Tomcat under the doctor stress test

Maximum number of threads open to 100 no problem

More than 101, there's a lot of connection failures.

Initial judgment is the problem of Tomcat's maximum connection number setting

Reset Tomcat Server.xml

After acceptcount=200, the maximum thread can open to 150 without any errors

ACCEPTCOUNT Specifies the number of requests placed in the queue

<connector connectiontimeout= "20000" port= "8080" protocol= "http/1.1" redirectport= "8443" acceptCount= "/>"

Java code

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 ("Thread array initialization takes%d milliseconds \ n", (System.currenttimemillis ()-starttime));





for (int i = 0; i < threads; i++) {


Workthreads[i].start ();


　 }





//system.out.printf ("Connection failed:%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 ("Small doctoral page code:% 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 ("There are%d unfinished threads, time consuming%d milliseconds \ n", Threads, (System.currenttimemillis ()-starttime));


if (threads = = 0) {


System.out.printf ("Total time consuming:%d milliseconds \ n", (System.currenttimemillis ()-starttime));


System.out.printf ("Connection failure:%d\n", error);


　　 }


　　 }


　 }





public void Readtobuffer (StringBuffer buffer,inputstream is)


throws IOException {


String Line; Used to hold content read per row


BufferedReader reader = new BufferedReader (


new InputStreamReader (IS));


line = Reader.readline (); Read the first line


while (line!= null) {//If line is empty description finished reading


Buffer.append (line); Add read content to buffer


buffer.append ("\ n"); Add a newline character


line = Reader.readline (); Read Next line


　　 }


　 }


　 }


}

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