Question

We are using Coldfusion 8 and Jrun is going wild consuming so much memory that we get an error "PermGen space"

Asked by: delrundell

We recently upgraded to Coldfusion 8 because of the freezing up of our server.  Now we seem to be getting more details such as the "PermGen space" error.  When I researched it I learned it was telling me that we were out of memory.  I opened the Task Manager and saw Jrun climbing and was at 806,000k.  I opened services and stopped and started the Coldfusion 8 service.  Jrun's memory usage restarted and now 18 hours later is back to 706,000k.  All my research on the web seems to be about how to solve the problem on earlier versions and I'm not sure how to proceed.  Is there a way in my CFM files to tell Jrun to release the memory?

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Asked On
2007-11-07 at 06:01:44ID22944502
Tags

coldfusion

,

8

,

jrun

,

memory

,

permgen

Topics

ColdFusion Application Server

,

Microsoft IIS Web Server

,

Sun Java System Web Server

Participating Experts
3
Points
500
Comments
6

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Answers

 

by: delrundellPosted on 2007-11-07 at 07:07:26ID: 20232733

We went into the administrator and set all our databases to NOT maintaining the database connection.  The memory seems to be holding for now.  We are watching.  Does anyone know if this is a bad thing to do?

 

by: pmascariPosted on 2007-11-07 at 13:54:28ID: 20236834

My guess is you have a query grabbing an enormous amount of data then trying to process it.  That would drive Jrun to 100% and eat up memory.  Next time it happens, use the new server monitoring tools in CF8 to find out what scripts are running to try to find the offending page.  Also, monitor your DB server to find long running queries.

Setting the server to NOT maintain DB connections is not bad.  But you will incur small (millisecond) delays while CF makes the connection to your DB each time it needs to rather than keeping the connection alive.  This could become a problem under very heavy usage but is otherwise not very noticable.

 

by: matteo69Posted on 2007-11-12 at 07:18:51ID: 20264506

Please,
have anyone news about this issue?
Unfortunately I've the same problem with CF8 EE on a server with 4 CPU and 8 gb RAM

 

by: matteo69Posted on 2007-11-13 at 02:30:35ID: 20270577

hi delrundell,
abspm24 suggest me a possible solution for my issue very similar to your.
please search for:
"java lang OutOfMemoryError: PermGen space on ColdFusion 8"
in EE search

 

by: dealermotivePosted on 2008-04-17 at 19:36:40ID: 21382924

Sometimes Less is more. I was having problems with nightly jobs that were crashing ColdFusion 8. I would watch the memory monitor climb to over a GB of memory before the server hung. My problem was that while I had 2GB of memory on the server and I had allocated 1024MB to the MAX JVM heap, the CF Process would go haywire when trying to use it. I ended up reducing the Maximum to 640MB and my problems went away. The Jobs that were taking over 1GB while running were completing while running at around 200mb max memory.  More isn't always More.

20120131-EE-VQP-002

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