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From "Rana Dasgupta" <rdasg...@gmail.com>
Subject Re: [drlvm][threading] taking a closer look at Harmony-2803 (stress.Mix hangs on rhel4)
Date Fri, 05 Jan 2007 22:47:45 GMT
Weldon,
    What I reported earlier were the results with stress.Mix with
selectThreadType returning "spawn" only.
    With the MegaSpawn test:

   On a 2 cpu XP box:
    - RI passes
   - DRLVM fails with OOME when creating new threads and hangs

 On a 2 cpu RHEL4 box
  - DRLVM fails with OOME when creating new threads and hangs
 -  RI also occassionally fails with OOME when creating new threads, but
sometimes passes.


  OOME is a resource exhaustion error, and it seems that it can happen with
both RI and DRLVM if we do uncontrolled creation. Do you think that we
should treat it as a bug? Maybe we should lower the thresholds to let the
test pass.

Rana



On 1/5/07, Rana Dasgupta <rdasgupt@gmail.com> wrote:
>
> HI Weldon,
>    On a 2 cpu smp RHEL4 box:
>      - on RI the modified test always passes
>      - DRLVM always fails with OOME when trying to spawn threads
>
>   On a 2 cpu XP box:
>     - RI kills the "occupy" thread( I thought this is really smart ), but
> passes
>    - DRLVM sometimes passes, sometimes hangs, occassionally reports
> invalid memory references, VM launcher errors etc. etc.
>
>
> Rana
>
>  On 1/5/07, Weldon Washburn <weldonwjw@gmail.com> wrote:
> >
> > All,
> >
> > An update.  I think I can cause the bug(s) we are discussing in this
> > email
> > chain to surface 100% of the time on 2 cpu rhel4.  Hacking stress.Mixsuch
> > that it only runs the "spawn" method seems to do it.   This hack always
> > fails on 2 cpu rhel4 and never fails on 1 cpu winxp.  It would be
> > interesting to try on 1 cpu rhel4 and 2 cpu winxp.  If anyone has this
> > combination, please try it.  This would tell us if the bug is sensitive
> > to
> > OS.
> >
> > When I run the below patch on RI, it completes successfully every time.
> > Curiously it looks like the RI kills the "occupy" thread.  It prints on
> > the
> > console output, "occupy terminated by java.lang.OutOfMemoryError...".  But
> > I
> > don't see occupy terminate when running drlvm.  I will run more
> > tests.  This
> > may actually be compounding the problems we are seeing.
> >
> > Naveen, Rana,
> > Can you try the below patch on your hardware to see if you can reproduce
> > what I describe above?  Does the output look the same as Harmony-2803?
> >
> >
> > Below is an svn diff that makes the hard failure happen on 2 cpu rhel4:
> >
> > Index: Mix.java
> > ===================================================================
> > --- Mix.java    (revision 491852)
> > +++ Mix.java    (working copy)
> > @@ -93,6 +93,8 @@
> >
> >     static Random random = new Random(0);
> >     static String selectThreadType(int i) {
> > +               return "spawn";
> > +               /*
> >         switch (i % 9) {
> >             case 0: return "uncontended";
> >             case 1: return "contended";
> > @@ -105,6 +107,7 @@
> >             case 8: return "exceptions";
> >         }
> >         return "nothing";
> > +               */
> >     }
> >
> >     static int thread_number = 60;
> >
> >
> >
> > On 1/4/07, Naveen Neelakantam < neelakan@uiuc.edu> wrote:
> > >
> > >
> > > On Jan 4, 2007, at 4:28 PM, Weldon Washburn wrote:
> > >
> > > > I see it hang consistently when running automated mode (build
> > > > test).  I have
> > > > seen it hang once when running manually from a linux terminal
> > > > window.  It
> > > > actually printed out "PASSED" then hung.  This leads me to suspect
> > > > there
> > > > might be problems with how System.out.flush() is working when there
> > > > are
> > > > multiple threads running on SMP.  Are you running on an SMP box?
> > > > Can you
> > > > give me the exact command line you are using?  I would like to try
> > > > it on my
> > > > box.
> > >
> > > Ok, cool.  I was seeing the exact same behavior (i.e. the test prints
> > > PASSED and then hangs).  So it sounds like you are on the right
> > > track, to me anyway.
> > >
> > > But to answer your questions: I am running RHEL4 update 4 on a core2
> > > duo.  The command line I am using is "java -cp . stress.Mix" (with my
> > > path and JAVA_HOME set appropriately).
> > >
> > > Naveen
> > >
> >
> >
> >
> > --
> > Weldon Washburn
> > Intel Enterprise Solutions Software Division
> >
> >
>

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