Node.js
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Node.js is a platform built on Chrome's JavaScript runtime for easily building fast, scalable network applications. Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient, perfect for data-intensive real-time applications that run across distributed devices.
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Node.js
- 2. Presented By, NEETHU D Presented On, 20/01/2014
- 4. created by Ryan Dahl starting in 2009 Story behind it Original goal was to create a website with push capabali- ties like gmail. V8( java script engine)
- 5. A JavaScript runtime environment running Google Chrome’s V8 engine a server-side solution for JS Compiles JS, making it really fast Runs over the command line Designed for high concurrency Without threads or new processes Never blocks, not even for I/O Uses the Common JS framework Making it a little closer to a real OO language
- 6. Node.js is currently used by a number of large companies including LinkedIn, Microsoft, Yahoo!, Walmart and Paypal.
- 7. Cloud9 IDE (cloud service) JetBrains WebStorm or Intelli IDEA(commercial products) Microsoft WebMatrix(free) or Visual Studio (commercial product) with Node.js Tools for Visual Studio (free) Nodeclipse(Eclipse-based)
- 8. CONCURRENCY: THE EVENT LOOP Instead of threads Node uses an event loop with a stack Alleviates overhead of context switching
- 9. EVENT LOOP EXAMPLE Request for “index.html” comes in Stack unwinds and ev_loop goes to sleep File loads from disk and is sent to the client
- 10. NON-BLOCKING I/O Servers do nothing but I/O Scripts waiting on I/O requests degrades performance To avoid blocking, Node makes use of the event driven nature of JS by attaching callbacks to I/O requests Scripts waiting on I/O waste no space because they get popped off the stack when their non- I/O related code finishes executing
- 11. I/O EXAMPLE
- 12. DRAWBACKS Use of JS on both the client and server-side should remove need to “context switch” Client-side JS makes no access to files/databases Server-side JS deals mostly in files/databases JSDom project for Node works for simple tasks, but not much else
- 13. It lets a developer to create a server with few lines of code.. It is 90% faster than php – awesome way of computing..
- 14. Performance is the main advantage .. Allocates small heap… thread creation and heap allocation
- 15. CONCLUSION Still in beta Node.js shines in real time web applications employing push technologies Non-blocking nature takes some getting used to Interesting API It is still on developing stage
- 16. REFERENCES http://nodejs.org/ http://nodejs.org/cinco_de_node.pdf http://ajaxian.com/archives/google-chrome- chromium-and-v8 http://blog.chromium.org/2010/12/new- crankshaft-for-v8.html http://news.softpedia.com/news/IE9-RC-vs- Chrome-10-9-vs-Opera-11-vs-Firefox-11- Performance-Comparison-183973.shtml