tomcat jvm优化设置

shuaiwei588

　　tomcat实例CATALINA_BASE/bin下的setenv.sh文件中设置
　　export CATALINA_OPTS="$CATALINA_OPTS -Xms1024m"
　　export CATALINA_OPTS="$CATALINA_OPTS -Xmx1024m"
　　export CATALINA_OPTS="$CATALINA_OPTS -Xmn128m"
　　export CATALINA_OPTS="$CATALINA_OPTS -XX:PermSize=128m"
　　export CATALINA_OPTS="$CATALINA_OPTS -XX:MaxPermSize=128m"
　　export CATALINA_OPTS="$CATALINA_OPTS -server"
　　export CATALINA_OPTS="$CATALINA_OPTS -Dfile.encoding=UTF8"
　　export CATALINA_OPTS="$CATALINA_OPTS -Djava.awt.headless=true"
　　echo "Using CATALINA_OPTS:$CATALINA_OPTS"
tomcat服务器端jvm优化设置
可以在对应tomcat实例CATALINA_BASE/bin下的setenv.sh文件中设置，如果没有该文件先创建该脚本文件
然后在其中设置jvm的优化参数。
http://doc.cloveretl.com/documentation/UserGuide/index.jsp?topic=/com.cloveretl.server.docs/docs/tomcat.html
如：

• 
  It is strongly recommended you change default limits for the heap and perm gen memory spaces.
  See section the section called “Memory Settings” for details.
  You can set the minimum and maximum memory heap size by adjusting the "Xms" and "Xmx" JVM parameters. You can set JVM parameters for Tomcat by setting the environment variable JAVA_OPTS in the [TOMCAT_HOME]/bin/setenv.sh file (if it does not exist, you may create it).
  Create setenv file:
  Unix-like systems: [tomcat]/bin/setenv.sh
  
  export CATALINA_OPTS="$CATALINA_OPTS -XX:MaxPermSize=512m -Xms128m -Xmx1024m"
  export CATALINA_OPTS="$CATALINA_OPTS -Dderby.system.home=$CATALINA_HOME/temp -server"
  echo "Using CATALINA_OPTS: $CATALINA_OPTS"
  
  Windows systems: [tomcat]/bin/setenv.bat
  
  set "CATALINA_OPTS=%CATALINA_OPTS% -XX:MaxPermSize=512m -Xms128m -Xmx1024m"
  set "CATALINA_OPTS=%CATALINA_OPTS% -Dderby.system.home=%CATALINA_HOME%/temp -server"
  echo "Using CATALINA_OPTS: %CATALINA_OPTS%"
  
   
  As visible in the settings above, there is also switch -server. For performance reasons, it is recommended to run the container in the "server" mode.
  
  

示例2：
https://gist.github.com/terrancesnyder/986029

#! /bin/sh

# ==================================================================

# ______ __ _____

# /_ __/___ ____ ___ _________ _/ /_ /__ /

# / / / __ \/ __ `__ \/ ___/ __ `/ __/ / /

# / / / /_/ / / / / / / /__/ /_/ / /_ / /

#/_/ \____/_/ /_/ /_/\___/\__,_/\__/ /_/

 

# Multi-instance Apache Tomcat installation with a focus

# on best-practices as defined by Apache, SpringSource, and MuleSoft

# and enterprise use with large-scale deployments.

 

# Credits:

# Google -> Couldn't survive without it

# Stackoverflow.com -> Community support

# SpringSource -> Specifically best-practices and seminars (Expert Series)

 

# Based On:

# http://www.springsource.com/files/uploads/tomcat/tomcatx-performance-tuning.pdf

# http://www.springsource.com/files/u1/PerformanceTuningApacheTomcat-Part2.pdf

# http://www.springsource.com/files/uploads/tomcat/tomcatx-large-scale-deployments.pdf

 

# Created By: Terrance A. Snyder

# URL: http://www.terranceasnyder.com, http://shutupandcode.net

 

# Best Practice Documentation:

# http://terranceasnyder.com/2011/05/tomcat-best-practices/

 

# Looking for the latest version?

# github @ https://github.com/terrancesnyder

 

# ==================================================================

 

# discourage address map swapping by setting Xms and Xmx to the same value

# http://confluence.atlassian.com/display/DOC/Garbage+Collector+Performance+Issues

export CATALINA_OPTS="$CATALINA_OPTS -Xms64m"


export CATALINA_OPTS="$CATALINA_OPTS -Xmx512m"


 

# Increase maximum perm size for web base applications to 4x the default amount

# http://wiki.apache.org/tomcat/FAQ/Memoryhttp://wiki.apache.org/tomcat/FAQ/Memory

export CATALINA_OPTS="$CATALINA_OPTS -XX:MaxPermSize=256m"


 

# Reset the default stack size for threads to a lower value (by 1/10th original)

# By default this can be anywhere between 512k -> 1024k depending on x32 or x64

# bit Java version.

# http://www.springsource.com/files/uploads/tomcat/tomcatx-large-scale-deployments.pdf

# http://www.oracle.com/technetwork/java/hotspotfaq-138619.html

export CATALINA_OPTS="$CATALINA_OPTS -Xss192k"


 

# Oracle Java as default, uses the serial garbage collector on the

# Full Tenured heap. The Young space is collected in parallel, but the

# Tenured is not. This means that at a time of load if a full collection

# event occurs, since the event is a 'stop-the-world' serial event then

# all application threads other than the garbage collector thread are

# taken off the CPU. This can have severe consequences if requests continue

# to accrue during these 'outage' periods. (specifically webservices, webapps)

# [Also enables adaptive sizing automatically]

export CATALINA_OPTS="$CATALINA_OPTS -XX:+UseParallelGC"


 

# This is interpreted as a hint to the garbage collector that pause times

# of <nnn> milliseconds or less are desired. The garbage collector will

# adjust the Java heap size and other garbage collection related parameters

# in an attempt to keep garbage collection pauses shorter than <nnn> milliseconds.

# http://java.sun.com/docs/hotspot/gc5.0/ergo5.html

export CATALINA_OPTS="$CATALINA_OPTS -XX:MaxGCPauseMillis=1500"


 

# A hint to the virtual machine that it.s desirable that not more than:

# 1 / (1 + GCTimeRation) of the application execution time be spent in

# the garbage collector.

# http://themindstorms.wordpress.com/2009/01/21/advanced-jvm-tuning-for-low-pause/

export CATALINA_OPTS="$CATALINA_OPTS -XX:GCTimeRatio=9"


 

# The hotspot server JVM has specific code-path optimizations

# which yield an approximate 10% gain over the client version.

export CATALINA_OPTS="$CATALINA_OPTS -server"


 

# Disable remote (distributed) garbage collection by Java clients

# and remove ability for applications to call explicit GC collection

export CATALINA_OPTS="$CATALINA_OPTS -XX:+DisableExplicitGC"


 

# Check for application specific parameters at startup

if [ -r "$CATALINA_BASE/bin/appenv.sh" ]; then


. "$CATALINA_BASE/bin/appenv.sh"


fi

 

echo "Using CATALINA_OPTS:"


for arg in $CATALINA_OPTS


do

echo ">> " $arg


done

echo ""


 

echo "Using JAVA_OPTS:"


for arg in $JAVA_OPTS


do

echo ">> " $arg


done

echo "_______________________________________________"


echo ""