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May 23, 2011 00:07
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./setenv.sh - example setenv.sh with defaults set for minimal time spent in garbage collection
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#! /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 ">> " $arg | |
done | |
echo "_______________________________________________" | |
echo "" |
thank you so much
Thanks for sharing.
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It does not work for me
Creating setenv.sh with just export CATALINA_OPTS="$CATALINA_OPTS -Xmx512m" in it crashes tomcat7 on start.
$CATALINA_OPTS is not defined in my standard tomcat7 installation on Debian Jessie.
Should I define it somewhere ?
Regards