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Parallelism and features of an OS

Short answer

Parallelism is executing multiple operations at the same time, using multiple cores or time-sharing. Typical OS features include process and memory management, file and device management, security, user interface, resource accounting, error handling, networking, and deadlock handling.

What do you mean by parallelism? Write and explain the features of a typical operating system.

Parallelism

Parallelism is the ability of a system to carry out several operations or tasks at the same time. It is used to raise speed and throughput. Types:

  • Instruction-level: pipelining and superscalar execution overlap instructions inside one CPU.
  • Thread/process-level: multiple threads or processes run on multiple cores or processors.
  • Data-level: the same operation on many data items (SIMD, vector processing).
  • It may be real (more than one CPU) or pseudo (time-sharing on one CPU).

Features of a typical operating system

  1. Process management: creation, scheduling, termination, synchronisation and communication of processes; multitasking.
  2. Memory management: allocation, protection and virtual memory (paging/segmentation).
  3. File management: files and directories, access rights, storage allocation.
  4. Device management: device drivers, buffering and spooling for I/O devices.
  5. Security and protection: authentication and access control.
  6. User interface: command line or GUI.
  7. Resource management and accounting: fair use of CPU, memory and devices.
  8. Error handling: detection and recovery from errors.
  9. Networking support and interrupt and deadlock handling.

The OS uses parallelism features of the hardware, such as multiple cores, to run many processes together.

✓ Answer checked by Claude Opus 5.5 (high effort)

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