查看tomcat当前并发数
如何在WINDOW下配置TOMCAT APR：APR是什么呢，（Tomcat can use the Apache Portable Runtime to provide superiorscalability, performance, and better integration with native server technologies. ）
Windows下的安装配置与使用
1、先去 http://tomcat.heanet.ie/native/ 下载编译好的 tcnative-1.dll 文件
2、把tcnative-1.dll文件放在Tomcat的bin目录下
然后启动TOMCAT，如果看到以下信息：
2008-8-31 17:28:59 org.apache.coyote.http11.Http11AprProtocol start
信息: Starting Coyote HTTP/1.1 on http-8080
2008-8-31 17:28:59 org.apache.coyote.ajp.AjpAprProtocol start］则配置成功
然后你可以用APACHE的AB命令测试下效果.
ab -n 1000 -c 300 http://localhost:8080/turbine/index.jsp
相关APR的参数配置可以参考以下文档:
http://tomcat.apache.org/tomcat-5.5-doc/apr.html
如何查看TOMCAT的并发访问量：
我们进入TOMCAT服务管理页面（http://localhost:8080/manager/status）,可以看到下面这段文字
http-8080
Max threads: 1000 Min spare threads: 0 Max spare threads: 0 Current thread count: 303 Current thread busy: 234 Keeped alive sockets count: 0
Max processing time: 23531 ms Processing time: 29287.717 s Request count: 2980 Error count: 0 Bytes received: 0.00 MB Bytes sent: 12.61 MB
Current thread count: 303这个参数则代表当前TOMCAT的并发访问量
这是我TOMCAT服务器的配置:
<Connector port="8080" maxHttpHeaderSize="8192" pollerSize="10025"
maxThreads="1000" minSpareThreads="25" maxSpareThreads="75"
enableLookups="false" redirectPort="8443" acceptCount="100"
compression="on" compressionMinSize="2048"
compressableMimeType="text/html,text/xml,text/javascript,text/css,text/plain"
connectionTimeout="20000" disableUploadTimeout="true" sendfileSize="2048" />
将TOMCAT日志更改为LOG4J日志输出
把commons-logging.jar,log4j-1.2.13.jar的两个JAR拷贝到tomcat_home/common/lib下面.
然后在将log4j.properties拷贝到tomcat_home/common/classes下面
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