104 lines
4.1 KiB
Plaintext
104 lines
4.1 KiB
Plaintext
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###########################################################################
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# jvm11-server.options #
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# #
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# See jvm-server.options. This file is specific for Java 11 and newer. #
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###########################################################################
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#################
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# GC SETTINGS #
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#################
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### CMS Settings
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-XX:+UseConcMarkSweepGC
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-XX:+CMSParallelRemarkEnabled
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-XX:SurvivorRatio=8
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-XX:MaxTenuringThreshold=1
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-XX:CMSInitiatingOccupancyFraction=75
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-XX:+UseCMSInitiatingOccupancyOnly
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-XX:CMSWaitDuration=10000
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-XX:+CMSParallelInitialMarkEnabled
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-XX:+CMSEdenChunksRecordAlways
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## some JVMs will fill up their heap when accessed via JMX, see CASSANDRA-6541
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-XX:+CMSClassUnloadingEnabled
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### G1 Settings
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## Use the Hotspot garbage-first collector.
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#-XX:+UseG1GC
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#-XX:+ParallelRefProcEnabled
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#
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## Have the JVM do less remembered set work during STW, instead
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## preferring concurrent GC. Reduces p99.9 latency.
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#-XX:G1RSetUpdatingPauseTimePercent=5
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#
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## Main G1GC tunable: lowering the pause target will lower throughput and vise versa.
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## 200ms is the JVM default and lowest viable setting
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## 1000ms increases throughput. Keep it smaller than the timeouts in cassandra.yaml.
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#-XX:MaxGCPauseMillis=500
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## Optional G1 Settings
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# Save CPU time on large (>= 16GB) heaps by delaying region scanning
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# until the heap is 70% full. The default in Hotspot 8u40 is 40%.
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#-XX:InitiatingHeapOccupancyPercent=70
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# For systems with > 8 cores, the default ParallelGCThreads is 5/8 the number of logical cores.
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# Otherwise equal to the number of cores when 8 or less.
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# Machines with > 10 cores should try setting these to <= full cores.
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#-XX:ParallelGCThreads=16
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# By default, ConcGCThreads is 1/4 of ParallelGCThreads.
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# Setting both to the same value can reduce STW durations.
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#-XX:ConcGCThreads=16
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### JPMS
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-Djdk.attach.allowAttachSelf=true
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--add-exports java.base/jdk.internal.misc=ALL-UNNAMED
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--add-exports java.base/jdk.internal.ref=ALL-UNNAMED
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--add-exports java.base/sun.nio.ch=ALL-UNNAMED
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--add-exports java.management.rmi/com.sun.jmx.remote.internal.rmi=ALL-UNNAMED
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--add-exports java.rmi/sun.rmi.registry=ALL-UNNAMED
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--add-exports java.rmi/sun.rmi.server=ALL-UNNAMED
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--add-exports java.sql/java.sql=ALL-UNNAMED
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--add-opens java.base/java.lang.module=ALL-UNNAMED
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--add-opens java.base/jdk.internal.loader=ALL-UNNAMED
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--add-opens java.base/jdk.internal.ref=ALL-UNNAMED
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--add-opens java.base/jdk.internal.reflect=ALL-UNNAMED
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--add-opens java.base/jdk.internal.math=ALL-UNNAMED
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--add-opens java.base/jdk.internal.module=ALL-UNNAMED
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--add-opens java.base/jdk.internal.util.jar=ALL-UNNAMED
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--add-opens jdk.management/com.sun.management.internal=ALL-UNNAMED
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### GC logging options -- uncomment to enable
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# Java 11 (and newer) GC logging options:
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# See description of https://bugs.openjdk.java.net/browse/JDK-8046148 for details about the syntax
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# The following is the equivalent to -XX:+PrintGCDetails -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=10 -XX:GCLogFileSize=10M
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#-Xlog:gc=info,heap*=trace,age*=debug,safepoint=info,promotion*=trace:file=/var/log/cassandra/gc.log:time,uptime,pid,tid,level:filecount=10,filesize=10485760
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# Notes for Java 8 migration:
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#
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# -XX:+PrintGCDetails maps to -Xlog:gc*:... - i.e. add a '*' after "gc"
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# -XX:+PrintGCDateStamps maps to decorator 'time'
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#
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# -XX:+PrintHeapAtGC maps to 'heap' with level 'trace'
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# -XX:+PrintTenuringDistribution maps to 'age' with level 'debug'
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# -XX:+PrintGCApplicationStoppedTime maps to 'safepoint' with level 'info'
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# -XX:+PrintPromotionFailure maps to 'promotion' with level 'trace'
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# -XX:PrintFLSStatistics=1 maps to 'freelist' with level 'trace'
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### Netty Options
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# On Java >= 9 Netty requires the io.netty.tryReflectionSetAccessible system property to be set to true to enable
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# creation of direct buffers using Unsafe. Without it, this falls back to ByteBuffer.allocateDirect which has
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# inferior performance and risks exceeding MaxDirectMemory
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-Dio.netty.tryReflectionSetAccessible=true
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# The newline in the end of file is intentional
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