requires Printer as resource. If any other process is using the printer then your page will be queued and will be printed when first process of printing is complete. A process may have sub processes which are called child processes.A Process can demand only those resources which are available e.g. if 8 resources are available than process can demand all 8 resources but 9th resource can't be demanded.

Difference Between RISC and CISC

No.	RISC	CISC
1	It is an acronym for Reduced Instruction Set Computer. It is a type of microprocessor that has been designed to carry out few instructions at the same time.	CISC stands for Complex Instruction Set Computer. It is actually a CPU which is capable of executing many operations through a single instruction.
2	Faster than CISC	Slower than RISC chips when performing instructions
3	Pipelining can be implemented easily	Pipelining implementation is not easy
4	Direct addition is not possible	Direct addition between data in two memory locations. Ex.8085
5	Simple, single-cycle instructions that perform only basic Functions. Assembler instructions correspond to microcode instructions on CISC machine	A large and varied instruction set that includes simple, fast instructions for performing basic tasks, as well as complex, multi cycle Instructions that correspond to statements in an HLL.
6	RISC architecture is not widely used	At least 75% of the processor use CISC architecture
7	RISC chips require fewer transistors and cheaper to produce. Finally, it’s easier to write powerful optimized compilers	In common CISC chips are relatively slow (compared to RISC chips) per instruction, but use little (less than RISC) instructions.
8	RISC puts a greater burden on the software. Software developers need to write more lines for the same tasks	In CISC, software developers no need to write more lines for the same tasks