On an intel linux platform, what are the default java parameters that are used when starting WebSphere Application Server ? java -Xmx… etc ?

You will find below ALL the user arguments used with the WAS 8 JVM. 

This was taken for a javacore triggered on WAS8 on a Windows 2003 Server 64 bit WAS install.

2CIUSERARG               -Xms50m

2CIUSERARG               -Xmx256m

How to take a javacore

wsadmin>set objectName [$AdminControl queryNames WebSphere:type=JVM,process=server1,*]

wsadmin>$AdminControl invoke $objectName dumpThreads

Look for Javacore filename:   C:\WebSphere8\m1116.12\profiles\AppSrv01\javacore.20110708.115112.4824.0001.txt

Complete List

1CIUSERARGS    UserArgs:

2CIUSERARG               -Xoptionsfile=C:\WebSphere8\m1116.12\java\jre\bin\compressedrefs\options.default

2CIUSERARG               -Xlockword:mode=default,noLockword=java/lang/String,noLockword=java/util/MapEntry,noLockword=java/util/HashMap$Entry,noLockword=org/apache/harmony/luni/util/ModifiedMap$Entry,noLockword=java/util/Hashtable$Entry

2CIUSERARG               -XXgc:numaCommonThreadClass=java/lang/UNIXProcess$*

2CIUSERARG               -Xjcl:jclscar_26

2CIUSERARG               -Dcom.ibm.oti.vm.bootstrap.library.path=C:\WebSphere8\m1116.12\java\jre\bin\compressedrefs;C:\WebSphere8\m1116.12\java\jre\bin

2CIUSERARG               -Dsun.boot.library.path=C:\WebSphere8\m1116.12\java\jre\bin\compressedrefs;C:\WebSphere8\m1116.12\java\jre\bin

2CIUSERARG               -Djava.library.path=C:\WebSphere8\m1116.12\java\jre\bin\compressedrefs;C:\WebSphere8\m1116.12\java\jre\bin;.;C:\WebSphere8\m1116.12\lib\native\win\x86_64;C:\WebSphere8\m1116.12\bin;C:\WebSphere8\m1116.12\java\bin;C:\WebSphere8\m1116.12\java\jre\bin;C:\WINNT\system32;C:\WINNT;C:\WINNT\System32\Wbem;C:\development\tools\bin;C:\development\nt_java\java\bin;C:\development\tools\apache-maven-3.0.3\bin;C:\development\tools\SlikSvn\bin\;%M2%;%JAVA_HOME%\bin;C:\cygwin\bin;c:\vslick\win;C:\development\tools\apache-maven-3.0.3\bin;C:\cygwin\bin;C:\development\tools\bin;

2CIUSERARG               -Djava.home=C:\WebSphere8\m1116.12\java\jre

2CIUSERARG               -Djava.ext.dirs=C:\WebSphere8\m1116.12\java\jre\lib\ext

2CIUSERARG               -Duser.dir=C:\WebSphere8\m1116.12\profiles\AppSrv01

2CIUSERARG               _j2se_j9=1119744 0x000007FFFF237160

2CIUSERARG               -Dconsole.encoding=Cp850

2CIUSERARG               -Djava.class.path=C:\WebSphere8\m1116.12\profiles\AppSrv01\properties;C:\WebSphere8\m1116.12\properties;C:\WebSphere8\m1116.12\lib\startup.jar;C:\WebSphere8\m1116.12\lib\bootstrap.jar;C:\WebSphere8\m1116.12/lib/lmproxy.jar;C:\WebSphere8\m1116.12/lib/urlprotocols.jar;C:\WebSphere8\m1116.12\java\lib\tools.jar

2CIUSERARG               -Declipse.security

2CIUSERARG               -Dwas.status.socket=2121

2CIUSERARG               -Dosgi.install.area=C:\WebSphere8\m1116.12

2CIUSERARG               -Dosgi.configuration.area=C:\WebSphere8\m1116.12\profiles\AppSrv01/servers/server1/configuration

2CIUSERARG               -Dosgi.framework.extensions=com.ibm.cds,com.ibm.ws.eclipse.adaptors

2CIUSERARG               -Xshareclasses:name=webspherev80,nonFatal

2CIUSERARG               -Dsun.reflect.inflationThreshold=250

2CIUSERARG               -Xbootclasspath/p:C:\WebSphere8\m1116.12/java/jre/lib/ext/ibmorb.jar;C:\WebSphere8\m1116.12/java/jre/lib/ext/ibmext.jar

