David Marshall wrote:
>
> Michael Thome wrote:
>
> > I've been unable to get blackdown native-thread VM implementation to
> >
> > work properly on my x86-based SMP machine. I'd be interested in
> > corresponding with anyone who's had better luck.
> >
> > Essentially the problem is that code like:
> > synchronized (lock) {
> > lock.wait();
> > }
> > results in exceptions like:
> > java.lang.IllegalMonitorStateException: current thread not owner
> > at java.lang.Object.wait(Native Method)
> > at java.lang.Object.wait(Object.java, Compiled Code)
> > ...
> >
> > I see it happening in my code, in jdk code (e.g. rmiregistry) and in
> >
> > third-party code. I have a short example which makes the bogon
> > trivially reproducable.
> >
> > I haven't had any problems on single-cpu machines, though I run a
> > different kernel on those machines.
> >
> > I'm mostly using Blackdown 1.2.2RC4 with javacomp (though jit
> > doesn't
> > seem to matter). IBM JDK1.3 beta exhibits almost identical
> > behavior.
> > The "Sun" 1.3 beta with hotspot actually doesn't throw these
> > exceptions - it silently hangs instead.
> >
> > BTW - I'm using a 2-cpu intel machine w/ various late-2.3-series
> > kernels and glibc 2.1.3.
>
> I've had similar experiences, though on a 2.2.12 kernel.
> I get the dumps when using either javacomp or sunwjit (Blackdown
> 1.2.2RC4) - maybe after minutes, maybe after hours.
>
> I have been able to run long-term high-volume tests (48 hours,
> constant hammering, max-throughput testing) without problems when
> running with no jit at all - that's the only configuration in which
> I've had consistent repeatable results.
>
> Haven't done any 1.3 SMP testing yet.
What about tya?
We're considering buying a dual processor machine to run our java
programs but if we can't get something running with a jdk on an smp
kernel there probably won't be much point.
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