How to limit the maximum memory used by the JVM

Question

Dears
we enabled sybase webservice and started it , and now find the process is running much memory,
how could I limit the maximum memory used by the JVM ?
aidcd02:/> prstat -p 8164 -p 17768
   PID USERNAME  SIZE   RSS STATE  PRI NICE      TIME  CPU PROCESS/NLWP      
  8164 sybase   1079M  848M sleep   59    0   0:10:44 0.0% java/30  
aidcd02:/> pargs 8164
8164:   /sybase/shared/JRE-6_0_24/bin/java -Dsybase.home=/sybase -Docs.home=OCS-15_0 -D
argv[0]: /sybase/shared/JRE-6_0_24/bin/java
argv[1]: -Dsybase.home=/sybase
argv[2]: -Docs.home=OCS-15_0
argv[3]: -Dcom.sybase.ase.ws.libtcl=
argv[4]: -classpath
argv[5]: /sybase/WS-15_0/lib/axis.jar:/sybase/WS-15_0/lib/jaxrpc.jar:/sybase/WS-15_0/lib/saaj.jar:/sybase/WS-15_0/lib/commons-logging-1.0.4.jar:/sybase/WS-15_0/lib/commons-discovery-0.2.jar:/sybase/WS-15_0/lib/log4j-1.2.4.jar:/sybase/WS-15_0/lib/wsdl4j-1.5.1.jar:/sybase/jConnect-6_0/classes/jconn3.jar:/sybase/jConnect-6_0/classes/jTDS3.jar:/sybase/WS-15_0/lib/xercesImpl.jar:/sybase/WS-15_0/lib/xmlParserAPIs.jar:/sybase/WS-15_0/lib/server.jar:/sybase/WS-15_0/lib/sqlx.jar:/sybase/WS-15_0/lib/flexlm.jar:/sybase/WS-15_0/lib/servlet-api-2.5-20081211.jar:/sybase/WS-15_0/lib/jetty-6.1.22.jar:/sybase/WS-15_0/lib/jetty-sslengine-6.1.22.jar:/sybase/WS-15_0/lib/jetty-util-6.1.22.jar:/sybase/WS-15_0/lib/tools.jar:/sybase/WS-15_0/lib/jcert.jar:/sybase/WS-15_0/lib/jnet.jar:/sybase/WS-15_0/lib/jsse.jar:/sybase/WS-15_0/lib/jce1_2_2.jar:/sybase/WS-15_0/lib/sunjce_provider.jar:/sybase/WS-15_0/lib/ws.jar:/sybase/shared/lib/dsparser.jar:/sybase/WS-15_0/props:/sybase/WS-15_0/producer/WEB-INF
thanks.

Answer 1

You can limit the maximum memory used via command line options to the VM.
Noting of course that typically if you are in fact actually using that memory that reducing it is going to have some negative impact on your application including catastrophic failure.
Conversely if the application is not in fact actively using that memory then limiting it just because some tool reports that the OS has reserved it then limiting it is pointless.