Tomcat的三种运行模式 [转]

Tomcat Connector的三种不同的运行模式性能相差很大，有人测试过的结果如下：

一、三种模式对比

NIO模式在Tomcat7必须修改Connector配置来启动：

<Connector port="8080" protocol="org.apache.coyote.http11.Http11NioProtocol" 
         connectionTimeout="20000" redirectPort="8443"/>

官方对这三种的区别的详细说明：

Java Blocking Connector   Java Nio Blocking Connector   APR/native Connector 
                             BIO                         NIO                       APR 
Classname                AjpProtocol               AjpNioProtocol           AjpAprProtocol 
Tomcat Version           3.x onwards                 7.x onwards              5.5.x onwards 
Support Polling              NO                          YES                       YES 
Polling Size                 N/A                   maxConnections             maxConnections 
Read Request Headers      Blocking                  Sim Blocking                   Blocking 
Read Request Body         Blocking                  Sim Blocking                   Blocking 
Write Response            Blocking                  Sim Blocking                   Blocking 
Wait for next Request     Blocking                  Non Blocking               Non Blocking 
Max Connections        maxConnections              maxConnections             maxConnections 

二、查看Tomcat 运行模式

一般我们通过log看到Connector使用的是哪一种运行模式：

    Starting ProtocolHandler ["http-bio-8080"]
    Starting ProtocolHandler ["http-nio-8080"]
    Starting ProtocolHandler ["http-apr-8080"]

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