Rob Lockstone wrote:
> On Mar 21, 2009, at 14:59, Stargazer wrote:
>
>   
>> Adam Allgaier wrote:
>>     
>>> I would plug jconsole into your resin instance and watch what's  
>>> happening to the JVM memory.  Could be loose open threads (and  
>>> large thread size) that grows over time and eats up free memory.   
>>> Restarting would kill all the threads and free the memory.
>>>
>>> http://java.sun.com/j2se/1.5.0/docs/guide/management/jconsole.html
>>>
>>> Adam
>>>
>>>
>>>       
>> Thanks, but as I'd hoped I'd made clear Resin itself shows flat memory
>> use, whether using jconsole, jprofiler, /resin-admin or any of the  
>> other
>> jvmti tools I've used to try to fix this. The memory consumption  
>> occurs
>> outside java.
>>     
>
> I don't know about Ronan's problem, but yours sounds like non-java- 
> heap memory or "native" memory is being exhausted. In my experience,  
> the biggest consumers of that are threads and graphic operations.  
> Depending on the system you're running on, your default stack size  
> could be quite large. Have you tried setting your stack size to a much  
> smaller value via -Xss? Unless you're doing a lot of heavy recursion,  
> the chance that you'll need a large stack is fairly remote. On our  
> (very busy) Windows boxes, we use a stack size of 128K (-Xss128K).  
> Keep in mind that on a 32-bit system (not sure what you're running  
> on), you have only 2G of addressable memory per process. So if you  
> define a larg(ish) java heap, you have only 2G - YourHeapSize to use  
> for allocating memory for threads and other non-java operations, such  
> as some graphics operations.
>
> Rob
>
>   
How come this doesn't happen when I move the non-resin stuff (i.e. the 
PHP apps) to another server? Its Linux Fed 7, dual core, 1G Ram/4G swap.
What I'm really asking is how can you be sure its not mod_caucho? Btw 
there are no graphics operations involved, and the PHP apps are all 
popular packages like Joomla and Pligg, so if these were at fault I'm 
sure the users would be screaming in their forums about it.
>>> ----- Original Message ----
>>> From: Stargazer <starga...@blueyonder.co.uk>
>>> To: General Discussion for the Resin application server 
>>> <resin-interest@caucho.com 
>>>       
>>> Sent: Saturday, March 21, 2009 4:39:56 AM
>>> Subject: Re: [Resin-interest] Perf Issues
>>>
>>> Ronan Lucio wrote:
>>>
>>>       
>>>> Hi,
>>>>
>>>> We have had a perf issue.
>>>>
>>>> Our servers have 4Gb RAM. It has just Resin and Apache installed.
>>>>
>>>> The problem is, when I start Resin, the whole server uses about  
>>>> 2.5 Gb RAM
>>>> After that memory usage keep growing til it reachs the 4Gb RAM,  
>>>> use swap
>>>> and so on.
>>>>
>>>> After few hours the application start getting slow.
>>>> Analyzing the server sources, it's using so low CPU, load about  
>>>> 1... I
>>>> see none overload evidence, except for RAM memory.
>>>>
>>>> So I just restart Resin and/or Apache and application gets fast  
>>>> again,
>>>> but few ours later it will raise the same issue.
>>>>
>>>>
>>>>
>>>>         
>>> I have been suffering from exactly those symptoms for years.
>>> Do your httpd processes consume all the swap, with top showing some  
>>> at
>>> 450Mb? (default httpd.conf values)  I.e does restarting apache alone,
>>> and not resin, cause the swap to drop back down to normal until the  
>>> next
>>> slow growth starts it all again?
>>>
>>> That is my pattern. So when I profile resin theres no unusual growth
>>> even through the whole server is effectiviley dead until restart.  
>>> Given
>>> that, whos to blame? Could mod_caucho somehow be at fault even though
>>> resin itself is ok?
>>>
>>> I have another identical server running a couple of PHP CMS apps, no
>>> resin or java in sight - because of this problem actually. The plan  
>>> is
>>> to move everything over when stable but these have become too  
>>> critical
>>> to play with. Their typical httpd swap use is 25Mb, and its the  
>>> default
>>> httpd.conf. I would dearly love to know what the httpd on the failing
>>> server thinks it needs to hold onto 450Mb for, without tweaking there
>>> could be 20 of these. There are other non-quercus PHP apps running on
>>> that server btw.
>>>
>>> My "solution" is to kill child httpd processes at a far quicker rate
>>> than you'd normally want, and it works of sorts:
>>>
>>> <IfModule prefork.c>
>>> StartServers       8
>>> MinSpareServers    5
>>> MaxSpareServers   20
>>> ServerLimit      256
>>> MaxClients       256
>>> MaxRequestsPerChild  96
>>> </IfModule>
>>>
>>> <IfModule worker.c>
>>> StartServers         2
>>> MaxClients         150
>>> MinSpareThreads     25
>>> MaxSpareThreads     75
>>> ThreadsPerChild     25
>>> MaxRequestsPerChild  96
>>> </IfModule>
>>>
>>>       
>>>> This problem usually happens on peaks hours.
>>>>
>>>> So we upgraded RAM memory to 8Gb with a PAE kernel.
>>>> Although it doesn't reach the 8G RAM, slow moments gots for  
>>>> frequent. It
>>>> seems to work worse that way (8Gb + PAE kernel).
>>>>
>>>> The question is:
>>>> Is there everyone having the same issue with Resin (3.1.6)?
>>>> My doubt if such problem resides either on Resin or on my  
>>>> application.
>>>>
>>>>
>>>>
>>>>         
>>> All versions prior to 3.1.6, and currently with 3.2.1 Pro
>>>
>>>       
>>>> Thanks,
>>>> Ronan
>>>>
>>>>
>>>>
>>>> _______________________________________________
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>>>>
>>>>         
>>>
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