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Full Discussion: JVM Memory
Top Forums UNIX for Dummies Questions & Answers JVM Memory Post 302952789 by jlliagre on Friday 21st of August 2015 04:24:48 PM
Old 08-21-2015
The standard behavior is to have the latest option overriding the previous ones. On most JVMs, you can verify the selected option with using -XshowSettings:vm, e.g.:
Code:
$ /opt/jdk1.8.0_05/bin/java -XshowSettings:vm -Xms32M -Xmx64M -Xmx128M -version
VM settings:
    Min. Heap Size: 32.00M
    Max. Heap Size: 128.00M
    Ergonomics Machine Class: server
    Using VM: Java HotSpot(TM) 64-Bit Server VM

java version "1.8.0_05"
Java(TM) SE Runtime Environment (build 1.8.0_05-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.5-b02, mixed mode)
$
$ /usr/lib/jvm/java-7-openjdk-amd64/bin/java -XshowSettings:vm -Xms32M -Xmx128M -Xmx64M -version
VM settings:
    Min. Heap Size: 32.00M
    Max. Heap Size: 64.00M
    Ergonomics Machine Class: server
    Using VM: OpenJDK 64-Bit Server VM

java version "1.7.0_79"
OpenJDK Runtime Environment (IcedTea 2.5.6) (7u79-2.5.6-0ubuntu1.14.04.1)
OpenJDK 64-Bit Server VM (build 24.79-b02, mixed mode)

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asadmin-delete-jvm-options(1AS) 				   User Commands				   asadmin-delete-jvm-options(1AS)

NAME
asadmin-delete-jvm-options, delete-jvm-options - deletes the JVM options from the Java configuration or profilerelements SYNOPSIS
delete-jvm-options --user admin_user [--password admin_password] [--host localhost] [--port 4848] [--secure|-s] [--passwordfile filename] [--terse=false] [--echo=false] [--interactive=true] [--profiler=false] (jvm_option_name=jvm_option_value)[:jvm_option_name=jvm_option_value]* Deletes the JVM options in the Java configuration or Profiler elements of the domain.xml file. You can enter more than one JVM option sepa- rated by a colon (:) . If the JVM option starts with a dash (-) then use two dashes (--) before the operand to distinguish that JVM option is an operand and not an option. JVM options are used to record the settings needed to get a particular profiler going. OPTIONS
--user authorized domain application server administrative username. --password password to administer the domain application server. --host machine name where the domain application server is running. --port port number of the domain application server listening for administration requests. --secure if true, uses SSL/TLS to communicate with the domain application server. --passwordfile file containing the domain application server password. --terse indicates that any output data must be very concise, typically avoiding human-friendly sentences and favoring well- formatted data for consumption by a script. Default is false. --echo setting to true will echo the command line statement on the standard output. Default is false. --interactive if set to true (default), only the required password options are prompted. --profiler indicates if the JVM options is for the profiler. Profiler must exist for this option to be true. OPERANDS
jvm_option_name=jvm_optithevleft side of the equal sign (=) is the JVM option name. The right side of the equal sign (=) is the jvm_option_value. Additionally, you can use ":" as a delimiter for more than one jvm-option. If the jvm-option con- tains a ":", use the escape character to offset the ":" delimiter. Example 1: Using delete-jvm-options with double dash (--) asadmin> delete-jvm-options --user admin --password adminadmin --host fuyako --port 7070 --profiler=true -- "-DDebug=true":"-Xmx256m":" -Dcom.sun.aas.imqBin"="/export/as7se/imq/bin" JVM options deleted Where the JVM options are created. The double dash (--) is used between --profiler options and the operand because - indicated the end of the options and the following text is the operand. The double dash (--) is necessary here since there are single dashes (i.e., --DDebug) in the operand. To distinguish between the options and the operand, the double dash (--) is used. EXIT STATUS
0 command executed successfully 1 error in executing the command asadmin-create-jvm-options(1AS) J2EE 1.4 SDK March 2004 asadmin-delete-jvm-options(1AS)
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