77 lines
2.6 KiB
Plaintext
77 lines
2.6 KiB
Plaintext
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###########################################################################
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# jvm8-server.options #
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# #
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# See jvm-server.options. This file is specific for Java 8 and newer. #
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###########################################################################
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########################
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# GENERAL JVM SETTINGS #
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########################
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# allows lowering thread priority without being root on linux - probably
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# not necessary on Windows but doesn't harm anything.
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# see http://tech.stolsvik.com/2010/01/linux-java-thread-priorities-workaround.html
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-XX:ThreadPriorityPolicy=42
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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:+UseParNewGC
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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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### GC logging options -- uncomment to enable
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-XX:+PrintGCDetails
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-XX:+PrintGCDateStamps
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-XX:+PrintHeapAtGC
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-XX:+PrintTenuringDistribution
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-XX:+PrintGCApplicationStoppedTime
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-XX:+PrintPromotionFailure
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#-XX:PrintFLSStatistics=1
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#-Xloggc:/var/log/cassandra/gc.log
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-XX:+UseGCLogFileRotation
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-XX:NumberOfGCLogFiles=10
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-XX:GCLogFileSize=10M
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# The newline in the end of file is intentional
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