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From "Leo Li" <liyilei1...@gmail.com>
Subject Re: [classlib][luni]Runtime.exec fails on Linux
Date Tue, 17 Oct 2006 06:49:23 GMT
Hi, all:
     I tried to build drlvm on linux, but when build update, it reports such
error:

     [echo] downloading XALAN from no_settings_in_config_or_environment
     [echo] no_settings_in_config_or_environment

BUILD FAILED
/root/workspaces/workspace/drlvm/build/make/build.xml:240: The following
error occurred while executing this line:
/root/workspaces/workspace/drlvm/build/make/setup.xml:273: The following
error occurred while executing this line:
/root/workspaces/workspace/drlvm/build/make/setup.xml:275: The following
error occurred while executing this line:
/root/workspaces/workspace/drlvm/build/make/setup.xml:442: Warning: Could
not find file
/root/workspaces/workspace/drlvm/build/make/no_settings_in_config_or_environment
to copy.

How can I do with it?
Thanks.



On 10/17/06, Alexey Varlamov <alexey.v.varlamov@gmail.com> wrote:
>
> 2006/10/16, Leo Li <liyilei1979@gmail.com>:
> > It seems not quite related to actual memory stress although the reported
> > error is ENOMEM.
> > I have run it both in eclipse and console. And there are enough memory
> > available.
> >
> > Furthermore, the case can be repeated even though in the same time a C
> > program runs well when using fork().
> >
> > I suspect that it is related with VM since it can be only reproduced by
> VM
> > calling it. I am not sure whether vm does something behind me, but I
> have
> > not thought out of a way that a user-space program have such effect.:)
> >
> Actually drlvm provides own impl of j.l.Process. Interesting, would it
> work if switched to classlib's impl - then this should be process impl
> issue. Could you please try the following patch with DRLVM and see if
> it works?
>
> Index: vm/vmcore/src/kernel_classes/javasrc/java/lang/Runtime.java
> ===================================================================
> --- vm/vmcore/src/kernel_classes/javasrc/java/lang/Runtime.java
> (revision 464817)
> +++ vm/vmcore/src/kernel_classes/javasrc/java/lang/Runtime.java (working
> copy)
> @@ -743,14 +743,15 @@
>          //#IN004# Should we check: envp != null ?
>          //#IN004# Should we check envp's direction values: envp[i] !=
> null ?
>
> -        String dirPathName = (dir != null ? dir.getPath() : null);
> +        //String dirPathName = (dir != null ? dir.getPath() : null);
>
> -        SubProcess sp = new SubProcess();
> +        //SubProcess sp = new SubProcess();
>
> -        sp.execVM(cmdarray, envp, dirPathName);
> +        //sp.execVM(cmdarray, envp, dirPathName);
>
> -        return sp;
> -
> +        //return sp;
> +        return org.apache.harmony.luni.internal.process.SystemProcess.
> +             create(cmdarray, envp == null ? new String[0] : envp, dir);
>      }
>
>
> --
> Alexey
>
> >
> > On 10/16/06, Geir Magnusson Jr. <geir@pobox.com> wrote:
> > >
> > > I'm confused.  Didn't you just report this on Ubuntu?
> > >
> > > I have had similar forking problems on Ubuntu 6 (I once found a bug in
> > > classlib related to forking...).
> > >
> > > I never figured out why Unbuntu does this, but it seemed that under
> > > memory stress, Ubuntu's fork() fails.  Try this - close Eclipse and
> run
> > > the test again...
> > >
> > > geir
> > >
> > >
> > > Leo Li wrote:
> > > > Thank you.
> > > > I have just run it on drlvm of unbuntu, it works.
> > > > What a qurious problem!
> > > >
> > > >
> > > > On 10/16/06, Alexey Varlamov <alexey.v.varlamov@gmail.com> wrote:
> > > >>
> > > >> Both DRLVM and J9 works for me (SUSE9).
> > > >>
> > > >> --
> > > >> Alexey
> > > >>
> > > >> 2006/10/16, Leo Li <liyilei1979@gmail.com>:
> > > >> > Hi, all:
> > > >> >     The harmony Runtime.exec fails on Linux with ENOMEM.
> > > >> >     Here is the testcase:
> > > >> >
> > > >> > public class Exec {
> > > >> >    public static void main(String[] args) throws Exception {
> > > >> >
> > > >> >       Runtime.getRuntime().exec("ls");    }
> > > >> > }
> > > >> >
> > > >> >    I have tried it on RedHat Enterprise 4 and Unbuntu, both get
> > > ENOMEM
> > > >> in
> > > >> > native code.
> > > >> >
> > > >> >    After digging into it, I found it fails in procimpl.c, line
> 135:
> > > >> >
> > > >> >        grdpid = fork ();
> > > >> >
> > > >> >    If the call to fork is changed to vfork, the testcase will
> pass
> > > but
> > > >> > still get exitcode = 1 which indicates that some error has
> happened.
> > > >> The
> > > >> > difference between fork and vfork is just whether page tables
is
> > > copied
> > > >> to
> > > >> > child process or not. But I do not think it is the main cause.
> > > Besides,
> > > >> > vfork has become outdated since it main usage is supplied by
fork
> > > with
> > > >> > copy-on-write function implemented in modern linux kernel.
> > > Furthermore,
> > > >> > vfork is also not so safe as fork. So I do not think it is the
> > > accepted
> > > >> way
> > > >> > to solve the problem.
> > > >> >
> > > >> >   I will try whether it can be reproduced on drlvm of linux since
> I
> > > am
> > > >> not
> > > >> > sure whether it is relevent to VM or classlib. If any drlvm man
> can
> > > >> tell
> > > >> me
> > > >> > the result, it can avoid my trouble to build it on linux. :)
> > > >> >
> > > >> >
> > > >> >
> > > >> >
> > > >> >
> > > >> >
> > > >> >
> > > >> > --
> > > >> > Leo Li
> > > >> > China Software Development Lab, IBM
> > > >> >
> > > >> >
> > > >>
> > > >>
> ---------------------------------------------------------------------
> > > >> Terms of use : http://incubator.apache.org/harmony/mailing.html
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> harmony-dev-unsubscribe@incubator.apache.org
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> > > >>
> > > >>
> > > >
> > > >
> > >
> > > ---------------------------------------------------------------------
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> > >
> > >
> >
> >
> > --
> > Leo Li
> > China Software Development Lab, IBM
> >
> >
>
> ---------------------------------------------------------------------
> Terms of use : http://incubator.apache.org/harmony/mailing.html
> To unsubscribe, e-mail: harmony-dev-unsubscribe@incubator.apache.org
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>
>


-- 
Leo Li
China Software Development Lab, IBM

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