[Jython-dev] Re: passing args to java VM when invoking jython (Oti)

[Kevin J. B. <jyt...@sa...>]

>
>
>From: Oti <oh...@ya...>
>[ Curtis Brown ]
>  
>
>>I want to pass arguments to the java VM when I run jython, for
>>example
>>-mx1000m.  Is there a good way to do this other than writing my own
>>shell script equivalent jython of that prepends the args to the java
>>command line?
>>    
>>
>
>Probably - AFAIK - not. I suggest writing your own jython (or java)
>starter script, where you can set all of your VM args.
>
I've wanted this functionality before, too, but have always just 
modified the existing scripts.  :-)

But we should probably make jython & jython.bat allow it, how about the 
following (if no one objects, I'll check it in to the scripts in CVS and 
the installer/ templates):

---- jython.bat (ignore the specific file paths):

java %JVM_ARGS% "-Dpython.home=w:/tools/jython" -classpath 
"w:\tools\jython\jython.jar;%CLASSPATH%" org.python.util.jython %ARGS%

--- jython (ignore specific file paths):
java $JVM_ARGS -Dpython.home="$CP_ROOT_SRC/tools/jython" -classpath 
"$CP_ROOT_SRC/tools/jython/jython.jar;$CLASSPATH" 
"org.python.util.jython" "$@"

This lets you do the following:

$ export JVM_ARGS="-Dp1=1 -Xms1000m -Xmx1000m"
$ ./jython
Jython 2.1 on java1.3.1_05 (JIT: null)
Type "copyright", "credits" or "license" for more information.
 >>> import java
 >>> java.lang.Runtime.getRuntime().totalMemory()
1048313856L
 >>>

You can also write this as:

JVM_ARGS="-Dp1=1 -Xms1000m -Xmx1000m" ./jython

And it works similarly in Windows shell::

 >set JVM_ARGS=-Dp1=1 -Xms1000m -Xmx1000m
set JVM_ARGS=-Dp1=1 -Xms1000m -Xmx1000m
 >jython
Jython 2.1 on java1.4.1 (JIT: null)
Type "copyright", "credits" or "license" for more information.
 >>> import java
 >>> java.lang.Runtime.getRuntime().totalMemory()
1040515072L
 >>>

(Yes, you can do getProperty( "p1" ) as well...)

Fair enough?

kb