PE 3.2 now fully supports both 64 and 32 bit threaded applications. Refer to the threaded POE compiler script descriptions, such as mpcc_r for more details. Non-threaded applications still must run as 32 bit applications.
There are some potential migration issues for application developers compiling 64 bit programs. For more information, refer to the IBM Parallel Environment for AIX: Operation and Use, Volume 1.