![]() ![]() This can also be checked with a curl request: Master-1 | heap size, compressed ordinary object pointers Master-1 | using data paths, mounts ], net usable_space, net total_space, spins?, types Feature ~/source/elastic/tmp/issue#22 $ docker-compose upĬreating network "issue22_default" with the default driver Indeed, the bin/es-docker entrypoint only appends the Xmx and Xms in the ES_JAVA_OPTS variable. ![]() For example, you can use the EXTRA_SYSPROPERTIES variable in ttings to set the max heap size to 4G by using:įrom the Java docs, -Xmx sets the maximum heap size, but the application can use more memory than that.1 elastics 257:21 /usr/lib/jvm/java-1.8-openjdk/bin/java -Xms2g -Xmx2g -XX:+UseConcMarkSweepGC -XX:CMSInitiatingOccupancyFraction=75 -XX:+UseCMSInitiatingOccupancyOnly -XX:+DisableExplicitGC -XX:+AlwaysPreTouch -server -Xss1m =true -Dfile.encoding=UTF-8 -Djna.nosys=true -Djdk.io.permissionsUseCanonicalPath=true =true =true -Dlog4j.shutdownHookEnabled=false =true -Dlog4j.skipJansi=true -XX:+HeapDumpOnOutOfMemoryError -Xms512m -Xmx512m =/usr/share/elasticsearch -cp /usr/share/elasticsearch/lib/elasticsearch-5.1.1.jar:/usr/share/elasticsearch/lib/* -Ecluster.name=docker-cluster .hosts=master-1,master-2 -Enode.data=true -Enode.master=false -Enode.name=data-3 _master_nodes=2 mory_lock=true =false -Enode.ingest=true You can pass these types of Java arguments to the license server when it is running as a service. In those situations, setting the Xmx limit can help. You may have some customers who indicate the RAM usage is much higher than 1/4 of the system memory. Releasing/acquiring memory is an expensive operation, so the JVM tends to hang on to the acquired memory for future use. But the biggest one is JVM heap.Īlso, once the JVM acquires the memory, it may not release it (even after the server is idle). Hence you would see extra memory usage apart from the enforced 512MB (which is normal). Please note that, -Xms limits the heap usage only, but there are other factors involved in the JVM, such as native components, gc, etc. Your numbers may vary, depending on the other factors like number of request per second, number of licenses requested etc. Here are the results of one such in-house experiment (all tests were run on a 64 bit JVM). It is not required to set -Xmx in a production environment, but you could limit heap usage for your testing by supplying the -Xmx switch to Java. ![]() For example, it is not an adequate comparison to say a 64 bit JVM uses 8GB for x requests while a 32 bit JVM uses 4GB for x-thousand requests. You should not compare 32 bit with 64 bit processes with regard to memory usage, as 32 bit processes cannot acquire memory more than 4GB (that's the limit). QuestionCan you use the Java Xmx and Xms options to limit the amount of memory used by the local license server (LLS)?ĪnswerBy default, Java uses around 1/4th of system memory as a heap. Summar圜an you use the Java Xmx and Xms options to limit the amount of memory used by the local license server (LLS)?
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