与其他两个平台相比,node.js始终慢了一个数量级。
Java:
real 0m18.823s
user 0m2.735s
sys 0m6.042s
Python:
real 0m18.600s
user 0m2.656s
sys 0m5.857s
node.js:
real 3m19.034s
user 2m43.460s
sys 0m24.668s
有趣的是,在Python和Java中,客户端和服务器进程都使用约半个CPU。node.js的客户端使用了整个CPU,服务器使用了约30%的CPU。客户端进程也有大量页面错误,这让我认为这是一个内存问题。此外,当请求数达到10K时,node.js只慢了3倍; 它在长时间运行时肯定会变慢。下面是客户端代码(请注意,process.exit()行也不起作用,这就是为什么我除了使用time命令之外还包含一个内部计时器的原因):
var zeromq = require("zeromq");
var counter = 0;
var startTime = new Date();
var maxnum = 10000;
var socket = zeromq.createSocket('req');
socket.connect("tcp://127.0.0.1:5502");
console.log("Connected to port 5502.");
function moo()
{
process.nextTick(function(){
socket.send('Hello');
if (counter < maxnum)
{
moo();
}
});
}
moo();
socket.on('message',
function(data)
{
if (counter % 1000 == 0)
{
console.log(data.toString('utf8'), counter);
}
if (counter >= maxnum)
{
var endTime = new Date();
console.log("Time: ", startTime, endTime);
console.log("ms : ", endTime - startTime);
process.exit(0);
}
//console.log("Received: " + data);
counter += 1;
}
);
socket.on('error', function(error) {
console.log("Error: "+error);
});
服务器端代码:
var zeromq = require("zeromq");
var socket = zeromq.createSocket('rep');
socket.bind("tcp://127.0.0.1:5502",
function(err)
{
if (err) throw err;
console.log("Bound to port 5502.");
socket.on('message', function(envelope, blank, data)
{
socket.send(envelope.toString('utf8') + " Blancmange!");
});
socket.on('error', function(err) {
console.log("Error: "+err);
});
}
);
作比较的是 Python 客户端和服务器端的代码:
import zmq
context = zmq.Context()
socket = context.socket(zmq.REQ)
socket.connect("tcp://127.0.0.1:5502")
for counter in range(0, 100001):
socket.send("Hello")
message = socket.recv()
if counter % 1000 == 0:
print message, counter
import zmq
context = zmq.Context()
socket = context.socket(zmq.REP)
socket.bind("tcp://127.0.0.1:5502")
print "Bound to port 5502."
while True:
message = socket.recv()
socket.send(message + " Blancmange!")
这是Java客户端和服务器代码:
package com.moo.test;
import org.zeromq.ZMQ;
import org.zeromq.ZMQ.Context;
import org.zeromq.ZMQ.Socket;
public class TestClient
{
public static void main (String[] args)
{
Context context = ZMQ.context(1);
Socket requester = context.socket(ZMQ.REQ);
requester.connect("tcp://127.0.0.1:5502");
System.out.println("Connected to port 5502.");
for (int counter = 0; counter < 100001; counter++)
{
if (!requester.send("Hello".getBytes(), 0))
{
throw new RuntimeException("Error on send.");
}
byte[] reply = requester.recv(0);
if (reply == null)
{
throw new RuntimeException("Error on receive.");
}
if (counter % 1000 == 0)
{
String replyValue = new String(reply);
System.out.println((new String(reply)) + " " + counter);
}
}
requester.close();
context.term();
}
}
package com.moo.test;
import org.zeromq.ZMQ;
import org.zeromq.ZMQ.Context;
import org.zeromq.ZMQ.Socket;
public class TestServer
{
public static void main (String[] args) {
Context context = ZMQ.context(1);
Socket socket = context.socket(ZMQ.REP);
socket.bind("tcp://127.0.0.1:5502");
System.out.println("Bound to port 5502.");
while (!Thread.currentThread().isInterrupted())
{
byte[] request = socket.recv(0);
if (request == null)
{
throw new RuntimeException("Error on receive.");
}
if (!socket.send(" Blancmange!".getBytes(), 0))
{
throw new RuntimeException("Error on send.");
}
}
socket.close();
context.term();
}
}
我想喜欢 Node,但由于代码大小、简洁性和性能方面的巨大差异,目前我很难说服自己。
那么,有人之前见过这样的行为吗?还是我在代码中做了些愚蠢的事情?
zmq
模块是否有什么问题?我进行了一个简单的微基准测试,结果显示在简单的数字计算方面,Node.js比所有版本的Python都要快得多,与Java的速度相当。 - nicerobot