Hi Scott,
I've done another round of testing using b26 and again this issue is still
evident. As soon as I use JDK 6 my TPS goes down to < 1ps, under
JDK5 I'm getting ~3ps. I even tried hitting GF directly on port 8080,
which made no difference.
To further my testing, I kept JDK 6 and recompiled using sourcelevel
of 1.5 - no difference.
I then swapped to JDK 5 and restarted the server and ran my tests
and I'm immediately getting 3tps range again.
I must stress the only thing I'm changing is the JDK, the code of the
application isn't being touched at all. It's the same WAR always.
Something is wrong....anything else I could try?
-=david=-
sdo wrote:
>
> Hi David --
>
> We do performance testing of the various JDK versions as well. In fact,
> last week Sun posted new results on the SPECjAppServer 2004 benchmark
> using GF 9.0 UR 1 and JDK 6. You can't actually tell directly from the
> result, but in our testing using JDK 6 improved our score on that
> benchmark by about 6-7% (which is of course why we submitted the results
> on JDK 6).
>
> You shouldn't actually need to recompile your application. However, if
> recompilation were an issue, it would have shown up in the Jetty test as
> well, so I mention this just to save you some trouble in the future.
>
> I suppose it could be some issue with the AJP connector, which is
> something we don't use in any of our performance tests. Do you see the
> same issue if you access the appserver directly instead of going through
> apache?
>
> -Scott
>
> On Tue, 2006-11-28 at 10:18, David Harrigan wrote:
>> Hi Everyone,
>>
>> GF v2 b25.
>>
>> I've come across another performance issue, this time it manifests when I
>> switch JDK. I've got the same machine and same setup as before, but this
>> time I'm switching JDK's (since we hope to go to JDK6 Q1 2007). Anyway,
>> I've
>> performed the same load testing that I have always been doing and I'm
>> getting some interesting (and worrying!) results.
>>
>> I'm testing this against JDK 1.5.0_09 and JDK 1.6 rc b104. Before each
>> switch I rm -rf the domains directory and I run ant -f setup.xml to
>> recreate. Then I add 3 jvm-options to the domain.xml
>>
>> com.sun.enterprise.web.connector.enableJK=8009
>> com.sun.enterprise.server.ss.ASQuickStartup=false
>> isContainer=true <-- this is an option for my application and not for GF.
>>
>> The application is rebuild each time, using the standarised build.xml
>> that
>> we here are using, but I'm switching source level to 1.6 when I switch
>> JDK
>> to version 1.6 (I put the source level to 1.5 when I switch back to JDK
>> 1.5).
>>
>> I again get a dramatic slowdown running JDK 1.6. My average TPS is about
>> 1.5-2, whereas in JDK 1.5 I'm hitting nearer 16tps.
>>
>> I thought, hmm, could be a JDK issue, so I deployed the same app in Jetty
>> and then JRun and the TPS under JDK 1.6. is up around 16, just like
>> running
>> under JDK 1.5. (For completeness, I rebuild to source level 1.5 and ran
>> with
>> JDK 1.5 and the tps is again around 16).
>>
>> So, the only thing changing is the app server, i.e., GF ;)
>>
>> (oh, and I have no system.out's coming out :-) see passim for details on
>> that one...)
>>
>> Has anyone else tested the same app between JDK versions? It could very
>> well
>> be a GF issue however.
>>
>> -=david=-
>>
>> --
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