Use these fields to specify the number of Barrier Synchronization Register (BSR) arrays you want to assign to this partition profile.
The BSR is a memory register that is located on certain processors. A parallel-processing application can use a BSR to perform barrier synchronization, which is a method for synchronizing the threads in the parallel-processing application.
On logically partitioned systems, BSRs are divided into arrays. You can assign BSR arrays to partition profiles. Each BSR array is eight bytes long. The number of BSR arrays that are available on a managed system depends on the number and type of processors used on the server model. Available BSR arrays displays the number of BSR arrays that have not yet been assigned to partition profiles on the managed system.
You can assign BSR arrays only to logical partitions that use dedicated processors. Also, not all operating system versions supports use of the BSR. For information on whether your operating system supports use of the BSR, consult your operating system documentation.