Resin 3 pro高并发,响应性与稳定性方案

以下方案我是在Intel xeon(至强) 3.2G 2个双核物理CPU+2G内存(Ecc)上进行:

resin版本为resin-pro-3.0.21,JVM为Jrockit 1.5_06, resin java 启动参数 -Xms256m -Xmx512m

1. 以下为resin.conf配置
<!–

– Resin 3.0 configuration file.

–>

<resin xmlns=“http://caucho.com/ns/resin”
xmlns:resin=“http://caucho.com/ns/resin/core”>

<!–

– Logging configuration for the JDK logging API.

–>

<log name=“” level=“all” path=“stdout:” timestamp=“[%H:%M:%S.%s] “/>



<logger name=“com.caucho.java” level=“config”/>

<logger name=“com.caucho.loader” level=“config”/>



<dependency-check-interval>600s</dependency-check-interval>



<javac compiler=“internal” args=“”/>



<thread-pool>

<thread-max>10240</thread-max>

<spare-thread-min>50</spare-thread-min>

</thread-pool>



<min-free-memory>5M</min-free-memory>



<server>

<class-loader>

<tree-loader path=“${resin.home}/lib”/>

<tree-loader path=“${server.root}/lib”/>

</class-loader>



<keepalive-max>1024</keepalive-max>

<keepalive-timeout>60s</keepalive-timeout>



<resin:if test=“${resin.isProfessional()}”>

<select-manager enable=“true”/>

</resin:if>



<bind-ports-after-start/>



<http server-id=“” host=“*” port=“80”/>



<cluster>

<srun server-id=“” host=“127.0.0.1” port=“6802”/>

</cluster>



<resin:if test=“${resin.isProfessional()}”>

<persistent-store type=“cluster”>

<init path=“session”/>

</persistent-store>

</resin:if>



<ignore-client-disconnect>true</ignore-client-disconnect>



<resin:if test=“${isResinProfessional}”>

<cache path=“cache” memory-size=“20M”/>

</resin:if>



<web-app-default>

<class-loader>

<tree-loader path=“${server.root}/ext-webapp”/>

</class-loader>



<cache-mapping url-pattern=“/” expires=“60s”/>

<cache-mapping url-pattern=“*.gif” expires=“600s”/>

<cache-mapping url-pattern=“*.jpg” expires=“600s”/>



<servlet servlet-name=“directory”
servlet-class=“com.caucho.servlets.DirectoryServlet”>

<init enable=“false”/>

</servlet>



<allow-servlet-el/>



<session-config>

<enable-url-rewriting>false</enable-url-rewriting>

</session-config>



</web-app-default>



<host-default>

<class-loader>

<compiling-loader path=“webapps/WEB-INF/classes”/>

<library-loader path=“webapps/WEB-INF/lib”/>

</class-loader>



<!–access-log path=“logs/access.log”

format=‘%h %l %u %t “%r” %s %b “%{Referer}i” “%{User-Agent}i”‘
rollover-period=“1W”/–>



<web-app-deploy path=“webapps”/>



<ear-deploy path=“deploy”>

<ear-default>

<!– Configure this for the ejb server



– <ejb-server>

– <config-directory>WEB-INF</config-directory>

– <data-source>jdbc/test</data-source>

– </ejb-server>

–>

</ear-default>

</ear-deploy>



<resource-deploy path=“deploy”/>



<web-app-deploy path=“deploy”/>

</host-default>



<resin:import path=“${resin.home}/conf/app-default.xml”/>



<host-deploy path=“hosts”>

<host-default>

<resin:import path=“host.xml” optional=“true”/>

</host-default>

</host-deploy>



<host id=“” root-directory=“.”>

<web-app id=“/” document-directory=“d:\website\chat”>

</web-app>

</host>



</server>

</resin>





2. 在应用的web.xml中加入resin status查看servlet映射

      <servlet-mapping servlet-class=‘com.caucho.servlets.ResinStatusServlet’>

<url-pattern>/resin-status</url-pattern>

<init enable=“read”/>

</servlet-mapping>



3. 启动resin,确认应用正常启动。

4. 写访问测试程序

import java.io.InputStream;

import java.net.URL;


public class TestURL

{
public static void main(String[] args) throws Exception

{
long a = System.currentTimeMillis();

System.out.println(“Starting request url:”);

for(int i = 0; i < 10000; i++){
URL url = new URL(“http://192.168.1.200/main.jsp”);



InputStream is = url.openStream();

is.close();

System.out.println(“Starting request url:”+i);

}
System.out.println(“request url end.take “(System.currentTimeMillis()-a)“ms”);

}


}



5. 在Jbuilder中执行TestURL

在执行过程中,一边刷新http://192.168.1.200/resin-status,查看resin状态,在http://*:80 中的 Active Threads 和 Total,会一直增长,当长到512的时候不再增长,这时再刷新resin-status页面时,会发现打开很慢。原因是服务器已经达到最大连接数,在等待前面连接的释放而不能接受新的连接。

于是下载Resin 3.0.21源码,搜索 512,发现com.caucho.server.port.Port类中有以下代码:
// default timeout


private long _timeout = 65000L;



private int _connectionMax = 512;//就是这行,查找resin所有源码后,发现没有对这个值进行设置

private int _minSpareConnection = 16;



private int _keepaliveMax = -1;



private int _minSpareListen = 5;

private int _maxSpareListen = 10;


将_connectionMax 改为 20480,然后重新编译并替换resin.jar中的Port类。

6. 重新启动Resin,再次运行TestURL进行测试,这次你会发现Threads Active 和 Total 一直变大,且可以超过512一直增大,在测试程序运行过程中刷新页面,页面响应性能还是不错的.

另,测试过程中Resin会打印出 1-3次 强制执行GC的信息,属于正常。

7.待测试完毕,Threads Active 和 Total 马上降为1.Idle为9,总内存为536.87Meg 空闲内存为480.33M

再经多次测试,结果一致,内存回收正常,表明当前 resin 稳定性和响应性可靠。

出自 JAVA开发者(http://www.chinajavaworld.com)