tomcat7自身调优和JVM调优

1. Tomcat优化其实就是对server.xml优化（开户线程池，调整http connector参数）

搜索【<Executor name="tomcatThreadPool"】，开启并调整为

<Executor name="tomcatThreadPool" namePrefix="catalina-exec-"

maxThreads="1000" maxIdleTime="60000"

minSpareThreads="20"/>

搜索【port="8080"】，调整为

<Connector executor="tomcatThreadPool" port="8080"//开启线程池

protocol="org.apache.coyote.http11.Http11AprProtocol"//开启Apr协议，需要安装Apr支持

maxHttpHeaderSize="8192" maxThreads="1000" processorCache="1000" acceptCount="1000"

minSpareThreads="100"

acceptorThreadCount="8" URIEncoding="UTF-8"

enableLookups="false" redirectPort="8443"//关闭反向查询

connectionTimeout="120000" keepAliveTimeout="120000"

maxKeepAliveRequests="65535" disableUploadTimeout="true"

compression="on" compressionMinSize="4096"//开启静态文件压缩

noCompressionUserAgents="gozilla, traviata"//开启静态文件压缩

compressableMimeType="text/html,text/xml,text/javascript,text/css,text/plain,application/json,application/x-javascript "//开启静态文件压缩

/>

2. 对catalina.sh优化JVM

打开 Tomcat路径/bin/ catalina.sh，在最顶部加入,红色部分请根据实际情况调整

JAVA_OPTS="-server -showversion-Xms12g -Xmx12g-XX:PermSize=256m -XX:MaxPermSize=256m"

JAVA_OPTS="$JAVA_OPTS -d64 -XX:CICompilerCount=8 -XX:+UseCompressedOops"

JAVA_OPTS="$JAVA_OPTS -XX:SurvivorRatio=4 -XX:TargetSurvivorRatio=90"

JAVA_OPTS="$JAVA_OPTS -XX:ReservedCodeCacheSize=256m -XX:-UseAdaptiveSizePolicy"

JAVA_OPTS="$JAVA_OPTS -Duser.timezone=Asia/Shanghai -XX:-DontCompileHugeMethods"

JAVA_OPTS="$JAVA_OPTS -Xss256k -XX:+AggressiveOpts -XX:+UseBiasedLocking"

JAVA_OPTS="$JAVA_OPTS -XX:MaxTenuringThreshold=31 -XX:+CMSParallelRemarkEnabled "

JAVA_OPTS="$JAVA_OPTS -XX:+UseCMSCompactAtFullCollection -XX:LargePageSizeInBytes=256m -XX:+UseFastAccessorMethods"

JAVA_OPTS="$JAVA_OPTS -XX:+UseCMSInitiatingOccupancyOnly -Djava.awt.headless=true"

JAVA_OPTS="$JAVA_OPTS -XX:+UseGCOverheadLimit -XX:AllocatePrefetchDistance=256 -XX:AllocatePrefetchStyle=1"

JAVA_OPTS="$JAVA_OPTS -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:MaxGCPauseMillis=200"

【注意】

1.-Xms=-Xmx=服务器内存*70%,如部署tomcat,jboss在同一台服务器-Xms=-Xmx=服务器内存*80%*1/4

2. 添加的参数建议要自己明白是什么意思，可以参考JVM参数列表