Orbeon Forms community mailing list

Re: Re: Multiple threads causing lockup

Posted by Alessandro Vernet on Jan 20, 2010; 4:14am
URL: https://discuss.orbeon.com/Multiple-threads-causing-lockup-tp1011864p1018143.html

Leon,

These problems are hard to debug through the mailing list. In short:
this should not happen, and performance should not degrade in the way
you describe. But yes, we have already seen things like this, and they
are in general due either to an issue in your application, to a bug or
something sub-optimal in Orbeon Forms (which we fix when we find it!),
or a configuration issue. When it comes to configuration, see:

http://wiki.orbeon.com/forms/doc/developer-guide/performance-tuning#TOC-Reduce-the-number-of-concurrent-pro

Unfortunately, you can't configure Tomcat with maxThreads="3", but you
can do it with a front-end server. Just for the sake of testing this,
could you limit the number of concurrent thread in JMeter to 3? How do
things work out when you do that?

Alex

On Jan 11, 2010, at 10:23 PM, lmika <[hidden email]> wrote:

> Sorry, I should mention that we are using Orbeon 3.7.1
>
> Thanks,
>
> Leon
>
>
> On Tue, 2010-01-12 at 17:20 +1100, lmika wrote:
>> Hi,
>>
>> While using JMeter to load test our application, which is deployed
>> separately from the Orbeon War in the same Tomcat, we have noticed
>> that
>> when about 25 JMeter threads are requesting an XForm to be
>> rendered, it
>> takes a number of seconds (around 30 or 40) for the request to be
>> handled. We have also found that over time, Orbeon stops handling
>> these
>> requests and they time out.
>>
>> We have tried increasing the maximum heap size for Java to about 1 Gb
>> and reduced the "maxThreads" in Tomcat to about 10.
>>
>> Has anyone experienced this before? If so, do you have any
>> suggestions
>> on where we can look or what we can change to fix the problem?
>>
>> The specs of our platform are:
>>
>> OS: OpenSuse 11.0 kernal 2.6.25 i686
>> Java: jdk1.6.0_16 i386
>> Tomcat 6.0 (executed as a server in Eclipse Galileo)
>>
>> Thanks in advanced,
>>
>> Leon
>>
>
>
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