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Subject: RE: JVM args
Date: Thu, 24 May 2007 20:57:53 -0500
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Thread-Topic: JVM args
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From: "Joshi, Shrinivas" <Shrinivas.Joshi@amd.com>
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Egor,

Thanks a bunch for elaborate information. This helps a lot.

-Shrinivas

-----Original Message-----
From: news [mailto:news@sea.gmane.org] On Behalf Of Egor Pasko
Sent: Thursday, May 24, 2007 8:51 PM
To: dev@harmony.apache.org
Subject: Re: JVM args

On the 0x2E0 day of Apache Harmony Shrinivas Joshi wrote:
> Hi Egor,
>=20
> Thanks much for the info. I think I should have been clearer about my
> question. I had managed to look at these options but it was not clear
> about how to use them.
>=20
> e.g.
>=20
> -Xjit <JIT options> //Couldn't find out the possible values of <JIT
> options>

Unfortunately, this one is outdated. All options to JIT are passed
through the PMF ([1]). It is not a very easy reading, but the tool is
rather powerful.

BTW, there is a comprehensive list of examples in [2] that covers some
basic JIT tricks as well.

used as -XX:jit.blablabla now

> --Xgc:<gc options> //Couldn't find out possible values of <gc options>

Now as -XX:gc.blablabla, if I am not mistaken.. See [2].

> -Xem:<em options> //Couldn't find out possible values of <em options>

This one is used as:
-Xem:jet
-Xem:opt
-Xem:client
-Xem:server
...

The option just tells to take configuration from jet.emconf,
opt.emconf, etc. located in <jdk>/jre/bin/default/. You can add more
options directly into these configuration files. client.emconf is used
by default.

[1] http://harmony.apache.org/subcomponents/drlvm/JIT_PMF.html

[2] http://wiki.apache.org/harmony/DrlvmCommandLineOptions

> Thanks,
> -Shrinivas
>=20
> -----Original Message-----
> From: news [mailto:news@sea.gmane.org] On Behalf Of Egor Pasko
> Sent: Thursday, May 24, 2007 7:02 PM
> To: dev@harmony.apache.org
> Subject: Re: JVM args
>=20
> On the 0x2E0 day of Apache Harmony Shrinivas Joshi wrote:
> > Hi All,
> >=20
> > Can someone please point me to a page containing list of supported
JVM
> > arguments and possibly their description?
>=20
> I do not remember a page like that. Please, look at the common options
> printed by our main binary below. I can make it a wiki page and give
> you a link if you want :)
>=20
>=20
> shell> java -help
> Usage: java [-options] class [args...]
>         (to execute a method main() of the class)
>     or java [-options] -jar jarfile [args...]
>         (to execute the jar file)
>=20
> where options include:
>     -classpath <class search path of directories and zip/jar files>
>     -cp        <class search path of directories and zip/jar files>
>                   A ':' separated list of directories, jar archives,
>                   and zip archives to search for class file
>     -D<name>=3D<value>
>                   set a system property
>     -showversion  print product version and continue
>     -version      print product version and exit
>     -verbose[:class|:gc|:jni]
>                   enable verbose output
>     -agentlib:<library name>[=3D<agent options>]
>                   load JVMTI agent library, library name is platform
> independent
>     -agentpath:<library name>[=3D<agent options]
>                   load JVMTI agent library, library name is platform
> dependent
>     -verify
>                   do full bytecode verification
>     -noverify
>                   do no bytecode verification
>     -enableassertions[:<package>...|:<class>]
>     -ea[:<package>...|:<class>]
>                   enable assertions
>     -disableassertions[:<package>...|:<class>]
>     -da[:<package>...|:<class>]
>                   disable assertions
>     -esa | -enablesystemassertions
>                   enable system assertions
>     -dsa | -disablesystemassertions
>                   disable system assertions
>     -? -help      print this help message
>     -help properties
>                   help on system properties
>     -X            print help on non-standard options
>=20
> shell> java -X
>     -Xbootclasspath:<PATH>
>               Set bootclasspath to the specified value
>     -Xbootclasspath/a:<PATH>
>               Append specified directories and files to bootclasspath
>     -Xbootclasspath/p:<PATH>
>               Prepend specified directories and files to bootclasspath
>     -Xjit <JIT options>
>               Specify JIT specific options
>     -Xms<size>
>               Set Java heap size
>     -Xmx<size>
>               Set maximum Java heap size
>     -Xdebug
>               Does nothing, this is a compatibility option
>     -Xnoagent
>               Does nothing, this is a compatibility option
>     -Xrun
>               Specify debugger agent library
>     -Xverbose[:<category>[:<file>]
>               Switch logging on [for specified category only
>               [and log that category to a file]]
>     -Xwarn[:<category>[:<file>]
>               Switch verbose logging off [for specified category only
>               [and log that category to a file]]
>     -Xverboseconf:<file>
>               Set up logging via log4cxx configuration file
>     -Xverboselog:<file>
>               Log verbose output to a file
>     -Xverify[:none|all]
>               Do full bytecode verification
>     -Xinvisible
>               Retain invisible annotations at runtime
>     -Xfileline
>               Add source information to logging messages
>     -Xthread
>               Add thread id to logging messages
>     -Xcategory
>               Add category name to logging messages
>     -Xtimestamp
>               Add timestamp to logging messages
>     -Xfunction
>               Add function signature to logging messages
>     -Xlog[:<category>[:<file>]
>               Switch debug logging on [for specified category only
>               [and log that category to a file]]
>     -Xtrace[:<category>[:<file>]
>               Switch trace logging on [for specified category only
>               [and log that category to a file]]
>     -Xstats:<mask>
>               Generates different statistics
>     -Xint
>               Use interpreter to execute the program
>     -Xgc:<gc options>
>               Specify gc specific options
>     -Xem:<em options>
>               Specify em specific options
>     -Xdumpstubs
>               Writes stubs generated by LIL to disk
>     -Xparallel_jit
>               Launch compilation in parallel (default)
>     -Xno_parallel_jit
>               Do not launch compilation in parallel
>     -Xdumpfile:<file>
>               Specifies a file name for the dump
>     -XX:<name>=3D<value>
>               set an internal system property
>=20
> many tricky options can be given with -XX:name=3Dvalue, but I cannot
> remember how to print them all with descriptions. For example, to see
> the JIT tricks you can specify -XX:jit.arg.help=3Dtrue
>=20
> --=20
> Egor Pasko
>=20
>=20
>=20
>=20
>=20
>=20

--=20
Egor Pasko