![V8 example
The JavaScript code to access property x from a Point object is:
point.x
In V8, the machine code generated for accessing x is:
# ebx = the point object
cmp [ebx,<hidden class offset>],<cached hidden class>
jne <inline cache miss>
mov eax,[ebx, <cached x offset>]](https://image.slidesharecdn.com/whynodejs-110618081221-phpapp01/85/Why-Node-js-35-320.jpg)
![Hello Tornado
import tornado.ioloop
import tornado.web
class MainHandler(tornado.web.RequestHandler):
def get(self):
self.write("Hello, world")
application = tornado.web.Application([
(r"/", MainHandler),
])
if __name__ == "__main__":
application.listen(8888)
tornado.ioloop.IOLoop.instance().start()](https://image.slidesharecdn.com/whynodejs-110618081221-phpapp01/85/Why-Node-js-48-320.jpg)
![Tornado with IO
import pymongo
import tornado.web
class Handler(tornado.web.RequestHandler):
@property
def db(self):
if not hasattr(self, '_db'):
# block here
self._db = pymongo.Connection(
host='127.0.0.1', port=27017).test
return self._db
def get(self):
try:
# block here
user = self.db.users.find_one({'username':
self.current_user})
self.render('template', full_name=user['full_name'])
except:
raise tornado.web.HTTPError(500)](https://image.slidesharecdn.com/whynodejs-110618081221-phpapp01/85/Why-Node-js-50-320.jpg)
![Tornado with async IO
import asyncmongo
import tornado.web
class Handler(tornado.web.RequestHandler):
@property
def db(self):
if not hasattr(self, '_db'):
self._db = asyncmongo.Client(pool_id='mydb',
host='127.0.0.1', port=27017,
maxcached=10, maxconnections=50, dbname='test')
return self._db
@tornado.web.asynchronous
def get(self):
self.db.users.find({'username': self.current_user}, limit=1,
callback=self._on_response)
def _on_response(self, response, error):
if error:
raise tornado.web.HTTPError(500)
self.render('template', full_name=respose['full_name'])](https://image.slidesharecdn.com/whynodejs-110618081221-phpapp01/85/Why-Node-js-51-320.jpg)
Why Node.js
- 1. Why by 桂林 桂糊涂@weibo guilin1981@twitter
- 2. About me 2003, Delphi. 2006, Java. 2009, Python. 2010, Node.js. Author of m on g osk in and st or m js
- 3. What is node.js? Evented I/O for V8 JavaScript.
- 4. What can node.js do?
- 5. What can node.js do? Node.js as webserver
- 6. What can node.js do? Node.js as webserver C10k problem
- 7. What can node.js do? Node.js as webserver C10k problem Comet
- 8. What can node.js do? Node.js as webserver C10k problem Comet Websocket
- 9. What can node.js do? Node.js as webserver C10k problem Comet Websocket Node.js as TCP server
- 10. What can node.js do? Node.js as webserver C10k problem Comet Websocket Node.js as TCP server Node.js as CLI tools
- 11. What can node.js do? Node.js as webserver C10k problem Comet Websocket Node.js as TCP server Node.js as CLI tools Node.js as GUI tools
- 12. Why node.js Wh y asy n c h r on ou s I O ?
- 13. Why asynchronous IO? IO is the bottle-neck of application.
- 14. Why asynchronous IO? IO is the bottle-neck of application. Network IO File IO Database IO
- 15. Blocking socket IO class ServerThread extends Thread { public ServerThread(socket){ this.socket = socket; } public void run(){ BufferedReader reader = new BufferedReader(this.socket.getInputStream()); String line; while((line = reader.readLine()) != null){ // block here // handle line } } } ... ServerSocket serverSocket = new ServerSocket(port); while (true) { Socket s = serverSocket.accept(); // block here new ServerThread(s).start(); }
- 16. Non-blocking socket IO net.createServer(function(socket){ socket.on('data', function(data){ // handle data }); socket.on('close', function(has_error){ // handle close }); socket.on('error', function(err){ // handle error }); }).listen(port);
- 17. Non-blocking IO vs Blocking IO nginx(non-blocking) vs apache(blocking)
- 19. Why node.js Why asynchronous IO? Wh y javasc r ip t ?
- 20. Why javascript?
- 21. Why javascript?
- 22. Why javascript?
- 23. Why javascript? Browsers war improving javascript.
- 24. Why javascript? Browsers war improving javascript. Javascript is one of the f ast est dynamic programming language.
- 25. Why javascript? Browsers war improving javascript. Javascript is one of the f ast est dynamic programming language. Javascript is one of the m ost p op u lar programming language.
- 26. Why javascript? Browsers war improving javascript. Javascript is one of the f ast est dynamic programming language. Javascript is one of the m ost p op u lar programming language. Javascript has c losu r e (anonymoused function).
- 27. Why javascript? Browsers war improving javascript. Javascript is one of the f ast est dynamic programming language. Javascript is one of the m ost p op u lar programming language. Javascript has c losu r e (anonymoused function). Javascript is cross-platform.
- 28. Why node.js Why asynchronous IO? Why javascript? Wh y v8 ?
- 29. About v8
- 30. About v8 V8 javascript VM is used in Goog le Ch r om e .
- 31. About v8 V8 javascript VM is used in Goog le Ch r om e . V8 team is led by L ar s B ak , one of the leading VM engineers in the world with 20 years of experience in building VM.
