该优化针对Linux X86_X64环境
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in 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