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Upen1
Upen1
Inspiring
May 21, 2012
Question

Heap out of Memory Issue

  • May 21, 2012
  • 1 reply
  • 5508 views

Hi, I am using cfthread in my application and the cfthread uses one java library to download data from different servers. Generally we download 50-60MB data or 50,000 - 60,000 images in small batches by looping.

Most of the times I facing the issue out of memory for heap.

Below is my JVM settings.

java.args=-Duser.timezone=America/Chicago -server -Xmx2048m -Xms2048m -Dsun.io.useCanonCaches=false -XX:MaxPermSize=256m -XX:PermSize=256m -XX:+UseParallelGC -Dsun.rmi.dgc.client.gcInterval=600000 -Dcoldfusion.fckupload=true -Dsun.rmi.dgc.server.gcInterval=600000 -Xbatch -Dcoldfusion.rootDir={application.home}/ -Djava.security.policy={application.home}/servers/cfusion/cfusion-ear/cfusion-war/WEB-INF/cfusion/lib/coldfusion.policy -Djava.security.auth.policy={application.home}/servers/cfusion/cfusion-ear/cfusion-war/WEB-INF/cfusion/lib/neo_jaas.policy

Can any one please suggest where do I make any JVM related changes for optimize use of heap memory?

Or How can I able to detect whether any other issue(memory leak) is there in my application?

    This topic has been closed for replies.

    1 reply

    C
    carl type3
    Legend
    May 21, 2012

    Best to get an idea of what the CF JVM is doing. Can do that many ways via JVM logging , JDK tools jconsole and jvisualvm , others CF Monitor (CF8 9 10), CF Server Manager (CF9 10) both in a limited way, CF Jrun metric (CF7 8 9) CF  tomcat metrics (CF10) and perhaps FR and seeFusion have some tools. I think in your case JVM logging would be best to analyse what is happening then knowing what is occurring in CF JVM apply a change and monitor again. How to enable JVM logging and tools to help with reading or understand the log latter.

    Some Questions:

    CF version (suspect 9.0.n but you do not say) and Edition?

    Java version that CF is using eg 1.6.0_24?

    RAM available?

    Operating System and CF and Java are 64 bit?

    Probably no bearing Windows Linux? IIS Apache?

    Sample of log error message that shows the heap has problem?

    JVM logging:

    Add these without return line feeds to your JVM args. Copy or backup your JVM.CONFIG before applying change. CF needs to restart to apply changes.

    -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintHeapAtGC -verbose:gc -Xloggc:cfjvmGC.log

    Creates a log file in ColdFusion\runtime\bin\cfjvmgc.log

    Jrun4\bin\ in case multiserver

    Use GCViewer tool to graphically examine the "cfjvmgc.log" contents:

    http://www.tagtraum.com/gcviewer.html

    Would not like to suggest a change to make without some details on the actual error and a look at the JVM logs.

    Once have some details then there are some things that come to mind:

    -Setting initial size same as maximum can lead to a fragmented heap tho might be ok

    -Could be non heap memory value that is filling eg Perm or Code Cache

    -Set New gen value (eg -Xmn184m) so JVM does not make poor guess on size

    -Garbage Collect every 10 minutes OK, so you are trying to keep heap evacuated for now

    -Could try a different GC routine other than UseParallelGC

    HTH, Carl.

    C
    carl type3
    Legend
    May 23, 2012

    Amendments and addition to earlier post that apply to CF10.

    JVM log file "cfjvmgc.log" will be in ColdFusion10\cfusion\bin or ColdFusion10\"instance"\bin case Enterprise Manager > Instance Manager > added new instance.

    This ServerStats could help resolve JVM heap issues. No need to restart CF10 to apply JVM logging or JDK style Jconsole tools  to get a look at memory heap and CPU usage. Ref:

    http://blogs.coldfusion.com/post.cfm/cfb-extension-for-server-stats-using-websocket

    EG

    Hope that’s helpful for readers, Carl.

    Upen1
    Upen1Author
    Inspiring
    May 23, 2012

    Hi carl type3,

    I have updated my JVM from version 1.6.0_17 to 1.6.0_24. After updating the JVM there no "Heap Out of Memory Issue" from 2 days. But, it seems all my long running requests are getting timed out either in CFLOOP or in CFQUERY though I have set a high timed out value for page request and CFQUERY.

    In my local development environment the pages working fine without timeout request, but giving time out error in staging server.

    Following is my Server Configuration:

    ColdFusion Version: 9,0,1,274733

    Edition: Enterprise 

    Operating System: Windows Server 2008 R2

    Adobe Driver Version: 4.0 (Build 0005)

    Java VM Name: Java HotSpot(TM) 64-Bit Server VM

    Thanks

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