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这篇文章将为大家详细讲解有关Netty NIO框架性能压测之如何实现长链接,小编觉得挺实用的,因此分享给大家做个参考,希望大家阅读完这篇文章后可以有所收获。
需要将ulimit -n 改大,否则nio链接开不大。
准备4台机器(1台netty服务器,3台压测机)
使用apache的ab做压测工具
压测代码:
package org.dueam.sample.netty; package org.dueam.sample.netty; import java.io.BufferedReader; import java.io.InputStreamReader; import java.net.InetSocketAddress; import java.util.HashMap; import java.util.Map; import java.util.Random; import java.util.concurrent.Executors; import org.jboss.netty.bootstrap.ServerBootstrap; import org.jboss.netty.buffer.ChannelBuffer; import org.jboss.netty.buffer.DynamicChannelBuffer; import org.jboss.netty.channel.Channel; import org.jboss.netty.channel.ChannelFactory; import org.jboss.netty.channel.ChannelHandlerContext; import org.jboss.netty.channel.ChannelPipeline; import org.jboss.netty.channel.ChannelStateEvent; import org.jboss.netty.channel.ExceptionEvent; import org.jboss.netty.channel.MessageEvent; import org.jboss.netty.channel.SimpleChannelHandler; import org.jboss.netty.channel.ChannelHandler.Sharable; import org.jboss.netty.channel.socket.nio.NioServerSocketChannelFactory; public class ChatServer { public static void main(String[] args) throws Exception { if(args.length <1){ args = new String[]{"9876","true"}; } ChannelFactory factory = new NioServerSocketChannelFactory(Executors .newCachedThreadPool(), Executors.newCachedThreadPool()); ServerBootstrap bootstrap = new ServerBootstrap(factory); ChatServerHandler handler = new ChatServerHandler(); ChannelPipeline pipeline = bootstrap.getPipeline(); pipeline.addLast("chat", handler); bootstrap.setOption("child.tcpNoDelay", true); bootstrap.setOption("child.keepAlive", true); int port = Integer.valueOf(args[0]); bootstrap.bind(new InetSocketAddress(port)); boolean fillChat = "true".equals(args[1]); if (fillChat) { ChannelManagerThread cmt = new ChannelManagerThread(); cmt.start(); } BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); while (true) { String command = br.readLine(); if ("dump".equals(command)) { System.out.println("当前活着的数量:" + channel.size()); } else if ("help".equals(command)) { System.out.println("命令列表:"); System.out.println("dump:打印当前情况"); System.out.println("help:帮助文档"); } } } final static Random random = new Random(); static int max = 0; static class ChannelManagerThread extends Thread { @Override public void run() { while (true) { try { if(max < channel.size()){ max = channel.size() ; System.out.println("live:"+channel.size()); } for (Channel s : channel.values()) { if (random.nextInt(100)>70) { ChannelBuffer cb = new DynamicChannelBuffer(256); cb.writeBytes("Hey!有人来找你了!".getBytes()); s.write(cb); } } sleep(500); } catch (InterruptedException e) { } } } } final static Map<Integer, Channel> channel = new HashMap<Integer, Channel>(); static void log(String message) { System.out.println(message); } @Sharable static class ChatServerHandler extends SimpleChannelHandler { @Override public void channelConnected(ChannelHandlerContext ctx, ChannelStateEvent e) { Channel ch = e.getChannel(); ChannelBuffer cb = new DynamicChannelBuffer(256); cb.writeBytes("Hell!你来了啊!".getBytes()); ch.write(cb); channel.put(e.getChannel().getId(), e.getChannel()); } @Override public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) { } @Override public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) { e.getCause().printStackTrace(); channel.remove(e.getChannel().getId()); log("remove channel by exception! id:" + e.getChannel().getId()); e.getChannel().close(); } @Override public void channelDisconnected(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception { channel.remove(e.getChannel().getId()); log("remove channel by exception! id:" + e.getChannel().getId()); } } }
压测方式:
#加大超时和并发量,并使用keep-alive的方式保持住端口 ./ab -n 20000 -c 20000 -k -t 999999999 -r http://192.168.216.30:9876/
内存损耗:
[root@cap216030 ~]# free -k -t -s 10 -- 原始内存 total used free shared buffers cached Mem: 4149076 189828 3959248 0 13196 95484 -/+ buffers/cache: 81148 4067928 Swap: 2096472 208 2096264 Total: 6245548 190036 6055512 -- 执行 chat server之后 total used free shared buffers cached Mem: 4149076 207236 3941840 0 13216 96244 -/+ buffers/cache: 97776 4051300 Swap: 2096472 208 2096264 Total: 6245548 207444 6038104 -- 59471 个nio连接之后 total used free shared buffers cached Mem: 4149076 474244 3674832 0 13328 96132 -/+ buffers/cache: 364784 3784292 Swap: 2096472 208 2096264 Total: 6245548 474452 5771096
结论:
Netty nio 可以轻松将链接开到6W,每个线程大概损坏5k左右的系统内存
编写Java客户端做内容实时双向推送
使用100台机器每台机器起1000个线程来模拟客户端进行压测
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