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We're running RedHat Linux 6.1 on a single CPU. We've found that green
threads (Blackdown JDK117_V3) run faster when we compile and run servlets.
But not stable. IBM JDK118 native threads seem to be more stable for us.
G
>-- that green threads tend to be more stable, at least for our applications.
>Ben Ricker wrote:
>
> > I am pitching Jserv against iPlanet tomorrow and I had one more
> > question. iPlanet claims to have multi-processor support built in (I
> > thought the OS handeled that). I wanted to get something clear: what
> > support does Apache/Jserv provide for multip processor machines?
> >
> > I thought I read somewhere that Apache is not multip processor aware. Is
> > this true?
>
>Yes, multiprocessor support on Apache/JServ depends on the OS you're using.
>We use Linux, so that is what I can talk about. In Linux, the granularity of
>load-balancing between processors is a process. That means that, if you have
>some heavy computation going on, better divide it between two or more
>processes, so that the OS can load-balance them.
>
>For JServ: JVMs come in two flavors -- native and green threads. With native
>threads, the scheduling between threads is done by the OS. As for Linux,
>that means, for the most part, different processes (yes, I know the facts
>about threads on Linux, but for comparison purposes we can ignore that
>because the kernel divides the load among threads between the various
>processors). Green threads, on the other hand, use the JVM's scheduler,
>which may or may not provide a more suitable solution. When you use native
>threads, you to worry, for example, about your system's maximum processes
>number. Green threads, on the other hand, tend to slow things down quite a
>bit under heavy load with code that is I/O bound, because the whole JVM
>blocks for I/O instead of a single thread/process. Also, on multiprocessors,
>green threads do you no good unless you have many JServ instances running
>(for example, you can use JServ's load-balancing facilities between
>processors on a single machine when using green threads). That said, we have
>found -- and these are empirical results, no serious research done whatsover
>-- that green threads tend to be more stable, at least for our applications.
>
> > Any information to make these issues clearer would help me.
>
>Hope the above was of any use.
>
> > Ben Ricker
> > Web Administrator
> > US-Rx, Inc.
>
>Ulisses Montenegro
>Systems Administrator/RADIX
>http://www.radix.com.br/
>
>
>
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