- 32. About v8 V8 javascript VM is used in Goog le Ch r om e . V8 team is led by L ar s B ak , one of the leading VM engineers in the world with 20 years of experience in building VM. L ar s B ak was the t ec h n ic al lead behind HotSpot(Sun’s Java VM). HotSpot improved Java’s performance 2 0 x t im es . Before HotSpot, L ar s B ak worked on a sm allt alk VM .
- 33. How fast v8 is? Fast Property Access Dynamic Machine Code Generation Efficient Garbage Collection
- 34. V8 example The JavaScript code to access property x from a Point object is: point.x
- 35. V8 example The JavaScript code to access property x from a Point object is: point.x In V8, the machine code generated for accessing x is: # ebx = the point object cmp [ebx,<hidden class offset>],<cached hidden class> jne <inline cache miss> mov eax,[ebx, <cached x offset>]
- 36. Why node.js Why asynchronous IO? Why javascript? Why v8? Wh y t h r ead less?
- 37. Why threadless?
- 38. Why threadless? 2mb stack per thread
- 39. Why threadless? 2mb stack per thread Dead-locking
- 40. Why threadless? 2mb stack per thread Dead-locking Thread-safe?
- 41. Why threadless? 2mb stack per thread Dead-locking Thread-safe? Thread is design for blocking IO.
- 42. Why node.js Why asynchronous IO? Why javascript? Why v8? Why threadless? Wh y n od e. js sp ec ial?
- 44. Why node.js special? Pythoner: Python is one of the most popular dynamic language too.
- 45. Why node.js special? Pythoner: Python is one of the most popular dynamic language too. Performance of python is OK.
- 46. Why node.js special? Pythoner: Python is one of the most popular dynamic language too. Performance of python is OK. We have good non-blocking web framework.
- 47. Tornado by facebook Tornado is a non-blocking web server, open-source by facebook.
- 48. Hello Tornado import tornado.ioloop import tornado.web class MainHandler(tornado.web.RequestHandler): def get(self): self.write("Hello, world") application = tornado.web.Application([ (r"/", MainHandler), ]) if __name__ == "__main__": application.listen(8888) tornado.ioloop.IOLoop.instance().start()
- 49. Hello Nodejs var http = require('http'); http.createServer(function (req, res) { res.writeHead(200, {'Content-Type': 'text/plain'}); res.end('Hello Node.jsn'); }).listen(3000, "127.0.0.1");
- 50. Tornado with IO import pymongo import tornado.web class Handler(tornado.web.RequestHandler): @property def db(self): if not hasattr(self, '_db'): # block here self._db = pymongo.Connection( host='127.0.0.1', port=27017).test return self._db def get(self): try: # block here user = self.db.users.find_one({'username': self.current_user}) self.render('template', full_name=user['full_name']) except: raise tornado.web.HTTPError(500)
- 51. Tornado with async IO import asyncmongo import tornado.web class Handler(tornado.web.RequestHandler): @property def db(self): if not hasattr(self, '_db'): self._db = asyncmongo.Client(pool_id='mydb', host='127.0.0.1', port=27017, maxcached=10, maxconnections=50, dbname='test') return self._db @tornado.web.asynchronous def get(self): self.db.users.find({'username': self.current_user}, limit=1, callback=self._on_response) def _on_response(self, response, error): if error: raise tornado.web.HTTPError(500) self.render('template', full_name=respose['full_name'])
- 52. Node.js with IO Anonymoused function, is very important for Evented IO var mongo = require('mongoskin'), http = require('http'), jade = require('jade'), db = mongo.db('localhost/test'); http.createServer(function (req, res) { res.writeHead(200, {'Content-Type': 'text/html'}); db.users.findOne({'username': req.session.current_user}, function(err, user){ jade.renderFile('template', {user: user}, function(err, html){ res.end(html); }); }); }).listen(3000, "127.0.0.1");
- 53. What make node.js special?
- 54. What make node.js special? Javascript is special.
- 55. What make node.js special? Javascript is special. Most of node.js modules are asynchronoused.
- 56. What make node.js special? Javascript is special. Most of node.js modules are asynchronoused. It’s easy to write threadless module.
- 57. What make node.js special? Javascript is special. Most of node.js modules are asynchronoused. It’s easy to write threadless module. Node.js community is very active.
- 58. How many modules? 2320 modules can be install via npm 2011, June 07.
- 59. Node.js community What do you think about node community?
- 60. Arunoda: Its the freedom followed by tools like github and npm. And everything is growing fast.
- 61. Pau: People is more open minded than in other programming communities. There is people coming from ruby, python, c, haskell, java, erlang, php…
- 62. Mikeal Rogers: People using node.js are building stuff. the project seeks to make the lives better of people building products.
- 63. Mikeal Rogers: People using node.js are building stuff. the project seeks to make the lives better of people building products. My experience with Python and Ruby is that their primary reason for working on the project is around with a new language and/or vm. the people who work on “core” don’t build products and probably never will.
- 64. Mikeal Rogers: People using node.js are building stuff. the project seeks to make the lives better of people building products. My experience with Python and Ruby is that their primary reason for working on the project is around with a new language and/or vm. the people who work on “core” don’t build products and probably never will. Node.js is not a language and it doesn’t write it’s own vm. it’s not attractive to people who don’t care about building stuff with it.
- 65. 桂林: 潮不等于装13
- 67. Why node.js
- 68. Why node.js Why asynchronous IO? Never blocking, cpu efficient Why javascript? Right and popluar language Why v8? Extremely fast VM Why threadless? Easy, memory efficient Why node.js special? Active and creative community
- 69. Thank you