Tomcat setenv script example

# ! /bin/sh
#multiple - 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

#Update By : Harun ar rashid
#URL : shamimsdiary.blogspot.com

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

# Looking for the latest version?
# github @ https://github.com/terrancesnyder

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

#export JAVA_HOME="/usr/java/jdk"

# 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="$CATALINA_OPTS -Xms4096m"
export CATALINA_OPTS="$CATALINA_OPTS -Xmx6144m"
# 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="$CATALINA_OPTS -XX:PermSize=256m"
export CATALINA_OPTS="$CATALINA_OPTS -XX:MaxPermSize=512m"


# 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
# Note - JDK 7 on RHEL needs minimum -Xss256k
#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 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 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"

# Uncomment to enable jconsole remote connection management.
# export CATALINA_OPTS="$CATALINA_OPTS -Dcom.sun.management.jmxremote
# -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.port=9011
# -Dcom.sun.management.jmxremote.local.only=false
# -Dcom.sun.management.jmxremote.authenticate=false"

# This was primarily set in catalina.sh
#JAVA_OPTS="$JAVA_OPTS -Xms4096M -Xmx4096M -XX:NewSize=256m -XX:MaxNewSize=512m
# -XX:MaxPermSize=512m -XX:+DisableExplicitGC
# -XX:+CMSClassUnloadingEnabled"

# 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 ""