Wiki Article · Cinematic

Multitasking

Multitasking ek operating system capability hai jisme ek hi computer system par multiple tasks…

Overview

Multitasking — Quick Facts

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Property: Detail

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Full Name: Multitasking (Operating System)

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Also Known As: Time-sharing, Multi-programming,…

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Category: Operating System / System…

Topic 1

Infobox

📚 | Property | Detail | |---|---| | Full Name | Multitasking (Operating System) | | Also…

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Etymology aur History

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Pehle computers ek time par ek hi…

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Operator manually programs load…

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CPU idle rehta jab I/O operations…

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1961: MIT ka CTSS (Compatible…

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Kyun Zaroori Hai

🎯 Multitasking operating systems ka backbone hai — iske bina modern computing literally…

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Types of Multitasking

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Process apna kaam karta hai

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Jab process decide kare ke "abhi…

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OS next waiting process ko CPU…

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Agar process yield nahi kare — woh…

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How Multitasking Works

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Typical time quantum: 1 ms to 100…

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Linux CFS: dynamic time slices…

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Windows: typically 15-30 ms for…

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Chhota quantum (1-5 ms): Better…

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Context Switching — The Core Mechanism

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CPU registers (general purpose,…

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Program counter (kahan tak execute…

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Memory management info (page…

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I/O status information

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Process vs Thread Multitasking

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Har process ka apna address space…

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Processes isolated hain — ek crash…

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Inter-process communication (IPC)…

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Context switch expensive (page…

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CPU Scheduling Algorithms

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Non-preemptive (process tab tak…

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Simple to implement (FIFO queue)

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Convoy Effect: Ek long process…

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Poor average waiting time

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Preemptive vs Cooperative Comparison

📚 | Aspect | Preemptive Multitasking | Cooperative Multitasking | |---|---|---| | Control |…

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CPU Scheduling Flow (Diagram)

💡 `mermaid flowchart TD A[Process Created] --> B[New State] B --> C{Admitted to Ready…

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Scheduling Algorithms Comparison

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Multitasking in Modern Operating Systems

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Scheduler: CFS (Completely Fair…

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Process model: fork() + exec()…

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Thread support: NPTL (Native POSIX…

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Cgroups: Resource limits per…

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Real-World Analogies

🔑 Chef in Kitchen (Cooperative Multitasking) Ek chef kitchen me hai — ek dish ka onion chop…

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Challenges aur Limitations

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Modern CPU par 1 context switch ≈…

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Cache warming after switch ≈…

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1000 switches/second par indirect…

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L1 cache miss: ~4 cycles penalty

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Multitasking vs Related Concepts

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Multitasking: OS managing multiple…

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Concurrency: Multiple tasks making…

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Parallelism: Multiple tasks…

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Human Multitasking vs Computer Multitasking

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True rapid switching (nanosecond…

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Perfect state save/restore…

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CPU switch ke baad exact same…

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Scaling: thousands of tasks…

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Security Implications

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Spectre (2018): Speculative…

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Meltdown (2018): Kernel memory…

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Cache Timing Attacks: Cache…

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Buffer overflow: Process apne…

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Multitasking Performance Metrics

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vmstat 1 — Context switches, CPU…

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mpstat -P ALL 1 — Per-CPU…

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pidstat -w 1 — Per-process context…

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uptime — Load averages

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Future of Multitasking

🎯 Heterogeneous Computing Modern chips me different types ke cores hain (big.LITTLE, Intel…

Comparison

Process vs Thread Multitasking

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Address Space: Separate per process

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Isolation: Strong (crash protection)

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Context Switch Cost: High (page table…

Comparison

Preemptive vs Cooperative Comparison

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Control: OS forcefully controls CPU…

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Timer Interrupt: Required (hardware…

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Fairness: Guaranteed — time slicing

Comparison

Scheduling Algorithms Comparison

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FCFS: Non-preemptive

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SJF: Non-preemptive

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SRTF: Preemptive

Comparison

Multitasking vs Related Concepts

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Scope: OS-level (process management)

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Unit: Processes (independent programs)

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Memory: Separate address spaces

Diagram

Visual Flow

📊 Diagram visualization — details in narration

Quiz — Question 1

Multitasking ka sabse sahi definition kya hai?

Quick Quiz

Quiz — Question 2

Multitasking ka 'Full Name' kya hai?

Complete! 🎉

Multitasking Complete!

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Multitasking Complete

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