PSALLOC and NODISCLAIM (AIX only)

IBM® AIX® implements, by default, a late page allocation policy. When you start a JVM with a large heap, AIX does not guarantee that there is sufficient page space to back the heap.

AIX only allocates space on the page device when you use the heap. In some cases, AIX may have to kill JVMs when it is low on free space on the page devices.

To prevent this, we recommend setting the following environment variables prior to starting the JVM:

   PSALLOC=EARLY
   NODISCLAIM=TRUE

Please see Page space allocation policy for more information.