Derek Glidden wrote:
>
> > Dan Iuster wrote:
> >
> > I would like to know if there is a different version of the JVM
> > compiled for multiprocessor Linux systems than for uniprocessor.
> >
> > Has anybody experienced any problems or performance issues with using
> > the uniprocessor version on multiprocessor systems ?
>
> I'm curious about this as well. I've been playing around with the JDK
> 1.2-pre2 on my spanking new Dual-PII machine recently to see how well it
> handles SMP and I've noticed that with either native or green threads,
> it only seems to use a single CPU for running Java apps. I've noticed
> this same behaviour in 1.1.7v3, so I'm not 100% sure I'm not just doing
> something wrong like not setting some env var to tell the JDK to use
> multi CPUs.
A look at the process list shows that the native-threads version is
definitely creating multiple threads. (Linux threads get their own
process table entries; if you don't see multiple ps entries, you're
either running green threads or have some degenerate libpthreads that
implements the API in user space.)
I would think, given the clear presence of multiple threads, that
assignment to CPUs is out of the JVM's hands. Assuming you really do
have multiple threads concurrently consuming CPU time, failure to engage
multiple CPUs sounds like something broken in the OS. Obvious dumb
question: you are running the SMP kernel, yes?
Nathan
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