Urgent-Java webservers on iSeries and other platforms 2004-01-20 - By Pete Stokes
Back
The app is really a basic war file - it uses JTOpen to connect to
iSeries. Nothing fancy, a few patterns used, no EJBs etc.
Production was rushed onto Tomcat 5.0.16 on a standard Dell desktop with
1gig RAM running SuSE 9, load tested to 150 users. It flies! Page to
page times (DB everytime) are incrediblely fast, basically instant even
under 150 user load test.
On the iSeries, we get over (live objects) 2million Vector object,
2million PCMLDocuments, and a whole host of other big figures. I used
JProfiler on the app (Tomcat) and we get nothing like that. IBM seem now
to say that we need to *dedicate* 2 processors, 4-6gig of RAM to
continue to test the app on an iSeries (820). We are also totally
patched up on the iSeries.
Interesting figure is that when the iSeries/WebSphere hangs, we shut off
the load test and it recovers after 20-30mins with a collected object gc
figure of 25million+ compared to a normal 5million. The gc cycles also
intermingle. GC cycle 19 starts, and GC 20 then starts before 19 has
finished.
I have collected loads of info - if you need anything else give me a shout.
Regards,
Pete.
Peter Lin wrote:
>
>That sounds a bit odd to me. A well designed webapp or ejb shouldn't have
horrible performance for 10 concurrent users. If you're using stateful EJB's
you may want to profile it first. Without knowledge of what the app does, my
first guess is something in the app is eating up all the CPU and memory.
>
>If the app has been profiled aggressively and you know it's not the app itself
, i would say install the app on JBoss and compare the performance. If you have
hard numbers with the same app, it is much easier to get people to listen.
>
>you can also d/l weblogic and see how it performs. keep in mind weblogic has a
limit of 10 concurrent connections, so if you need to load test with more than
10 connections, you'll have to smooze the BEA sales guys. You should be able to
get them to give you a temporary one month license with unlimited connections,
since they are trying to win customers from IBM.
>
>there are several old benchmarks comparing various servlet containers, which
may or may not help. If you use ejb, those results won't do much for you. if
you provide more details, you'll get better help :)
>
>peter lin
>
>
>
>
>
>Peter Stokes <stokesp@(protected)> wrote:
>Hi,
>
>I'm on a site where a third party application has been put on WebSphere 4.0.5
on an iSeries 820/V5R2. We have had horrendous performance / stability problems
even with 10 users and even IBM cannot seem to help.
>
>Production is currently sitting pretty on a rushed install of SuSE 9 on a Dell
desktop with 1gig RAM and Tomcat.
>
>What I am after is opinions / a comparason someone has done (weblink?) / docco
about Java webservers performance looking at iSeries, Intel, Sparcs etc. They
are into the iSeries/WebSphere 4.0.5 mindset, but no one can answer why this
was the recommended setup and they seem to be fixed on this route, but no-one
can make it work!
>
>There is nothing else on WebSphere other than this app, so if I can get some
info, I then actually have some stats / papers to help recommendations, if IBM
cannot fix this in the next couple of days (they've had level 1 guys on it for
6 weeks).
>
>Anything would be a great help.
>
>Pete.
>
>
>
>
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