Tomcat 调优
一、提高JVM栈内存
/tomcat/bin/setenv.sh
JAVA_OPTS="-Djava.awt.headless=true -Dfile.encoding=UTF-8
-server -Xms1024m -Xmx1024m xms与xmx为物理内存的1/4
-XX:NewSize=512m -XX:MaxNewSize=512m -XX:PermSize=512m
-XX:MaxPermSize=512m -XX:+DisableExplicitGC"
-Xms – 指定初始化最小堆内存
-Xmx – 指定初始化最大堆内存
二、JRE内存泄漏
/tomcat/conf/server.xml
三、线程池
maxThreads="250" maxHttpHeaderSize="8192"
minSpareThreads="50" maxSpareThreads="200"
acceptCount="300"
emptySessionPath="true" protocol="HTTP/1.1"
enableLookups="false" redirectPort="8181" acceptCount="100"
connectionTimeout="20000" disableUploadTimeout="true" />
org.apache.tomcat.util.threads.ThreadPool logFull SEVERE: All threads (250) are currently busy, waiting. Increase maxThreads (250) or check the servlet status
如果应用提示上述错误，务必检查上述错误是否是由于单个请求花费太长时间造成的，这个问题的原因是这样的，有时候如果数据库连接不释放的话，进程将不会处理其它请求。
四、压缩
connectionTimeout="20000"
redirectPort="8181" compression="500"
compressableMimeType="text/html,text/xml,text/plain,application/octet-stream" />
五、数据库调优
六、tomcat原生库
tomcat启用gzip压缩
/tomcat/conf/server.xml
connectionTimeout="20000"
redirectPort="8443" executor="tomcatThreadPool" URIEncoding="utf-8"
compression="on"
compressionMinSize="50" noCompressionUserAgents="gozilla, traviata"
compressableMimeType="text/html,text/xml,text/javascript,text/css,text/plain" />