tomcat下小博士压力测试

最大线程数开到100个没有问题
大于101个就有很多连接失败的
初步判断是tomcat的最大连接数设置的问题
重新设置tomcat server.xml
acceptCount=200后,最大线程可开到150 没有任何错误
acceptCount 指定放在队列里的请求数
<Connector connectionTimeout="20000" port="8080" protocol="HTTP/1.1" redirectPort="8443" acceptCount="200" />

package com.ask.pressure;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class AskPressure {
	private static String url = "http://192.168.0.59:8080/ask/index.html";
	private static Integer error = 0;
	private static Integer threads = 150;
	private static Long startTime;
	public static void main(String[] args) {
		
		WorkThread[] workThreads = new WorkThread[threads];
		for(int i = 0; i < threads; i++){
			workThreads[i] = new WorkThread();
		}
		
		startTime = System.currentTimeMillis();
		//System.out.printf("线程数组初始化耗时%d毫秒\n", (System.currentTimeMillis() - startTime));
		
		for(int i = 0; i < threads; i++){
			workThreads[i].start();
		}
		
		//System.out.printf("连接失败：%d", error);
	}

	private static class WorkThread extends Thread {
		public void run(){
			long start = System.currentTimeMillis();
			long end = 0;
			try {
				URL u = new URL(url);
				HttpURLConnection  urlConn = (HttpURLConnection)u.openConnection();
				urlConn.setUseCaches(false);
				urlConn.setRequestProperty("Content-type", "text/html; charset=UTF-8");
				urlConn.connect();
				//System.out.printf( "小博士页面编码: %s\n", urlConn.getContentEncoding());
				InputStream is = urlConn.getInputStream();
				StringBuffer buffer = new StringBuffer();
				readToBuffer(buffer, is);
				end = System.currentTimeMillis();
			} catch (Exception e) {
				synchronized(error){
					error ++;
				}
				e.printStackTrace();
			}
			
			synchronized(threads){
				threads --;
				System.out.printf("还有%d个未完线程, 耗时%d毫秒\n", threads, (System.currentTimeMillis() - startTime));
				if(threads == 0){
					System.out.printf("总耗时：%d毫秒\n", (System.currentTimeMillis() - startTime));
					System.out.printf("连接失败：%d\n", error);
				}
			}
		}

		public void readToBuffer(StringBuffer buffer, InputStream is)
				throws IOException {
			String line; // 用来保存每行读取的内容
			BufferedReader reader = new BufferedReader(
					new InputStreamReader(is));
			line = reader.readLine(); // 读取第一行
			while (line != null) { // 如果 line 为空说明读完了
				buffer.append(line); // 将读到的内容添加到 buffer 中
				buffer.append("\n"); // 添加换行符
				line = reader.readLine(); // 读取下一行
			}
		}
	}
}

还有9个未完线程, 耗时1484毫秒
还有5个未完线程, 耗时1547毫秒
还有6个未完线程, 耗时1516毫秒
还有7个未完线程, 耗时1516毫秒
还有8个未完线程, 耗时1484毫秒
还有4个未完线程, 耗时1547毫秒
还有3个未完线程, 耗时1547毫秒
还有2个未完线程, 耗时1563毫秒
还有1个未完线程, 耗时1578毫秒
总耗时：1578毫秒
连接失败：0
还有0个未完线程, 耗时1578毫秒
总耗时：1578毫秒
连接失败：0