NonStop Server for Java Programmer's Reference (NSJ 4.2+)

generation. The parameters for the young-generation heap are listed below:
XX:NewRatio=nn The ratio between the young and old.●
XX:NewSize=nn The lower size bound.●
XX:MaxNewSize=nn The upper size bound.●
XX:SurvivorRatio=nn Tune the survivor spaces (illustrated in the Layout for Generations).●
For example:
java Xms512m Xmx512m XX:NewSize=256m XX:MaxNewSize=256m \
XX:SurvivorRatio=2 class
These options inform the JVM to set the initial size of the heap to 512 MB, the maximum heap to 512 MB, the new
generation to 256 MB (128 MB belongs to Eden and 2x64 MB survivor) and the old generation to 256 MB.
For details about all these parameters, see Java HotSpot VM Options
(http://java.sun.com/docs/hotspot/VMOptions.html)
For details about tuning garbage collection with the 1.4.2 Java Virtual Machine and for general performance tuning
information, see:
Tuning Garbage Collection with the 1.4.2 Java Virtual Machine
(http://java.sun.com/docs/hotspot/gc1.4.2/index.html)
●
The article Tuning Java I/O Performance
(http://java.sun.com/developer/technicalArticles/Programming/PerfTuning/)
●
The article, Turbo-charging Java HotSpot Virtual Machine, v1.4.x to Improve the Performance and
Scalability of Application Servers (http://java.sun.com/developer/technicalArticles/Programming/turbo/)
●
Java Performance Documentation (http://java.sun.com/docs/performance/)●
Note:
As described earlier, the NonStop Server for Java 4 does not support the throughput collector
(specified with the option XX:+UseParallelGC ) or the concurrent low pause collector
(specified with the option XX:+UseConcMarkSweepGC ).
●
Also, the following options do not apply either for the NonStop Server for Java 4 or the
NonStop system:
●
-XX:+UseBoundThreads  Option to bind user level threads; Solaris specific
-XX:+UseAltSigs  Solaris specific.
-XX:+UseV8InstrsOnly  Only for Sparc (Solaris)
-XX:-AllowUserSignalHandlers  Solaris specific
-XX:AltStackSize=nn  Solaris specific
-XX:+MaxFDLimit  Solaris specific
-XX:-UseBoundThreads  Solaris specific
-XX:-UseLWPSynchronization  Solaris specific
-XX:PreBlockSpin=nn  Only for Linux
-XX:-UseISM  Solaris specific
-XX:-UseMPSS  Solaris specific
-XX:-UseSpinning  Only for Linux