opensearch_jvm.options default values

jvm.options

## JVM configuration

################################################################
## IMPORTANT: JVM heap size
################################################################
##
## You should always set the min and max JVM heap
## size to the same value. For example, to set
## the heap to 4 GB, set:
##
## -Xms4g
## -Xmx4g
##
## See https://opensearch.org/docs/opensearch/install/important-settings/
## for more information
##
################################################################

# Xms represents the initial size of total heap space
# Xmx represents the maximum size of total heap space

-Xms1g
-Xmx1g

################################################################
## Expert settings
################################################################
##
## All settings below this section are considered
## expert settings. Don't tamper with them unless
## you understand what you are doing
##
################################################################

## GC configuration
8-10:-XX:+UseConcMarkSweepGC
8-10:-XX:CMSInitiatingOccupancyFraction=75
8-10:-XX:+UseCMSInitiatingOccupancyOnly

## G1GC Configuration
# NOTE: G1 GC is only supported on JDK version 10 or later
# to use G1GC, uncomment the next two lines and update the version on the
# following three lines to your version of the JDK
# 10:-XX:-UseConcMarkSweepGC
# 10:-XX:-UseCMSInitiatingOccupancyOnly
11-:-XX:+UseG1GC
11-:-XX:G1ReservePercent=25
11-:-XX:InitiatingHeapOccupancyPercent=30

## JVM temporary directory
-Djava.io.tmpdir=${OPENSEARCH_TMPDIR}

## heap dumps

# generate a heap dump when an allocation from the Java heap fails
# heap dumps are created in the working directory of the JVM
-XX:+HeapDumpOnOutOfMemoryError

# specify an alternative path for heap dumps; ensure the directory exists and
# has sufficient space
-XX:HeapDumpPath=data

# specify an alternative path for JVM fatal error logs
-XX:ErrorFile=logs/hs_err_pid%p.log

## JDK 8 GC logging
8:-XX:+PrintGCDetails
8:-XX:+PrintGCDateStamps
8:-XX:+PrintTenuringDistribution
8:-XX:+PrintGCApplicationStoppedTime
8:-Xloggc:logs/gc.log
8:-XX:+UseGCLogFileRotation
8:-XX:NumberOfGCLogFiles=32
8:-XX:GCLogFileSize=64m

# JDK 9+ GC logging
9-:-Xlog:gc*,gc+age=trace,safepoint:file=logs/gc.log:utctime,pid,tags:filecount=32,filesize=64m

# Explicitly allow security manager (https://bugs.openjdk.java.net/browse/JDK-8270380)
18-:-Djava.security.manager=allow

## OpenDistro Performance Analyzer
-Dclk.tck=100
-Djdk.attach.allowAttachSelf=true
-Djava.security.policy=/usr/share/opensearch/config/opensearch-performance-analyzer/opensearch_security.policy
--add-opens=jdk.attach/sun.tools.attach=ALL-UNNAMED