Parallel Programming in Web Browsers:
1. Basic Concept of Parallel Programming:
- Performing multiple tasks simultaneously.
- Example: Instead of one person doing a single task, many people work together to complete multiple tasks at the same time.
2. Example of Parallel Programming in the Browser:
const worker1 = new Worker('worker1.js');
const worker2 = new Worker('worker2.js');
// One worker is processing an image
worker1.postMessage({task: 'processImage'});
// Another worker is calculating data
worker2.postMessage({task: 'calculateData'});
3. Benefits:
- Prevents browser from hanging.
- Ensures the website runs smoothly.
- Tasks complete faster.
4. Real-Life Example: Similar to tasks in a kitchen:
- One person is chopping vegetables.
- Another person is cleaning fish.
- Another is washing rice.
- All tasks are happening simultaneously.
5. When Needed in Browsers:
- Large file uploads/downloads.
- Video editing.
- Games.
- Heavy calculations.
6. Core Components:
- Web Workers (separate threads).
- SharedArrayBuffer (memory sharing).
- MessageChannel (communication).
7. Limitations:
- Cannot manipulate the DOM.
- Cannot directly share variables with the main thread.
- Uses additional memory.
Thus, parallel programming makes browsers faster and more efficient, especially for heavy computations or large data processing tasks.