Hay anyone any experiences with using green_threads instead of
native_threads ?
Using green_threads should circumvent the thread limit problem I guess.
Ciao,
Tobias
marc fleury wrote:
>
> interesting....
>
> this is really worth a write up in the documentation.
>
> marcf
>
> |-----Original Message-----
> |From: [EMAIL PROTECTED]
> |[mailto:[EMAIL PROTECTED]]On Behalf Of danch
> |Sent: Monday, July 09, 2001 8:11 AM
> |To: [EMAIL PROTECTED]
> |Subject: Re: [JBoss-user] JBoss Best platform/Java implementation
> |
> |
> |Achilleus Mantzios wrote:
> |
> |> I read somewhere in the docs that win 2000 may outperform linux
> |kernel 2.2
> |> even by 2 times when not using apache/jetty for thread mngmnt, because
> |> of the lack of "real" linux threads.
> |> As far as i know this is not the case in kernel 2.4 which supports
> |> kernel-space threads.
> |
> |The issue is deaper than kernel threads. Linux threads are treated by
> |the kernel scheduler exactly the same as processes, and with native
> |threads one Java thread is one kernel thread. This can overload the
> |scheduler on a busier system. In contrast, Solaris and AIX (for example)
> |have thread models where a user thread isn't necessarily a kernel thread
> |- kernel threads are created only when needed, so you can have some
> |number M of user threads (Java threads, in our case) mapped to some
> |smaller number N of kernel threads. Much easier on the kernel scheduler.
> |
> |However, IBM has just released (as a 1.0) a new thread library for Linux
> |that does this M to N mapping. I haven't given it a try yet, but here's
> |the link.
> |
> |
> |http://oss.software.ibm.com/developerworks/projects/pthreads/
> |
> |-danch
> |
> |
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