http://docwiki.cisco.com/w/index.php?title=How_to_debug_OutOfMemoryError&feed=atom&action=history 2013-05-26T03:57:00Z Revision history for this page on the wiki MediaWiki 1.16.0 http://docwiki.cisco.com/w/index.php?title=How_to_debug_OutOfMemoryError&diff=34221&oldid=prev 2010-09-24T06:09:36Z

<p>New page: JVM can crash with OOM Error for multiple reasons. * Where to check ** Check in the application logs for OutOfMemoryError Exception in thread “xxx&quot; &#39;&#39;&#39;java.lang.OutOfMemoryError&#39;&#39;&#39;:...</p> <p><b>New page</b></p><div>JVM can crash with OOM Error for multiple reasons. <br /> * Where to check<br /> ** Check in the application logs for OutOfMemoryError<br /> Exception in thread “xxx&quot; '''java.lang.OutOfMemoryError''': Java heap space<br /> * OutOfMemoryError types<br /> ** Java heap space<br /> ** PermGen space<br /> ** Out of swap space<br /> ** unable to create new native thread<br /> ** Requested array size exceeds VM limit<br /> ** GC overhead limit exceeded<br /> <br /> * How to debug different OutOfMemory errors<br /> ** '''Java heap space'''<br /> ** '''GC overhead limit exceeded'''<br /> *** Happens due to a memory leak.<br /> *** Heap dumps are automatically generated at 70/80/90/98% thresholds of the heap size.<br /> **** file name looks like heapDump_MIVR_70%Threshold.hprof.<br /> *** When the application goes OOM, JVM generates a heap dump during the crash.<br /> **** file name looks like java_pid2665.hprof.<br /> **** Due to a bug CSCte90486, this file can be collected only using remote account.<br /> *** Collect the heap dumps (present in the service log directory. i.e. MIVR directory for engine heap dumps).<br /> *** Collect the thread dump present in JVM.log file.<br /> *** Refer [[ How to analyze heap dumps ]] for the procedure to analyze a heap dump.<br /> <br /> ** '''PermGen space'''<br /> *** Happens most probably due to ClassLoader leak.<br /> *** When the application goes OOM, JVM generates a heap dump during the crash.<br /> **** file name looks like java_pid2665.hprof.<br /> **** Due to a bug CSCte90486, this file can be collected only using remote account.<br /> *** Collect the heap dumps.<br /> *** Collect the thread dump present in the JVM.log file.<br /> <br /> ** '''Out of swap space'''<br /> *** Happens due to a memory leak in the JNI code, or in some native applications.<br /> *** System is low on memory.<br /> *** Collect the Perfmon counters of all the services running in the system.<br /> *** Plot a graph of memory usage and find which process is the culprit.<br /> <br /> ** '''unable to create new native thread'''<br /> *** Happens when OS runs out of system resources, or the application has run out of its address space due to excessive threads.<br /> *** Collect the thread dump present in the JVM.log file.<br /> *** Debug the perfmon logs to find the faulty application.<br /> <br /> ** '''Requested array size exceeds VM limit'''<br /> *** Happens due to an application bug or a memory leak.<br /> *** Debug application logs and heap dumps if present.</div>

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