Multiple threads causing lockup

> 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
>

> 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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> 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
>>>
>>
>>
>> --
>> You receive this message as a subscriber of the [hidden email] mailing
>> list.
>> To unsubscribe: mailto:[hidden email]
>> For general help: mailto:[hidden email]?subject=help
>> OW2 mailing lists service home page: http://www.ow2.org/wws
>
>
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>
>