Heap pools modes of operation

You can use the HEAPPOOLS64 option in two modes:

ON: This mode is selected by specifying the runtime option HEAPPOOLS64(ON). In this mode, cells can be any size between 8 and 64K that is a multiple of 8. This mode avoids contention during storage allocation and release. This mode uses less storage.
ALIGN: This mode is selected by specifying HEAPPOOLS64(ALIGN). In addition to avoiding contention during storage allocation and release, the goal of this mode is to reduce cache contention when two adjacent cells are being updated at the same time. Only multi-threaded applications will gain additional benefits from using ALIGN mode instead of ON mode. This mode uses more storage.

You can use the HEAPPOOLS option in two modes:

ON: This mode is selected by specifying the runtime option HEAPPOOLS(ON). This mode avoids contention during storage allocation and release. This mode uses less storage.
ALIGN: This mode is selected by specifying HEAPPOOLS(ALIGN). In addition to avoiding contention during storage allocation and release, the goal of this mode is to reduce cache contention when two adjacent cells are being updated at the same time. Only multi-threaded applications will gain additional benefits from using ALIGN mode instead of ON mode. This mode uses more storage.