RE: AS 400 & ejbs -- JAVA400-L

Java on 4000 is predominantly CPU bound. Model 270 with CPW of 150 is #2248
which is 7 times slower than 270#2252. Of course, you can't use CPW as a
relative measure of response time, but what's important is the fact that
#2252 is just 450Mhz.

So, Java being 5 times slower on 270#2245 than it is on a 700Mhz PC is
hardly surprising. I'm really curious how #2225 would compare with the same
PC in that respect.

Lo

> -----Original Message-----
> From: Timur Evdokimov [mailto:timur@jacum.com]
> Sent: 04 November 2002 07:09
> To: java400-l@midrange.com
> Subject: RE: AS 400 & ejbs
>
>
>
> Hi,
>
> We've managed to run JBoss at AS/400, after a couple of tweaks and
> nearly a man-week spent on this.
>
> There were some nullpointer exceptions and a lot of other
> nasty things.
> E.g. deleteOnExit() function threw some vague native code exception.
> Or AS/400 JVM doesn't accept jars compiled by javac, only by jikes.
> Or something else.
>
> Finally, yes, it runs. It takes about 20 minutes to start (model 270
> with 150 CPW and Java optimization level 30) but who cares.
>
> The major problem is runtime performance. A modest P-III 733 MHz
> outperforms our model 270 at least 5 times (and up to 20 times) on our
> load stress simulations, which mostly make use of JBoss MQ and data
> queues through JT400.
>
> We haven't considered Websphere and/or Weblogic because of customer's
> budget constraint, so I can't give any advices here.
>
> Generally, AS/400 doesn't seem to run Java applications in efficient
> way.
> I don't know - is it bad JVM implementation, AS/400
> architecture flaw...
> or maybe just IBM marketing trick :)
>
> If performance is an issue and you can't afford that many
> CPWs for your
> application, I would recommend to run J2EE application on separate
> machine (Intel, HP, Sun, whatever Java-friendly) and use
> AS/400 toolbox
> API to access all AS/400 services. Also AS/400 Integrated Netfinity
> Server may be well an option.
>
> Otherwise, if for any reason you do want your J2EE on AS/400,
> I strongly
> suggest to do some preliminary performance tests first with whatever
> J2EE server you choose.
>
> Regards,
> Timur
>
> > -----Original Message-----
> > From: java400-l-admin@midrange.com
> > [mailto:java400-l-admin@midrange.com] On Behalf Of Stefan Groschupf
> > Sent: Sunday, November 03, 2002 8:30 PM
> > To: java400-l@midrange.com
> > Subject: AS 400 & ejbs
> >
> >
> > Hi,
> >
> > I'm a newbie in the as 400 and java issue. We have a je22
> > application and our customer is interested in running this on
> > a as 400. Some one has experience running a ejb application
> > server like websphere, weblogic or jboss on a as 400 ?
> >
> > Thanks for any hints
> > Stefan
> >
> >
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>
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