resin3非专业版 超连接数后死锁无响应解决方案

Resin 3 pro高并发,响应性与稳定性方案(转)

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resin.conf的web-app-default元素下加入resin status查看servlet映射 (原文是加在了web.xml中，在resin3.1.10中服务启动失败)
  <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。

原文连接：http://www.blogjava.net/jelver/articles/183345.html