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From "Pavel Pervov" <pmcfi...@gmail.com>
Subject Re: [generic][launcher] help for drlvm specific properties
Date Wed, 20 Jun 2007 12:31:29 GMT
Why adding URL to -X? Help on -X should be printed with 'java -X'. BTW,
DRLVM does not print anything - launcher does not pass -X to DLRVM.

Pavel.

P.S. BTW, what I've proposed will solve this issue.

On 6/20/07, Gregory Shimansky <gshimansky@apache.org> wrote:
>
> Pavel Pervov wrote:
> > Vladimir,
> >
> > 'java -X' usually prints out help on options, which start with -X.
> >
> > What you was asking about as I understood that has syntax of
> > -XX:<vm_option>[=<value>]. Sun's VM has help on these options on the
Web
> > page and no means to print it out to console.
> >
> > So, I'm -1 here for printing help on -XX options.
>
> I agree that it is better to provide help on DRLVM internal properties
> on web site instead of printing it to console. We can also have a man
> page in the future which would include that text too.
>
> Adding an URL to help on -X is a good idea.
>
> > If community still decide to print such help - there is 4-th way to do
> so
> > (which will require changing.launcher).
> > 1) launcher recognizes several generic options and is able to determine
> > application class or jar name.
> > 2) if no -vmdir or -vmdll is specified on command line - launcher tries
> to
> > load that VM, otherwise defaults to <launcher
> location>/default/harmonyvm
> > and tryies to load this one. If it fails - it prints short help message
> as
> > it does right now, when launched with some unrecognizable property name.
> > 3) if library is loaded successfully - launcher constructs arguments
> array
> > (as it does right now) and calls to JNI_CreateJavaVM from loaded VM
> > library.
> > 4) if this call returns (-?, -h, -help and -X do not return from
> > JNI_CreateJavaVM) and if launcher finds class of jar name on the command
> > line - it proceeds with program startup.
> >
> > What do you think on such generic startup sequence?
> >
> > WBR,
> >    Pavel.
> >
> > On 6/20/07, Vladimir Beliaev <vladimir.k.beliaev@gmail.com> wrote:
> >>
> >> Hello, All
> >>
> >> I want to add a *help *for drlvm specific system properties like '-
> >> Xvm.assert_dialog=false' (as asked in
> >> HARMONY-3409<http://issues.apache.org/jira/browse/HARMONY-3409>
> >> ).
> >>
> >> *Could you send your opinion on what way this can be done?* There are
> >> three
> >> safe ways to do this & non of them seems to be really good (please see
> >> technical details in
> >> HARMONY-3409<http://issues.apache.org/jira/browse/HARMONY-3409>).
> >>
> >>
> >> *way 1*: support 'java -Xhelp:prop foo' command line... Like if one
> runs
> >> 'java -X' then this help says "run '-Xhelp:prop foo' to see sytem
> >> properties"... In short: if one does not specify this 'foo' at the end,
> >> then
> >> a generic launcher consider command line as broken (no 'mainClass' is
> >> specified) & does not invoke JNI_CreateJavaVM (which print a help)...
> >>
> >> *way 2*: support 'java -Xhelp:prop' command line (i.e. w/o dummy
> >> 'foo')...
> >> To implement this the *generic* launcher is to be changed to recognize
> >> '-Xhelp:' as a 'help' option (like it recognizes ? -h -help -X now).
> >> Because
> >> of other VMs do not support such a '-Xhelp:' option we get
> >> *generic*launcher to be a bit drlvm-specific...
> >>
> >> *way 3*: be like other VMs and do not print a 'help for drlvm internal
> >> properties'. Instead, 'java -X' help output may provide a URL to
> >> harmony.apache.org html document explaining drlvm internal system
> >> properties...
> >>
> >> I would pick a *way 1* as it does not change *generic *launcher & we
> are
> >> free to do every thing we want with -X... I do not like *way 3* at all
> -
> >> it
> >> is not a big deal to create such a document, still it is one more
> >> document
> >> to be supported (I believe it may become out-of-date pretty in couple
> >> months)...
> >>
> >> So, what do you think?
> >>
> >> --
> >> Thanks
> >> Vladimir Beliaev
> >> Intel Middleware Products Division
> >>
> >
> >
> >
>
>
> --
> Gregory
>
>


-- 
Pavel Pervov,
Intel Enterprise Solutions Software Division

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