Yes .. we had the same experience too on Solaris. Native threads performed
much
better than green on a uni processor... Could be that the VM (which has to do
all the
work when using green threads) had some bugs while the OS stuff was much more
time tested and robust.
I also would like to clarify "the separate process" issue when using
native threads... Is that really true and if so is that a Linux only issue
because it
i don't think that is the case when using native threads on Solaris or NT
-- Sree
Bill & Martinah Smith wrote:
> I don't believe this is completely true. When using Java on Solaris, we were
> set up to use green threads because it required a bunch of OS patches to use
> java native threads. We ran into performance issues with green threads when
> we would spin off threads to do background work. We finally decided to make
> the OS patches and ran the same application with native threads and the
> performance improvement with native threads was huge. These were single CPU
> workstations. I'm not completely sure of the reasons, but I speculate that
> it had something to do with thread scheduling. Green threads seemed to
> require the application to yield in the active thread in order for another
> thread (of the same priority) to get a chance to run. This, of course, was
> the Solaris version, not the Linux version. :)
>
> Are you sure about each thread running in it's own process? If so, this is a
> java only thing, because this isn't the case with normal multithreaded
> applications.
>
> > Like my compadres before me said, native threads run at the
> > OS level, and
> > therefore can access multiple cpus. However, it is my
> > understanding that
> > this is the only time native threads should be used. On
> > single processor
> > systems, green threads are faster, and you aren't limited by
> > any process
> > limitations in the OS. Since in native threads, each thread
> > runs in it's
> > own process, you run the risk of running out of available
> > processes. You
> > don't have that with green threads.
> >
> > though I'm sure there are limitations on green threads as
> > well, I don't
> > know whether or not they are definite or limited only by machine
> > capability.
> >
> > On Fri, 30 Jul 1999, Pere Serra wrote:
> >
> > > I have an easy question:
> > > What's the difference between native threads and green theads?
> > > Which one is more eficient/stable?
> > >
> > >
> > >
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