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jquery教程http://www.software8.co/wzjs/jquery/

用NodeJS實現(xiàn)集群計算

Node的單個實例運行在單個的線程中，要充分利用多核系統(tǒng)，我們可以運行Node進(jìn)程集群來處理負(fù)載。

也就是說，如果系統(tǒng)有8核，單個Node實例只能使用其中1核，可以利用cluster包的workers概念來充分利用所有的核。有趣的是，它們可以共享同一個端口。

該模塊還處于實驗階段。

[javascript] view plain copy print ?

var cluster = require('cluster');
var http = require('http');
var numCPUs = require('os').cpus().length;
if (cluster.isMaster) {
// Fork workers.
require('os').cpus().forEach(function(){
cluster.fork();
});
// In case the worker dies!
cluster.on('exit', function(worker, code, signal) {
console.log('worker ' + worker.process.pid + ' died');
});
// As workers come up.
cluster.on('listening', function(worker, address) {
console.log("A worker with #"+worker.id+" is now connected to " +\
address.address +\
":" + address.port);
});
// When the master gets a msg from the worker increment the request count.
var reqCount = 0;
Object.keys(cluster.workers).forEach(function(id) {
cluster.workers[id].on('message',function(msg){
if(msg.info && msg.info == 'ReqServMaster'){
reqCount += 1;
}
});
});
// Track the number of request served.
setInterval(function() {
console.log("Number of request served = ",reqCount);
}, 1000);
} else {
// Workers can share the same port!
require('http').Server(function(req, res) {
res.writeHead(200);
res.end("Hello from Cluster!");
// Notify the master about the request.
process.send({ info : 'ReqServMaster' });
}).listen(8000);
}

在一個4核的計算機(jī)上，輸出如下：

[javascript] view plain copy print ?

Number of request served = 0
A worker with #2 is now connected to 0.0.0.0:8000
A worker with #4 is now connected to 0.0.0.0:8000
A worker with #1 is now connected to 0.0.0.0:8000
A worker with #3 is now connected to 0.0.0.0:8000
Number of request served = 0
...
Number of request served = 2
..
Number of request served = 4
...
Number of request served = 6

posted on 2012-10-10 10:50 你爸是李剛閱讀(275) 評論(0) 編輯收藏

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