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From "Vladimir Beliaev" <vladimir.k.beli...@gmail.com>
Subject Re: [generic][launcher] help for drlvm specific properties
Date Wed, 20 Jun 2007 12:50:35 GMT
> DRLVM does not print anything - launcher does not pass -X to DLRVM.

Out of date information - Euege Ostrovsky has fixed this already :)

Ok, looks like WEB page & URL from 'java -X' is a solution. Let's follow
this one.

Thanks for you feedback.
Vladimir Beliaev


2007/6/20, Pavel Pervov <pmcfirst@gmail.com>:
>
> 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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