See my immediately prior post on the subject of native thread support in
Linux. The short answer is that it is present -- and the referenced jBoss
documentation already wrong -- as of kernel 2.2 and Sun JVM 1.3.
The Linux 2.4 kernel makes substantial internal changes to the scheduler,
especially with regard to SMP, but this is transparent to applications
such as jBoss. (The exception to transparency is that threading errors,
such as failure to synchronize properly, may be exposed by a 2.4 kernel if
the same code was working by coincidence on a 2.2 kernel.)
>From the perspective of a Java application, the 2.4 kernel should be
regarded as architecturally equivalent to a 2.2 kernel, although there
would likely be significant performance benefits, especially with SMP.
-- Mike
On 2001-06-24 at 11:25 +0100, Julian Gosnell wrote:
> Further context to this quote suggests that Linux 2.2 is being
> discussed.
>
> Firstly, can anyone confirm this from a reliable source - it's the
> first I've heard of it.
>
> Secondly, is this still the case with a 2.4 kernel, in which I thought
> similar issues had been very successfully addressed ?
>
> Thirdly, It would be useful to have dates on documentation, so that it
> is possible to tell when they become stale - if 2.4 does address this
> (I have no idea), or a better Linux JVM has since been released, then
> it would be helpful to know when this statement was made.
>
> Jules
>
>
>
> Fei Wang wrote:
>
> > I have found the following at
> > http://www.jboss.org/documentation/HTML/ch10s02.html.
> >
> > Linux users probably already know that linux does not support real
> > threads. Under heavy load, JBoss will for example crash with 200
> > concurrent users under linux, whereas it can handle 1000 of them on
> > the same box with Windows 2000. Of course, if you use Apache or Jetty
> > in front of JBoss to handle the thread pooling, this will not be a
> > problem.
> >
> > So if it is ture, I think that Apache should be a reasonable front
> > part, especially for production use.
> >
> > Fei Wang
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