Re: [xep-support] JIT Compiler "off" not found

From: Chris Braddock (
Date: Mon Sep 15 2003 - 08:02:09 PDT

  • Next message: Alexander Peshkov: "Re: [xep-support] Keep-together precedence"

    Thanks Werner. Here's some info:

    # /usr/java130/bin/java
    Usage: java [-options] class [args...]
               (to execute a class)
       or java -jar [-options] jarfile [args...]
               (to execute a jar file)

    where options include:
        -cp -classpath <directories and zip/jar files separated by :>
                  set search path for application classes and resources
                  set a system property
                  enable verbose output
        -version print product version
        -showversion print product version and continue
        -? -help print this help message
        -X print help on non-standard options

    # /usr/java130/bin/java -X
        -Xbootclasspath:<directories and zip/jar files separated by ;>
                          set search path for bootstrap classes and resources
        -Xbootclasspath/a:<directories and zip/jar files separated by ;>
                          append to end of bootstrap class path
        -Xbootclasspath/p:<directories and zip/jar files separated by ;>
                          prepend in front of bootstrap class path
        -Xnoclassgc disable class garbage collection
        -Xms<size> set initial Java heap size
        -Xmx<size> set maximum Java heap size
        -Xss<size> set the maximum native stack size for any thread
        -Xos<size> set the maximum Java stack size for any thread
        -Xrs reduce the use of OS signals
        -Xcheck:jni perform additional checks for JNI functions
        -Xcheck:nabounds perform additional checks for JNI array operations
        -Xrunhprof[:help]|[:<option>=<value>, ...]
                          perform heap, cpu, or monitor profiling
        -Xdebug enable remote debugging
        -Xfuture enable strictest checks, anticipating future default

    The -X options are non-standard and subject to change without notice.

    # /usr/java130/bin/java -version
    java version "1.3.0"
    Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.0)
    Classic VM (build 1.3.0, J2RE 1.3.0 IBM build ca130-20020504 (JIT enabled:

    >The only error I see is that strictly speaking "-Xmx400mb" should be
    >but I fail to see how that could affect JIT settings. The only way I know
    >in JDK1.3
    >to turn of the JIT is with the option -Xint. By default the client HotSpot
    >JIT is
    >All this is of course about the Sun JRE. I think you use the one from IBM.
    >Could you
    >therefore send the usage string of the java command?
    >Chris Braddock wrote:
    >>>What is the complete command-line you use?
    >>I use a modified I had a bootstrap classpath problem that
    >>prompted the -Xbootclasspath addition.
    >># This script encapsulates a standard XEP call.
    >>$JAVA_HOME/bin/java -Xmx400mb
    >>ar -classpath $CP -Dcom.renderx.xep.ROOT=$XEP_HOME
    >>com.renderx.xep.XSLDriver $*
    >>set CP=
    >>>Chris Braddock wrote:
    >>>>>Wondering if anyone can help with this error:
    >>>>>#Warning: JIT compiler "off" not found. Will use interpreter.
    >>>>>XEP still performs as expected, however I'm not a Unix or Java guy, but
    >>>>>as I understand it, a JIT compiler should give a performance boost to
    >>>>>(the XEP) java code. If this is correct, I'd definitely like to take
    >>>>>advantage of it.
    >>>>>Opsys is Aix 4.3.
    >>>>>Java 1.3.0

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