web容器性能测试参数调整

1、优化操作系统网络访问性能，调整以下参数：

sysctl -w net.ipv4.tcp_tw_reuse=1

sysctl -w net.ipv4.tcp_tw_recycle=1

sysctl -w net.ipv4.tcp_fin_timeout=15

sysctl -w net.ipv4.tcp_keepalive_time=1800

sysctl -w net.core.wmem_max=16777216

sysctl -w net.core.rmem_max=16777216

sysctl -w net.ipv4.tcp_max_syn_backlog=8192

可通过sysctl -p查看配置是否生效

2、调整Linux系统的最大可打开文件数

echo -ne " 

* soft nofile 65535 

* hard nofile 65535 

" >>/etc/security/limits.conf

 调整为65536，即通过ulimit –n查看为65535

 3、修改tomcat/conf/server.xml中的maxThreads

 tomcat5.5

 <Connector port="8080" maxHttpHeaderSize="8192" maxThreads="500" minSpareThreads="25" maxSpareThreads="75" 

 enableLookups="false" redirectPort="8443" acceptCount="100" connectionTimeout="20000" disableUploadTimeout="true" 

 maxPostSize="10000"  allowTrace="false" />

tomcat6.0

<Connector port="8080" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8443" maxThreads="500" />

4、修改/tomcat/conf/web.xml的超时时间（默认为30min）

 <session-config>

        <session-timeout>10</session-timeout>

    </session-config>

5、修改tomcat/bin/catalina.sh

tomcat5.5

CATALINA_OPTS="$CATALINA_OPTS -server -Xmx2g  -Xms2g -Xmn512M -Xss256k  -XX:PermSize=64M -XX:MaxPermSize=128M -XX:+UseAdaptiveSizePolicy -XX:ParallelGCThreads=8 -XX:MaxTenuringThreshold=5 -XX:+UseParallelGC  -XX:MaxGCPauseMillis=200 -XX:+PrintClassHistogram  -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/home/george/tomcat/logs"

tomcat6.0的session相比tomct5.5的session要消耗内存，为和tomcat5.5有相同的测试场景，相比tomcat5.5需要调大Xmx和Xms的值

CATALINA_OPTS="$CATALINA_OPTS -server -Xmx5g  -Xms5g -Xmn2g -Xss256k  -XX:PermSize=512M -XX:MaxPermSize=512M -XX:+UseAdaptiveSizePolicy -XX:ParallelGCThreads=8 -XX:MaxTenuringThreshold=5 -XX:+UseParallelGC  -XX:MaxGCPauseMillis=200 -XX:+PrintClassHistogram  -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/home/george/tomcat/logs"