toamcat 配置记录 setenv

server.xml 配置（注意版本）

https://tomcat.apache.org/tomcat-9.0-doc/config/http.html

setenv.bat

rem set "JAVA_OPTS=%JAVA_OPTS% -Xms8G -Xmx8G -XX:PermSize=512M -XX:MaxNewSize=512M -XX:MaxPermSize=512M -server -Dfile.encoding=UTF-8"

rem ==================================================================
rem discourage address map swapping by setting Xms and Xmx to the same value
rem http://confluence.atlassian.com/display/DOC/Garbage+Collector+Performance+Issues
set "JAVA_OPTS=%JAVA_OPTS% -Xms10g"
set "JAVA_OPTS=%JAVA_OPTS% -Xmx10g"

rem Increase maximum perm size for web base applications to 4x the default amount
rem http://wiki.apache.org/tomcat/FAQ/Memoryhttp://wiki.apache.org/tomcat/FAQ/Memory
set "JAVA_OPTS=%JAVA_OPTS% -XX:MaxMetaspaceSize=1g"

rem Reset the default stack size for threads to a lower value (by 1/10th original)
rem By default this can be anywhere between 512k -> 1024k depending on x32 or x64
rem bit Java version.
rem http://www.springsource.com/files/uploads/tomcat/tomcatx-large-scale-deployments.pdf
rem http://www.oracle.com/technetwork/java/hotspotfaq-138619.html
set "JAVA_OPTS=%JAVA_OPTS% -Xss228k"

rem Oracle Java as default, uses the serial garbage collector on the
rem Full Tenured heap. The Young space is collected in parallel, but the
rem Tenured is not. This means that at a time of load if a full collection
rem event occurs, since the event is a 'stop-the-world' serial event then
rem all application threads other than the garbage collector thread are
rem taken off the CPU. This can have severe consequences if requests continue
rem to accrue during these 'outage' periods. (specifically webservices, webapps)
rem [Also enables adaptive sizing automatically]
set "JAVA_OPTS=%JAVA_OPTS% -XX:+UseParallelGC"

rem This is interpreted as a hint to the garbage collector that pause times
rem of <nnn> milliseconds or less are desired. The garbage collector will
rem adjust the  Java heap size and other garbage collection related parameters
rem in an attempt to keep garbage collection pauses shorter than <nnn> milliseconds.
rem http://java.sun.com/docs/hotspot/gc5.0/ergo5.html
set "JAVA_OPTS=%JAVA_OPTS% -XX:MaxGCPauseMillis=1500"

rem A hint to the virtual machine that it.s desirable that not more than:
rem 1 / (1 + GCTimeRation) of the application execution time be spent in
rem the garbage collector.
rem http://themindstorms.wordpress.com/2009/01/21/advanced-jvm-tuning-for-low-pause/
set "JAVA_OPTS=%JAVA_OPTS% -XX:GCTimeRatio=9 -XX:+UseAdaptiveSizePolicy"

rem file encoding
set "JAVA_OPTS=%JAVA_OPTS% -Dfile.encoding=UTF-8"

rem The hotspot server JVM has specific code-path optimizations
rem which yield an approximate 10% gain over the client version.
set "JAVA_OPTS=%JAVA_OPTS% -server"

rem Disable remote (distributed) garbage collection by Java clients
rem and remove ability for applications to call explicit GC collection
set "JAVA_OPTS=%JAVA_OPTS% -XX:+DisableExplicitGC"

rem out of memory dump
set "JAVA_OPTS=%JAVA_OPTS% -XX:+HeapDumpOnOutOfMemoryError"
set "JAVA_OPTS=%JAVA_OPTS% -XX:HeapDumpPath=%CATALINA_BASE%\heapdump\ppm.hprof"

setenv.sh

#! /bin/sh
# ==================================================================
# 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="$CATALINA_OPTS -Xms4g"
export CATALINA_OPTS="$CATALINA_OPTS -Xmx4g"

# 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:MaxMetaspaceSize=1g"

# 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 -Xss228k"

# 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 -XX:+UseAdaptiveSizePolicy"

# 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"

#out of memory dump
export CATALINA_OPTS="$CATALINA_OPTS -XX:+HeapDumpOnOutOfMemoryError"
export CATALINA_OPTS="$CATALINA_OPTS -XX:HeapDumpPath=/root/heapdump/ppm.hprof"

# 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 ""