Introduction to OS

OS : What helps softwares run well in a hardware

 

CPU:

- ISA (Instruction Set Architecture)

• CISC vs RISC
• RISC had decreased number of instructions, it reduced the complexity, resulting in high speed and CPU Clock.

- Pipelining

• Fetch | Decode | Execute | Write Back
• Mainly used for enhancing performance by executing multiple instructions at once, which is called pipelining.

- Instruction Level Parallelism (ILP)

• Superscalla vs VLIW(Very Long Instruction Word)
• Simultaneous, Multi-Core Multithreading

Concurrent vs Parallel(Simultaneous)

Essential to understand the comparison between the two terms, though they can be used interchangeably at times.

The NUMA(Non-Uniform Multiprocessing Architecture)