Uncontrolled Memory usage in webcenter application.

I have a webcenter application which I use as Consumer Application. This application contains 30 Portlets registered using portlet producers.
All these portlets are again webcenter applications portletized using the Portlet Faces Bridge.
I deploy this consumer application on one of the OC4J containers in application server.
Also, the 30 producers are deployed in another OC4J Container in the same application server.
When I start accessing my consumer application and the page containing any portlet, the heap size of that container starts increasing till it reaches maximum level and then finally hangs up. Also, this heap size does not come down and I am not able to fulfill any further requests.
The container and application logs suggest java.lang.OutOfMemory Error . Heap Space.
Also, the heap size of producer containers is under control. I am not able to understand how to control / release this heap memory.
When I run a minimized version of this consumer application ( having 5 - 10 portlet producers registered) It works pretty fine.
So I think when the number of portlet producer registrations increase, there is this memory leak.
Is there a limit to the number of portlet producers that can be registered in a webcenter consumer application? How can I find out where exactly is the memory leak? How do I bring down the heap size once processing is finished?

Hi vsharma2,
Thanks a lot for your reply.
we have tried all the things mentioned by you. We have also increased the physical memory to the extent we could.
But my main concern is that the memory does not get released. We cannot increase memory to very high levels. It has to stop somewhere.
If we could get a solution whereby we understand how to release the memory consumed by the portlet producers once they have been used, it could solve the problem. Unfortunately, we haven't got any solution in this direction. Also, we have done code optimization, closed everything (whatever we can) in finally block and increased the container Heap size also.
Hope we get something to release the memory consumed by portlets or portlet producers.
Anyway, thanks a lot for your directions.
Regards,
Kunal

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Calculate
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Erase id
Erase Price
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Is there a possibility to clean everything in:
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End Sub
Thanks in advance
Mark

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A detailed look at memory usage in OS X
Understanding top output in the Terminal
The amount of available RAM for applications is the sum of Free RAM and Inactive RAM. This will change as applications are opened and closed or change from active to inactive status. The Swap figure represents an estimate of the total amount of swap space required for VM if used, but does not necessarily indicate the actual size of the existing swap file. If you are really in need of more RAM that would be indicated by how frequently the system uses VM. If you open the Terminal and run the top command at the prompt you will find information reported on Pageins () and Pageouts (). Pageouts () is the important figure. If the value in the parentheses is 0 (zero) then OS X is not making instantaneous use of VM which means you have adequate physical RAM for the system with the applications you have loaded. If the figure in parentheses is running positive and your hard drive is constantly being used (thrashing) then you need more physical RAM.

Having a problem with Excessive "modified" memory usage in Win7 x64, upwards of 3.6GB, any suggestions?

I have 6GB of ram, a fresh install of Windows 7 x64, and the screenshot shows what happens after leaving my PC on for a couple days. (3782+MB being used by modified memory ATM).
http://wow.deconstruct.me/images/ExcessiveMemory.jpg
Any ideas on this?
Edit:
Added this after first round of suggestions
http://wow.deconstruct.me/images/NotSoExcessiveMemory.jpg
This is uptime of around 2 hours.
The first image is of uptime of around 3-5 days.

Matthew,
The only reason why these pages are kept on the modified list indefinitely is because the system doesn't have any available pagefile space left. If you increase the size of the pagefile the system will write most of these pages to disk and then move them from the modified list to the standby list. Standby pages are considered part of "available memory", because they can be reused for some other purpose if necessary.
Whether this would "fix" the problem or not depends on what the actual problem is. If it's an unbound memory leak then increasing the size of the pagefile will simply allow the system to run longer before it eventually hits the maximum pagefile size limit, or runs out of disk space. On the other hand, if it's a case of some application allocating a lot of memory and not using it for a long time, then increasing the pagefile might be a perfectly valid solution.
Allowing the system to manage the size of the pagefile actually works well in most cases. Pagefile fragmentation (at the filesystem level) can only occur when the initially chosen size is not large enough and the system has to extend it at run time. For win7 we have telemetry data that shows that even for systems with 1 GB of RAM, less than 0.1% of all boot sessions end up having to extend the pagefile, and this number is even lower for larger amounts of RAM. If you think you are in that 0.1% and your pagefile might be getting fragmented, you can manually increase its minimum size such that the total system commit charge stays below 80% even if you run all your apps at once (80% is the threshold at which the pagefile is automatically extended). This will make sure the pagefile is created once and then stays at the same size forever, so it can't fragment. The maximum size can either be set to the same value as the minimum, or you can make it larger so that the system is more resilient to memory leaks or unexpectedly high loads.
By the way, Windows doesn't use pagefiles as "extra memory", it uses them as a backing store for private pages, just like regular files are used as a backing store for EXEs/DLLs and memory mapped files. So if the system really has more than enough RAM (like in your second screenshot, where you have 3.6 GB of free pages) you shouldn't see any reads from the pagefile. You can verify this by going to the Disk tab in the resource monitor and looking for any disk IO from pagefile.sys. On smaller systems that don't have an excess of free pages you may see periodic reads from the pagefile, and this is expected because the total amount of data referenced by the OS/drivers/processes is larger than the total RAM. Forcefully keeping all pagefile-backed pages in memory (which is what disabling the pagefile does) would simply mean some other pages (memory mapped files, DLL code or data etc) would have to be paged out.
Regarding further troubleshooting steps: If the system runs fine with a larger pagefile (commit charge stabilizes well below 80%, and you no longer see gigabytes of modified pages accumulating in memory) then you don't really need to do anything. If the problem persists, you can check for any processes with an abnormally high commit charge, and also check kernel memory usage in task manager. If it's a kernel leak you can usually narrow it down to a particular driver using poolmon.exe or kernel debugger.

Problem with memory usage and CPU usage

Hello,
i have a problem with the memory usage and cpu usage in my project!
My application must run for more than 24 hrs. The problem is that the longer it runs the bigger is the memory and cpu usage!
It starts with ~15% CPU usage and ~70 MBytes memory usage. After ~ 24hrs the CPU usage is ~60% and the memory usage is ~170 MBytes!
After 3 days the CPU usage is almost about 70% and the memory usage is about 360 MBytes!
What can I do to reduce this huge recource usage?
Thank you!

Hi Pahe,
   I think the issue is memory usage, since CPU usage can increase due to greater memory requirements.
   Anyway, it's difficult to debug without seeing your code, can you post it (possibly for LV 7.1 compatibility)? Or just post a JPEG of the piece of code that can give problems...
   I guess you're appending data to an array instead of replace data elements, but I can't be sure...
   Have a nice day!
graziano

Uncontrolled Memory usage in webcenter application.

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