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Problem(Abstract) |
This describes the Java™ virtual machine (JVM™) default
values for -Xms (minimum heap size) and -Xmx (maximum heap size) if they
are not set within WebSphere® Application Server. Note that if the initial
and maximum heap values are set in WebSphere Application Server, it will
override these default values. |
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Resolving the
problem |
When initial and maximum heap values are set in WebSphere
Application Server, default values are overridden.
To determine if these values are set in WebSphere Application Server, use
the administrative console to navigate to the appropriate tab for the JVM
settings. If the "initial heap size" or "maximum
heap size" fields are blank, the following default values
will be used.
Default sizes for -Xmx (maximum heap size)
- 1.2.2 and 1.3.0
- Microsoft® Windows®: Half the real storage with a
minimum of 16 M and a maximum of 2 G
- AIX®, z/OS, Linux®, Solaris™: 64 M
- 1.3.1
- Windows: Half the real storage with a minimum of 16 M
and a maximum of 2 G
- AIX, and z/OS: 64 M
- Linux: Half the real storage with a minimum of 16 M and
a maximum of 512 M
- Solaris: 64 M
- HP-UX: 64 M
- 1.4.1
- Windows: Half the real storage with a minimum of 16 M
and a maximum of 2 G
- AIX, and z/OS: 64 M
- Linux: Half the real storage with a minimum of 16 M and
a maximum of 512 M
- Solaris: 64 M
- HP-UX: 64 M
- 1.4.2
- Windows: Half the real storage with a minimum of 16 M
and a maximum of 2 G
- AIX, and z/OS: 64 M
- Linux: Half the real storage with a minimum of 16 M and
a maximum of 512 M
- Solaris: 64 M
- HP-UX: 64 M
Default sizes for -Xms (minimum heap size)
- 1.2.2 and 1.3.0
- Windows: 4 M
- AIX, z/OS, Linux, Solaris: 1 M
- 1.3.1
- Windows, AIX, Linux: 4 M
- z/OS: 1 M
- Solaris: 3584k
- HP-UX: 2 M
- 1.4.1
- Windows, AIX, Linux: 4 M
- z/OS: 1 M
- Solaris: 1 M
- HP-UX: 2 M
- 1.4.2
- Windows, AIX, Linux: 4 M
- z/OS: 1 M
- Solaris: 3670k
- HP-UX: 2 M
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Cross Reference information |
Segment |
Product |
Component |
Platform |
Version |
Edition |
Application Servers |
WebSphere Application Server for z/OS |
Not Applicable |
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Application Servers |
Runtimes for Java Technology |
Java SDK |
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