14.4 Default values of the Java HotSpot VM options that can be specified in Cosminexus
This section displays the default value of the Java HotSpot VM options. The default value differs for each OS.
- Tip
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The default values described in this section are the initial values defined in the Java HotSpot VM.
When a J2EE server, batch server, or Java application is started, for some keys, the default values specified by using add.jvm.arg keys in the respective option definition file might override the default values shown in this section.
For details about the default values in the respective option definition file, see 2.2.2 usrconf.cfg (Option definition file for J2EE servers), 3.2.1 usrconf.cfg (Option definition file for batch servers), or 12.2.1 usrconf.cfg (Option definition file for Java applications).
The following table describes the default values of the Java HotSpot VM options for each OS: For details about the Java HotSpot VM options that can be specified in Application Server, see 14.5 Java HotSpot VM options that can be specified in Cosminexus.
|
No. |
Option name |
Types of OS and JavaVM to be used |
||
|---|---|---|---|---|
|
Windows |
Linux |
AIX |
||
|
[server] |
[server] |
[server] |
||
|
1 |
-Xmxsize#1 |
83M |
83M |
83M |
|
2 |
-Xmssize#1 |
7.8M |
7.8M |
7.8M |
|
3 |
-XX:MaxMetaspaceSize=size#1 |
264-1 |
264-1 |
264-1 |
|
4 |
-XX:MetaspaceSize=size#1 |
16M |
16M |
16M |
|
5 |
-XX:CompressedClassSpaceSize=size#1 |
1G |
1G |
1G |
|
6 |
-Xmnsize |
#3 |
#3 |
#3 |
|
7 |
-Xsssize |
1M |
1M |
1M |
|
8 |
-XX:NewRatio=value#1 |
2 |
2 |
2 |
|
9 |
-XX:SurvivorRatio=value#2 |
8 |
32 |
8 |
|
10 |
-XX:TargetSurvivorRatio=value |
50 |
50 |
50 |
|
11 |
-XX:MaxTenuringThreshold=value |
14 |
14 |
14 |
|
12 |
-XX:ReservedCodeCacheSize=size |
48M |
48M |
48M |
- Note:
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Unit of size is bytes.
- #1
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For J2EE servers, the default value of the add.jvm.arg key in the option definition file for J2EE servers (usrconf.cfg) is enabled. The default value of the option that is not defined in the add.jvm.arg key is the value mentioned in this table.
- #2
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The default JavaVM values are overwritten on the J2EE server executed in the J2EE server mode. The default value after overwriting is -XX:SurvivorRatio=8. This is common in all platforms.
- #3
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Decided according to the Java heap and -XX:NewRatio.