2CIUSERARG               -Djava.class.path=C:\WebSphere8\m1116.12\profiles\AppSrv01/properties;C:\WebSphere8\m1116.12/properties;C:\WebSphere8\m1116.12/lib/startup.jar;C:\WebSphere8\m1116.12/lib/bootstrap.jar;C:\WebSphere8\m1116.12/lib/jsf-nls.jar;C:\WebSphere8\m1116.12/lib/lmproxy.jar;C:\WebSphere8\m1116.12/lib/urlprotocols.jar;C:\WebSphere8\m1116.12/deploytool/itp/batchboot.jar;C:\WebSphere8\m1116.12/deploytool/itp/batch2.jar;C:\WebSphere8\m1116.12/java/lib/tools.jar

2CIUSERARG               -Dibm.websphere.internalClassAccessMode=allow

2CIUSERARG               -Xms50m

2CIUSERARG               -Xmx256m

2CIUSERARG               -Xcompressedrefs

2CIUSERARG               -Xscmaxaot4M

2CIUSERARG               -Xscmx60M

2CIUSERARG               -Dws.ext.dirs=C:\WebSphere8\m1116.12/java/lib;C:\WebSphere8\m1116.12\profiles\AppSrv01/classes;C:\WebSphere8\m1116.12/classes;C:\WebSphere8\m1116.12/lib;C:\WebSphere8\m1116.12/installedChannels;C:\WebSphere8\m1116.12/lib/ext;C:\WebSphere8\m1116.12/web/help;C:\WebSphere8\m1116.12/deploytool/itp/plugins/com.ibm.etools.ejbdeploy/runtime

2CIUSERARG               -Dderby.system.home=C:\WebSphere8\m1116.12/derby

2CIUSERARG               -Dcom.ibm.itp.location=C:\WebSphere8\m1116.12/bin

2CIUSERARG               -Djava.util.logging.configureByServer=true

2CIUSERARG               -Duser.install.root=C:\WebSphere8\m1116.12\profiles\AppSrv01

2CIUSERARG               -Djava.ext.dirs=C:\WebSphere8\m1116.12/tivoli/tam;C:\WebSphere8\m1116.12/java/jre/lib/ext

2CIUSERARG               -Djavax.management.builder.initial=com.ibm.ws.management.PlatformMBeanServerBuilder

2CIUSERARG               -Dpython.cachedir=C:\WebSphere8\m1116.12\profiles\AppSrv01/temp/cachedir

2CIUSERARG               -Dwas.install.root=C:\WebSphere8\m1116.12

2CIUSERARG               -Djava.util.logging.manager=com.ibm.ws.bootstrap.WsLogManager

2CIUSERARG               -Dserver.root=C:\WebSphere8\m1116.12\profiles\AppSrv01

2CIUSERARG               -Dcom.ibm.security.jgss.debug=off

2CIUSERARG               -Dcom.ibm.security.krb5.Krb5Debug=off

2CIUSERARG               -Djava.library.path=C:\WebSphere8\m1116.12/lib/native/win/x86_64/;C:\WebSphere8\m1116.12\java\jre\bin\default;C:\WebSphere8\m1116.12\java\jre\bin;.;C:\WebSphere8\m1116.12\lib\native\win\x86_64;C:\WebSphere8\m1116.12\bin;C:\WebSphere8\m1116.12\java\bin;C:\WebSphere8\m1116.12\java\jre\bin;C:\WINNT\system32;C:\WINNT;C:\WINNT\System32\Wbem;C:\development\tools\bin;C:\development\nt_java\java\bin;C:\development\tools\apache-maven-3.0.3\bin;C:\development\tools\SlikSvn\bin\;%M2%;%JAVA_HOME%\bin;C:\cygwin\bin;c:\vslick\win;C:\development\tools\apache-maven-3.0.3\bin;C:\cygwin\bin;C:\development\tools\bin;

2CIUSERARG               -Djava.endorsed.dirs=C:\WebSphere8\m1116.12/endorsed_apis;C:\WebSphere8\m1116.12/java/jre/lib/endorsed;C:\WebSphere8\m1116.12\endorsed_apis;C:\WebSphere8\m1116.12\java\jre\lib\endorsed

2CIUSERARG               -Djava.security.auth.login.config=C:\WebSphere8\m1116.12\profiles\AppSrv01/properties/wsjaas.conf

2CIUSERARG               -Djava.security.policy=C:\WebSphere8\m1116.12\profiles\AppSrv01/properties/server.policy

2CIUSERARG               -Dsun.java.command=com.ibm.wsspi.bootstrap.WSPreLauncher -nosplash -application com.ibm.ws.bootstrap.WSLauncher com.ibm.ws.runtime.WsServer C:\WebSphere8\m1116.12\profiles\AppSrv01\config smitaNode03Cell smitaNode03 server1

2CIUSERARG               -Dsun.java.launcher=SUN_STANDARD

2CIUSERARG               _port_library 0x000007FFFF235F20

2CIUSERARG               _bfu_java 0x000007FFFF238230

2CIUSERARG               _org.apache.harmony.vmi.portlib 0x0000000000151140