Paging space allocation policies
The PSALLOC environment variable determines which paging space allocation algorithm is used: deferred or early.
AIX® uses two modes for paging space allocation. The default is deferred. You can switch to an early paging space allocation mode by changing the value of the PSALLOC environment variable, but there are several factors to consider before making such a change. When using the early allocation algorithm, in a worst-case scenario, it is possible to crash the system by using up all available paging space.