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JVM Memory

 
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# 1  
Old 08-21-2015
JVM Memory
Hi all,

I am starting a JVM in unix and when I use ps command on the pid of process starting JVM the output is something like this :-

Code:
java -Xms32M -Xmx64M -Xmx128M

I need to know what would be the value of Xmx in this case.
And how to check that this value be picked while starting JVM for both Linux and Solaris.

Thanks in advance
# 2  
Old 08-21-2015
The last option would probably override it.

Why do you need the two redundant options, however?
# 3  
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)

This User Gave Thanks to jlliagre For This Post:
drl
# 4  
Old 08-23-2015
I am getting this error:-

Code:
Unrecognized option: -XshowSettings:vm
Could not create the Java virtual machine.

I am using java 1.6 and this option is available in java 1.7
Last edited by Raj999; 08-24-2015 at 01:04 AM..
 
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