Wls815/AIX: Java Core And Out Of Memory Due to Fragment

(Doc ID 792960.1)

Last updated on MAY 24, 2017

Applies to:

Oracle WebLogic Server - Version 8.1 and later
IBM AIX on POWER Systems (64-bit)
z*OBSOLETE: IBM AIX5L Based Systems (32-bit)
IBM AIX Based Systems (64-bit)IBM AIX5L Based Systems (32-bit)


Get OutOfMemory error even there are a lot of free spaces in JVM heap when using IBM JDK on AIX. We can see it from java core file looks like:


1STHEAPFREE Bytes of Heap Space Free: 43069110
1STHEAPALLOC Bytes of Heap Space Allocated: 7ffffa00

gc trace appear:

<AF[5007]: Allocation Failure. need 19660808 bytes, 233 ms since last AF>
<AF[5008]: Allocation Failure. need 16155496 bytes, 388 ms since last AF>


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